Re: [Elecraft] KPA/100 displays wrong PS current (much lower)

[Ioannis Kassotakis]

Don,
I think that the voltage drops to 13 V or lower at key down.
I will follow your advice.
Thanks again.

73,

Ioannis PA1EQP

On Monday, 25 April 2016, Don Wilhelm  wrote:

> Ioannis,
>
> Back the CAL CUR down to 3.50.
> It may be that you will have Hi Cur messages if you turn the POWER knob to
> full clockwise, but if you set the power control at 100 watts, that message
> should not appear.
>
> If it does, check the connections from the power supply to the K2/KPA100.
> If the voltage at the K2 (observe with the K2 voltage display) drops
> significantly during keydown, that could explain the Hi Cur warnings.
> Tighten the power supply terminals and check to be certain the APP
> connector is properly assembled with the connector blades fully inserted.
> If you look at the end of the APP connector and can see the spring blades
> that normally lock the contact blade, the contact blade has not been fully
> inserted and will not make full contact (and cause a significant voltage
> drop).
> If you can increase your power supply voltage to 14.3 volts or above, you
> should increase the voltage.  The K2 will operate with voltages up to 15
> volts.  For linearity and best transmit IMD, the higher the voltage, the
> better.
>
> 73,
> Don W3FPR
>
> On 4/24/2016 4:07 PM, Ioannis Kassotakis wrote:
>
>> Thanks Don,
>> I understand that the PS current reading is only for the Base K2.
>> I will rely on the bench PS display to read the 13.8 DC current.
>> I have already set the CAL CUR to 3.8 Amps so that I do not get HI CUR
>> alert at 10 Watts.
>>
>> 73,
>> Ioannis PA1EQP
>>
>>
>> On Sunday, 24 April 2016, Don Wilhelm  donw...@embarqmail.com>> wrote:
>>
>> The current display on the K2 is only for the current used by the
>> base K2.  I use it when testing the K2 for 'good health' and
>> normal RF Gain, but during operating I see no need to monitor it
>> on a regular basis.
>> The Base K2 will indicate Hi Cur if the current draw goes above
>> the value set by the CAL CUR parameter, and will reduce power if
>> that occurs.  Should you continue to get Hi Cur messages, that is
>> an indication of something that should be investigated.
>>
>> 73,
>> Don W3FPR
>>
>> On 4/24/2016 3:14 PM, Ioannis Kassotakis wrote:
>>
>> Thanks Don,
>> That means that at HI PWR (>11 Watts) should disregard the
>> displayed PS current figures.
>> I thought that KPA100 processor would communicate the I Sense
>> back to the MCU and display the correct current figure after
>> rescaling. I understand that is not the case.
>>
>> 73,
>>
>> Ioannis PA1EQP
>>
>> On Sunday, 24 April 2016, Don Wilhelm > > wrote:
>>
>> Ioannis,
>>
>> The current display on the K2 indicates only the current
>> for the
>> base K2, not for the K2 and KPA100 combination.
>> That is why you set the CAL CUR to 3.50 amps even though the
>> KPA100 will draw much more current.
>>
>> Yes, the KPA100 does have a scaling on the amount of RF
>> voltage
>> that is being detected.  That is used for power control
>> and has
>> nothing to do with the current displayed.  The result of that
>> voltage is sent to the VRFDET signal in the K2 (Voltage of
>> the RF
>> Detected).
>>
>> 73,
>> Don W3FPR
>>
>>
>>
>>
>> --
>> Ioannis Kassotakis
>>
>
>

-- 
Ioannis Kassotakis
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Re: [Elecraft] Poor band conditions? Try the SCAN function

[Wayne Burdick]

On Apr 24, 2016, at 8:42 PM, lstavenhagen  wrote:

> Yes, I use the scan function on both my K2's and my K3 and K3S. Next best
> thing to a panadapter available. 
> 
> One thing I have noticed about it on my K2 (and probably the K3 also), is it
> has two lengths of pauses - one which is just a few seconds and another
> about 30 secs or so. But which length of pause it uses on what type of
> signal it stops on seems a bit random. Sometimes it'll open up and pause on
> an actual CW signal for the short pause, but then the long 30 sec. pause on
> a continuous noise source. And sometimes the reverse.

I'll have a look at this when I get a chance.

tnx
Wayne
N6KR

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Re: [Elecraft] Smaller SP3 for KX3

[Wayne Burdick]

Hi Bruce,

I use the Chill Pills. Very compact, amplified, retractable cords, battery 
charged via a USB port, and decent sound, too.

73,
Wayne
N6KR


On Apr 24, 2016, at 10:38 PM, Bruce Nourish  wrote:

> Hi Elecraft folks,
> 
> To better inform my project list, is there a smaller version of the SP3 in
> the pipeline, sized to mach the KX3?
> 
> Bruce
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[Elecraft] Smaller SP3 for KX3

[Bruce Nourish]

Hi Elecraft folks,

To better inform my project list, is there a smaller version of the SP3 in
the pipeline, sized to mach the KX3?

Bruce
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Re: [Elecraft] Poor band conditions? Try the SCAN function

[lstavenhagen]

Yes, I use the scan function on both my K2's and my K3 and K3S. Next best
thing to a panadapter available. 

One thing I have noticed about it on my K2 (and probably the K3 also), is it
has two lengths of pauses - one which is just a few seconds and another
about 30 secs or so. But which length of pause it uses on what type of
signal it stops on seems a bit random. Sometimes it'll open up and pause on
an actual CW signal for the short pause, but then the long 30 sec. pause on
a continuous noise source. And sometimes the reverse.

Not a complaint, though I wonder if there's a way to specify a pause time
somewhere. forgive me if that's in the manual somewhere already...

And yes the bands have been nearly dead lately. Practically nothing on 20M
and up today, tho lots of stateside sigs on 30 and 40M

DM



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Re: [Elecraft] K3: Main RX gone deaf

[Ionut Pitu via Elecraft]

GM Udo,
What if you use your Rx IN port, is it the same thing?I've had the same problem 
a few weeks ago,almost no rx on ANT 1 or ANT2, normal rx on AUX-IN-SUB RX but 
normal rx on RX input from KXV3A and  it turned out to be D26 from the RF 
board.Give it a try:-).
Good luck!
BobYO8RNI


  From: Udo Langenohl - DK5YA 
 To: Elecraft@mailman.qth.net 
 Sent: Sunday, April 24, 2016 10:53 PM
 Subject: [Elecraft] K3: Main RX gone deaf
   
Gentleman,

I'm struggling with a Main RX vs. Sub RX issue. My Main RX is rather 
deaf compared to the Sub RX. I see at least 23.5dB attenuation between 
Main RX and Sub RX when comparing highly stable signals from my signal 
generator (HP8664A). This is only for ANT1/2 vs. AUX-IN!
Example:
-33dBm on 28.500
into AUX-IN (SUB RX): exactly 59 +40dB
into ANT 1 (Main RX): 59 +15dB
into ANT 2 (Main RX): 59 +15dB

I've checked all the usual suspects (pin diodes):
D1 and D5 on the KXV3A: o.k.
Each and every pin diode on the SUB IN board: o.k.
D5 on the Main RX board: o.k.

This is a K3 #59xx with almost everything inside money can buy.

