[Elecraft] K2 RF Output...SOLVED

[jerry]

Well, that was easy.

   With the help of Don w3fpr, of course.

   Turns out that the internal wattmeter in the KPA100 was giving bad 
info to the
K2.  It was reporting about half the actual wattage.  A quick tweak of 
R26 ( and R27 to match ) fixed it up.


  - Jerry KF6VB



On 2021-08-12 11:00, jerry wrote:
So - I figured - if something on the KPA100 is drawing excess current, 
and not

really doing anything with it, it must be making heat, right?

   I powered up the radio through the barrel connector, left the
KPA100 connected,
set it to "tune" at minimum power and just left it for a while.  Then
felt around.
Then poked around with an infrared thermometer.

   Zilch.  Nothing anywhere is getting hot to trot.  Nor can I find
any hot spots
on the heat sink.

 - Jerry KF6VB


On 2021-08-12 10:22, jerry wrote:

On 2021-08-08 09:49, Don Wilhelm wrote:

Jerry,

Replace diodes D16 and D17 in the KPA100 wattmeter, and things should
settle down.


*** The diodes came in from Mouser yesterday, and I replaced them.  
Things
are still not right.  I did get a good adjustment on C1, and it now 
reads 1 to 1

on all bands.

   HOWEVER, it still will not give full power. It fails with "HiCUR".

  If the KPA100 is installed but not powered up ( power from the
barrel connector ),
it gets to about 8W then fails "HiCUR".

  If the KPA100 is installed AND powered up AND enabled via the menu:
   on 40M, it gets to a bit over 80W, then says "HiCUR".
   on 20M it gets to about 65W, then "HiCUR"

  If I uninstall the KP100 completely, the radio gives full power - 
15.3W on

20M, 16.7W on 40M.

  Very mystifying.  I made up a cord to connect the barrel connector
to my lab supply.
Interesting results:  with the KPA100 connected but power through the
barrel, the radio
simply does draw enough current to shut it down with "HiCUR" at 8W.
It shuts down at
EXACTLY 3.5A measured by the power supply.

  With the KPA100 entirely disconnected, the radio makes 16W on 40M at 
3.15A.


  So my conclusion is that something in the KPA100 is drawing excess
current, in transmit mode, even though the KPA100 is mostly not
operating.

   In "tune" with the power all the way down, and the KPA100
connected, the radio draws
750mA through the barrel connector.

   In "tune" with the power all the way down, and the KPA100
DISCONNECTED, the radio
draws 440mA through the barrel connector.

 - Jerry KF6VB











If you attempted to adjust KPA100 C1 while this condition was 
present,

balance the wattmeter again, it will change with good diodes
installed.
The diodes are 1N5711 type.

That wattmeter is still used as long as the KPA100 is installed on 
the

base K2 - reducing the power to less than 12 watts does not take it
out of line.

CAL CUR should be set at 3.5 amperes with the KPA100 installed. That
(and the current display) is the current drawn by only the base K2,
and not to the KPA100.

73,
Don W3FPR

On 8/8/2021 12:24 PM, jerry wrote:

All,

  My new QRO K2 behaves a little strangely...

On Tune - it makes 108W on 40M, very nice.

But on 20M it behaves strangely.  It won't make more than 20W or so, 
complains about high SWR. Even though my Heathkit HM-102 
SWR/Wattmeter says the SWR is zilch.


So I moved it to a dummy load.  As I turn the power up, it makes up 
to about 80W, and then says "Hi CURR".  And it claims that the dummy 
load ( an 800W "Florida RF" resistor bolted to a large heatsink ) is 
1.6 to 1, which is totally bogus.


OK, there's a null trimmer for the SWR bridge.  I got it down to 
1-to-1 SWR on 20M.  It degrades on higher bands though - up to 1.5 
to 1 on 10M.


Now, 20M gives me a max of 45W - above that it complains "HI CUR".  
It's doing that on all bands.  With the PA off via menu, I get a 
maximum of about 8.5W before getting the "HI CUR" message. I tried 
setting the current up a little bit on the CAL CUR menu, but no real 
difference.


  With a clamp-on DC ammeter ( which I don't trust THAT much ) I see 
340mA on receive,
and just about 3.6A when the display goes "HI CUR".  This is with 
the PA turned off.  The
display shows 7W just before this happens.  Hmm, 13.8V times 3.5A 
means 48.3W DC input.  Seems a little excessive.

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Re: [Elecraft] K2 RF Output

[jerry]

So - I figured - if something on the KPA100 is drawing excess current, 
and not

really doing anything with it, it must be making heat, right?

   I powered up the radio through the barrel connector, left the KPA100 
connected,
set it to "tune" at minimum power and just left it for a while.  Then 
felt around.

Then poked around with an infrared thermometer.

   Zilch.  Nothing anywhere is getting hot to trot.  Nor can I find any 
hot spots

on the heat sink.

 - Jerry KF6VB


On 2021-08-12 10:22, jerry wrote:

On 2021-08-08 09:49, Don Wilhelm wrote:

Jerry,

Replace diodes D16 and D17 in the KPA100 wattmeter, and things should
settle down.


*** The diodes came in from Mouser yesterday, and I replaced them.  
Things
are still not right.  I did get a good adjustment on C1, and it now 
reads 1 to 1

on all bands.

   HOWEVER, it still will not give full power. It fails with "HiCUR".

  If the KPA100 is installed but not powered up ( power from the
barrel connector ),
it gets to about 8W then fails "HiCUR".

  If the KPA100 is installed AND powered up AND enabled via the menu:
   on 40M, it gets to a bit over 80W, then says "HiCUR".
   on 20M it gets to about 65W, then "HiCUR"

  If I uninstall the KP100 completely, the radio gives full power - 
15.3W on

20M, 16.7W on 40M.

  Very mystifying.  I made up a cord to connect the barrel connector
to my lab supply.
Interesting results:  with the KPA100 connected but power through the
barrel, the radio
simply does draw enough current to shut it down with "HiCUR" at 8W.
It shuts down at
EXACTLY 3.5A measured by the power supply.

  With the KPA100 entirely disconnected, the radio makes 16W on 40M at 
3.15A.


  So my conclusion is that something in the KPA100 is drawing excess
current, in transmit mode, even though the KPA100 is mostly not
operating.

   In "tune" with the power all the way down, and the KPA100
connected, the radio draws
750mA through the barrel connector.

   In "tune" with the power all the way down, and the KPA100
DISCONNECTED, the radio
draws 440mA through the barrel connector.

 - Jerry KF6VB












If you attempted to adjust KPA100 C1 while this condition was present,
balance the wattmeter again, it will change with good diodes
installed.
The diodes are 1N5711 type.

That wattmeter is still used as long as the KPA100 is installed on the
base K2 - reducing the power to less than 12 watts does not take it
out of line.

CAL CUR should be set at 3.5 amperes with the KPA100 installed. That
(and the current display) is the current drawn by only the base K2,
and not to the KPA100.

73,
Don W3FPR

On 8/8/2021 12:24 PM, jerry wrote:

All,

  My new QRO K2 behaves a little strangely...

On Tune - it makes 108W on 40M, very nice.

But on 20M it behaves strangely.  It won't make more than 20W or so, 
complains about high SWR. Even though my Heathkit HM-102 
SWR/Wattmeter says the SWR is zilch.


So I moved it to a dummy load.  As I turn the power up, it makes up 
to about 80W, and then says "Hi CURR".  And it claims that the dummy 
load ( an 800W "Florida RF" resistor bolted to a large heatsink ) is 
1.6 to 1, which is totally bogus.


OK, there's a null trimmer for the SWR bridge.  I got it down to 
1-to-1 SWR on 20M.  It degrades on higher bands though - up to 1.5 to 
1 on 10M.


Now, 20M gives me a max of 45W - above that it complains "HI CUR".  
It's doing that on all bands.  With the PA off via menu, I get a 
maximum of about 8.5W before getting the "HI CUR" message. I tried 
setting the current up a little bit on the CAL CUR menu, but no real 
difference.


  With a clamp-on DC ammeter ( which I don't trust THAT much ) I see 
340mA on receive,
and just about 3.6A when the display goes "HI CUR".  This is with the 
PA turned off.  The
display shows 7W just before this happens.  Hmm, 13.8V times 3.5A 
means 48.3W DC input.  Seems a little excessive.

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Re: [Elecraft] K2 RF Output

[Don Wilhelm]

Jerry,

Are you measuring the power output with an external wattmeter?  Or are 
you depending on the power setting in the base K2.  Use an external 
wattmeter while troubleshooting this problem and a dummy load (not an 
antenna) connected to the wattmeter.


The K2 power will fold back when the CAL CUR point is reached.  I still 
say it is a wattmeter problem because that is the normal problem.


Leave the KPA100 connected, and place it 'on its back' on a box or book 
about 1/2 the height of the K2.  Remove the shield and get out your DMM.


When you have done that, send me an email off-reflector (direct email 
and take {Elecraft}  out of the subject line.
The troubleshooting details are not likely of interest to the rest of 
the list.  You can summarize the results to the list when it is resolved.


73,
Don W3FPR

On 8/12/2021 1:22 PM, jerry wrote:

On 2021-08-08 09:49, Don Wilhelm wrote:

Jerry,

Replace diodes D16 and D17 in the KPA100 wattmeter, and things should
settle down.


*** The diodes came in from Mouser yesterday, and I replaced them.  
Things
are still not right.  I did get a good adjustment on C1, and it now 
reads 1 to 1

on all bands.

   HOWEVER, it still will not give full power. It fails with "HiCUR".

  If the KPA100 is installed but not powered up ( power from the 
barrel connector ),

it gets to about 8W then fails "HiCUR".

  If the KPA100 is installed AND powered up AND enabled via the menu:
   on 40M, it gets to a bit over 80W, then says "HiCUR".
   on 20M it gets to about 65W, then "HiCUR"

  If I uninstall the KP100 completely, the radio gives full power - 
15.3W on

20M, 16.7W on 40M.

  Very mystifying.  I made up a cord to connect the barrel connector 
to my lab supply.
Interesting results:  with the KPA100 connected but power through the 
barrel, the radio
simply does draw enough current to shut it down with "HiCUR" at 8W.  
It shuts down at

EXACTLY 3.5A measured by the power supply.

  With the KPA100 entirely disconnected, the radio makes 16W on 40M at 
3.15A.


  So my conclusion is that something in the KPA100 is drawing excess 
current, in transmit mode, even though the KPA100 is mostly not 
operating.


   In "tune" with the power all the way down, and the KPA100 
connected, the radio draws

750mA through the barrel connector.

   In "tune" with the power all the way down, and the KPA100 
DISCONNECTED, the radio

draws 440mA through the barrel connector.

 - Jerry KF6VB













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Re: [Elecraft] K2 RF Output

[jerry]

On 2021-08-08 09:49, Don Wilhelm wrote:

Jerry,

Replace diodes D16 and D17 in the KPA100 wattmeter, and things should
settle down.


*** The diodes came in from Mouser yesterday, and I replaced them.  
Things
are still not right.  I did get a good adjustment on C1, and it now 
reads 1 to 1

on all bands.

   HOWEVER, it still will not give full power. It fails with "HiCUR".

  If the KPA100 is installed but not powered up ( power from the barrel 
connector ),

it gets to about 8W then fails "HiCUR".

  If the KPA100 is installed AND powered up AND enabled via the menu:
   on 40M, it gets to a bit over 80W, then says "HiCUR".
   on 20M it gets to about 65W, then "HiCUR"

  If I uninstall the KP100 completely, the radio gives full power - 
15.3W on

20M, 16.7W on 40M.

  Very mystifying.  I made up a cord to connect the barrel connector to 
my lab supply.
Interesting results:  with the KPA100 connected but power through the 
barrel, the radio
simply does draw enough current to shut it down with "HiCUR" at 8W.  It 
shuts down at

EXACTLY 3.5A measured by the power supply.

  With the KPA100 entirely disconnected, the radio makes 16W on 40M at 
3.15A.


  So my conclusion is that something in the KPA100 is drawing excess 
current, in transmit mode, even though the KPA100 is mostly not 
operating.


   In "tune" with the power all the way down, and the KPA100 connected, 
the radio draws

750mA through the barrel connector.

   In "tune" with the power all the way down, and the KPA100 
DISCONNECTED, the radio

draws 440mA through the barrel connector.

 - Jerry KF6VB












If you attempted to adjust KPA100 C1 while this condition was present,
balance the wattmeter again, it will change with good diodes
installed.
The diodes are 1N5711 type.

That wattmeter is still used as long as the KPA100 is installed on the
base K2 - reducing the power to less than 12 watts does not take it
out of line.

CAL CUR should be set at 3.5 amperes with the KPA100 installed. That
(and the current display) is the current drawn by only the base K2,
and not to the KPA100.

73,
Don W3FPR

On 8/8/2021 12:24 PM, jerry wrote:

All,

  My new QRO K2 behaves a little strangely...

On Tune - it makes 108W on 40M, very nice.

But on 20M it behaves strangely.  It won't make more than 20W or so, 
complains about high SWR. Even though my Heathkit HM-102 SWR/Wattmeter 
says the SWR is zilch.


So I moved it to a dummy load.  As I turn the power up, it makes up to 
about 80W, and then says "Hi CURR".  And it claims that the dummy load 
( an 800W "Florida RF" resistor bolted to a large heatsink ) is 1.6 to 
1, which is totally bogus.


OK, there's a null trimmer for the SWR bridge.  I got it down to 
1-to-1 SWR on 20M.  It degrades on higher bands though - up to 1.5 to 
1 on 10M.


Now, 20M gives me a max of 45W - above that it complains "HI CUR".  
It's doing that on all bands.  With the PA off via menu, I get a 
maximum of about 8.5W before getting the "HI CUR" message. I tried 
setting the current up a little bit on the CAL CUR menu, but no real 
difference.


  With a clamp-on DC ammeter ( which I don't trust THAT much ) I see 
340mA on receive,
and just about 3.6A when the display goes "HI CUR".  This is with the 
PA turned off.  The
display shows 7W just before this happens.  Hmm, 13.8V times 3.5A 
means 48.3W DC input.  Seems a little excessive.

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Re: [Elecraft] K2 RF Output

[Frank Krozel]

Oh, 
Don’s the expert, listen to him

-73-  FrankKG9H
kg9hfr...@gmail.com




> On Aug 8, 2021, at 1:07 PM, Don Wilhelm  wrote:
> 
> That won't work - the KPA100 must be physically removed to keep the base K2 
> from using the KPA100 wattmeter.
> 
> 73,
> Don W3FPR
> 
> On 8/8/2021 1:54 PM, Frank Krozel wrote:
>> Just power the radio, not the PA
>> -73-  FrankKG9H
>> kg9hfr...@gmail.com 
>> 
>> 
>> 
>> 
>>> On Aug 8, 2021, at 12:16 PM, jerry mailto:je...@tr2.com>> 
>>> wrote:
>>> 
>>> All,
>>> 
>>>   Can I just remove the KPA100 and test the K2 "bare" for current draw?
>>> 
>>> - Jerry KF6VB
>>> 
>>> 
>>> On 2021-08-08 09:49, Don Wilhelm wrote:
 Jerry,
 Replace diodes D16 and D17 in the KPA100 wattmeter, and things should
 settle down.
 If you attempted to adjust KPA100 C1 while this condition was present,
 balance the wattmeter again, it will change with good diodes
 installed.
 The diodes are 1N5711 type.
 That wattmeter is still used as long as the KPA100 is installed on the
 base K2 - reducing the power to less than 12 watts does not take it
 out of line.
 CAL CUR should be set at 3.5 amperes with the KPA100 installed. That
 (and the current display) is the current drawn by only the base K2,
 and not to the KPA100.
 73,
 Don W3FPR
 On 8/8/2021 12:24 PM, jerry wrote:
> All,
>   My new QRO K2 behaves a little strangely...
> On Tune - it makes 108W on 40M, very nice.
> But on 20M it behaves strangely.  It won't make more than 20W or so, 
> complains about high SWR. Even though my Heathkit HM-102 SWR/Wattmeter 
> says the SWR is zilch.
> So I moved it to a dummy load.  As I turn the power up, it makes up to 
> about 80W, and then says "Hi CURR".  And it claims that the dummy load ( 
> an 800W "Florida RF" resistor bolted to a large heatsink ) is 1.6 to 1, 
> which is totally bogus.
> OK, there's a null trimmer for the SWR bridge.  I got it down to 1-to-1 
> SWR on 20M.  It degrades on higher bands though - up to 1.5 to 1 on 10M.
> Now, 20M gives me a max of 45W - above that it complains "HI CUR".  It's 
> doing that on all bands. With the PA off via menu, I get a maximum of 
> about 8.5W before getting the "HI CUR" message. I tried setting the 
> current up a little bit on the CAL CUR menu, but no real difference.
>   With a clamp-on DC ammeter ( which I don't trust THAT much ) I see 
> 340mA on receive,
> and just about 3.6A when the display goes "HI CUR". This is with the PA 
> turned off.  The
> display shows 7W just before this happens.  Hmm, 13.8V times 3.5A means 
> 48.3W DC input.  Seems a little excessive.
>>> __
>>> Elecraft mailing list
>>> Home: http://mailman.qth.net/mailman/listinfo/elecraft 
>>> 
>>> Help: http://mailman.qth.net/mmfaq.htm 
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>>> 
>>> Message delivered to kg9hfr...@gmail.com 
>> 
> 

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Re: [Elecraft] K2 RF Output

[Don Wilhelm]

That won't work - the KPA100 must be physically removed to keep the base 
K2 from using the KPA100 wattmeter.