My second K3 (serial #39xx) does not show this strange behavior. Main RX 
and SUB RX show exactly the same values on ANT1/2 and AUX IN. -33dBm is 
59+40 on MAIN and SUB RX, no matter if Ant1, 2 or AUX IN.

Any idea? I'm searching for weeks now and I'm close to give up.

Udo, DK5YA
-- 
**
Webs by DK5YA:                          *
http://www.mmmonvhf.de/         [editor]*
http://www.vhfdx.de/             [owner] *
http://www.palekastro.de/       [owner] *
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http://www.spessartwetter.de/   [owner] *
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Re: [Elecraft] Poor band conditions? Try the SCAN function

[Gary Smith]

The bands have indeed been in lousy shape lately; There was a SP RTTY 
contest on this weekend and I made two QSOs on 21 MHz, zero on 28 MHz 
and around 130 of them on 20M & 40M. Only three Q's on 80M. The bands 
were just lousy.

While the bands just aren't good at all right now, thanks for the 
reminder of that excellent "search" feature. Thanks to the beauty of 
the P3, I use that to find where there's "life" on the bands but sans 
P3, the search is golden.

73,

Gary
KA1J


> Here in Northern California, at least at my QTH, the bands seem to be in very 
> poor shape. (It doesn't help that my OCF dipole has one leg on the ground due 
> to high winds.)
> 
> At times like this, the SCAN function available on most Elecraft transceivers 
> can help you find signals you might otherwise miss. SCAN does the work for 
> you while you check your email, play chess, re-read The Lord of the Rings, 
> shave, etc. 
> 
> When a signal pops up, scanning stops, and the receiver unmutes briefly so 
> you can consider the signal's worthiness. As you'll discover, bands that were 
> "dead" may not be, in reality. My favorite band for this sort of thing is 15 
> meters, in the late afternoon. A minute or two after starting a scan, you may 
> hear DX appear from out of nowhere.
> 
> For specific instructions for your rig, check the table of contents in the 
> owner's manual. 
> 
> Here a few general tips:
> 
> - use a narrow filter passband when possible, especially if the band is noisy
> 
> - the tuning RATE in effect when scan starts determines how long it takes
>   to scan the selected segment; finer-tuning slows things down, and may result
>   in detection of weaker signals
> 
> - if the band is noisy (QRN), the SCAN function may unmute too frequently; try
>   using the noise blanker
> 
> 73,
> Wayne
> N6KR
> 
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Re: [Elecraft] Poor band conditions? Try the SCAN function

[Rose]

There was a large solar "event" a few days ago.  (;-(

73

K0PP
On Apr 24, 2016 6:44 PM, "Wayne Burdick"  wrote:

> Here in Northern California, at least at my QTH, the bands seem to be in
> very poor shape. (It doesn't help that my OCF dipole has one leg on the
> ground due to high winds.)
>
> At times like this, the SCAN function available on most Elecraft
> transceivers can help you find signals you might otherwise miss. SCAN does
> the work for you while you check your email, play chess, re-read The Lord
> of the Rings, shave, etc.
>
> When a signal pops up, scanning stops, and the receiver unmutes briefly so
> you can consider the signal's worthiness. As you'll discover, bands that
> were "dead" may not be, in reality. My favorite band for this sort of thing
> is 15 meters, in the late afternoon. A minute or two after starting a scan,
> you may hear DX appear from out of nowhere.
>
> For specific instructions for your rig, check the table of contents in the
> owner's manual.
>
> Here a few general tips:
>
> - use a narrow filter passband when possible, especially if the band is
> noisy
>
> - the tuning RATE in effect when scan starts determines how long it takes
>   to scan the selected segment; finer-tuning slows things down, and may
> result
>   in detection of weaker signals
>
> - if the band is noisy (QRN), the SCAN function may unmute too frequently;
> try
>   using the noise blanker
>
> 73,
> Wayne
> N6KR
>
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[Elecraft] Poor band conditions? Try the SCAN function

[Wayne Burdick]

Here in Northern California, at least at my QTH, the bands seem to be in very 
poor shape. (It doesn't help that my OCF dipole has one leg on the ground due 
to high winds.)

At times like this, the SCAN function available on most Elecraft transceivers 
can help you find signals you might otherwise miss. SCAN does the work for you 
while you check your email, play chess, re-read The Lord of the Rings, shave, 
etc. 

When a signal pops up, scanning stops, and the receiver unmutes briefly so you 
can consider the signal's worthiness. As you'll discover, bands that were 
"dead" may not be, in reality. My favorite band for this sort of thing is 15 
meters, in the late afternoon. A minute or two after starting a scan, you may 
hear DX appear from out of nowhere.

For specific instructions for your rig, check the table of contents in the 
owner's manual. 

Here a few general tips:

- use a narrow filter passband when possible, especially if the band is noisy

- the tuning RATE in effect when scan starts determines how long it takes
  to scan the selected segment; finer-tuning slows things down, and may result
  in detection of weaker signals

- if the band is noisy (QRN), the SCAN function may unmute too frequently; try
  using the noise blanker

73,
Wayne
N6KR

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Re: [Elecraft] PBSK31

[Don Wilhelm]

Phil and all,

Yes, those mods can do a lot for temperature stability of the K2. Adjust 
the Thermistor board RA value if necessary to achieve the best stability.
The KX3 can achieve good temperature stability if the Extended 
Temperature Compensation procedure is completed - I would not attempt 
any of the JT data modes without doing that first.


73,
Don W3FPR

On 4/24/2016 7:28 PM, Phil Wheeler wrote:
I've done all those mods to #380, Don. I didn't realize they were that 
effective!  And after reading of thermal stability issues some have 
had in JT65 (e.g., using a KX3) I assumed the K2/10 would have even 
larger issues in those modes, given the age of the design.


Your message is good news indeed!

73, Phil W7OX



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Re: [Elecraft] PBSK31

[Phil Wheeler]

I've done all those mods to #380, Don. I didn't 
realize they were that effective!  And after 
reading of thermal stability issues some have had 
in JT65 (e.g., using a KX3) I assumed the K2/10 
would have even larger issues in those modes, 
given the age of the design.


Your message is good news indeed!

73, Phil W7OX

On 4/24/16 3:52 PM, Don Wilhelm wrote:

Phil,

I cannot say if David did anything special for 
frequency stability, but any K2 above SN 3000 
had the BFO stability mod and the PLL 
Temperature compensation mod installed which can 
achieve the necessary stability.  K2s below SN 
3000 can be upgraded with those upgrade kits.


The stock PLL Temperature Stability Mod has 
resistor RA as a 33k resistor.  That resistor 
value can be modified to achieve closer 
temperature stability for any particular K2.  
The K2 manual does not contain information about 
how to vary and check the compensation, but that 
information is contained in the instructions for 
the PLL Temperature Stability Mod - download 
from Elecraft.


The temperature change in the K2/10 is not 
likely to be very much even for long periods of 
transmit because the PA transistors and heatsink 
are not close to the VFO/PLL and BFO areas and 
there is a lot of 'air space' inside the enclosure.
With the KPA100 added, that air space is much 
more confined and the heat from the KPA100 PA 
transistors will have an influence.
In other words, while the stock K2/10 may be 
sufficiently stable, the K2/100 may need some 
'tweaking' of the RA resistor value for 
equivalent stability.


73,
Don W3FPR

On 4/24/2016 6:23 PM, Phil Wheeler wrote:

David,

Do you do anything special to ensure frequency 
stability in those modes with your K2?