73,
Don W3FPR

On 8/8/2021 1:54 PM, Frank Krozel wrote:

Just power the radio, not the PA
-73-  Frank    KG9H
kg9hfr...@gmail.com 




On Aug 8, 2021, at 12:16 PM, jerry > wrote:


All,

  Can I just remove the KPA100 and test the K2 "bare" for current draw?

- Jerry KF6VB


On 2021-08-08 09:49, Don Wilhelm wrote:

Jerry,
Replace diodes D16 and D17 in the KPA100 wattmeter, and things should
settle down.
If you attempted to adjust KPA100 C1 while this condition was present,
balance the wattmeter again, it will change with good diodes
installed.
The diodes are 1N5711 type.
That wattmeter is still used as long as the KPA100 is installed on the
base K2 - reducing the power to less than 12 watts does not take it
out of line.
CAL CUR should be set at 3.5 amperes with the KPA100 installed. That
(and the current display) is the current drawn by only the base K2,
and not to the KPA100.
73,
Don W3FPR
On 8/8/2021 12:24 PM, jerry wrote:

All,
  My new QRO K2 behaves a little strangely...
On Tune - it makes 108W on 40M, very nice.
But on 20M it behaves strangely.  It won't make more than 20W or 
so, complains about high SWR. Even though my Heathkit HM-102 
SWR/Wattmeter says the SWR is zilch.
So I moved it to a dummy load.  As I turn the power up, it makes up 
to about 80W, and then says "Hi CURR".  And it claims that the 
dummy load ( an 800W "Florida RF" resistor bolted to a large 
heatsink ) is 1.6 to 1, which is totally bogus.
OK, there's a null trimmer for the SWR bridge.  I got it down to 
1-to-1 SWR on 20M.  It degrades on higher bands though - up to 1.5 
to 1 on 10M.
Now, 20M gives me a max of 45W - above that it complains "HI CUR".  
It's doing that on all bands. With the PA off via menu, I get a 
maximum of about 8.5W before getting the "HI CUR" message. I tried 
setting the current up a little bit on the CAL CUR menu, but no 
real difference.
  With a clamp-on DC ammeter ( which I don't trust THAT much ) I 
see 340mA on receive,
and just about 3.6A when the display goes "HI CUR". This is with 
the PA turned off.  The
display shows 7W just before this happens.  Hmm, 13.8V times 3.5A 
means 48.3W DC input.  Seems a little excessive.

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Re: [Elecraft] K2 RF Output

[Frank Krozel]

Just power the radio, not the PA
-73-  FrankKG9H
kg9hfr...@gmail.com




> On Aug 8, 2021, at 12:16 PM, jerry  wrote:
> 
> All,
> 
>   Can I just remove the KPA100 and test the K2 "bare" for current draw?
> 
> - Jerry KF6VB
> 
> 
> On 2021-08-08 09:49, Don Wilhelm wrote:
>> Jerry,
>> Replace diodes D16 and D17 in the KPA100 wattmeter, and things should
>> settle down.
>> If you attempted to adjust KPA100 C1 while this condition was present,
>> balance the wattmeter again, it will change with good diodes
>> installed.
>> The diodes are 1N5711 type.
>> That wattmeter is still used as long as the KPA100 is installed on the
>> base K2 - reducing the power to less than 12 watts does not take it
>> out of line.
>> CAL CUR should be set at 3.5 amperes with the KPA100 installed. That
>> (and the current display) is the current drawn by only the base K2,
>> and not to the KPA100.
>> 73,
>> Don W3FPR
>> On 8/8/2021 12:24 PM, jerry wrote:
>>> All,
>>>   My new QRO K2 behaves a little strangely...
>>> On Tune - it makes 108W on 40M, very nice.
>>> But on 20M it behaves strangely.  It won't make more than 20W or so, 
>>> complains about high SWR. Even though my Heathkit HM-102 SWR/Wattmeter says 
>>> the SWR is zilch.
>>> So I moved it to a dummy load.  As I turn the power up, it makes up to 
>>> about 80W, and then says "Hi CURR".  And it claims that the dummy load ( an 
>>> 800W "Florida RF" resistor bolted to a large heatsink ) is 1.6 to 1, which 
>>> is totally bogus.
>>> OK, there's a null trimmer for the SWR bridge.  I got it down to 1-to-1 SWR 
>>> on 20M.  It degrades on higher bands though - up to 1.5 to 1 on 10M.
>>> Now, 20M gives me a max of 45W - above that it complains "HI CUR".  It's 
>>> doing that on all bands.  With the PA off via menu, I get a maximum of 
>>> about 8.5W before getting the "HI CUR" message. I tried setting the current 
>>> up a little bit on the CAL CUR menu, but no real difference.
>>>   With a clamp-on DC ammeter ( which I don't trust THAT much ) I see 340mA 
>>> on receive,
>>> and just about 3.6A when the display goes "HI CUR".  This is with the PA 
>>> turned off.  The
>>> display shows 7W just before this happens.  Hmm, 13.8V times 3.5A means 
>>> 48.3W DC input.  Seems a little excessive.
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Re: [Elecraft] K2 RF Output

[jerry]

All,

   Can I just remove the KPA100 and test the K2 "bare" for current draw?

 - Jerry KF6VB


On 2021-08-08 09:49, Don Wilhelm wrote:

Jerry,

Replace diodes D16 and D17 in the KPA100 wattmeter, and things should
settle down.
If you attempted to adjust KPA100 C1 while this condition was present,
balance the wattmeter again, it will change with good diodes
installed.
The diodes are 1N5711 type.

That wattmeter is still used as long as the KPA100 is installed on the
base K2 - reducing the power to less than 12 watts does not take it
out of line.

CAL CUR should be set at 3.5 amperes with the KPA100 installed. That
(and the current display) is the current drawn by only the base K2,
and not to the KPA100.

73,
Don W3FPR

On 8/8/2021 12:24 PM, jerry wrote:

All,

  My new QRO K2 behaves a little strangely...

On Tune - it makes 108W on 40M, very nice.

But on 20M it behaves strangely.  It won't make more than 20W or so, 
complains about high SWR. Even though my Heathkit HM-102 SWR/Wattmeter 
says the SWR is zilch.


So I moved it to a dummy load.  As I turn the power up, it makes up to 
about 80W, and then says "Hi CURR".  And it claims that the dummy load 
( an 800W "Florida RF" resistor bolted to a large heatsink ) is 1.6 to 
1, which is totally bogus.


OK, there's a null trimmer for the SWR bridge.  I got it down to 
1-to-1 SWR on 20M.  It degrades on higher bands though - up to 1.5 to 
1 on 10M.


Now, 20M gives me a max of 45W - above that it complains "HI CUR".  
It's doing that on all bands.  With the PA off via menu, I get a 
maximum of about 8.5W before getting the "HI CUR" message. I tried 
setting the current up a little bit on the CAL CUR menu, but no real 
difference.


  With a clamp-on DC ammeter ( which I don't trust THAT much ) I see 
340mA on receive,
and just about 3.6A when the display goes "HI CUR".  This is with the 
PA turned off.  The
display shows 7W just before this happens.  Hmm, 13.8V times 3.5A 
means 48.3W DC input.  Seems a little excessive.

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Re: [Elecraft] K2 RF Output

[Don Wilhelm]

Jerry,

Replace diodes D16 and D17 in the KPA100 wattmeter, and things should 
settle down.
If you attempted to adjust KPA100 C1 while this condition was present, 
balance the wattmeter again, it will change with good diodes installed.

The diodes are 1N5711 type.

That wattmeter is still used as long as the KPA100 is installed on the 
base K2 - reducing the power to less than 12 watts does not take it out 
of line.


CAL CUR should be set at 3.5 amperes with the KPA100 installed. That 
(and the current display) is the current drawn by only the base K2, and 
not to the KPA100.


73,
Don W3FPR

On 8/8/2021 12:24 PM, jerry wrote:

All,

  My new QRO K2 behaves a little strangely...

On Tune - it makes 108W on 40M, very nice.

But on 20M it behaves strangely.  It won't make more than 20W or so, 
complains about high SWR. Even though my Heathkit HM-102 SWR/Wattmeter 
says the SWR is zilch.


So I moved it to a dummy load.  As I turn the power up, it makes up to 
about 80W, and then says "Hi CURR".  And it claims that the dummy load 
( an 800W "Florida RF" resistor bolted to a large heatsink ) is 1.6 to 
1, which is totally bogus.


OK, there's a null trimmer for the SWR bridge.  I got it down to 
1-to-1 SWR on 20M.  It degrades on higher bands though - up to 1.5 to 
1 on 10M.


Now, 20M gives me a max of 45W - above that it complains "HI CUR".  
It's doing that on all bands.  With the PA off via menu, I get a 
maximum of about 8.5W before getting the "HI CUR" message. I tried 
setting the current up a little bit on the CAL CUR menu, but no real 
difference.


  With a clamp-on DC ammeter ( which I don't trust THAT much ) I see 
340mA on receive,
and just about 3.6A when the display goes "HI CUR".  This is with the 
PA turned off.  The
display shows 7W just before this happens.  Hmm, 13.8V times 3.5A 
means 48.3W DC input.  Seems a little excessive.


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[Elecraft] K2 RF Output

[jerry]

All,

  My new QRO K2 behaves a little strangely...

On Tune - it makes 108W on 40M, very nice.

But on 20M it behaves strangely.  It won't make more than 20W or so, 
complains about high SWR. Even though my Heathkit HM-102 SWR/Wattmeter 
says the SWR is zilch.


So I moved it to a dummy load.  As I turn the power up, it makes up to 
about 80W, and then says "Hi CURR".  And it claims that the dummy load ( 
an 800W "Florida RF" resistor bolted to a large heatsink ) is 1.6 to 1, 
which is totally bogus.


OK, there's a null trimmer for the SWR bridge.  I got it down to 1-to-1 
SWR on 20M.  It degrades on higher bands though - up to 1.5 to 1 on 10M.


Now, 20M gives me a max of 45W - above that it complains "HI CUR".  It's 
doing that on all bands.  With the PA off via menu, I get a maximum of 
about 8.5W before getting the "HI CUR" message.  I tried setting the 
current up a little bit on the CAL CUR menu, but no real difference.


  With a clamp-on DC ammeter ( which I don't trust THAT much ) I see 
340mA on receive,
and just about 3.6A when the display goes "HI CUR".  This is with the PA 
turned off.  The
display shows 7W just before this happens.  Hmm, 13.8V times 3.5A means 
48.3W DC input.  Seems a little excessive.


 - Jerry KF6VB






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Re: [Elecraft] K2 audio output question

[Chuck Chandler]

Thanks for the tip!

73 de Chuck, WS1L

chandler...@gmail.com


On Mon, Jan 4, 2021 at 12:35 PM Geert Jan de Groot  wrote:

> On 04/01/2021 04:13, elecraft-requ...@mailman.qth.net wrote:
> > Is there a way to have both headphones and external speaker active at the
> > same time?  I'm thinking of being able to have audio for visitors while
> > still using headphones to copy.
>
> In addition to Don's response, you may want to look at this:
> https://www.w8fgu.com/pics/k2faob/w3fpr_K2%20audio%20Fix.pdf
> http://www.w3fpr.com/download_files/FP-CB%20mounting%20photos.pdf
>
> I have done this, using a piece of perfboard.
> To avoid shorts, in my case the PCB is in a piece of heat shrink tube.
>
> If you want a kit, check out https://www.w8fgu.com/k2_fixedaudio.html
>
> Instead of perfboarding it, I should have bought a kit from Dave, but
> sending a parcel by mail to PA0 would need me to mortgage my house, not
> to mention a lot of patience (another PCB ordered recently was stuck for
> *nine months* in Chicago).
>
> The advantage is that the 2nd output is fixed audio volume, so you can
> adjust the speaker audio and the headset audio separately.
>
> In my case (connecting multiple headsets on the speaker output) this
> approach has another advantage: I added audio sidetone to my K2 so that
> the people using headphones can hear eachother speak, yet the
> fixed-audio output doesn't have this, so there is no feedback from the
> speaker.
>
> When you use a speaker, make sure you use one that works well for SSB
> audio. For visitors, I would consider making some headsets available
> instead. SSB-via-speaker is more difficult to decode, SSB-via-speaker
> for people without SSB ears will just result in "there was a guy playing
> radio noise" at the exhibition.
>
> 73,
>
> Geert Jan PE1HZG
>
>
>
>
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Re: [Elecraft] K2 audio output question

[Geert Jan de Groot]

On 04/01/2021 04:13, elecraft-requ...@mailman.qth.net wrote:

Is there a way to have both headphones and external speaker active at the
same time?  I'm thinking of being able to have audio for visitors while
still using headphones to copy.


In addition to Don's response, you may want to look at this:
https://www.w8fgu.com/pics/k2faob/w3fpr_K2%20audio%20Fix.pdf
http://www.w3fpr.com/download_files/FP-CB%20mounting%20photos.pdf

I have done this, using a piece of perfboard.
To avoid shorts, in my case the PCB is in a piece of heat shrink tube.

If you want a kit, check out https://www.w8fgu.com/k2_fixedaudio.html

Instead of perfboarding it, I should have bought a kit from Dave, but 
sending a parcel by mail to PA0 would need me to mortgage my house, not 
to mention a lot of patience (another PCB ordered recently was stuck for 
*nine months* in Chicago).


The advantage is that the 2nd output is fixed audio volume, so you can 
adjust the speaker audio and the headset audio separately.


In my case (connecting multiple headsets on the speaker output) this 
approach has another advantage: I added audio sidetone to my K2 so that 
the people using headphones can hear eachother speak, yet the 
fixed-audio output doesn't have this, so there is no feedback from the 
speaker.


When you use a speaker, make sure you use one that works well for SSB 
audio. For visitors, I would consider making some headsets available 
instead. SSB-via-speaker is more difficult to decode, SSB-via-speaker 
for people without SSB ears will just result in "there was a guy playing 
radio noise" at the exhibition.


73,

Geert Jan PE1HZG



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Re: [Elecraft] K2 audio output question

[Walter Underwood]

My KX3 only has a Phones output and that won’t drive speakers well, so I use an 
off-the-shelf headphone splitter and a cheap audio amp that runs off 12 V. The 
details are here.

https://observer.wunderwood.org/2017/03/04/speakers-for-my-elecraft-kx3/ 


It looks like that particular audio amp isn’t available now, but there are 
plenty of similar cheap ones on Amazon.

wunder
K6WRU
Walter Underwood
CM87wj
http://observer.wunderwood.org/ (my blog)

> On Jan 3, 2021, at 10:26 AM, Don Wilhelm  wrote:
> 
> Chuck,
> 
> Yes, you can do that by soldering a jumper across the switch at the rear of 
> the headphone jack.
> If you prefer not to add the jumper, plug stereo computer speakers into the 
> headphone jack and plug your headphones into the headphone jack on the 
> speaker.
> Try different computer speakers, some mute the speakers when headphones are 
> plugged in, others do not.
> 
> 73,
> Don W3FPR
> 
> On 1/3/2021 12:58 PM, Chuck Chandler wrote:
>> I've recently begun volunteering aboard the museum ship USS Slater, where
>> they have a K2 in Radio Central.  I've looked through the manual, but might
>> have overlooked this.
>> Is there a way to have both headphones and external speaker active at the
>> same time?  I'm thinking of being able to have audio for visitors while
>> still using headphones to copy.
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Re: [Elecraft] K2 audio output question

[Don Wilhelm]

Chuck,

Yes, you can do that by soldering a jumper across the switch at the rear 
of the headphone jack.
If you prefer not to add the jumper, plug stereo computer speakers into 
the headphone jack and plug your headphones into the headphone jack on 
the speaker.
Try different computer speakers, some mute the speakers when headphones 
are plugged in, others do not.


73,
Don W3FPR

On 1/3/2021 12:58 PM, Chuck Chandler wrote:

I've recently begun volunteering aboard the museum ship USS Slater, where
they have a K2 in Radio Central.  I've looked through the manual, but might
have overlooked this.

Is there a way to have both headphones and external speaker active at the
same time?  I'm thinking of being able to have audio for visitors while
still using headphones to copy.


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[Elecraft] K2 audio output question

[Chuck Chandler]

I've recently begun volunteering aboard the museum ship USS Slater, where
they have a K2 in Radio Central.  I've looked through the manual, but might
have overlooked this.

Is there a way to have both headphones and external speaker active at the
same time?  I'm thinking of being able to have audio for visitors while
still using headphones to copy.

Thanks,

73 de Chuck, WS1L

chandler...@gmail.com
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[Elecraft] K2 IF Output Adapter from QRP-Shop K2 ZF Adapter

[Harry Yingst via Elecraft]

My K2 ZF Adapter came in from QRP-Shop
http://www.qrp-shop.biz/epages/qrp-shop.sf/en_GB/?ViewObjectPath=%2FShops%2Fqrp-shop%2FProducts%2FVk2zfadapter


The manual is in German but they taped each component to a picture of the board 
layout so it make it simple to assemble.
The Kit with shipping to the US was about $20

Just passing along the info in case someone is looking for one.