Phil W7OX

On 4/24/16 3:02 PM, David Giles wrote:
I've made hundreds of contacts using JT65 and 
JT9 with my K2 at 5W. Most of these portable 
on a 12v battery with solar charging. With a 
48 second transmit period, it's probably more 
of a stress test than BPSK31.


73 de David VK5DG / VK3TUN





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Re: [Elecraft] KPA/100 displays wrong PS current (much lower)

[Don Wilhelm]

Ioannis,

Back the CAL CUR down to 3.50.
It may be that you will have Hi Cur messages if you turn the POWER knob 
to full clockwise, but if you set the power control at 100 watts, that 
message should not appear.


If it does, check the connections from the power supply to the 
K2/KPA100.  If the voltage at the K2 (observe with the K2 voltage 
display) drops significantly during keydown, that could explain the Hi 
Cur warnings. Tighten the power supply terminals and check to be certain 
the APP connector is properly assembled with the connector blades fully 
inserted.  If you look at the end of the APP connector and can see the 
spring blades that normally lock the contact blade, the contact blade 
has not been fully inserted and will not make full contact (and cause a 
significant voltage drop).
If you can increase your power supply voltage to 14.3 volts or above, 
you should increase the voltage.  The K2 will operate with voltages up 
to 15 volts.  For linearity and best transmit IMD, the higher the 
voltage, the better.


73,
Don W3FPR

On 4/24/2016 4:07 PM, Ioannis Kassotakis wrote:

Thanks Don,
I understand that the PS current reading is only for the Base K2.
I will rely on the bench PS display to read the 13.8 DC current.
I have already set the CAL CUR to 3.8 Amps so that I do not get HI CUR 
alert at 10 Watts.


73,
Ioannis PA1EQP


On Sunday, 24 April 2016, Don Wilhelm > wrote:


The current display on the K2 is only for the current used by the
base K2.  I use it when testing the K2 for 'good health' and
normal RF Gain, but during operating I see no need to monitor it
on a regular basis.
The Base K2 will indicate Hi Cur if the current draw goes above
the value set by the CAL CUR parameter, and will reduce power if
that occurs.  Should you continue to get Hi Cur messages, that is
an indication of something that should be investigated.

73,
Don W3FPR

On 4/24/2016 3:14 PM, Ioannis Kassotakis wrote:

Thanks Don,
That means that at HI PWR (>11 Watts) should disregard the
displayed PS current figures.
I thought that KPA100 processor would communicate the I Sense
back to the MCU and display the correct current figure after
rescaling. I understand that is not the case.

73,

Ioannis PA1EQP

On Sunday, 24 April 2016, Don Wilhelm > wrote:

Ioannis,

The current display on the K2 indicates only the current
for the
base K2, not for the K2 and KPA100 combination.
That is why you set the CAL CUR to 3.50 amps even though the
KPA100 will draw much more current.

Yes, the KPA100 does have a scaling on the amount of RF
voltage
that is being detected.  That is used for power control
and has
nothing to do with the current displayed.  The result of that
voltage is sent to the VRFDET signal in the K2 (Voltage of
the RF
Detected).

73,
Don W3FPR




--
Ioannis Kassotakis


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Re: [Elecraft] PBSK31

[Don Wilhelm]

Phil,

I cannot say if David did anything special for frequency stability, but 
any K2 above SN 3000 had the BFO stability mod and the PLL Temperature 
compensation mod installed which can achieve the necessary stability.  
K2s below SN 3000 can be upgraded with those upgrade kits.


The stock PLL Temperature Stability Mod has resistor RA as a 33k 
resistor.  That resistor value can be modified to achieve closer 
temperature stability for any particular K2.  The K2 manual does not 
contain information about how to vary and check the compensation, but 
that information is contained in the instructions for the PLL 
Temperature Stability Mod - download from Elecraft.


The temperature change in the K2/10 is not likely to be very much even 
for long periods of transmit because the PA transistors and heatsink are 
not close to the VFO/PLL and BFO areas and there is a lot of 'air space' 
inside the enclosure.
With the KPA100 added, that air space is much more confined and the heat 
from the KPA100 PA transistors will have an influence.
In other words, while the stock K2/10 may be sufficiently stable, the 
K2/100 may need some 'tweaking' of the RA resistor value for equivalent 
stability.


73,
Don W3FPR

On 4/24/2016 6:23 PM, Phil Wheeler wrote:

David,

Do you do anything special to ensure frequency stability in those 
modes with your K2?


Phil W7OX

On 4/24/16 3:02 PM, David Giles wrote:
I've made hundreds of contacts using JT65 and JT9 with my K2 at 5W. 
Most of these portable on a 12v battery with solar charging. With a 
48 second transmit period, it's probably more of a stress test than 
BPSK31.


73 de David VK5DG / VK3TUN


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[Elecraft] WTB TXCO, freq ref & filters

[Gary Smith]

Hello folks,

I'm looking to find a: 

KTCXO3-1 TCXO 1 PPM that is excess to 
someone's needs. I just bought a backup 
rig for my K3s (I bought an older k3) and 
want to have it set up like my K3 was.

I'm also looking for a: 

K3EXREF Ext. Frequency Reference Input 
that is excess as well, to go with the 
KTCXO3-1.

I would like to also find a 

KFL3A-400 400 Hz, 8-pole filter as well as 
a:

KFL3A-1.8K 1.8 kHz, 8-pole filter.

Depending on the price, a:
KFL3A-2.8K 2.8 kHz filter as well.

If you have any of these gems, please 
contact me off list.

Thanks!

73,

Gary
KA1J





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Re: [Elecraft] PBSK31

[Phil Wheeler]

David,

Do you do anything special to ensure frequency 
stability in those modes with your K2?


Phil W7OX

On 4/24/16 3:02 PM, David Giles wrote:
I've made hundreds of contacts using JT65 and 
JT9 with my K2 at 5W. Most of these portable on 
a 12v battery with solar charging. With a 48 
second transmit period, it's probably more of a 
stress test than BPSK31.


73 de David VK5DG / VK3TUN

On 24/04/2016 2:07 PM, Bruce Rattray wrote:
What is the safe level to operate the K2 at for 
the PBSK31 mode?  I'm

thinking 2 or 3 watts.  tnx 73 Bruce ve5rc


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Re: [Elecraft] PBSK31

[David Giles]

I've made hundreds of contacts using JT65 and JT9 with my K2 at 5W.  
Most of these portable on a 12v battery with solar charging. With a 48 
second transmit period, it's probably more of a stress test than BPSK31.


73 de David VK5DG / VK3TUN

On 24/04/2016 2:07 PM, Bruce Rattray wrote:

What is the safe level to operate the K2 at for the PBSK31 mode?  I'm
thinking 2 or 3 watts.  tnx 73 Bruce ve5rc

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Re: [Elecraft] K3: Main RX gone deaf

[Gary Smith]

Udo,

I'm not one of the more knowledgeable 
people on the list and hopefully, somebody 
with better knowledge than me helps you 
more. But with that, this is what I would 
look at if it were my radio...

1. Are your crystal filters set up 
properly; Could they be in reverse order 
between slots 1-5 on the main board and 
sub receiver? 

If they are in the identical order, have 
you set the K3 up to know what crystals 
are in there and, do you have the order of 
the crystals correct using the K3 Utility? 
If you have one bank listed opposite in 
the filter configuration, this will not 
work properly.

2. When Using B set; do you have the 
filters set the same on both Sub & main? 

Do you have the antennas set properly for 
the main as well as sub Rx? Could your 
main antenna for RX be listening to the 
wrong antenna?

It's good you have two K3's: What you 
might do is have both of the K3's you 
have, side by side and check each setting, 
comparing the known good one to the 
settings on the one you're having trouble 
with. 

3. Have you tried your good radio in place 
of your K3 that has the issues? 
Conversely, have you tried your problem K3 
in the location your good K3 is? Perhaps 
there is a problem with the coax or 
antenna connections?

Hopefully you will find your answer 
without having to have anything repaired.

73 & Happy hunting,

Gary
KA1J

> Gentleman,
> 
> I'm struggling with a Main RX vs. Sub RX issue. My Main RX is rather 
> deaf compared to the Sub RX. I see at least 23.5dB attenuation between 
> Main RX and Sub RX when comparing highly stable signals from my signal 
> generator (HP8664A). This is only for ANT1/2 vs. AUX-IN!
> Example:
> -33dBm on 28.500
> into AUX-IN (SUB RX): exactly 59 +40dB
> into ANT 1 (Main RX): 59 +15dB
> into ANT 2 (Main RX): 59 +15dB
> 
> I've checked all the usual suspects (pin diodes):
> D1 and D5 on the KXV3A: o.k.
> Each and every pin diode on the SUB IN board: o.k.
> D5 on the Main RX board: o.k.
> 
> This is a K3 #59xx with almost everything inside money can buy.
> 
> My second K3 (serial #39xx) does not show this strange behavior. Main RX 
> and SUB RX show exactly the same values on ANT1/2 and AUX IN. -33dBm is 
> 59+40 on MAIN and SUB RX, no matter if Ant1, 2 or AUX IN.
> 
> Any idea? I'm searching for weeks now and I'm close to give up.
> 
> Udo, DK5YA
> -- 
> **
> Webs by DK5YA:   *
> http://www.mmmonvhf.de/  [editor]*
> http://www.vhfdx.de/ [owner] *
> http://www.palekastro.de/[owner] *
> http://www.solweb.de/[owner] *
> http://www.spessartwetter.de/[owner] *
> **
> 
> __
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> 




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Re: [Elecraft] K3: Main RX gone deaf

[Gary Smith]

Udo,

I'm not one of the more knowledgeable 
people on the list and hopefully, somebody 
with better knowledge than me helps you 
more. But with that, this is what I would 
look at if it were my radio...

1. Are your crystal filters set up 
properly; Could they be in reverse order 
between slots 1-5 on the main board and 
sub receiver? 

If they are in the identical order, have 
you set the K3 up to know what crystals 
are in there and, do you have the order of 
the crystals correct using the K3 Utility? 
If you have one bank listed opposite in 
the filter configuration, this will not 
work properly.

2. When Using B set; do you have the 
filters set the same on both Sub & main? 

Do you have the antennas set properly for 
the main as well as sub Rx? Could your 
main antenna for RX be listening to the 
wrong antenna?

It's good you have two K3's: What you 
might do is have both of the K3's you 
have, side by side and check each setting, 
comparing the known good one to the 
settings on the one you're having trouble 
with. 

3. Have you tried your good radio in place 
of your K3 that has the issues? 
Conversely, have you tried your problem K3 
in the location your good K3 is? Perhaps 
there is a problem with the coax or 
antenna connections?

Hopefully you will find your answer 
without having to have anything repaired.

73 & Happy hunting,

Gary
KA1J

> Gentleman,
> 
> I'm struggling with a Main RX vs. Sub RX issue. My Main RX is rather 
> deaf compared to the Sub RX. I see at least 23.5dB attenuation between 
> Main RX and Sub RX when comparing highly stable signals from my signal 
> generator (HP8664A). This is only for ANT1/2 vs. AUX-IN!
> Example:
> -33dBm on 28.500
> into AUX-IN (SUB RX): exactly 59 +40dB
> into ANT 1 (Main RX): 59 +15dB
> into ANT 2 (Main RX): 59 +15dB
> 
> I've checked all the usual suspects (pin diodes):
> D1 and D5 on the KXV3A: o.k.
> Each and every pin diode on the SUB IN board: o.k.
> D5 on the Main RX board: o.k.
> 
> This is a K3 #59xx with almost everything inside money can buy.
> 
> My second K3 (serial #39xx) does not show this strange behavior. Main RX 
> and SUB RX show exactly the same values on ANT1/2 and AUX IN. -33dBm is 
> 59+40 on MAIN and SUB RX, no matter if Ant1, 2 or AUX IN.
> 
> Any idea? I'm searching for weeks now and I'm close to give up.
> 
> Udo, DK5YA
> -- 
> **
> Webs by DK5YA:   *
> http://www.mmmonvhf.de/  [editor]*
> http://www.vhfdx.de/ [owner] *
> http://www.palekastro.de/[owner] *
> http://www.solweb.de/[owner] *
> http://www.spessartwetter.de/[owner] *
> **
> 
> __
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> Please help support this email list: http://www.qsl.net/donate.html
> Message delivered to g...@ka1j.com
> 



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Re: [Elecraft] KPA/100 displays wrong PS current (much lower)

[Ioannis Kassotakis]

Thanks Don,
I understand that the PS current reading is only for the Base K2.
I will rely on the bench PS display to read the 13.8 DC current.
I have already set the CAL CUR to 3.8 Amps so that I do not get HI CUR
alert at 10 Watts.

73,
Ioannis PA1EQP


On Sunday, 24 April 2016, Don Wilhelm  wrote:

> The current display on the K2 is only for the current used by the base
> K2.  I use it when testing the K2 for 'good health' and normal RF Gain, but
> during operating I see no need to monitor it on a regular basis.
> The Base K2 will indicate Hi Cur if the current draw goes above the value
> set by the CAL CUR parameter, and will reduce power if that occurs.  Should
> you continue to get Hi Cur messages, that is an indication of something
> that should be investigated.
>
> 73,
> Don W3FPR
>
> On 4/24/2016 3:14 PM, Ioannis Kassotakis wrote:
>
>> Thanks Don,
>> That means that at HI PWR (>11 Watts) should disregard the displayed PS
>> current figures.
>> I thought that KPA100 processor would communicate the I Sense back to the
>> MCU and display the correct current figure after rescaling. I understand
>> that is not the case.
>>
>> 73,
>>
>> Ioannis PA1EQP
>>
>> On Sunday, 24 April 2016, Don Wilhelm  donw...@embarqmail.com>> wrote:
>>
>> Ioannis,
>>
>> The current display on the K2 indicates only the current for the
>> base K2, not for the K2 and KPA100 combination.
>> That is why you set the CAL CUR to 3.50 amps even though the
>> KPA100 will draw much more current.
>>
>> Yes, the KPA100 does have a scaling on the amount of RF voltage
>> that is being detected.  That is used for power control and has
>> nothing to do with the current displayed.  The result of that
>> voltage is sent to the VRFDET signal in the K2 (Voltage of the RF
>> Detected).
>>
>> 73,
>> Don W3FPR
>>
>>
>

-- 
Ioannis Kassotakis
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Re: [Elecraft] KPA/100 displays wrong PS current (much lower)

[Don Wilhelm]

The current display on the K2 is only for the current used by the base 
K2.  I use it when testing the K2 for 'good health' and normal RF Gain, 
but during operating I see no need to monitor it on a regular basis.
The Base K2 will indicate Hi Cur if the current draw goes above the 
value set by the CAL CUR parameter, and will reduce power if that 
occurs.  Should you continue to get Hi Cur messages, that is an 
indication of something that should be investigated.