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Re: [Elecraft] K2 IF output

[Harry Yingst via Elecraft]

Thank you
I ran it through Google translator
Not much info needed other than build it as per the diagram



  From: Heinz Bärtschi <heinz.baerts...@bluewin.ch>
 To: Harry Yingst <hlyin...@yahoo.com> 
Cc: Elecraft Reflector <elecraft@mailman.qth.net>
 Sent: Tuesday, February 14, 2017 4:54 PM
 Subject: Re: [Elecraft] K2 IF output
   

> Am 14.02.2017 um 22:07 schrieb Harry Yingst via Elecraft 
> <elecraft@mailman.qth.net>:
> 
> I hope the instructions are in English
> Else I need to go Visit my mother to translate

However, it does not seem to be a labyrinth, hi.
http://dd2nu.my1.cc/ZF_AdapterK2.pdf

Have fun!
73, Heinz HB9BCB


   
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Re: [Elecraft] K2 IF output

[Heinz Bärtschi]

> Am 14.02.2017 um 22:07 schrieb Harry Yingst via Elecraft 
> :
> 
> I hope the instructions are in English
> Else I need to go Visit my mother to translate

However, it does not seem to be a labyrinth, hi.
http://dd2nu.my1.cc/ZF_AdapterK2.pdf

Have fun!
73, Heinz HB9BCB

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Re: [Elecraft] K2 IF output

[Doug Person]

Thanks! I will certainly order one.

Doug -- K0DXV


On 2/14/2017 1:26 PM, Hajo Dezelski wrote:

Hi Doug,

it works without any problems since ... I don't remember when.
But you can also buy this board with all SMT parts already soldered.
http://www.qrp-shop.biz/epages/qrp-shop.sf/de_DE/?ObjectPath=/Shops/qrp-shop/Products/Vk2zfadapterBest%C3%BCckt

73 de
Hajo dl1sdz

---
Cela est bien dit, mais il faut cultiver notre jardin.

http://hajos-kontrapunkte.blogspot.de/


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Re: [Elecraft] K2 IF output

[Harry Yingst via Elecraft]

I hope the instructions are in English
Else I need to go Visit my mother to translate



  From: Hajo Dezelski <dl1...@gmail.com>
 To: Doug Person <d...@k0dxv.com> 
Cc: Elecraft Reflector <elecraft@mailman.qth.net>
 Sent: Tuesday, February 14, 2017 3:26 PM
 Subject: Re: [Elecraft] K2 IF output
   
Hi Doug,

it works without any problems since ... I don't remember when.
But you can also buy this board with all SMT parts already soldered.
http://www.qrp-shop.biz/epages/qrp-shop.sf/de_DE/?ObjectPath=/Shops/qrp-shop/Products/Vk2zfadapterBest%C3%BCckt

73 de
Hajo dl1sdz

---
Cela est bien dit, mais il faut cultiver notre jardin.

http://hajos-kontrapunkte.blogspot.de/
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Re: [Elecraft] K2 IF output

[Hajo Dezelski]

Hi Doug,

it works without any problems since ... I don't remember when.
But you can also buy this board with all SMT parts already soldered.
http://www.qrp-shop.biz/epages/qrp-shop.sf/de_DE/?ObjectPath=/Shops/qrp-shop/Products/Vk2zfadapterBest%C3%BCckt

73 de
Hajo dl1sdz

---
Cela est bien dit, mais il faut cultiver notre jardin.

http://hajos-kontrapunkte.blogspot.de/
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Re: [Elecraft] K2 IF output

[Harry Yingst via Elecraft]

I just ordered one today

You need to register on the site so the pricing shows up correct



  From: Doug Person <d...@k0dxv.com>
 To: elecraft@mailman.qth.net 
 Sent: Tuesday, February 14, 2017 2:49 PM
 Subject: Re: [Elecraft] K2 IF output
   
That's a pretty neat little kit.  Anyone have experience with it?

Doug -- K0DXV


On 2/13/2017 6:41 PM, Don Wilhelm wrote:
> The Clifton Labs Z1B was a general purpose instrumentation 
> amplifier.  One version was specific for the K2 by adding a filter
> The buffer amp at QRP projects is specifically designed for the K2.
> See 
> http://www.qrp-shop.biz/epages/qrp-shop.sf/de_DE/?ObjectPath=/Shops/qrp-shop/Products/Vk2zfadapter.
>
> 73,
> Don W3FPR
>
>
>
> On 2/13/2017 8:22 PM, lmarion wrote:
>>
>> The Cliffton Webb unit was specifically made for K2 exact signal/clean
>> easy physical fit internally,
>> and a external  IF pass band filter for a clean signal no matter what
>> kind of signals
>> are present in your shack.
>> Not a area of your receiver where you want to be hacking about. Just
>> saying.
>>
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Re: [Elecraft] K2 IF output

[Doug Person]

That's a pretty neat little kit.  Anyone have experience with it?

Doug -- K0DXV


On 2/13/2017 6:41 PM, Don Wilhelm wrote:
The Clifton Labs Z1B was a general purpose instrumentation 
amplifier.  One version was specific for the K2 by adding a filter

The buffer amp at QRP projects is specifically designed for the K2.
See 
http://www.qrp-shop.biz/epages/qrp-shop.sf/de_DE/?ObjectPath=/Shops/qrp-shop/Products/Vk2zfadapter.


73,
Don W3FPR



On 2/13/2017 8:22 PM, lmarion wrote:


The Cliffton Webb unit was specifically made for K2 exact signal/clean
easy physical fit internally,
and a external  IF pass band filter for a clean signal no matter what
kind of signals
are present in your shack.
Not a area of your receiver where you want to be hacking about. Just
saying.


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Re: [Elecraft] K2 IF output

[lmarion]

It works perfectly with HSDR that I use and several others, I have never 
used it with LP Pan however.


Leroy AB7CE

-Original Message- 
From: Bob

Sent: Monday, February 13, 2017 10:19 PM
To: Ron D'Eau Claire
Cc: elecraft@mailman.qth.net
Subject: Re: [Elecraft] K2 IF output

Hi Ron,

The filter was a 200kc wide bandpass filter so you would see 
all
the signals of interest.  So may have helped with the input to the LP Pan 
which

was the hot setup back then.

Here:

http://www.cliftonlaboratories.com/K2_Filter.htm

73,
Bob
K2TK  ex KN2TKR (1956) and K2TKR


On 2/14/2017 12:00 AM, lmarion wrote:

I am using it and it works PERFECTLY  on both sides of the signal.
If you want more explanation than I am prepared to provide,
Cliffs site info is still there, just not the products.

73  Leroy AB7CE

-Original Message- From: Ron D'Eau Claire
Sent: Monday, February 13, 2017 8:55 PM
To: 'lmarion' ; 'Heinz Bärtschi' ; 'Ken G Kopp'
Cc: elecraft@mailman.qth.net
Subject: RE: [Elecraft] K2 IF output

If you want to see spectrum on either side of the signal, you do not want 
a filter in the loop. Ideally, you would see the entire spectrum *before* 
any I.F. filtering on the panadapter.


73, Ron AC7AC

-Original Message-
From: Elecraft [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of 
lmarion

Sent: Monday, February 13, 2017 5:22 PM
To: Heinz Bärtschi; Ken G Kopp
Cc: elecraft@mailman.qth.net
Subject: Re: [Elecraft] K2 IF output


The Cliffton Webb unit was specifically made for K2 exact signal/clean 
easy physical fit internally, and a external  IF pass band filter for a 
clean signal no matter what kind of signals are present in your shack.
Not a area of your receiver where you want to be hacking about. Just 
saying.


73  Leroy  AB7CE


-Original Message-
From: Heinz Bärtschi
Sent: Monday, February 13, 2017 11:22 AM
To: Ken G Kopp
Cc: elecraft@mailman.qth.net
Subject: Re: [Elecraft] K2 IF output

That would be an option:

IF Adapter full kit (SMD components):
http://www.qrp-shop.biz/epages/qrp-shop.sf/de_DE/?ObjectPath=/Shops/qrp-shop/Products/Vk2zfadapter

IF Adapter kit (all SMD components soldered):
http://www.qrp-shop.biz/epages/qrp-shop.sf/de_DE/?ObjectPath=/Shops/qrp-shop/Products/Vk2zfadapterBestückt

73, Heinz HB9BCB



Am 13.02.2017 um 18:43 schrieb Ken G Kopp <kengk...@gmail.com>:

Who makes a Clifton Labs Z1000B replacement for the K2?


On Feb 13, 2017 07:46, "Don Wilhelm" <donw...@embarqmail.com> wrote:

Ken,

Sorry, but I do not.
There is a ham in England who produces a buffer amplifier that can be
used, but I cannot recall who.
If you ask on the reflector for a Clifton Labs Z1B replacement,
you may get some hits.

73,
Don W3FPR




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Re: [Elecraft] K2 IF output

[Bob]

Hi Ron,

The filter was a 200kc wide bandpass filter so you would see all 
the signals of interest.  So may have helped with the input to the LP Pan which 
was the hot setup back then.


Here:

http://www.cliftonlaboratories.com/K2_Filter.htm

73,
Bob
K2TK  ex KN2TKR (1956) and K2TKR


On 2/14/2017 12:00 AM, lmarion wrote:

I am using it and it works PERFECTLY  on both sides of the signal.
If you want more explanation than I am prepared to provide,
Cliffs site info is still there, just not the products.

73  Leroy AB7CE

-Original Message- From: Ron D'Eau Claire
Sent: Monday, February 13, 2017 8:55 PM
To: 'lmarion' ; 'Heinz Bärtschi' ; 'Ken G Kopp'
Cc: elecraft@mailman.qth.net
Subject: RE: [Elecraft] K2 IF output

If you want to see spectrum on either side of the signal, you do not want a 
filter in the loop. Ideally, you would see the entire spectrum *before* any 
I.F. filtering on the panadapter.


73, Ron AC7AC

-Original Message-
From: Elecraft [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of lmarion
Sent: Monday, February 13, 2017 5:22 PM
To: Heinz Bärtschi; Ken G Kopp
Cc: elecraft@mailman.qth.net
Subject: Re: [Elecraft] K2 IF output


The Cliffton Webb unit was specifically made for K2 exact signal/clean easy 
physical fit internally, and a external  IF pass band filter for a clean 
signal no matter what kind of signals are present in your shack.

Not a area of your receiver where you want to be hacking about. Just saying.

73  Leroy  AB7CE


-Original Message-
From: Heinz Bärtschi
Sent: Monday, February 13, 2017 11:22 AM
To: Ken G Kopp
Cc: elecraft@mailman.qth.net
Subject: Re: [Elecraft] K2 IF output

That would be an option:

IF Adapter full kit (SMD components):
http://www.qrp-shop.biz/epages/qrp-shop.sf/de_DE/?ObjectPath=/Shops/qrp-shop/Products/Vk2zfadapter 



IF Adapter kit (all SMD components soldered):
http://www.qrp-shop.biz/epages/qrp-shop.sf/de_DE/?ObjectPath=/Shops/qrp-shop/Products/Vk2zfadapterBestückt 



73, Heinz HB9BCB



Am 13.02.2017 um 18:43 schrieb Ken G Kopp <kengk...@gmail.com>:

Who makes a Clifton Labs Z1000B replacement for the K2?


On Feb 13, 2017 07:46, "Don Wilhelm" <donw...@embarqmail.com> wrote:

Ken,

Sorry, but I do not.
There is a ham in England who produces a buffer amplifier that can be
used, but I cannot recall who.
If you ask on the reflector for a Clifton Labs Z1B replacement,
you may get some hits.

73,
Don W3FPR




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Re: [Elecraft] K2 IF output

[lmarion]

I am using it and it works PERFECTLY  on both sides of the signal.
If you want more explanation than I am prepared to provide,
Cliffs site info is still there, just not the products.

73  Leroy AB7CE

-Original Message- 
From: Ron D'Eau Claire

Sent: Monday, February 13, 2017 8:55 PM
To: 'lmarion' ; 'Heinz Bärtschi' ; 'Ken G Kopp'
Cc: elecraft@mailman.qth.net
Subject: RE: [Elecraft] K2 IF output

If you want to see spectrum on either side of the signal, you do not want a 
filter in the loop. Ideally, you would see the entire spectrum *before* any 
I.F. filtering on the panadapter.


73, Ron AC7AC

-Original Message-
From: Elecraft [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of 
lmarion

Sent: Monday, February 13, 2017 5:22 PM
To: Heinz Bärtschi; Ken G Kopp
Cc: elecraft@mailman.qth.net
Subject: Re: [Elecraft] K2 IF output


The Cliffton Webb unit was specifically made for K2 exact signal/clean easy 
physical fit internally, and a external  IF pass band filter for a clean 
signal no matter what kind of signals are present in your shack.

Not a area of your receiver where you want to be hacking about. Just saying.

73  Leroy  AB7CE


-Original Message-
From: Heinz Bärtschi
Sent: Monday, February 13, 2017 11:22 AM
To: Ken G Kopp
Cc: elecraft@mailman.qth.net
Subject: Re: [Elecraft] K2 IF output

That would be an option:

IF Adapter full kit (SMD components):
http://www.qrp-shop.biz/epages/qrp-shop.sf/de_DE/?ObjectPath=/Shops/qrp-shop/Products/Vk2zfadapter

IF Adapter kit (all SMD components soldered):
http://www.qrp-shop.biz/epages/qrp-shop.sf/de_DE/?ObjectPath=/Shops/qrp-shop/Products/Vk2zfadapterBestückt

73, Heinz HB9BCB



Am 13.02.2017 um 18:43 schrieb Ken G Kopp <kengk...@gmail.com>:

Who makes a Clifton Labs Z1000B replacement for the K2?


On Feb 13, 2017 07:46, "Don Wilhelm" <donw...@embarqmail.com> wrote:

Ken,

Sorry, but I do not.
There is a ham in England who produces a buffer amplifier that can be
used, but I cannot recall who.
If you ask on the reflector for a Clifton Labs Z1B replacement,
you may get some hits.

73,
Don W3FPR




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Re: [Elecraft] K2 IF output

[Ron D'Eau Claire]

If you want to see spectrum on either side of the signal, you do not want a 
filter in the loop. Ideally, you would see the entire spectrum *before* any 
I.F. filtering on the panadapter. 

73, Ron AC7AC

-Original Message-
From: Elecraft [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of lmarion
Sent: Monday, February 13, 2017 5:22 PM
To: Heinz Bärtschi; Ken G Kopp
Cc: elecraft@mailman.qth.net
Subject: Re: [Elecraft] K2 IF output


The Cliffton Webb unit was specifically made for K2 exact signal/clean easy 
physical fit internally, and a external  IF pass band filter for a clean signal 
no matter what kind of signals are present in your shack.
Not a area of your receiver where you want to be hacking about. Just saying.

73  Leroy  AB7CE


-Original Message-
From: Heinz Bärtschi
Sent: Monday, February 13, 2017 11:22 AM
To: Ken G Kopp
Cc: elecraft@mailman.qth.net
Subject: Re: [Elecraft] K2 IF output

That would be an option:

IF Adapter full kit (SMD components):
http://www.qrp-shop.biz/epages/qrp-shop.sf/de_DE/?ObjectPath=/Shops/qrp-shop/Products/Vk2zfadapter

IF Adapter kit (all SMD components soldered):
http://www.qrp-shop.biz/epages/qrp-shop.sf/de_DE/?ObjectPath=/Shops/qrp-shop/Products/Vk2zfadapterBestückt

73, Heinz HB9BCB


> Am 13.02.2017 um 18:43 schrieb Ken G Kopp <kengk...@gmail.com>:
>
> Who makes a Clifton Labs Z1000B replacement for the K2?
>
>> On Feb 13, 2017 07:46, "Don Wilhelm" <donw...@embarqmail.com> wrote:
>>
>> Ken,
>>
>> Sorry, but I do not.
>> There is a ham in England who produces a buffer amplifier that can be 
>> used, but I cannot recall who.
>> If you ask on the reflector for a Clifton Labs Z1B replacement, 
>> you may get some hits.
>>
>> 73,
>> Don W3FPR
>>>

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Re: [Elecraft] K2 IF output

[Don Wilhelm]

The Clifton Labs Z1B was a general purpose instrumentation 
amplifier.  One version was specific for the K2 by adding a filter

The buffer amp at QRP projects is specifically designed for the K2.
See 
http://www.qrp-shop.biz/epages/qrp-shop.sf/de_DE/?ObjectPath=/Shops/qrp-shop/Products/Vk2zfadapter.


73,
Don W3FPR



On 2/13/2017 8:22 PM, lmarion wrote:


The Cliffton Webb unit was specifically made for K2 exact signal/clean
easy physical fit internally,
and a external  IF pass band filter for a clean signal no matter what
kind of signals
are present in your shack.
Not a area of your receiver where you want to be hacking about. Just
saying.


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Re: [Elecraft] K2 IF output

[lmarion]

The Cliffton Webb unit was specifically made for K2 exact signal/clean easy 
physical fit internally,
and a external  IF pass band filter for a clean signal no matter what kind 
of signals

are present in your shack.
Not a area of your receiver where you want to be hacking about. Just saying.