73,
Don W3FPR

On 4/24/2016 3:14 PM, Ioannis Kassotakis wrote:

Thanks Don,
That means that at HI PWR (>11 Watts) should disregard the displayed 
PS current figures.
I thought that KPA100 processor would communicate the I Sense back to 
the MCU and display the correct current figure after rescaling. I 
understand that is not the case.


73,

Ioannis PA1EQP

On Sunday, 24 April 2016, Don Wilhelm > wrote:


Ioannis,

The current display on the K2 indicates only the current for the
base K2, not for the K2 and KPA100 combination.
That is why you set the CAL CUR to 3.50 amps even though the
KPA100 will draw much more current.

Yes, the KPA100 does have a scaling on the amount of RF voltage
that is being detected.  That is used for power control and has
nothing to do with the current displayed.  The result of that
voltage is sent to the VRFDET signal in the K2 (Voltage of the RF
Detected).

73,
Don W3FPR



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[Elecraft] K3: Main RX gone deaf

[Udo Langenohl - DK5YA]

Gentleman,

I'm struggling with a Main RX vs. Sub RX issue. My Main RX is rather 
deaf compared to the Sub RX. I see at least 23.5dB attenuation between 
Main RX and Sub RX when comparing highly stable signals from my signal 
generator (HP8664A). This is only for ANT1/2 vs. AUX-IN!

Example:
-33dBm on 28.500
into AUX-IN (SUB RX): exactly 59 +40dB
into ANT 1 (Main RX): 59 +15dB
into ANT 2 (Main RX): 59 +15dB

I've checked all the usual suspects (pin diodes):
D1 and D5 on the KXV3A: o.k.
Each and every pin diode on the SUB IN board: o.k.
D5 on the Main RX board: o.k.

This is a K3 #59xx with almost everything inside money can buy.

My second K3 (serial #39xx) does not show this strange behavior. Main RX 
and SUB RX show exactly the same values on ANT1/2 and AUX IN. -33dBm is 
59+40 on MAIN and SUB RX, no matter if Ant1, 2 or AUX IN.


Any idea? I'm searching for weeks now and I'm close to give up.

Udo, DK5YA
--
**
Webs by DK5YA:   *
http://www.mmmonvhf.de/  [editor]*
http://www.vhfdx.de/ [owner] *
http://www.palekastro.de/[owner] *
http://www.solweb.de/[owner] *
http://www.spessartwetter.de/[owner] *
**

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[Elecraft] For Sale: KX3/PX3/Begali Adventure Key/Accessories

[Roger Marrotte]

The complete package has been sold, pending receipt of funds.

 

Roger, W1EM

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Re: [Elecraft] KPA/100 displays wrong PS current (much lower)

[Ioannis Kassotakis]

Thanks Don,
That means that at HI PWR (>11 Watts) should disregard the displayed PS
current figures.
I thought that KPA100 processor would communicate the I Sense back to the
MCU and display the correct current figure after rescaling. I understand
that is not the case.

73,

Ioannis PA1EQP

On Sunday, 24 April 2016, Don Wilhelm  wrote:

> Ioannis,
>
> The current display on the K2 indicates only the current for the base K2,
> not for the K2 and KPA100 combination.
> That is why you set the CAL CUR to 3.50 amps even though the KPA100 will
> draw much more current.
>
> Yes, the KPA100 does have a scaling on the amount of RF voltage that is
> being detected.  That is used for power control and has nothing to do with
> the current displayed.  The result of that voltage is sent to the VRFDET
> signal in the K2 (Voltage of the RF Detected).
>
> 73,
> Don W3FPR
>
> On 4/24/2016 12:05 PM, Ioannis Kassotakis wrote:
>
>> Just finished building the KPA-100 for my S/N 2102 K2 (MCU v. 2.03D, KPA
>> 1.06)
>> The K2/100 does not display the correct 13.8 V power supply current (by
>> taping Display) when it switches to HI POWER (>10 Watts).
>> I used a DMM in series to accurately measure the PS supplied current while
>> checking the K2 display at several power settings . Later, I also measured
>> the KPA TP1 voltage which is the I sense input to the KPA-100 processor.
>> For several power settings I got:
>> PWR (Watts) - PS Current (DMM) Amps - K2 Current Display Amps - KPA/100
>> TP1
>> (mV)
>> RX-0.4 - 0.44 - 0 
>> 1.0- 1.72- 1.76 -0
>> 5.0 - 3.3-3.3 - 0
>> 10- 3.8 - 3.8 - 0
>> 15- 4.5 - 1.01 - Not measured
>> 20- 5.4 - 1.02 - 100
>> 40 - 7.0 - 1.20 - 250
>> 60 - 8.5 - 1.28 -380
>> 80 - 9.5 - 1.41 - 500
>> 100 - 10.3 - 1.48 - 580
>> 111 - 10.8 - 1.54 - N/A
>> The measurements were done at 40 m (7.100) at CW to a dummy load through
>> KAT-100.
>>
>> It seems to work fine a LO PWR (<11 Watts) but appears to have a scaling
>> issue, when the PA switches On to HI PWR mode.
>> According to the schem (p.61) I Sense is supposed to vary 0-5 V for 0-32
>> A,
>> so the TP1 figures seem to be rather low.
>> Is this a known issue? Is it possible that I have a failed U7 or Q5 ?
>>
>>
>>
>

-- 
Ioannis Kassotakis
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[Elecraft] K2 freq stability

[lstavenhagen]

Agreed, though on my most recent K2, it was close enough to actually change
the BFO freq slightly even after releasing the pressure of my hand on the
cover, etc., when I picked it up and moved it around.

Course we're talking, like, fractions of a millimeter almost lol. I think
just the small warp in the RF board and maybe in the bottom cover are just
enough to get the panel close enough to the toroid and BFO area to make this
happen on my recent K2. I was extremely careful with the bumper and
positioning of the resistor and it was still mechanically too close to the
panel (I could see the slight divet in the electrical tape when I'd take the
cover off, but I never saw that on my first K2).

But even K2 #1 pulls the BFO a little when I handle it pressing on the
bottom cover with the rig on. Just not nearly as bad as #2

But just the thickness of a lockwasher was enough to spread things out for a
great improvement...

Definitely not a "problem" problem, but, er,...How about a "very very close
tolerance mechanical issue with L33 and the bottom cover", I'll put it that
way lol.

73,
LS
W5QD



--
View this message in context: 
http://elecraft.365791.n2.nabble.com/K2-freq-stability-tp7616601p7616620.html
Sent from the Elecraft mailing list archive at Nabble.com.
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Re: [Elecraft] K3 frequency memory labels missing

[Brendon Whateley]

Sounds like time to call or email Elecraft support. They often can resolve
stuff like this really quickly.

- Brendon

On Sun, Apr 24, 2016 at 8:21 AM, Jim McDonald  wrote:

> Just did that, Dick, and no change.
>
> 73, Jim N7US
>
>
>
> -Original Message-
>
>
> You need to install all the files that came with that firmware version. The
> FPF file and MCU file are coordinated.
>
> Try installing all firmware instead of just the MCU.
>
> 73 de Dick, K6KR
>
>
> -Original Message-
>
> I don't know if it's related to updating my K3 with MCU 05.38, but I now
> have a problem with the display.
>
> After pressing M->V, the VFO B displays gibberish for all memories rather
> than the label assigned in the Frequency Memory Editor program.
>
> 73, Jim N7US
>
>
>
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Re: [Elecraft] K2 freq stability

[Don Wilhelm]

LS,

That is not usually a problem if the rubber mounting stem has been cut 
off as instructed and the 1/8 watt resistor is pushed down inside the 
toroid core (so the core cannot move).


One does not usually manipulate the bottom cover during operation, so 
the only time the BFO is liable to shift is when pressure is placed on 
the bottom cover.
That is not 'drift' IMHO, but a change because of the physical proximity 
of the bottom cover.


73,
Don W3FPR

On 4/24/2016 9:31 AM, lstavenhagen wrote:

Hi all,
Here's an interesting finding, though I apologize if this is already in the
past archives.

No matter how careful you are when installing L33 on the bottom of the
board, it's so close to the bottom cover that any movement of it, say when
you're picking up the rig or manipulating the bale, etc., will pull the BFO.
On my 2nd K2 that I just completed it was so bad that I could pick up the
rig, set it back down and the tone of signals was very slightly, but
noticeably off.

So what I did was put a lockwasher between the cover and the standoff near
L33 to raise the cover a little bit and get it the heck away from L33 as
much as I could. It actually made a large improvement in the general
frequency stability of the rig - which means before I was seeing more
contributions in overall drift from the BFO in addition to the rest of the
circuitry.

The washer is an ugly fix, since the cover bows out a little bit, but it's
totally non-destructive and reversible. I did the same fix to my other K2
which didn't have the problem to the same degree, but it helped on that one
too.

Fortunately the slightly bowed out bottom cover is under the rig and you
never see it. But just in case you've been experiencing more drift in your
K2 than you think you should get, or it pulls when you pick it up that's
a fix that is working on mine.




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[Elecraft] Fwd: KPAK3AUX Cable Set

[Richard Thorne]

Sold.

Rich - N5ZC

 Forwarded Message 
Subject:[Elecraft] KPAK3AUX Cable Set
Date:   Sat, 23 Apr 2016 17:14:11 -0500
From:   Richard Thorne 
To: Elecraft Reflector 



I have the KPAK3AUX cable set available.

As pictured here:
http://www.elecraft.com/manual/KPAK3AUX%20Cable%20Set%20Instructions.pdf

$22 shipped priority

Rich - N5ZC

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Re: [Elecraft] Building K2 SSB unit KSB2 version E

[Don Wilhelm]

William,

I hate it when a builder does that and then I have to repair it later in 
its life - only because the bypass jumpers I have should I need to 
remove the KSB2 for test purposes do not work.


Other than that aspect, it will cause no operational problems.
There is a greater chance of the male pins to become bent if they are on 
the RF board, and if they should, they are harder to straighten than 
male pins on the option board.


If you have *good* desoldering equipment available, I would change them, 
but lacking that, leave them as-is.


73,
Don W3FPR

On 4/24/2016 12:36 PM, will...@zendamateur.nl wrote:

Hi every body,

  


Posted some messages, and love the way the list works.

Sorry about my English last message was just thinking on paper and that
ended in some comments :)

  


I bought the K2 ¼ already build, looked good so I took the risk…

  


Now wat I noticed having finished today the RF board, is that the previous
builder reversed the connectors J9 J10 and J11 he installed the mail side on
the RF board, and the female on the KSB2 board.

  


I don’t think there will be a divergence.




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Re: [Elecraft] KPA/100 displays wrong PS current (much lower)

[Don Wilhelm]

Ioannis,

The current display on the K2 indicates only the current for the base 
K2, not for the K2 and KPA100 combination.
That is why you set the CAL CUR to 3.50 amps even though the KPA100 will 
draw much more current.


Yes, the KPA100 does have a scaling on the amount of RF voltage that is 
being detected.  That is used for power control and has nothing to do 
with the current displayed.  The result of that voltage is sent to the 
VRFDET signal in the K2 (Voltage of the RF Detected).


73,
Don W3FPR

On 4/24/2016 12:05 PM, Ioannis Kassotakis wrote:

Just finished building the KPA-100 for my S/N 2102 K2 (MCU v. 2.03D, KPA
1.06)
The K2/100 does not display the correct 13.8 V power supply current (by
taping Display) when it switches to HI POWER (>10 Watts).
I used a DMM in series to accurately measure the PS supplied current while
checking the K2 display at several power settings . Later, I also measured
the KPA TP1 voltage which is the I sense input to the KPA-100 processor.
For several power settings I got:
PWR (Watts) - PS Current (DMM) Amps - K2 Current Display Amps - KPA/100 TP1
(mV)
RX-0.4 - 0.44 - 0 
1.0- 1.72- 1.76 -0
5.0 - 3.3-3.3 - 0
10- 3.8 - 3.8 - 0
15- 4.5 - 1.01 - Not measured
20- 5.4 - 1.02 - 100
40 - 7.0 - 1.20 - 250
60 - 8.5 - 1.28 -380
80 - 9.5 - 1.41 - 500
100 - 10.3 - 1.48 - 580
111 - 10.8 - 1.54 - N/A
The measurements were done at 40 m (7.100) at CW to a dummy load through
KAT-100.

It seems to work fine a LO PWR (<11 Watts) but appears to have a scaling
issue, when the PA switches On to HI PWR mode.
According to the schem (p.61) I Sense is supposed to vary 0-5 V for 0-32 A,
so the TP1 figures seem to be rather low.
Is this a known issue? Is it possible that I have a failed U7 or Q5 ?




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[Elecraft] Elecraft CW Net Announcement

[kev...@coho.net]

Hello,
Propagation has been in decline for the last few weeks. Currently 
the flux is at 79 sfu.  I have best results when this number is over 
100.  The reverse beacon net on 20 and 30 meters gave no results.  
Hopefully by this afternoon conditions will have marginally improved.
Weather has been all over with a temperature range from the low 40s 
to the mid 80s during the day.  On Friday night the skies just opened up 
with a fifteen minute deluge.  Then came another fifteen minutes of a 
lightning show.  Nothing like the standard Midwestern thunderstorm but 
it was pretty good for the Pacific Northwest.
   I have built another antenna so when I have my K3 repaired I'll be 
able to test conditions from multiple angles.  It is another doublet cut 
for around 160 meters which will be at right angles to the first one.  I 
plan to install it as a V but with that much wire it's tough to get the 
center up high enough to make the angle small enough.  Ninety feet is 
about the limit on the wrist rocket - fishing line - sinker system I 
employ.  That leaves at least forty feet of wasted tree height.