73  Leroy  AB7CE


-Original Message- 
From: Heinz Bärtschi

Sent: Monday, February 13, 2017 11:22 AM
To: Ken G Kopp
Cc: elecraft@mailman.qth.net
Subject: Re: [Elecraft] K2 IF output

That would be an option:

IF Adapter full kit (SMD components):
http://www.qrp-shop.biz/epages/qrp-shop.sf/de_DE/?ObjectPath=/Shops/qrp-shop/Products/Vk2zfadapter

IF Adapter kit (all SMD components soldered):
http://www.qrp-shop.biz/epages/qrp-shop.sf/de_DE/?ObjectPath=/Shops/qrp-shop/Products/Vk2zfadapterBestückt

73, Heinz HB9BCB



Am 13.02.2017 um 18:43 schrieb Ken G Kopp <kengk...@gmail.com>:

Who makes a Clifton Labs Z1000B replacement for the K2?


On Feb 13, 2017 07:46, "Don Wilhelm" <donw...@embarqmail.com> wrote:

Ken,

Sorry, but I do not.
There is a ham in England who produces a buffer amplifier that can be
used, but I cannot recall who.
If you ask on the reflector for a Clifton Labs Z1B replacement, you
may get some hits.

73,
Don W3FPR




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Re: [Elecraft] K2 IF output

[Byron Servies]

Hi Ken,

Clifton Labs products were acquired by DX Engineering:

https://www.dxengineering.com/techarticles/dxepressreleases/dx-engineering-acquires-clifton-laboratories

Perhaps they will know if the Z1000B is going to be produced again.

73, Byron N6NUL

On Mon, Feb 13, 2017 at 9:43 AM, Ken G Kopp  wrote:
> Who makes a Clifton Labs Z1000B replacement for the K2?
>


-- 
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Re: [Elecraft] K2 IF output

[David Anderson via Elecraft]

Ken,

Sorry to be the bearer of bad news, but G4HUP died last week at the age of 68, 
a great loss to the community.

We have no word on the future, if any, of his excellent products.

73 from David GM4JJJ

> On 13 Feb 2017, at 19:02, Ken Chandler  wrote:
> 
> Contact G4HUP who makes various kits, I've one here.
> See 
> http://G4hup.com.
> The work is first class.
> 
> Ken.. G0ORH
> 
> Sent from my iPad
> 
> 
>> On 13 Feb 2017, at 17:43, Ken G Kopp  wrote:
>> 
>> Who makes a Clifton Labs Z1000B replacement for the K2?
>> 
>>> On Feb 13, 2017 07:46, "Don Wilhelm"  wrote:
>>> 
>>> Ken,
>>> 
>>> Sorry, but I do not.
>>> There is a ham in England who produces a buffer amplifier that can be
>>> used, but I cannot recall who.
>>> If you ask on the reflector for a Clifton Labs Z1B replacement, you
>>> may get some hits.
>>> 
>>> 73,
>>> Don W3FPR
>>> 
 On 2/13/2017 9:20 AM, Ken G Kopp wrote:
 
 GM Don!
 
 Can / do you supply the IF output circuit for the K2?
 
 73
 
 Ken - K0PP
 
 On Feb 13, 2017 07:15, "Don Wilhelm donw...@embarqmail.com >>> donw...@embarqmail.com> [KX3]" >> kx3-nore...@yahoogroups.com>> wrote:
 
   Bob,
 
   Check out the Win4K3 software (http://va2fsq.com/spectrum-scopes/
   ). It
   has support for the KX2 which allows the use of SDRPlay to produce a
   panadapter display.
 
   73,
   Don W3FPR
 
 
 
   On 2/13/2017 8:29 AM, rl3ja...@gmail.com
    [KX3] wrote:
> 
> 
> So the question is - Has anyone been able to put together a viable
> support system for signal analysis (aka - Panadapter?) that can
   be used
> directly with the KX2?
> 
   __._,_.___
   
 
   Posted by: Don Wilhelm >
   
 
   Reply via web post
   
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Re: [Elecraft] K2 IF output

[Jack F6AJW]

Sadly, Dave G4HUP is now SK .

73's.

Jacques F6AJW

Le 13/02/2017 à 20:02, Ken Chandler a écrit :

Contact G4HUP who makes various kits, I've one here.
See
http://G4hup.com.
The work is first class.

Ken.. G0ORH

Sent from my iPad



On 13 Feb 2017, at 17:43, Ken G Kopp  wrote:

Who makes a Clifton Labs Z1000B replacement for the K2?


On Feb 13, 2017 07:46, "Don Wilhelm"  wrote:

Ken,

Sorry, but I do not.
There is a ham in England who produces a buffer amplifier that can be
used, but I cannot recall who.
If you ask on the reflector for a Clifton Labs Z1B replacement, you
may get some hits.

73,
Don W3FPR


On 2/13/2017 9:20 AM, Ken G Kopp wrote:

GM Don!

Can / do you supply the IF output circuit for the K2?

73

Ken - K0PP

On Feb 13, 2017 07:15, "Don Wilhelm donw...@embarqmail.com  [KX3]"  wrote:

Bob,

Check out the Win4K3 software (http://va2fsq.com/spectrum-scopes/
). It
has support for the KX2 which allows the use of SDRPlay to produce a
panadapter display.

73,
Don W3FPR



On 2/13/2017 8:29 AM, rl3ja...@gmail.com
 [KX3] wrote:


So the question is - Has anyone been able to put together a viable
support system for signal analysis (aka - Panadapter?) that can

be used

directly with the KX2?


__._,_.___


Posted by: Don Wilhelm >


Reply via web post

•   Reply to sender

•   Reply to group

•   Start a New Topic

(2)



Have you tried the highest rated email app? 
With 4.5 stars in iTunes, the Yahoo Mail app is the highest rated
email app on the market. What are you waiting for? Now you can
access all your inboxes (Gmail, Outlook, AOL and more) in one
place. Never delete an email again with 1000GB of free cloud storage.


Visit Your Group



  * New Members

11
  * New Photos

1

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• Privacy
 •
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 •
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.

__,_._,___




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Re: [Elecraft] K2 IF output

[donovanf]

G4HUP is a silent key RIP 

- Original Message -

From: "Ken Chandler" <g0...@sky.com> 
To: "Ken G Kopp" <kengk...@gmail.com> 
Cc: elecraft@mailman.qth.net 
Sent: Monday, February 13, 2017 7:02:47 PM 
Subject: Re: [Elecraft] K2 IF output 

Contact G4HUP who makes various kits, I've one here. 
See 
http://G4hup.com. 
The work is first class. 

Ken.. G0ORH 

Sent from my iPad 


> On 13 Feb 2017, at 17:43, Ken G Kopp <kengk...@gmail.com> wrote: 
> 
> Who makes a Clifton Labs Z1000B replacement for the K2? 
> 
>> On Feb 13, 2017 07:46, "Don Wilhelm" <donw...@embarqmail.com> wrote: 
>> 
>> Ken, 
>> 
>> Sorry, but I do not. 
>> There is a ham in England who produces a buffer amplifier that can be 
>> used, but I cannot recall who. 
>> If you ask on the reflector for a Clifton Labs Z1B replacement, you 
>> may get some hits. 
>> 
>> 73, 
>> Don W3FPR 
>> 
>>> On 2/13/2017 9:20 AM, Ken G Kopp wrote: 
>>> 
>>> GM Don! 
>>> 
>>> Can / do you supply the IF output circuit for the K2? 
>>> 
>>> 73 
>>> 
>>> Ken - K0PP 
>>> 
>>> On Feb 13, 2017 07:15, "Don Wilhelm donw...@embarqmail.com >> donw...@embarqmail.com> [KX3]" <kx3-nore...@yahoogroups.com >> kx3-nore...@yahoogroups.com>> wrote: 
>>> 
>>> Bob, 
>>> 
>>> Check out the Win4K3 software (http://va2fsq.com/spectrum-scopes/ 
>>> <http://va2fsq.com/spectrum-scopes/>). It 
>>> has support for the KX2 which allows the use of SDRPlay to produce a 
>>> panadapter display. 
>>> 
>>> 73, 
>>> Don W3FPR 
>>> 
>>> 
>>> 
>>> On 2/13/2017 8:29 AM, rl3ja...@gmail.com 
>>> <mailto:rl3ja...@gmail.com> [KX3] wrote: 
>>>> 
>>>> 
>>>> So the question is - Has anyone been able to put together a viable 
>>>> support system for signal analysis (aka - Panadapter?) that can 
>>> be used 
>>>> directly with the KX2? 
>>>> 
>>> __._,_.___ 
>>>  
>>>  
>>> Posted by: Don Wilhelm <donw...@embarqmail.com 
>>> <mailto:donw...@embarqmail.com>> 
>>>  
>>>  
>>> Reply via web post 
>>> <https://groups.yahoo.com/neo/groups/KX3/conversations/messa 
>>> ges/61168;_ylc=X3oDMTJybnBybGFwBF9TAzk3MzU5NzE0BGdycElkAzc0N 
>>> TIwOTQ3BGdycHNwSWQDMTcwNTA2MzEwOARtc2dJZAM2MTE2OARzZWMDZnRyB 
>>> HNsawNycGx5BHN0aW1lAzE0ODY5OTUzMTE-?act=reply=61168> 
>>> • Reply to sender 
>>> <mailto:donw...@embarqmail.com?subject=Re%3A%20%5BKX3%5D%20K 
>>> X2%20Spectrum%20Software%3F> 
>>> • Reply to group 
>>> <mailto:k...@yahoogroups.com?subject=Re%3A%20%5BKX3%5D%20KX2% 
>>> 20Spectrum%20Software%3F> 
>>> • Start a New Topic 
>>> <https://groups.yahoo.com/neo/groups/KX3/conversations/newto 
>>> pic;_ylc=X3oDMTJmOGxubG1hBF9TAzk3MzU5NzE0BGdycElkAzc0NTIwOTQ 
>>> 3BGdycHNwSWQDMTcwNTA2MzEwOARzZWMDZnRyBHNsawNudHBjBHN0aW1lAzE0ODY5OTUzMTE- 
>>>> 
>>> • Messages in this topic 
>>> <https://groups.yahoo.com/neo/groups/KX3/conversations/topic 
>>> s/61167;_ylc=X3oDMTM3NW9wZzloBF9TAzk3MzU5NzE0BGdycElkAzc0NTI 
>>> wOTQ3BGdycHNwSWQDMTcwNTA2MzEwOARtc2dJZAM2MTE2OARzZWMDZnRyBHN 
>>> sawN2dHBjBHN0aW1lAzE0ODY5OTUzMTEEdHBjSWQDNjExNjc-> 
>>> (2) 
>>> 
>>>  
>>>  
>>> Have you tried the highest rated email app? <https://yho.com/1wwmgg> 
>>> With 4.5 stars in iTunes, the Yahoo Mail app is the highest rated 
>>> email app on the market. What are you waiting for? Now you can 
>>> access all your inboxes (Gmail, Outlook, AOL and more) in one 
>>> place. Never delete an email again with 1000GB of free cloud storage. 
>>>  
>>>  
>>> Visit Your Group 
>>> <https://groups.yahoo.com/neo/groups/KX3/info;_ylc=X3oDMTJma 
>>> mppbnVuBF9TAzk3MzU5NzE0BGdycElkAzc0NTIwOTQ3BGdycHNwSWQDMTcwN 
>>> TA2MzEwOARzZWMDdnRsBHNsawN2Z2hwBHN0aW1lAzE0ODY5OTUzMTE-> 
>>> 
>>> 
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>>> <https://groups.yahoo.com/neo/groups/KX3/members/all;_ylc=X3 
>>> oDMTJnaWxsbTY2BF9TAzk3MzU5NzE0BGdycEl

Re: [Elecraft] K2 IF output

[Ken Chandler]

Contact G4HUP who makes various kits, I've one here.
See 
http://G4hup.com.
The work is first class.

Ken.. G0ORH

Sent from my iPad


> On 13 Feb 2017, at 17:43, Ken G Kopp  wrote:
> 
> Who makes a Clifton Labs Z1000B replacement for the K2?
> 
>> On Feb 13, 2017 07:46, "Don Wilhelm"  wrote:
>> 
>> Ken,
>> 
>> Sorry, but I do not.
>> There is a ham in England who produces a buffer amplifier that can be
>> used, but I cannot recall who.
>> If you ask on the reflector for a Clifton Labs Z1B replacement, you
>> may get some hits.
>> 
>> 73,
>> Don W3FPR
>> 
>>> On 2/13/2017 9:20 AM, Ken G Kopp wrote:
>>> 
>>> GM Don!
>>> 
>>> Can / do you supply the IF output circuit for the K2?
>>> 
>>> 73
>>> 
>>> Ken - K0PP
>>> 
>>> On Feb 13, 2017 07:15, "Don Wilhelm donw...@embarqmail.com >> donw...@embarqmail.com> [KX3]" > kx3-nore...@yahoogroups.com>> wrote:
>>> 
>>>Bob,
>>> 
>>>Check out the Win4K3 software (http://va2fsq.com/spectrum-scopes/
>>>). It
>>>has support for the KX2 which allows the use of SDRPlay to produce a
>>>panadapter display.
>>> 
>>>73,
>>>Don W3FPR
>>> 
>>> 
>>> 
>>>On 2/13/2017 8:29 AM, rl3ja...@gmail.com
>>> [KX3] wrote:
 
 
 So the question is - Has anyone been able to put together a viable
 support system for signal analysis (aka - Panadapter?) that can
>>>be used
 directly with the KX2?
 
>>>__._,_.___
>>>
>>> 
>>>Posted by: Don Wilhelm >>>
>>>
>>> 
>>>Reply via web post
>>>>> ges/61168;_ylc=X3oDMTJybnBybGFwBF9TAzk3MzU5NzE0BGdycElkAzc0N
>>> TIwOTQ3BGdycHNwSWQDMTcwNTA2MzEwOARtc2dJZAM2MTE2OARzZWMDZnRyB
>>> HNsawNycGx5BHN0aW1lAzE0ODY5OTUzMTE-?act=reply=61168>
>>>•   Reply to sender
>>>>> X2%20Spectrum%20Software%3F>
>>>•   Reply to group
>>>>> 20Spectrum%20Software%3F>
>>>•   Start a New Topic
>>>>> pic;_ylc=X3oDMTJmOGxubG1hBF9TAzk3MzU5NzE0BGdycElkAzc0NTIwOTQ
>>> 3BGdycHNwSWQDMTcwNTA2MzEwOARzZWMDZnRyBHNsawNudHBjBHN0aW1lAzE0ODY5OTUzMTE-
 
>>>•   Messages in this topic
>>>>> s/61167;_ylc=X3oDMTM3NW9wZzloBF9TAzk3MzU5NzE0BGdycElkAzc0NTI
>>> wOTQ3BGdycHNwSWQDMTcwNTA2MzEwOARtc2dJZAM2MTE2OARzZWMDZnRyBHN
>>> sawN2dHBjBHN0aW1lAzE0ODY5OTUzMTEEdHBjSWQDNjExNjc->
>>>(2)
>>> 
>>>
>>> 
>>>Have you tried the highest rated email app? 
>>>With 4.5 stars in iTunes, the Yahoo Mail app is the highest rated
>>>email app on the market. What are you waiting for? Now you can
>>>access all your inboxes (Gmail, Outlook, AOL and more) in one
>>>place. Never delete an email again with 1000GB of free cloud storage.
>>>
>>> 
>>>Visit Your Group
>>>>> mppbnVuBF9TAzk3MzU5NzE0BGdycElkAzc0NTIwOTQ3BGdycHNwSWQDMTcwN
>>> TA2MzEwOARzZWMDdnRsBHNsawN2Z2hwBHN0aW1lAzE0ODY5OTUzMTE->
>>> 
>>> 
>>>  * New Members
>>>>> oDMTJnaWxsbTY2BF9TAzk3MzU5NzE0BGdycElkAzc0NTIwOTQ3BGdycHNwSW
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>>>11
>>>  * New Photos
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>>>1
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Re: [Elecraft] K2 IF output

[Heinz Bärtschi]

That would be an option:

IF Adapter full kit (SMD components):
http://www.qrp-shop.biz/epages/qrp-shop.sf/de_DE/?ObjectPath=/Shops/qrp-shop/Products/Vk2zfadapter

IF Adapter kit (all SMD components soldered):
http://www.qrp-shop.biz/epages/qrp-shop.sf/de_DE/?ObjectPath=/Shops/qrp-shop/Products/Vk2zfadapterBestückt

73, Heinz HB9BCB


> Am 13.02.2017 um 18:43 schrieb Ken G Kopp :
> 
> Who makes a Clifton Labs Z1000B replacement for the K2?
> 
>> On Feb 13, 2017 07:46, "Don Wilhelm"  wrote:
>> 
>> Ken,
>> 
>> Sorry, but I do not.
>> There is a ham in England who produces a buffer amplifier that can be
>> used, but I cannot recall who.
>> If you ask on the reflector for a Clifton Labs Z1B replacement, you
>> may get some hits.
>> 
>> 73,
>> Don W3FPR
>>> 

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Re: [Elecraft] K2 IF output

[Ken G Kopp]

Who makes a Clifton Labs Z1000B replacement for the K2?