Please join us at:
14050 kHz at 2200z Sunday (3 PM PDT Sunday)
 7045 kHz at 0100z Monday (6 PM PDT Sunday)

73,
   Kevin. KD5ONS

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[Elecraft] For Sale: KX3/PX3/Begali Adventure Key/Accessories

[Roger Marrotte]

I'm selling my KX3 and PX3.  I purchased them last year in the fall.  They
have seldom been used.  They look and work like new.  The following items
are included:

 

KX3 serial #8212

PX3 serial #1493

KXFL3 Internal Dual-Passband Roofing Filter

KXAT3 Internal, 20-W Automatic Antenna Tuner

KXBC3 Internal NiMH Charger / Real-Time Clock

SMA-RA   SMA M-F Right Angle Adapter

BNC-BP BNC Male to Stackable Binding Posts

XG50 (Simple 49.380 MHz Signal Source)

KX3-PCKT Accessory Cable Set

Power Cables

2 KXUSB cables

8 Eneloop Pro 2450 mAh Ni-MH batteries (the kind that hold a charge)

Begali Adventure Key

Begali Adventure KX3 mount

Begali Adventure desk mount

A small microphone on a goose neck that allows hands free operation

Manuals

 

Approximate current purchase price for all items is:

 

Kit $2335.-

Assembled $2535.-

 

I'll sell all items for $1950.00, shipping included.  PayPal preferred.

USA Only

Please contact me off the list for any questions.

 

Thanks,

 

Roger, W1EM 

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[Elecraft] Building K2 SSB unit KSB2 version E

[will...@zendamateur.nl]

Hi every body,

 

Posted some messages, and love the way the list works.

Sorry about my English last message was just thinking on paper and that
ended in some comments :)

 

I bought the K2 ¼ already build, looked good so I took the risk…

 

Now wat I noticed having finished today the RF board, is that the previous
builder reversed the connectors J9 J10 and J11 he installed the mail side on
the RF board, and the female on the KSB2 board.

 

I don’t think there will be a divergence.

 

Any thoughts from the group ??

 

Regards William PE1BSB

 

 

 

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[Elecraft] KPA/100 displays wrong PS current (much lower)

[Ioannis Kassotakis]

Just finished building the KPA-100 for my S/N 2102 K2 (MCU v. 2.03D, KPA
1.06)
The K2/100 does not display the correct 13.8 V power supply current (by
taping Display) when it switches to HI POWER (>10 Watts).
I used a DMM in series to accurately measure the PS supplied current while
checking the K2 display at several power settings . Later, I also measured
the KPA TP1 voltage which is the I sense input to the KPA-100 processor.
For several power settings I got:
PWR (Watts) - PS Current (DMM) Amps - K2 Current Display Amps - KPA/100 TP1
(mV)
RX-0.4 - 0.44 - 0 
1.0- 1.72- 1.76 -0
5.0 - 3.3-3.3 - 0
10- 3.8 - 3.8 - 0
15- 4.5 - 1.01 - Not measured
20- 5.4 - 1.02 - 100
40 - 7.0 - 1.20 - 250
60 - 8.5 - 1.28 -380
80 - 9.5 - 1.41 - 500
100 - 10.3 - 1.48 - 580
111 - 10.8 - 1.54 - N/A
The measurements were done at 40 m (7.100) at CW to a dummy load through
KAT-100.

It seems to work fine a LO PWR (<11 Watts) but appears to have a scaling
issue, when the PA switches On to HI PWR mode.
According to the schem (p.61) I Sense is supposed to vary 0-5 V for 0-32 A,
so the TP1 figures seem to be rather low.
Is this a known issue? Is it possible that I have a failed U7 or Q5 ?

Thanks!

Ioannis


-- 
Ioannis Kassotakis
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[Elecraft] K3 frequency memory labels missing

[Jim McDonald]

Just did that, Dick, and no change.

73, Jim N7US



-Original Message-


You need to install all the files that came with that firmware version. The
FPF file and MCU file are coordinated.

Try installing all firmware instead of just the MCU.

73 de Dick, K6KR


-Original Message-

I don't know if it's related to updating my K3 with MCU 05.38, but I now
have a problem with the display.

After pressing M->V, the VFO B displays gibberish for all memories rather
than the label assigned in the Frequency Memory Editor program.

73, Jim N7US



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Re: [Elecraft] K3 frequency memory labels missing

[Dick Dievendorff]

You need to install all the files that came with that firmware version. The
FPF file and MCU file are coordinated.

Try installing all firmware instead of just the MCU.

73 de Dick, K6KR


-Original Message-
From: Elecraft [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Jim
McDonald
Sent: Sunday, April 24, 2016 06:44
To: Elecraft K3 Reflector ; Elecraft Reflector

Subject: [Elecraft] K3 frequency memory labels missing

I don't know if it's related to updating my K3 with MCU 05.38, but I now
have a problem with the display.

After pressing M->V, the VFO B displays gibberish for all memories rather
than the label assigned in the Frequency Memory Editor program.

73, Jim N7US




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delivered to d...@elecraft.com

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Re: [Elecraft] KPA500 Attenuation in Operate

[george allen]

Oooops, sorry Jack...was thinking of the KAT500 antenna tuner.  I have both the 
KAT500 tuner and the KPA500 amp.  I have not seen your issue with the 
ampbut, do see a similar issue with the tuner.

Sent from my iPad

> On Apr 24, 2016, at 10:17 AM, Jack  wrote:
> 
> I really don't understand your comments since there is no tuner in the KPA500
> Jack
> W4GRJ 
> 
> On Apr 24, 2016, at 10:14 AM, george allen  wrote:
> 
> If the KPA500 is not tuned to the frequency you listening to, the signal 
> strength will be way idown as the radio is not tuned to the antenna. Transmit 
> to tune the antenna, and the signal will come back up.  When in standby or 
> off, the tuner is out of the circuit so the antenna match MAY be some what 
> better.
> 
> I too, see this in my shack.  For example, tuner is on automatic, last 
> tranmit band was 20mtrs, and I listen to 40 mtrs...signal way down.  
> Transmit, the tuner tunes, and the signal strength is normal.
> 
> If you have your K3 connected to the tuner to supply frequency info to the 
> tuner, and you have "trained" the tuner to preset tuning for frequencies you 
> use, this should not happen.
> 
> In my case I am using a Flex6700 with the tuner...freq info not sent to the 
> tuner, so this is common for me.
> 
> Sent from my iPad
> 
>> On Apr 24, 2016, at 7:12 AM, Jack Satterfield  wrote:
>> 
>> This one has me scratching my head, when switching KPA500 from standby to
>> operate the receiver signal drops about 30db otherwise it is operating
>> Normally.
>> 
>> Suggestions appreciated
>> 
>> Jack
>> 
>> W4GRJ
>> 
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Re: [Elecraft] KPA500 Attenuation in Operate

[Jack]

I really don't understand your comments since there is no tuner in the KPA500
Jack
W4GRJ 

On Apr 24, 2016, at 10:14 AM, george allen  wrote:

If the KPA500 is not tuned to the frequency you listening to, the signal 
strength will be way down as the radio is not tuned to the antenna. Transmit to 
tune the antenna, and the signal will come back up.  When in standby or off, 
the tuner is out of the circuit so the antenna match MAY be some what better.

I too, see this in my shack.  For example, tuner is on automatic, last tranmit 
band was 20mtrs, and I listen to 40 mtrs...signal way down.  Transmit, the 
tuner tunes, and the signal strength is normal.

If you have your K3 connected to the tuner to supply frequency info to the 
tuner, and you have "trained" the tuner to preset tuning for frequencies you 
use, this should not happen.

In my case I am using a Flex6700 with the tuner...freq info not sent to the 
tuner, so this is common for me.

Sent from my iPad

> On Apr 24, 2016, at 7:12 AM, Jack Satterfield  wrote:
> 
> This one has me scratching my head, when switching KPA500 from standby to
> operate the receiver signal drops about 30db otherwise it is operating
> Normally.
> 
> Suggestions appreciated
> 
> Jack
> 
> W4GRJ
> 
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Re: [Elecraft] KPA500 Attenuation in Operate

[george allen]

If the KPA500 is not tuned to the frequency you listening to, the signal 
strength will be way down as the radio is not tuned to the antenna. Transmit to 
tune the antenna, and the signal will come back up.  When in standby or off, 
the tuner is out of the circuit so the antenna match MAY be some what better.
 
I too, see this in my shack.  For example, tuner is on automatic, last tranmit 
band was 20mtrs, and I listen to 40 mtrs...signal way down.  Transmit, the 
tuner tunes, and the signal strength is normal.

If you have your K3 connected to the tuner to supply frequency info to the 
tuner, and you have "trained" the tuner to preset tuning for frequencies you 
use, this should not happen.

In my case I am using a Flex6700 with the tuner...freq info not sent to the 
tuner, so this is common for me.

Sent from my iPad

> On Apr 24, 2016, at 7:12 AM, Jack Satterfield  wrote:
> 
> This one has me scratching my head, when switching KPA500 from standby to
> operate the receiver signal drops about 30db otherwise it is operating
> Normally.
> 
> Suggestions appreciated
> 
> Jack
> 
> W4GRJ
> 
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[Elecraft] FS: K3 and P3

[George Fenwick]

ELECRAFT K3/100, SN 7179, and P3 w/SVGA, SN 2970
Main Receiver has 2.8 and 1.8 filters
KRX3 Sub Receiver with 2.7 filter
KXV3A for IF Out and XVTR Interface
KIO3 I/O adapter
KDVR Digital Voice Recorder
NO ATU! (I used my KAT500 which is not for sale)
Nifty K3 manual, Nifty P3 Manual
Raytheon Commercial grade hand microphone (with Noise Canceling)
Power Cable with APP connectors, P3 cables come with P3.
Good Condition, Works fine. One non-smoking owner. No DXPeditions or Mobile. 
Take it out of the box and plug it into your PS and antenna and you are on the 
air.
W2AIV. Contact me at gafenwick at att.net. PayPal OK. K3, $2700 shipped CONUS 
(only). P3w/SVGA, $800 shipped CONUS (only), or $3300 for both.
P3 will not be sold until the K3 sells. Pictures on request.
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[Elecraft] For Sale; KX3

[Dan Baker]

Hello,
I have a KX3 for sale that is fully loaded. It has the KX Cooler heat sink,
2 Meter module, mic and extra power cord. It is factory built and has all
of the options installed. I am the original owner and it comes with the
original box and manual. There are no scuffs or scratches. It is my back up
rig and has had very little use. It just sits on my desk. Below are all the
options listed. I have $1970 into this. I will ship it to your door for
$1550 I prefer Paypal. Please contact me with any questions.

Thanks, Dan

*Pwr Cable, 3ft. APP to 2.1MM $14.95*
*KX3-2M-AT 2M All-Mode Internal KX3 Option $259.95*
*KX3-F KX3-F 160-6 M Transceiver (Assm) $1049.95*
*KX3-PCKT Accessory Cable Set $19.95*
*KXAT3 ATU for the KX3 $199.95*
*KXBC3 Int. NiMH Charger/Clk for KX3 $79.95*
*KXFL3 Dual-Passband Roofing Filter $149.95*
*MH3 Hand Mic. for KX3 $59.95*
*Cooler KX Plus(TM) Black Power Coat $118.00*

Thanks, Dan KM6CQ


www.km6cq.com
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[Elecraft] K3 frequency memory labels missing

[Jim McDonald]

I don't know if it's related to updating my K3 with MCU 05.38, but I now
have a problem with the display.

After pressing M->V, the VFO B displays gibberish for all memories rather
than the label assigned in the Frequency Memory Editor program.

73, Jim N7US




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Re: [Elecraft] PBSK31

[Matt Maguire]

Wouldn't want to go much higher than 5W though -- you want to maintain 
linearity, and PSK31 has a peak-to-average-power-ratio of 3dB.
73, Matt VK2RQ

Envoyé d’Outlook Mobile




On Sun, Apr 24, 2016 at 6:18 AM -0700, "lstavenhagen" 
 wrote:










I agree with Don, the K2 should be brick-on-key at 5 watts at least. On m 12V
batteries, mine are almost that way at full power, the heat sink at the
bottom definitely gets warm but seems to go forever without getting hot.

On a regulated PS, though, that doesn't drop into the 11v range like my
batts, that may not be true

73,
LS
W5QD



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[Elecraft] K2 freq stability

[lstavenhagen]

Hi all,
Here's an interesting finding, though I apologize if this is already in the
past archives.

No matter how careful you are when installing L33 on the bottom of the
board, it's so close to the bottom cover that any movement of it, say when
you're picking up the rig or manipulating the bale, etc., will pull the BFO.
On my 2nd K2 that I just completed it was so bad that I could pick up the
rig, set it back down and the tone of signals was very slightly, but
noticeably off. 

So what I did was put a lockwasher between the cover and the standoff near
L33 to raise the cover a little bit and get it the heck away from L33 as
much as I could. It actually made a large improvement in the general
frequency stability of the rig - which means before I was seeing more
contributions in overall drift from the BFO in addition to the rest of the
circuitry.

The washer is an ugly fix, since the cover bows out a little bit, but it's
totally non-destructive and reversible. I did the same fix to my other K2
which didn't have the problem to the same degree, but it helped on that one
too. 

Fortunately the slightly bowed out bottom cover is under the rig and you
never see it. But just in case you've been experiencing more drift in your
K2 than you think you should get, or it pulls when you pick it up that's
a fix that is working on mine.

73,
LS
W5QD



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Re: [Elecraft] PBSK31

[lstavenhagen]

I agree with Don, the K2 should be brick-on-key at 5 watts at least. On m 12V
batteries, mine are almost that way at full power, the heat sink at the
bottom definitely gets warm but seems to go forever without getting hot.

On a regulated PS, though, that doesn't drop into the 11v range like my
batts, that may not be true

73,
LS
W5QD



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Re: [Elecraft] PBSK31

[Don Wilhelm]

Bruce,

I always operated mine at 5 watts.  The K2/10 has a large heatsink area.
You may want to try even higher than 5 watts - if you want to check to make
sure it is OK, feel the bottom rear panel of the K2 enclosure.  It will 
be warm,
But you should still be able to hold your fingers on it.  If it is too 
hot to

touch continually, it is too hot.

73,
Don W3FPR

On 4/24/2016 12:37 AM, Bruce Rattray wrote:

What is the safe level to operate the K2 at for the PBSK31 mode?  I'm
thinking 2 or 3 watts.  tnx 73 Bruce ve5rc



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[Elecraft] KPA500 Attenuation in Operate

[Jack Satterfield]

This one has me scratching my head, when switching KPA500 from standby to
operate the receiver signal drops about 30db otherwise it is operating
Normally.

Suggestions appreciated

Jack

W4GRJ

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