On Feb 13, 2017 07:46, "Don Wilhelm"  wrote:

> Ken,
>
> Sorry, but I do not.
> There is a ham in England who produces a buffer amplifier that can be
> used, but I cannot recall who.
> If you ask on the reflector for a Clifton Labs Z1B replacement, you
> may get some hits.
>
> 73,
> Don W3FPR
>
> On 2/13/2017 9:20 AM, Ken G Kopp wrote:
>
>> GM Don!
>>
>> Can / do you supply the IF output circuit for the K2?
>>
>> 73
>>
>> Ken - K0PP
>>
>> On Feb 13, 2017 07:15, "Don Wilhelm donw...@embarqmail.com > donw...@embarqmail.com> [KX3]"  kx3-nore...@yahoogroups.com>> wrote:
>>
>> Bob,
>>
>> Check out the Win4K3 software (http://va2fsq.com/spectrum-scopes/
>> ). It
>> has support for the KX2 which allows the use of SDRPlay to produce a
>> panadapter display.
>>
>> 73,
>> Don W3FPR
>>
>>
>>
>> On 2/13/2017 8:29 AM, rl3ja...@gmail.com
>>  [KX3] wrote:
>> >
>> >
>> > So the question is - Has anyone been able to put together a viable
>> > support system for signal analysis (aka - Panadapter?) that can
>> be used
>> > directly with the KX2?
>> >
>> __._,_.___
>> 
>> 
>> Posted by: Don Wilhelm > >
>> 
>> 
>> Reply via web post
>> > ges/61168;_ylc=X3oDMTJybnBybGFwBF9TAzk3MzU5NzE0BGdycElkAzc0N
>> TIwOTQ3BGdycHNwSWQDMTcwNTA2MzEwOARtc2dJZAM2MTE2OARzZWMDZnRyB
>> HNsawNycGx5BHN0aW1lAzE0ODY5OTUzMTE-?act=reply=61168>
>> •   Reply to sender
>> > X2%20Spectrum%20Software%3F>
>> •   Reply to group
>> > 20Spectrum%20Software%3F>
>> •   Start a New Topic
>> > pic;_ylc=X3oDMTJmOGxubG1hBF9TAzk3MzU5NzE0BGdycElkAzc0NTIwOTQ
>> 3BGdycHNwSWQDMTcwNTA2MzEwOARzZWMDZnRyBHNsawNudHBjBHN0aW1lAzE0ODY5OTUzMTE-
>> >
>> •   Messages in this topic
>> > s/61167;_ylc=X3oDMTM3NW9wZzloBF9TAzk3MzU5NzE0BGdycElkAzc0NTI
>> wOTQ3BGdycHNwSWQDMTcwNTA2MzEwOARtc2dJZAM2MTE2OARzZWMDZnRyBHN
>> sawN2dHBjBHN0aW1lAzE0ODY5OTUzMTEEdHBjSWQDNjExNjc->
>> (2)
>>
>> 
>> 
>> Have you tried the highest rated email app? 
>> With 4.5 stars in iTunes, the Yahoo Mail app is the highest rated
>> email app on the market. What are you waiting for? Now you can
>> access all your inboxes (Gmail, Outlook, AOL and more) in one
>> place. Never delete an email again with 1000GB of free cloud storage.
>> 
>> 
>> Visit Your Group
>> > mppbnVuBF9TAzk3MzU5NzE0BGdycElkAzc0NTIwOTQ3BGdycHNwSWQDMTcwN
>> TA2MzEwOARzZWMDdnRsBHNsawN2Z2hwBHN0aW1lAzE0ODY5OTUzMTE->
>>
>>
>>   * New Members
>> > oDMTJnaWxsbTY2BF9TAzk3MzU5NzE0BGdycElkAzc0NTIwOTQ3BGdycHNwSW
>> QDMTcwNTA2MzEwOARzZWMDdnRsBHNsawN2bWJycwRzdGltZQMxNDg2OTk1MzEx>
>> 11
>>   * New Photos
>> > _ylc=X3oDMTJnaWdyN21hBF9TAzk3MzU5NzE0BGdycElkAzc0NTIwOTQ3BGd
>> ycHNwSWQDMTcwNTA2MzEwOARzZWMDdnRsBHNsawN2cGhvdARzdGltZQMxNDg2OTk1MzEx>
>> 1
>>
>> Yahoo! Groups
>> > zU5NzE0BGdycElkAzc0NTIwOTQ3BGdycHNwSWQDMTcwNTA2MzEwOARzZWMDZ
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>>
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Re: [Elecraft] K2 audio output low after upgrades

[Iain Kelly M0PCB]

Hi Don,

Thanks for the pointers. We've just spent half an hour working through 
all of the steps that Chloe had gone through to install the extras and 
we spotted a few joints that needed touching up from the previous 
owner's build. Just tested the radio and we're back to full audio 
output. Not 100% sure which of the steps fixed it, but we're glad it's 
sorted.


Thanks for your advice, Chloe is just finalising the re-assembly after 
testing so she'll be on the air again in no time.


73, Iain M0PCB

On 31/08/2013 19:46, Don Wilhelm wrote:

Iain,

I suspect it is not really an audio problem, but a problem somewhere 
in the receiver front end or IF or product detector.  If the S-meter 
is less lively than before, the problem is prior to the Product 
Detector, but if the S-meter has the usual response, look at the 
product detector and audio amp connections.  Was the KAF2 plugged into 
the headers one pin too high - that leaves only half of the audio path 
operative.


I would suspect the K60XV above all the other options.  Pull it out of 
the socket and jumper J13 between pins 3 and 5 with a short wire.  If 
the receive comes alive (it is not expected to work on 40 meters), 
then the K60XV is the problem spot.
It is easy to remove the KAT2 for a test, just pull the cables out and 
connect the antenna to the base K2..
If the other options were removed, make certain they are plugged in 
correctly and not one pin off.
You can bypass the KSB2 for receive (not transmit) with a wire jumper 
plugged between pins 1 and 3 of J9 and J10.
The K160RX can be bypassed by putting a wire jumper between pins 1 and 
7 of J14.


If all those things check out OK, then look for something that was 
inadvertently moved during the addition of the new options.


73,
Don W3FPR

On 8/31/2013 11:34 AM, Iain Kelly M0PCB wrote:

Greetings list,

I've been assisting my partner Chloe M0GEJ with some upgrades to her 
K2 (s/n 5484) and we've come a bit unstuck.


It's  a base K2 with SSB, 160m and the KAF2. She has added the 
internal ATU and the 60M module. She also had to replace a faulty 
headphone jack on the front panel as it had gone u/s. When 
re-assembled we noticed the audio output level is significantly down 
on what it was before.


The CW side-tone level is unaffected. Both the speaker and phone jack 
are affected. The audio level at maximum volume setting is just below 
normal levels required in headphonesand not very loud for internal 
speaker use.


What we have tried:

 - Full receive and transmit alignment: signals are received well and 
showing good strength on the s-meter, both off-air and from my signal 
generator.

 - RF Gain set to Max
 - Checked RANT selection
 - Checked R1 (AGC Threshold setting)
 - Measured the 5V and 8V lines
 - Replaced U9 (LM380N-08) on the main board in case the old damaged 
headphone jack had caused damage.






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[Elecraft] K2 audio output low after upgrades

[Iain Kelly M0PCB]

Greetings list,

I've been assisting my partner Chloe M0GEJ with some upgrades to her K2 
(s/n 5484) and we've come a bit unstuck.


It's  a base K2 with SSB, 160m and the KAF2. She has added the internal 
ATU and the 60M module. She also had to replace a faulty headphone jack 
on the front panel as it had gone u/s. When re-assembled we noticed the 
audio output level is significantly down on what it was before.


The CW side-tone level is unaffected. Both the speaker and phone jack 
are affected. The audio level at maximum volume setting is just below 
normal levels required in headphonesand not very loud for internal 
speaker use.


What we have tried:

 - Full receive and transmit alignment: signals are received well and 
showing good strength on the s-meter, both off-air and from my signal 
generator.

 - RF Gain set to Max
 - Checked RANT selection
 - Checked R1 (AGC Threshold setting)
 - Measured the 5V and 8V lines
 - Replaced U9 (LM380N-08) on the main board in case the old damaged 
headphone jack had caused damage.


I've had a look at Google and not turned up much that has been of much 
further help. Wonder if this has happened to anyone else before?


Any pointers appreciated. If replying to the reflector please copy 
direct to my email address as I may miss responses in the daily digest.


Many thanks,

Iain M0PCB  Chloe M0GEJ


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Re: [Elecraft] K2 audio output low after upgrades

[Don Wilhelm]

Iain,

I suspect it is not really an audio problem, but a problem somewhere in 
the receiver front end or IF or product detector.  If the S-meter is 
less lively than before, the problem is prior to the Product Detector, 
but if the S-meter has the usual response, look at the product detector 
and audio amp connections.  Was the KAF2 plugged into the headers one 
pin too high - that leaves only half of the audio path operative.


I would suspect the K60XV above all the other options.  Pull it out of 
the socket and jumper J13 between pins 3 and 5 with a short wire.  If 
the receive comes alive (it is not expected to work on 40 meters), then 
the K60XV is the problem spot.
It is easy to remove the KAT2 for a test, just pull the cables out and 
connect the antenna to the base K2..
If the other options were removed, make certain they are plugged in 
correctly and not one pin off.
You can bypass the KSB2 for receive (not transmit) with a wire jumper 
plugged between pins 1 and 3 of J9 and J10.
The K160RX can be bypassed by putting a wire jumper between pins 1 and 7 
of J14.


If all those things check out OK, then look for something that was 
inadvertently moved during the addition of the new options.


73,
Don W3FPR

On 8/31/2013 11:34 AM, Iain Kelly M0PCB wrote:

Greetings list,

I've been assisting my partner Chloe M0GEJ with some upgrades to her 
K2 (s/n 5484) and we've come a bit unstuck.


It's  a base K2 with SSB, 160m and the KAF2. She has added the 
internal ATU and the 60M module. She also had to replace a faulty 
headphone jack on the front panel as it had gone u/s. When 
re-assembled we noticed the audio output level is significantly down 
on what it was before.


The CW side-tone level is unaffected. Both the speaker and phone jack 
are affected. The audio level at maximum volume setting is just below 
normal levels required in headphonesand not very loud for internal 
speaker use.


What we have tried:

 - Full receive and transmit alignment: signals are received well and 
showing good strength on the s-meter, both off-air and from my signal 
generator.

 - RF Gain set to Max
 - Checked RANT selection
 - Checked R1 (AGC Threshold setting)
 - Measured the 5V and 8V lines
 - Replaced U9 (LM380N-08) on the main board in case the old damaged 
headphone jack had caused damage.




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[Elecraft] [K2] Low Output Power solved

[Curt]

Turned on my K2 after about 4 months of not being used.  No evident output 
power!  The rig has worked well without issues for several years since I built 
it.  

Checked with dummy load and was actually putting out about 200mW.  Searching 
archives, found similar problem mentioned with Don suggesting to follow manual 
procedures to get some data.  Nil RF at Q5 sollector, DC  voltage fine, D1 
anode RF high.  Pushed on D1 with plastic tuning tool and output came back, 
intermittent.  Reflowed solder on D1 connections, all good now.

Bottom line, Don's advice spot on, manual procedures work, most problems caused 
by poor soldering by the builder (me).  I have identifies (soldering) problems 
on many rigs (that I didn't build) by pushing and prodding components with a 
plastic tuning tool.

73, Curt KB5JO
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Re: [Elecraft] K2: Low Output Only on 160M

[mteberle]

Don, thanks for your reply.  I do not understand your reference to page 14.   
Page 14 in my manual is nothing but resistors being installed.

I have noticed that it is drawing 3.3 amps when set for 2 watts and displays 
Hi-Cur.

I have checked all the components you mentioned and everything appears to be 
correct. 
Checking the TP1, I get 6714 khz.

- Original Message -
From: Don Wilhelm w3...@embarqmail.com
To: mtebe...@mchsi.com
Cc: elecraft@mailman.qth.net
Sent: Saturday, May 11, 2013 2:57:55 PM GMT -06:00 US/Canada Central
Subject: Re: [Elecraft] K2: Low Output Only on 160M

Mike,

The easiest way to troubleshoot that problem is to isolate the problem 
to the failing stage.
Use the RF Probe and measure the points given for the transmit path 
starting halfway down the left column on page 14
Making those measurements on 40 meters will not be meaningful for your 
problem, but if you switch between 80 meters (or another working band) 
and 160 meters, you can compare the amount of RF voltage at each stage.
Make the measurements in the order listed.  The first point where the RF 
voltage is significantly lower on 160 meters is a likely suspect.

Possible problem spots are:
1) The Transmit Buffer - are C94 and C150 the correct values and well 
soldered?
2) The Bandpass Filter - are C13 and C14 the correct value (1200 pF 
marked 122) and well soldered?

Check the VFO frequency at TP1 with the internal counter probe when 
tuned to 1800 Hz.  It should be near 6715 kHz.  If it is not, check the 
value and soldering of C75 (470 pF marked 471).

Low pass filter problems usually result in both low power out and high 
current draw, but check the soldering of the K160RX toroids again.  Make 
certain the toroid leads are in the correct holes.

73,
Don W3FPR

On 5/11/2013 10:57 AM, Michael Eberle wrote:
 Hi,

 I am having problems with my output power on 160M.  It will only put 
 out about 1.5 watts when set for 10 watts.  On all the other bands I 
 am getting between 9.4 and 10.3 watts.
 I have double checked capacitors in the BPF section, double checked 
 capacitors and counted turns on toroid inductors on the low pass 
 filter board and found nothing obviously wrong.
 relay K3 is switching properly and I really don't know what else to 
 check.  It is my guess that someone on here will know exactly what I 
 did wrong or some other things to check.

 Thanks,
 Mike
 KI0HA
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Re: [Elecraft] K2: Low Output Only on 160M

[Don Wilhelm]

Sorry, that page 14 is at the back of the manual in the Troubleshooting 
Appendix.


73,
Don W3FPR

On 5/12/2013 5:50 AM, mtebe...@mchsi.com wrote:

Don, thanks for your reply.  I do not understand your reference to page 14.
Page 14 in my manual is nothing but resistors being installed.

I have noticed that it is drawing 3.3 amps when set for 2 watts and displays 
Hi-Cur.

I have checked all the components you mentioned and everything appears to be 
correct.
Checking the TP1, I get 6714 khz.

- Original Message -
From: Don Wilhelm w3...@embarqmail.com
To: mtebe...@mchsi.com
Cc: elecraft@mailman.qth.net
Sent: Saturday, May 11, 2013 2:57:55 PM GMT -06:00 US/Canada Central
Subject: Re: [Elecraft] K2: Low Output Only on 160M

Mike,

The easiest way to troubleshoot that problem is to isolate the problem
to the failing stage.
Use the RF Probe and measure the points given for the transmit path
starting halfway down the left column on page 14
Making those measurements on 40 meters will not be meaningful for your
problem, but if you switch between 80 meters (or another working band)
and 160 meters, you can compare the amount of RF voltage at each stage.
Make the measurements in the order listed.  The first point where the RF
voltage is significantly lower on 160 meters is a likely suspect.

Possible problem spots are:
1) The Transmit Buffer - are C94 and C150 the correct values and well
soldered?
2) The Bandpass Filter - are C13 and C14 the correct value (1200 pF
marked 122) and well soldered?

Check the VFO frequency at TP1 with the internal counter probe when
tuned to 1800 Hz.  It should be near 6715 kHz.  If it is not, check the
value and soldering of C75 (470 pF marked 471).

Low pass filter problems usually result in both low power out and high
current draw, but check the soldering of the K160RX toroids again.  Make
certain the toroid leads are in the correct holes.

73,
Don W3FPR

On 5/11/2013 10:57 AM, Michael Eberle wrote:

Hi,

I am having problems with my output power on 160M.  It will only put
out about 1.5 watts when set for 10 watts.  On all the other bands I
am getting between 9.4 and 10.3 watts.
I have double checked capacitors in the BPF section, double checked
capacitors and counted turns on toroid inductors on the low pass
filter board and found nothing obviously wrong.
relay K3 is switching properly and I really don't know what else to
check.  It is my guess that someone on here will know exactly what I
did wrong or some other things to check.

Thanks,
Mike
KI0HA
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[Elecraft] K2: Low Output Only on 160M

[Michael Eberle]

Hi,

I am having problems with my output power on 160M.  It will only put out 
about 1.5 watts when set for 10 watts.  On all the other bands I am 
getting between 9.4 and 10.3 watts.
I have double checked capacitors in the BPF section, double checked 
capacitors and counted turns on toroid inductors on the low pass filter 
board and found nothing obviously wrong.
relay K3 is switching properly and I really don't know what else to 
check.  It is my guess that someone on here will know exactly what I did 
wrong or some other things to check.


Thanks,
Mike
KI0HA
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Re: [Elecraft] K2: Low Output Only on 160M

[Don Wilhelm]

Mike,

The easiest way to troubleshoot that problem is to isolate the problem 
to the failing stage.
Use the RF Probe and measure the points given for the transmit path 
starting halfway down the left column on page 14
Making those measurements on 40 meters will not be meaningful for your 
problem, but if you switch between 80 meters (or another working band) 
and 160 meters, you can compare the amount of RF voltage at each stage.
Make the measurements in the order listed.  The first point where the RF 
voltage is significantly lower on 160 meters is a likely suspect.


Possible problem spots are:
1) The Transmit Buffer - are C94 and C150 the correct values and well 
soldered?
2) The Bandpass Filter - are C13 and C14 the correct value (1200 pF 
marked 122) and well soldered?


Check the VFO frequency at TP1 with the internal counter probe when 
tuned to 1800 Hz.  It should be near 6715 kHz.  If it is not, check the 
value and soldering of C75 (470 pF marked 471).


Low pass filter problems usually result in both low power out and high 
current draw, but check the soldering of the K160RX toroids again.  Make 
certain the toroid leads are in the correct holes.


73,
Don W3FPR

On 5/11/2013 10:57 AM, Michael Eberle wrote:

Hi,

I am having problems with my output power on 160M.  It will only put 
out about 1.5 watts when set for 10 watts.  On all the other bands I 
am getting between 9.4 and 10.3 watts.
I have double checked capacitors in the BPF section, double checked 
capacitors and counted turns on toroid inductors on the low pass 
filter board and found nothing obviously wrong.
relay K3 is switching properly and I really don't know what else to 
check.  It is my guess that someone on here will know exactly what I 
did wrong or some other things to check.


Thanks,
Mike
KI0HA
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[Elecraft] K2 Audio Output Mod

[Ariel Jacala]

Using the N0SS printed circuit board I am using the plans Don Wilhelm published 
in August 2009.  Are there resistance checks I can do to assure myself that I 
did an acceptable solder job?  My eyes and manual dexterity have deteriorated 
to a point that a 10x visual examination by myself assures me that things will 
work as planned.

Ariel NY4G

Sent from my iPad
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Re: [Elecraft] K2 Audio Output Mod

[Ariel Jacala]

The last sentence should have stated does not assure me ..

Ariel NY4G

Sent from my iPad

On Oct 11, 2012, at 10:31 AM, Ariel Jacala n...@hotmail.com wrote:

 Using the N0SS printed circuit board I am using the plans Don Wilhelm 
 published in August 2009.  Are there resistance checks I can do to assure 
 myself that I did an acceptable solder job?  My eyes and manual dexterity 
 have deteriorated to a point that a 10x visual examination by myself assures 
 me that things will work as planned.
 
 Ariel NY4G
 
 Sent from my iPad
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Re: [Elecraft] K2 Audio Output Mod

[Don Wilhelm]

Ariel,

There are very few places to check resistance.  You should find a high 
resistance at all pins of the LM386 (except perhaps pin 6 which is the 
voltage rail and pin 4 which is ground.

Note that all other pins have a capacitor and that will stop DC 
continuity - therefore giving a high resistance reading.
The best way to check it is to apply a sine wave (tune to a steady 
carrier) to the input and look with a 'scope at pins 2, 3 and 5.

73,
Don W3FPR

On 10/11/2012 10:30 AM, Ariel Jacala wrote:
 Using the N0SS printed circuit board I am using the plans Don Wilhelm 
 published in August 2009.  Are there resistance checks I can do to assure 
 myself that I did an acceptable solder job?  My eyes and manual dexterity 
 have deteriorated to a point that a 10x visual examination by myself assures 
 me that things will work as planned.

 Ariel NY4G



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[Elecraft] K2 Audio Output Level (WAS: Searching archives...)

[Ron D'Eau Claire]

Is Tony using the internal speaker? My K2 has lots of volume too, for phones
or its internal speaker, but Elecraft uses a fairly efficient speaker in
either the QRP or K2/100. Some external speakers are not nearly as
efficient. They assume lots of watts of audio are available to drive them. 

Ron AC7AC


-Original Message-
This seems quite anomalous...my K2 (and my K3) will blow one out of the 
room at half-setting or lower on the AF gain control...implying that 
something is quite amiss specifically with the two K2's in question.

John Ragle -- W1ZI

=

On 12/18/2010 12:40 PM, Tony Estep wrote:
 ...More audio output would be nice.

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Re: [Elecraft] K2/100 output power issues

[Holger Dörschel]

Hi, I tried to drive an external linear PA with my K2/100 (no tuners installed) 
and I have some issues with the output-Power:

I used a DIAMOND SX20C and a 50 ohms dummy-load for my measurements. I also 
used a Elecraft W2/2K. I think, the 2K-coupler is not the best choice but the 
tendency is the same.

1. I mesasured at 10.0, 50 and 100W output power at the KPA100 PL-antenna 
connector:

 3.5009.590110
 7.0009.595109
10.1009.078 90
14.0009.275 85
18.068   10.570 70
21.0008.960 65
24.8908.960 68
28.0006.859 70


2. I measured at 10.0W output power with switched off KPA100 at the K2 
BNC-antenna connector:

 3.50011.0
 7.00010.1
10.10010.1
14.00010.8
18.068 2.8
21.000 2.8
24.890 5.0
28.000 8.5


So I think there is a Problem with the 17-12m bands at the K2. But I think, 
there is also somethink wrong with the KPA100. The Output Power at 50W is to 
high.

Any hints?

Vy 73, Holger - DL9HDA
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Re: [Elecraft] K2/100 output power issues

[Don Wilhelm]

  Holger,

There is the possibility that the wattmeter in the KPA100 is not 
properly balanced and calibrated, and deserves to be re-checked.  
Calibrate the wattmeter at 80 watts rather than at 100 watts for best 
results.

You can expect some variation in the response of the wattmeter diodes 
with frequency, but not as much as you have observed.  Try 
re-calibrating first (you must achieve a deep null before attempting 
calibration), and then replace the diodes if the band to band variation 
is still quite high.  Use a non-metallic tool to adjust C1 for the null.

The measurements you made at the BNC connector are not valid since you 
did not completely remove the KPA100.  When the KPA100 is attached, that 
BNC connector is still connected to the input of the KPA100 and should 
not be used for output in that configuration (that is why a boot is 
supplied with the KPA100).

You may want to remove the KPA100 and test the base K2 for maximum power 
output on all bands.  If you do not have at least 10 watts of output 
from the base K2, you will not drive the KPA100 to a full 100 watts output.

73,
Don W3FPR

On 11/9/2010 7:19 AM, Holger Dörschel wrote:
 Hi, I tried to drive an external linear PA with my K2/100 (no tuners 
 installed) and I have some issues with the output-Power:

 I used a DIAMOND SX20C and a 50 ohms dummy-load for my measurements. I also 
 used a Elecraft W2/2K. I think, the 2K-coupler is not the best choice but the 
 tendency is the same.

 1. I mesasured at 10.0, 50 and 100W output power at the KPA100 PL-antenna 
 connector:

   3.5009.590110
   7.0009.595109
 10.1009.078 90
 14.0009.275 85
 18.068   10.570 70
 21.0008.960 65
 24.8908.960 68
 28.0006.859 70


 2. I measured at 10.0W output power with switched off KPA100 at the K2 
 BNC-antenna connector:

   3.50011.0
   7.00010.1
 10.10010.1
 14.00010.8
 18.068 2.8
 21.000 2.8
 24.890 5.0
 28.000 8.5


 So I think there is a Problem with the 17-12m bands at the K2. But I think, 
 there is also somethink wrong with the KPA100. The Output Power at 50W is to 
 high.

 Any hints?

 Vy 73, Holger - DL9HDA
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[Elecraft] K2/100 output power issues

[Holger Dörschel]

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Re: [Elecraft] K2/100 output power issues

[Holger Dörschel]

Dear Don,

I removed the cover on the on the right-hand side and then I unplugged only the 
connector at P6 AUX RF. All other connectors are still plugged in and for 
supply I used the power-pole connector.

Here are the measeurements at the BNC-conector at a supply of 12V (starter 
battery).

  MHz  RF Out (W)
 3.500   10.5
 7.000   11.5
10.100   11.0
14.000   12.0
18.068   12.1
21.000   11.1
24.890   10.1
28.0009.0

I think, that the results are still O.K. My K3 shows the same behaviour at 28 
Mhz!


So I have to check my KPA100. I will do this next weekend. So Don, thank you 
very much for your information.

Vy 73, Holger - DL9HDA

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[Elecraft] K2 Low output Power

[Tomy]

I have lower output on all bands except 75 meters. I get 115 watts output on 
75, and about 65 to 75 watts on all the other bands. Does not matter what 
antenna I use the swr is about 1.2 to 1 on all bands. The serial number is 
3213.  Any ideas would be helpful! 
 
Thanks

73! Tomy Ivan kf7gc
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Re: [Elecraft] K2 Low output Power

[Don Wilhelm]

  Tomy,

What happens into a 50 ohm dummy load?
Do you see any HI CUR messages?
Has it always been this way?  Or is this a new failure?
Is your power supply voltage dropping significantly during transmit?

If you power the K2 only through the 2.1mm coaxial power jack (remove 
the APP connector from the KPA100), then what is the maximum power on 
all bands?  If it is above 10 watts (typically 12), then the base K2 is 
OK.  But if the power is much lower than that, you have a problem with 
the base K2.

Make those checks and we will know better where to guide you.

73,
Don W3FPR


On 11/8/2010 2:10 PM, Tomy wrote:



 I have lower output on all bands except 75 meters. I get 115 watts output on 
 75, and about 65 to 75 watts on all the other bands. Does not matter what 
 antenna I use the swr is about 1.2 to 1 on all bands. The serial number is 
 3213.  Any ideas would be helpful!
   
 Thanks

 73! Tomy Ivan kf7gc
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[Elecraft] K2/100 output power issues

[Holger Dörschel]

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[Elecraft] K2, low output in digital modes

[raimon]

Hi Elekrafters

I need your help.

My K2/100 nr. 03529 with KSB2 SSB adapter and KAT 100 Antenna Tuner has 
been working perfectly since I built it, with the exception of some 
minor problems that were solved either with the help of Don Wilhelm or 
after a search in the e-mail list reflector.

But now I detected a problem unnoticed until now:

I work mainly CW and digital modes.

In 40, 30 and 20 meters, in PSK 31 or RTTY, I could get easily about 40 
watts output, corresponding to one bar flickering in ALC bargraf. So all 
was apparently all right.

But I have tried recently the 10 m. band and noticed that when selecting 
my RTTY filters configuration I can get only near 20 watts in rtty, and 
less than 10 watts in rtty-r.

When I use in this band the USB or LSB configuration, and transmit RTTY 
or PSK, I get about 90 watts, the same output as in CW..

I have seen now that this drop in output happens in all bands, but I 
had’nt noticed it because I was able to get 30-50 watts in the lower 
bands, even in RTTY configuration. The same output drop happens in QRP 
configuration.

Summarizing, in digital transmissions when in RTTY the output is 
significantly lower than when in SSB, and the higher the frequency the 
lower the output power.

I realigned my filters with the help of Spectrogram, applying the same 
settings for OP-! SSB and OP-1 RTTY (there were some small differences 
before this realignment), but to no avail.

Although I can continue working digital modes using the SSB 
configurations, I would like to know the reason of this behaviour and 
how to solve it.

Your help will be greatly appreciated.

Best regards

Raimon

EA3EZO

rfui...@telefonica.net

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Re: [Elecraft] K2, low output in digital modes

[Don Wilhelm]

Raimon,

If you have the RTTY FL1 filter set to OP1 and the BFO frequencies set 
the same as for SSB, there should be no difference.
EXCEPT
The RTTY filter set has an independent SSBCr setting in the menu, and it 
should always be set to 1-1 for data modes.
If you have the SSB menu SSBC set to add compression to the signal, that 
would explain the difference, but if so, it is causing distortion on 
your data signal.

Yes, you will have to increase the audio gain on the higher bands where 
the transmit gain is lower.

Re-check the filter settings.  If the FL1 filter is set to OP1 and the 
BFOs are set the same as for SSB, then there should be no difference if 
you set the SSBC menu parameter to 1-1.

73,
Don W3FPR

raimon wrote:
 Hi Elekrafters

 I need your help.

 My K2/100 nr. 03529 with KSB2 SSB adapter and KAT 100 Antenna Tuner has 
 been working perfectly since I built it, with the exception of some 
 minor problems that were solved either with the help of Don Wilhelm or 
 after a search in the e-mail list reflector.

 But now I detected a problem unnoticed until now:

 I work mainly CW and digital modes.

 In 40, 30 and 20 meters, in PSK 31 or RTTY, I could get easily about 40 
 watts output, corresponding to one bar flickering in ALC bargraf. So all 
 was apparently all right.

 But I have tried recently the 10 m. band and noticed that when selecting 
 my RTTY filters configuration I can get only near 20 watts in rtty, and 
 less than 10 watts in rtty-r.

 When I use in this band the USB or LSB configuration, and transmit RTTY 
 or PSK, I get about 90 watts, the same output as in CW..

 I have seen now that this drop in output happens in all bands, but I 
 had’nt noticed it because I was able to get 30-50 watts in the lower 
 bands, even in RTTY configuration. The same output drop happens in QRP 
 configuration.

 Summarizing, in digital transmissions when in RTTY the output is 
 significantly lower than when in SSB, and the higher the frequency the 
 lower the output power.

 I realigned my filters with the help of Spectrogram, applying the same 
 settings for OP-! SSB and OP-1 RTTY (there were some small differences 
 before this realignment), but to no avail.

 Although I can continue working digital modes using the SSB 
 configurations, I would like to know the reason of this behaviour and 
 how to solve it.

 Your help will be greatly appreciated.

 Best regards

 Raimon


   
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[Elecraft] [K2] Erratic output on 160m

[Robin Kiszka]

Hi -

My K2 has a 160m option as well as the SSB Option. On all bands, 80 - 10m I
get good SSB transmission. Using a dummy load and watt meter I can see the
SSB transmission is stable and varies between dips of 4-5 watts up to peaks
of 13 watts (I'm not using the 100W PA).

This is not the case on 160m. On CW I get a sold 15W out on 160m, but when
using LSB I see the watt meter is hovering between 0-2 W, but when I whistle
into the microphone it goes all the way up to 15 W. The question is then why
is 160m so lacking in response to voice when compared with the other bands
that have far more sensitivity. I am using the delivered MH2 microphone.

I have disabled the antenna tuner, but this makes no difference. It's as if
the gain from the microphone is not getting through to the 160m option.
 
Any suggestions would be welcome.

Thanks and 73
Robin
OZ6ABM / 5P5R
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Re: [Elecraft] [K2] Erratic output on 160m

[Don Wilhelm]

Robin,

There is no difference in the K2 SSB generation from one band to 
another.  That means it the K2 is capable of full power in CW mode, and 
the K2 works fine on SSB on all other bands, it should work just fine in 
SSB on 160 meters.
Is there any chance that your wattmeter is responding differently on 160 
than it is on other bands?
A quick look at the RF output with an 'oscilloscope would tell you the 
proper answer - just compare the waveform on 160 meters with that 
obtained on 80 or 40 meters.

73,
Don W3FPR

Robin Kiszka wrote:
 Hi -

 My K2 has a 160m option as well as the SSB Option. On all bands, 80 - 10m I
 get good SSB transmission. Using a dummy load and watt meter I can see the
 SSB transmission is stable and varies between dips of 4-5 watts up to peaks
 of 13 watts (I'm not using the 100W PA).

 This is not the case on 160m. On CW I get a sold 15W out on 160m, but when
 using LSB I see the watt meter is hovering between 0-2 W, but when I whistle
 into the microphone it goes all the way up to 15 W. The question is then why
 is 160m so lacking in response to voice when compared with the other bands
 that have far more sensitivity. I am using the delivered MH2 microphone.

 I have disabled the antenna tuner, but this makes no difference. It's as if
 the gain from the microphone is not getting through to the 160m option.
  
 Any suggestions would be welcome.
   

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Re: [Elecraft] [K2] Erratic output on 160m

[Robin Kiszka]

Hi Don,

I doubt there is any problem on the watt meter as it's working fine on other
radios for 160m. 
Another reason I suspect it is a K2 issue is because the K2 bar graph LED
hardly lights on 160m SSB Tx, whereas on 80m and up I can easily get 4 or 5
bars with normal LSB speech on Tx. It's like the radio is deaf to the
microphone on 160m.

73
Robin
OZ6ABM / 5P5R

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Re: [Elecraft] [K2] Erratic output on 160m

[Don Wilhelm]

Robin,

It is possible for the K2 to have lower transmit RF gain on 160 meters, 
but then since you can obtain full output by whistling into the 
microphone the K2 RF cahin has adequate gain on 160 meters.  The highest 
gain through the K2 transmit stages is normally at 40 or 30 meters 
although some show the highest gain somewhere between 80 meters and 40 
meters.  In any case, if you get any bars at all on the ALC indication 
that is sufficient for full output.  You might want to try increasing 
the compression a little - I normally run the compression on my K2 at 
3:1 - that will bring up ;;the average power for you.

73,
Don W3FPR

Robin Kiszka wrote:
 Hi Don,

 I doubt there is any problem on the watt meter as it's working fine on other
 radios for 160m. 
 Another reason I suspect it is a K2 issue is because the K2 bar graph LED
 hardly lights on 160m SSB Tx, whereas on 80m and up I can easily get 4 or 5
 bars with normal LSB speech on Tx. It's like the radio is deaf to the
 microphone on 160m.

 73
 Robin
 OZ6ABM / 5P5R
   

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[Elecraft] K2 power output during ATU TUNE

[AC6JA]

Does anyone know what the power output should drop to during a TUNE  
sequence with the ATU with using the latest firmware?
 
Mike AC6JA
K2 #028
**Refinance and lower payments online with Ditech. Visit 
www.ditech.com Today! 
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Re: [Elecraft] K2 power output during ATU TUNE

[AC6JA]

Just found the answer.  Firmware 1.05 or later drops the power output  
during a TUNE sequence to 3 watts.
Thanks.
 
Mike  AC6JA
K2 #028
 
 
In a message dated 6/14/2009 10:54:20 A.M. Pacific Daylight Time,  
ac...@aol.com writes:

Does  anyone know what the power output should drop to during a TUNE   
sequence with the ATU with using the latest firmware?

Mike  AC6JA
K2 #028
**Refinance and lower payments online with  Ditech. Visit 
www.ditech.com Today!  
(http://pr.atwola.com/promoclk/100126575x1221879746x1201405835/aol?redir=htt
p:%2F%2Fclk.atdmt.com%2FDEG%2Fgo%2F155848685%2Fdirect%2F01%2F
)
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Re: [Elecraft] K2 power output during ATU TUNE

[Don Wilhelm]

Mike,

If you have the 10 watt K2 with the KAT2, the power level for TUNE is 2 
watts
For the K2/100 with the KAT100, the TUNE power is 20 watts.

73,
Don W3FPR

ac...@aol.com wrote:
 Does anyone know what the power output should drop to during a TUNE  
 sequence with the ATU with using the latest firmware?
  
 Mike AC6JA
 K2 #028
   

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[Elecraft] K2 does output power drop with heat?

[dw]

Hi,
I'm looking at the KPA100 schematic.
I see Q3 (NPN MJE182) feeding U7B op-amp, and a reference to .6 to .9
vdc.
It looks like Q3 is being used to sense temperature.
I'm guessing its mounted on the heat-sink.
U7B looks like a current regulation config based on the IR drop on Q3.
Does this mean the amp automatically drops output power if the heat-sink
starts to warm up?

Thanks
Duane
N1BBR
-- 
 bw...@fastmail.net

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[Elecraft] [K2] Power output pot tight on CCW end

[Mike-WE0H]

My power output pot on my K2 is tight turning the last 1/4th until full 
CCW. Is this the way it is supposed to be or? It was that way before I 
installed it. It works but is tight turning at the low 1w range.

Thanks,
Mike
WE0H
K2 S/N 6698
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Re: [Elecraft] [K2] Power output pot tight on CCW end

[Don Wilhelm]

Mike,

That often happens if the knob is placed too close to the panel - the 
knob rubs on the metal housing that holds the shaft.  Try loosening the 
knob and moving it out just a bit.

73,
Don W3FPR

Mike-WE0H wrote:
 My power output pot on my K2 is tight turning the last 1/4th until full 
 CCW. Is this the way it is supposed to be or? It was that way before I 
 installed it. It works but is tight turning at the low 1w range.

 Thanks,
 Mike
 WE0H
 K2 S/N 6698
   

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Re: [Elecraft] K2 low output

[G4BUE]

Did you solve your problem, Ozzie?

I ask because I have the same problem on one of my K2s and cannot fix it.

Thanks and 73 de Chris, G4BUE



W6ICM wrote:
 
 My K2 has been working OK, until now...
 80, 40 and 30 it has full output, but the higher bands, the output is
 down.
 Did the alignment for those bands as per the manual. Didn't make any
 difference.
 I get 4-5 watts on 20 and 18 and 21 about 3 w, ten is down to 2 watts.
 Receiver sensitivity is OK.
 Any words of wisdom will be greatly appreciated.
 73
 Ozzie, w6icm
 
 
 

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Re: [Elecraft] K2 low output

[Vic K2VCO]

A couple of ideas: Make sure the trimmers that tune the bandpass filters 
are not set at the extreme end of their range. Also check that T2 and T4 
are wound properly, as shown in the manual.


G4BUE wrote:

Did you solve your problem, Ozzie?

I ask because I have the same problem on one of my K2s and cannot fix it.

Thanks and 73 de Chris, G4BUE



W6ICM wrote:

My K2 has been working OK, until now...
80, 40 and 30 it has full output, but the higher bands, the output is
down.
Did the alignment for those bands as per the manual. Didn't make any
difference.
I get 4-5 watts on 20 and 18 and 21 about 3 w, ten is down to 2 watts.
Receiver sensitivity is OK.
Any words of wisdom will be greatly appreciated.
73
Ozzie, w6icm



--
73,
Vic, K2VCO
Fresno CA
http://www.qsl.net/k2vco
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[Elecraft] K2 low output on 80

[Phil Zminda]

I recently noticed while on 80 cw with a watt meter attached, that my output on 
80 cw  was only about 2 to 3 watts at the low end of the band, even though the 
drive setting was for about 12 watts. I can't say I that I have checked the 
output on 80 cw recently, so this may not be new. I built and aligned the K2 
about a year ago and have the built-in tuner installed. I re-checked it with a 
dummy load and got the same results. If I tune to the center of the band the 
output goes up. At the high end, it also appears to drop off. Other bands seem 
OK. I intend to open it up and peak the alignment, but before I do that, is 
there anything else I should be looking for? 

Thanks,

Phil N3ZP
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Re: [Elecraft] K2 low output on 80

[Don Wilhelm]

Phil,

The first thing to check is the bandpass filter for 80 meters.  Check 
that L5 is properly soldered and has a value of 33 uHy.  Recheck the BPF 
peaking using a transmit power of 1.5 watts.


Normally, the response across 80 meters is rather flat, and I suspect 
that you have a problem with the coupling element in the BPF, namely L5.


Another thing to check is the VCO voltage (R30 voltage) at both ends of 
80 meters - if it drops below 1.5 volts at the low end or goes above 6.5 
volts at the high end, you have a problem with the VCO range.


73,
Don W3FPR

Phil Zminda wrote:
I recently noticed while on 80 cw with a watt meter attached, that my output on 80 cw  was only about 2 to 3 watts at the low end of the band, even though the drive setting was for about 12 watts. I can't say I that I have checked the output on 80 cw recently, so this may not be new. I built and aligned the K2 about a year ago and have the built-in tuner installed. I re-checked it with a dummy load and got the same results. If I tune to the center of the band the output goes up. At the high end, it also appears to drop off. Other bands seem OK. I intend to open it up and peak the alignment, but before I do that, is there anything else I should be looking for? 


Thanks,

Phil N3ZP

  

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[Elecraft] K2/100 output power fluctuation

[Ken, KA0W]

Hello! 

I'm noticing a power output fluctuation of about 10w on an external Array 
Solutions digital wattmeter and on an analog wattmeter out of my K2/100 (sn 
6384). 

The load isn't changing, tried different dummies, coax, and antennas too. Past 
recent history of station - no load problems thru 1.5kw.
 
It is more of an output jump, up and down - continuously back and forth. A fast 
jump, near instant. Doesn't matter much about power setting, whether 30w or 
100w. 
 
At the 10w level (PA not switched in) out fairly stable, no jump up and down 
jumping. 
 
When using the 20w limited tune initially starts at about 27w than drops to 
about 18.5w and remains there - no jumping.
 
When bypassing the 20w limited tune (holding Display and Tune)  I get the 
jumping.

RF getting into a  K2 sensing circuit that controls output? 
 
Another possibly related problem is thumbing noise in computer speakers. I have 
the audio running into the computer. At power levels 10w and under no thump. 
11w and above (PA switched in) there is a thump. Computer is otherwise RF proof 
from QRP thru 1.5kw, no problems with many other rigs and setups.
 
Book measurements and performance outside of problem listed above are 
excellent. Receive is outstanding, amazingly quiet on 40m and 80m. 
 
Anyone with similar K2/100 history ? Suggestions?
 
Thank you for any and all help.
 
Ken, KA0W
 
 
 
 
 
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Re: [Elecraft] K2/100 output power fluctuation

[Don Wilhelm]

Ken,

This is not a 'problem', but is a condition that does occur in some K2s.
The situation is that the K2 power control mechanism is a loop, and if 
the gain in the RF stages is high (the gain increases when the KPA100 
switches in), then the power control loop can oscillate with a period 
from a half second to 2 seconds.


The cure is to add damping to the control loop which will cause the loop 
oscillation to diminish more quickly.  The element to change is RF board 
R98.  Remove the KPA100 and operate only the base K2, then temporarily 
replace R98 with a variable resistor (about 2K should work fine).  
Adjust the pot to higher and higher resistances watching the power 
output on 10 meters.  When the 10 meter power begins to drop, that is 
about as far as you can go without impacting the power output on the 
higher bands - measure the resistance of the pot (after removing it) and 
use the next lower standard value resistor in place of the original R98.
This information can be found on the Elecraft website under Application 
Notes as Optional K2 Power Control or look at the direct link 
http://www.elecraft.com/Apps/Power_Control_Mod.html.


Your 'thumping' in the computer speakers indicate that you should get 
better shielded speakers (or shield the wires into and out of the computer).


73,
Don W3FPR

Ken, KA0W wrote:
Hello! 

I'm noticing a power output fluctuation of about 10w on an external Array Solutions digital wattmeter and on an analog wattmeter out of my K2/100 (sn 6384). 


The load isn't changing, tried different dummies, coax, and antennas too. Past 
recent history of station - no load problems thru 1.5kw.
 
It is more of an output jump, up and down - continuously back and forth. A fast jump, near instant. Doesn't matter much about power setting, whether 30w or 100w. 
 
At the 10w level (PA not switched in) out fairly stable, no jump up and down jumping. 

  

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[Elecraft] K2 power output/power on Oddidity

[Will]

Hi all,

	After some weeks away from my K2 construction, I'm just at the 
point of going through the Part III Alignment, when I noticed two odd 
things about my K2:


-First, whenever (in fact always now) I power up my K2, I see he usual
 'Elecraft' display light up as normal.  But instead of proceeding to the
 frequency display, I see a brief display of 'P 14.6'.  I can repeat this
 everytime.  Hmmm...

-On page 78, as I begin to set the power control, the display changes to
 show 'P 14.6' again, with the number increasing slightly as I turn the
 power control knob slowly clockwise to 14.8 (when I'm really meaning for
 it to be 2W).  Out of curiousity, I switch into TUNE mode briefly with
 DISPLAY set to the meter, and see the current jump from .360 A to 3.8A,
 along with a 'hicur' warning.

Now, would I be right in suspecting something is amiss with the power 
output control or I've got a short someplace that's creating a boost in 
output power someplace?


Thanks for any insight.

Will
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Re: [Elecraft] K2 - Low output during initial TX alignment

[JT Croteau]

On 9/4/07, Mychael Morohovich [EMAIL PROTECTED] wrote:
 I would like to offer that I do include a note with my K2 sets
 instructing the builder not to pull the leads too tightly while
 installing K2-T2.

Hi Mychael.

I didn't mean to sound insulting or belittle your service in anyway.
However, looking back at the email and thinking about how quickly I
wrote it, I can see how it can be construed as such.   So please
accept my apologies.

The incorrect installation of T2 was definitely my fault by pulling
the leads too tight.  However, had I taken to time to wind and tin the
toroids myself, I may have been a bit more patient with their actual
installation as well.  Who knows though, maybe not.

Thanks again.

-- 
JT Croteau, N1ESE - Manchester, NH
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Re: [Elecraft] K2 - Low output during initial TX alignment

[Mychael Morohovich]

Hi, John-

Thank you for your post, as well as for the use of my service. In rereading
what I had written, I believe that my post might have come with a terseness
that I had not intended, so my apologies as well. K2-T2 is a little tricky
to get right, as is communicating with the written word it would seem- hi!

73,

Mychael AA3WF
K2 #1025




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[Elecraft] K2 - Low output during initial TX alignment

[JT Croteau]

During the initial TX alignment of my K2, I can't seem to get the
output power above 0.2W - it fluctuates between 0.1 and 0.2 and
doesn't change as I adjust L1 and L2.  I am, however, able to tune L1
and L2 for RX just fine.  I am showing 350 mV at my dummy load so some
RF seems to be getting through.

I don't see any obvious soldering problems and T1 through T4 appear to
be wound correctly.  I have not done any signal tracing yet but
initial voltage check of the driver and finals appear fine.  However,
I am concerned about the voltage of the drivers collector.  It jumps
up to 14V at transmit but it's supposed to be 13.3V.

I have to go out and buy a new DMM so I can do signal tracing (my
cheap DMM has fixed probes and I can't adapt them properly).  Any
other ideas before I dive into signal tracing?

Thanks

-- 
JT Croteau, N1ESE - Manchester, NH
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Re: [Elecraft] K2 - Low output during initial TX alignment

[JT Croteau]

On 9/4/07, John Graf [EMAIL PROTECTED] wrote:
 One thing you might try is a relay reset.

Thanks John, this was one of the first things I tried.  No luck.  I've
done most of the checks in the 155 section of the troubleshooting
guide.  I'm at a loss as everything appears to be fine.

Back to it..

-- 
JT Croteau, N1ESE - Manchester, NH
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Re: [Elecraft] K2 - Low output during initial TX alignment

[Don Wilhelm]

JT,

The quickest and IMHO the easiest way to find the problem is to build up 
the RF Probe (the parts were included with your K2 kit).  Then turn the 
manual to Preparing for Transmit Signal Tracing in the troubleshooting 
appendix.  Follow the steps until you find a place where you have 
significantly lower RF voltage than expected - then *stop* because you 
have located the failing stage.


Once you have found the failing stage, find it on the schematic and look 
to see which components are used in that stage - check them all for 
proper values and good soldering.


If that effort did not solve the problem, we can be of further help.  
Right now, the list of things that could possibly be wrong is very long 
and we could only offer wild guesses.  Once narrowed to the failing 
stage, the isolation of the failing part becomes much easier.


73,
Don W3FPR

JT Croteau wrote:

On 9/4/07, John Graf [EMAIL PROTECTED] wrote:
  

One thing you might try is a relay reset.



Thanks John, this was one of the first things I tried.  No luck.  I've
done most of the checks in the 155 section of the troubleshooting
guide.  I'm at a loss as everything appears to be fine.

Back to it..

  

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Re: [Elecraft] K2 - Low output during initial TX alignment

[JT Croteau]

On 9/4/07, Don Wilhelm [EMAIL PROTECTED] wrote:
 The quickest and IMHO the easiest way to find the problem is to build up
 the RF Probe (the parts were included with your K2 kit).

Yeah, I need to go buy a new DMM as I have no way to connect the RF
probe to my current DMM.

However, I just checked the ALC circuit and found that VPWR is reading
high.  It is reading 4.9V on pin 2 of U8 (control board) during key
down.  According to the manual, this indicates a potential problem in
the RF detector stage.  I'm going to poke around the detector a bit
more and see if I can find any problems there.

-- 
JT Croteau, N1ESE - Manchester, NH
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Re: [Elecraft] K2 - Low output during initial TX alignment

[JT Croteau]

Don and others,

I just returned from buying a new DMM at RS and I didn't get very far
in signal tracing the transmitter before I started getting some
strange readings.

In my previous email, I mentioned that VPWR was reading high at 4.9V.
This can sometimes point to a problem in the RF output detector so I
checked all the components here and didn't find anything wrong so,
following the instructions, continued on with the signal tracing.

Transmit Mixer, Buffer, Band-Pass Filter, T-R Switch section - I am
finding some odd voltages here.  Voltages that do not match the
expected results listed.

These are all key-down voltages.

Xmit Mixer Output: 0.181  (Expected: 0.016)
Buffer Output: 2.05 (Expected: 0.200)
Band-Pass Filter Output: 0.444 (Expected: 0.030)
T-R Switch #1 Output: 0.439 (Expected: 0.029)

I am doing the signal tracing using 40M.

Do I need to worry about these?

Thanks

-- 
JT Croteau, N1ESE - Manchester, NH
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Re: [Elecraft] K2 - Low output during initial TX alignment

[Don Wilhelm]

JT,

If you have little or no RF output, do not be concerned about the early 
stages having more RF voltage than is expected when the power is normal 
(and that is your case).  Continue onward.


If the K2 senses no power output, VPWR will ramp up to a high level 
trying to obtain more power output, and the RF voltage produced by the 
*working* stages will be higher than normal until the proper amount of 
RF is detected at the output.


An added note - measure the RF voltage across your dummy load.  If there 
is lots of RF voltage there, then the transmitter is working and the 
problem is with the detector (D9 and associated components) rather than 
the transmitter stages, but if there really is no power output (or very 
little) then look to the transmitter stages for the problem. - Do heed 
the *if*s in the proceeding statement, they are very important.


Make the measurements in order and methodically as instructed in the 
manual and the steps will lead you to the failing stage.


73,
Don W3FPR

JT Croteau wrote:

Don and others,

I just returned from buying a new DMM at RS and I didn't get very far
in signal tracing the transmitter before I started getting some
strange readings.

In my previous email, I mentioned that VPWR was reading high at 4.9V.
This can sometimes point to a problem in the RF output detector so I
checked all the components here and didn't find anything wrong so,
following the instructions, continued on with the signal tracing.

Transmit Mixer, Buffer, Band-Pass Filter, T-R Switch section - I am
finding some odd voltages here.  Voltages that do not match the
expected results listed.

These are all key-down voltages.

Xmit Mixer Output: 0.181  (Expected: 0.016)
Buffer Output: 2.05 (Expected: 0.200)
Band-Pass Filter Output: 0.444 (Expected: 0.030)
T-R Switch #1 Output: 0.439 (Expected: 0.029)

I am doing the signal tracing using 40M.

Do I need to worry about these?

Thanks

  

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Re: [Elecraft] K2 - Low output during initial TX alignment

[JT Croteau]

On 9/4/07, Don Wilhelm [EMAIL PROTECTED] wrote:
 If you have little or no RF output

Exactly, this is my problem.  Continuing onward.

 An added note - measure the RF voltage across your dummy load.

I'm not seeing any RF voltage across the dummy load.  I am only seeing
about 350 mV of DC voltage across the DL1 on key-down.

I have just completed the Pre-driver, Driver, and PA signal tracing.
Things are very interesting here.  Driver voltages are very high,
especially the output voltage but the PA Inputs and Detector Input are
very low.

Pre-Driver Output: 1.841 V (Expected: 0.120 V)
Driver Input: 0.355 V (Expected: 0.026 V)
Driver Output: 8.04 V (Expected: 1.8 V)
PA Input (Q7): 0.030 V (Expected: 0.38 V)
PA Input (Q8): 0.002 V (Expected: 0.38 V)
RF Detector Input: 0.040 V (Expected: 2.0 V)

Does this mean I have a problem between the Driver and PA or do I have
a different problem area due the the high output of the Driver?

Thanks

-- 
JT Croteau, N1ESE - Manchester, NH
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Re: [Elecraft] K2 - Low output during initial TX alignment

[Don Wilhelm]

JT,

Fine information.  You have a problem between the collector of Q6 and 
the bases of Q7 and Q8.


Your next step is to turn to the schematic RF Board sheet 4 of 4 and 
locate Q6, Q7 and Q8 and all the components between them.  Check all for 
good soldering and be certain the 3 and 4 (green) leads of T2 are well 
tinned and soldered. 
You should have zero ohms between the end of R54 and the end of R53 (the 
ends that are connected to the T2 winding) - if not, T2 is not well 
tinned and soldered - if that is the problem, remove T2, re-strip the 
leads and re-install it, it is next to impossible to correct a poor lead 
tinning condition with the leads connected on the board (I have tried 
that and failed many times).  The T2 3/4 winding is the most likely 
source of your problem.


If you want to check  the components with your ohmmeter, you will have 
to lift one end of many of the components (RF Chokes and resistors), 
with the RF chokes paralleling the resistors it is just not possible to 
check the actual resistance in-circuit, but you can usually trust the 
color code markings - but be certain the correct resistor is in the 
right place.


73,
Don W3FPR



JT Croteau wrote:

On 9/4/07, Don Wilhelm [EMAIL PROTECTED] wrote:
  

If you have little or no RF output



Exactly, this is my problem.  Continuing onward.

  

An added note - measure the RF voltage across your dummy load.



I'm not seeing any RF voltage across the dummy load.  I am only seeing
about 350 mV of DC voltage across the DL1 on key-down.

I have just completed the Pre-driver, Driver, and PA signal tracing.
Things are very interesting here.  Driver voltages are very high,
especially the output voltage but the PA Inputs and Detector Input are
very low.

Pre-Driver Output: 1.841 V (Expected: 0.120 V)
Driver Input: 0.355 V (Expected: 0.026 V)
Driver Output: 8.04 V (Expected: 1.8 V)
PA Input (Q7): 0.030 V (Expected: 0.38 V)
PA Input (Q8): 0.002 V (Expected: 0.38 V)
RF Detector Input: 0.040 V (Expected: 2.0 V)

Does this mean I have a problem between the Driver and PA or do I have
a different problem area due the the high output of the Driver?

Thanks

  

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Re: [Elecraft] K2 - Low output during initial TX alignment

[JT Croteau]

On 9/4/07, Don Wilhelm [EMAIL PROTECTED] wrote:
 You should have zero ohms between the end of R54 and the end
 of R53 (the ends that are connected to the T2 winding) - if not, T2
 is not well tinned and soldered

Well, I am showing 12 ohms so I guess I'll have to take another look
at this bugger.

Thanks

-- 
JT Croteau, N1ESE - Manchester, NH
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Re: [Elecraft] K2 - Low output during initial TX alignment

[JT Croteau]

Holy cow!  I got it to work!

It was definitely a improperly tinned green lead on T2.  So much for
buying pre-wound/tinned 'roids to save me some grief.  Heh.

Thanks Don.  What a relief.  Time to button it back up and continue
40M TX alignment.

-- 
JT Croteau, N1ESE - Manchester, NH
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Re: [Elecraft] K2 - Low output during initial TX alignment

[Don Wilhelm]

JT,

The green leads of T2 are meant to be long so they can be routed under 
the core as shown in the manual.  Mychael does a good job of tinning the 
leads for the proper length, but if you tug on them during installation, 
you can pull the untinned portion of the lead into the hole and the 
result is a PTTL (poorly tinned solder lead).  If T2 is mounted right 
down on the board, there is often a drop-off of maximum power on the 
higher bands.  Should you encounter that difficulty, consider re-winding 
T2 as a first solution and mounting it 1/8 inch above the board.


73,
Don W3FPR

JT Croteau wrote:

Holy cow!  I got it to work!

It was definitely a improperly tinned green lead on T2.  So much for
buying pre-wound/tinned 'roids to save me some grief.  Heh.

Thanks Don.  What a relief.  Time to button it back up and continue
40M TX alignment.

  

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Re: [Elecraft] K2 - Low output during initial TX alignment

[Mychael Morohovich]

Hi, John-

Since I am the fellow who provides the pre wound toroids, I would like to
offer that I do include a note with my K2 sets instructing the builder not
to pull the leads too tightly while installing K2-T2 . Its design is a
little unusual insofar that the toroid is spaced slightly up off of the
PCB, its green secondary leads hidden under the core. I tin most parts up
to or onto the core itself, and with this part care must be taken not to
distort how the lengthy green leads are positioned since this could result
in pulling some enamel into the PCB. 

73,

Mychael AA3WF
K2#1025 


 It was definitely a improperly tinned green lead on T2.  So much for
 buying pre-wound/tinned 'roids to save me some grief.  Heh.
 JT Croteau, N1ESE - Manchester, NH




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[Elecraft] K2 - Low output power all bands

[mwconte]

I have one the early early K2's (SN:247) that's been on the air since 1999
and so believe it or not, I just finally put it on a QRP watt meter to see
what it was putting out and was surprised to see it was a pretty consistent
7-8 watts on all bands. It doesn't seem to make any difference if I raise
the power control above the 10 watt level. I'm just wondering if perhaps I'm
having a problem since most people seem to get around 10 watts out of their
K2's and we all know having an extra watt now and then can't hurt.

I started browsing through the archives but it's getting late, I'm heading
off to bed and I figure there are much brighter people out there that can
supply a suggestion or answer as to whether I actually have something amiss
or if there is something I should check out to bring it back in spec. I plan
to do an alignment on it but rather not go through the effort if it doesn't
seem worthwhile at this time.

Tnx es 73 de WA3ZII

Michael Conte
Located in Southern MD, USA

Email  : [EMAIL PROTECTED]
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[Elecraft] K2/100 output variation

[G3SJJ]

I am sure I have seen a discussion about this one before. During an 
enjoyable 160m opening to the Right Coast just before Christmas I was 
running a few Stateside stations and noticed a definite output power 
variation coming from my Acom 1000 which was being driven by the K2. I 
would guess that the drive power was varying between 30 and 50 watts. 
Any thoughts on this?


K2/100 5545 bought at Dayton this year, completed in September.

Chris G3SJJ
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Re: [Elecraft] K2/100 output variation

[Stewart Baker]

Chris,
Take a look here... http://www.elecraft.com/Apps/Power_Control_Mod.html

73
Stewart G3RXQ

On Wed, 27 Dec 2006 14:07:24 +, G3SJJ wrote:
 I am sure I have seen a discussion about this one before. During an

 enjoyable 160m opening to the Right Coast just before Christmas I was
 running a few Stateside stations and noticed a definite output power
 variation coming from my Acom 1000 which was being driven by the K2. I
 would guess that the drive power was varying between 30 and 50 watts.
 Any thoughts on this?

 K2/100 5545 bought at Dayton this year, completed in September.

 Chris G3SJJ
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Re: [Elecraft] K2/100 output variation

[G3SJJ]

No, that didn't help, Stewart. With the 100 PA disconnected and 5 watts 
requested, I see around 0.5 w difference in actual power and that is stable.


Having re-connected the 100 w pa to restore the K2/100 to the state I 
would normally use it, I have put a scope on the output. With requested 
power of 50w, in Tune the readout shows 29w immediately, dropping to 24, 
21 and 17w, it then toggles between 17 and 22w. I can see this stepping 
on the waveform displayed  on my scope. It also explains what I was 
seeing the other night. Since I was working pile-up style, the overs 
would be short, so each time I went to transmit the power variation in 
the K2 would also vary drive to the amp with the consequent output 
variation of between 100 and 200 w from the amp.


Chris G3SJJ



Stewart Baker wrote:

Chris,
Take a look here... http://www.elecraft.com/Apps/Power_Control_Mod.html

73
Stewart G3RXQ

On Wed, 27 Dec 2006 14:07:24 +, G3SJJ wrote:
  

I am sure I have seen a discussion about this one before. During an

enjoyable 160m opening to the Right Coast just before Christmas I was
running a few Stateside stations and noticed a definite output power
variation coming from my Acom 1000 which was being driven by the K2. I
would guess that the drive power was varying between 30 and 50 watts.
Any thoughts on this?

K2/100 5545 bought at Dayton this year, completed in September.

Chris G3SJJ
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Re: [Elecraft] K2/100 output variation

[Don]

I (and many others) have exactly the same power variation.  I just recently 
changed R99 to 1.1K and that reduced the variation in power to the point 
that I no longer notice the variations.  A check of maximum power output 
shows that I still get normal performance on all bands.


Don K7FJ

No, that didn't help, Stewart. With the 100 PA disconnected and 5 watts 
requested, I see around 0.5 w difference in actual power and that is 
stable.


Having re-connected the 100 w pa to restore the K2/100 to the state I 
would normally use it, I have put a scope on the output. With requested 
power of 50w, in Tune the readout shows 29w immediately, dropping to 24, 
21 and 17w, it then toggles between 17 and 22w. I can see this stepping on 
the waveform displayed  on my scope. It also explains what I was seeing 
the other night. Since I was working pile-up style, the overs would be 
short, so each time I went to transmit the power variation in the K2 would 
also vary drive to the amp with the consequent output variation of between 
100 and 200 w from the amp.


Chris G3SJJ



Stewart Baker wrote:

Chris,
Take a look here... http://www.elecraft.com/Apps/Power_Control_Mod.html

73
Stewart G3RXQ

On Wed, 27 Dec 2006 14:07:24 +, G3SJJ wrote:


I am sure I have seen a discussion about this one before. During an

enjoyable 160m opening to the Right Coast just before Christmas I was
running a few Stateside stations and noticed a definite output power
variation coming from my Acom 1000 which was being driven by the K2. I
would guess that the drive power was varying between 30 and 50 watts.
Any thoughts on this?

K2/100 5545 bought at Dayton this year, completed in September.

Chris G3SJJ
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RE: [Elecraft] K2/100 output variation

[Don Wilhelm]

Chris,

You cannot make a sound judgement using TUNE.  Evaluate the R98 value change
with actual keying.  If you change bands or change the power level, it will
take a few dot times to settle into the new power setting, that part of your
observation is normal.

The rest of the situation is due to the loop response of the ALC control
loop (that controls the power output) - it is quite with only the base K2,
but adding the KPA100 can cause the loop to overshoot and oscillate -
increasing R98 reduces the time constant of the loop and reduces the
overshoot.

Monitor the output on 10 meters during determining the maximum value for
R98 - too much resistance will reduce the maximum power output on the higher
bands, and yes you can compromise if you are willing to accept the lower
power on 10 meters.

73,
Don W3FPR

 -Original Message-

 No, that didn't help, Stewart. With the 100 PA disconnected and 5 watts
 requested, I see around 0.5 w difference in actual power and that
 is stable.

 Having re-connected the 100 w pa to restore the K2/100 to the state I
 would normally use it, I have put a scope on the output. With requested
 power of 50w, in Tune the readout shows 29w immediately, dropping to 24,
 21 and 17w, it then toggles between 17 and 22w. I can see this stepping
 on the waveform displayed  on my scope. It also explains what I was
 seeing the other night. Since I was working pile-up style, the overs
 would be short, so each time I went to transmit the power variation in
 the K2 would also vary drive to the amp with the consequent output
 variation of between 100 and 200 w from the amp.

 Chris G3SJJ

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Re: [Elecraft] K2/100 output variation

[G3SJJ]

Yes I understand Don. I was using the TUNE effect to demonstrate what I see.

I performed the following test on 40m with my 2 element phased array 
connected and an SWR of 1:1. Keying with a series of dashes, K2 output 
power of 34 watts initially dropped to 26w then toggled between 26 and 
34, this translated to an output power of  435w and 561w. With slightly 
more drive it oscillated between 42 and 50w producing about 670 and 830. 
The changeover time between the two levels is between 1 and 2 seconds.  
I didn't want to continuing QRMing the band so declined to check at full 
bore! (it is about 780w and 1kW for each state)


Someone emailed me directly and said he had changed **R99** to 1.1K, so 
now I am not sure whether to change R98 or R99??


73 Chris G3SJJ




Don Wilhelm wrote:

Chris,

You cannot make a sound judgement using TUNE.  Evaluate the R98 value change
with actual keying.  If you change bands or change the power level, it will
take a few dot times to settle into the new power setting, that part of your
observation is normal.

The rest of the situation is due to the loop response of the ALC control
loop (that controls the power output) - it is quite with only the base K2,
but adding the KPA100 can cause the loop to overshoot and oscillate -
increasing R98 reduces the time constant of the loop and reduces the
overshoot.

Monitor the output on 10 meters during determining the maximum value for
R98 - too much resistance will reduce the maximum power output on the higher
bands, and yes you can compromise if you are willing to accept the lower
power on 10 meters.

73,
Don W3FPR

  

-Original Message-

No, that didn't help, Stewart. With the 100 PA disconnected and 5 watts
requested, I see around 0.5 w difference in actual power and that
is stable.

Having re-connected the 100 w pa to restore the K2/100 to the state I
would normally use it, I have put a scope on the output. With requested
power of 50w, in Tune the readout shows 29w immediately, dropping to 24,
21 and 17w, it then toggles between 17 and 22w. I can see this stepping
on the waveform displayed  on my scope. It also explains what I was
seeing the other night. Since I was working pile-up style, the overs
would be short, so each time I went to transmit the power variation in
the K2 would also vary drive to the amp with the consequent output
variation of between 100 and 200 w from the amp.

Chris G3SJJ



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Re: [Elecraft] K2/100 output variation

[Don]

Sorry, that was my email  I should have said R98.

Don K7FJ

Someone emailed me directly and said he had changed **R99** to 1.1K, so 
now I am not sure whether to change R98 or R99??


73 Chris G3SJJ


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Re: [Elecraft] K2/100 output variation

[G3SJJ]

Yes thanks Don. R99 is also mentioned in  
http://www.elecraft.com/Apps/Power_Control_Mod.html so I was getting a 
bit confused!


73 Chris G3SJJ


Don wrote:

Sorry, that was my email  I should have said R98.

Don K7FJ

Someone emailed me directly and said he had changed **R99** to 1.1K, 
so now I am not sure whether to change R98 or R99??


73 Chris G3SJJ




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[Elecraft] K2 no output

[HR]

Finished my K2 a couple of days ago. At first TX output was allways full 
power. Adjustment via the front panel was not possible.
Now the rig does not transmit at all but shows elecraft when hitting 
the key for a moment.

Hard to do the rf-probing stuff with the transmitter out of action.

Regards Roger


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[Elecraft] K2 Audio Output

[Stephen W. Kercel]

Does the K2 produce sufficient audio power to drive a set of Bose 
Quiet Comfort 2 noise cancelling headphones?


Has anyone on the list tried Bose Quiet Comfort 2 noise cancelling 
headphones with a K2?


73

Steve Kercel
AA4AK


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RE: [Elecraft] K2 Audio Output

[Chuck Gehring]

Steve Kercel
AA4AK wrote:
Does the K2 produce sufficient audio power to drive a set of Bose
Quiet Comfort 2 noise cancelling headphones?

Has anyone on the list tried Bose Quiet Comfort 2 noise cancelling
headphones with a K2?

Steve,
I use the Bose QuietComfort 2 noise cancelling headphones all the time with
my K2.  They work great.

73 K2CG
Chuck Gehring
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