[Elecraft] KX3 SPL N/A Message

[Jwahar Bammi via Elecraft]

KX3 + KXPA 100 + PX3 (upgraded to latest firmware)

 

Mode: DATA A

Band: Any

 

In WSJT-X I enabled Rig Split operation. Running FT8 mode.

 

At the beginning of every transmit I briefly see "SPL N/A"

Not sure why or what it means. 

 

I made QSOs, previously I used Split Operation "Non" and "Fake It" settings
and they work just fine.

 

Any explanation of "SPL N/A" appreciated - RTFM does not yield any answers
unless I missed something.

 

73 de k1jbd

Bammi

 

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Re: [Elecraft] KRC2 Manual Errata??

[Wayne Burdick]

Hi Rich,

I copied this to the designer of the KRC2 to get his input/suggestions.

73,
Wayne
N6KR


> On May 20, 2020, at 3:34 PM, Rich  wrote:
> 
> I had been in conversation with Elecraft Tech Support, but I have not heard 
> back from them in three weeks.   So I will throw this out to the group.
> 
> It appears that there is an error in the KRC2 manual and it is not shown in 
> the Errata sheet.
> 
> On page 24 the manual states the following when connecting the KRC2 to an 
> Icom radio:
> 
> "For this reason it is recommended that the reference input setup be used. In 
> this configuration, the band data is connected to pin 9 and the 8 volt 
> reference is connected to pin 4. This mode is set with jumpers W1, W2 and W3 
> installed."
> 
> Directly below that statement this statement appears which confirms the first 
> statement:
> 
> "• Analog band input on J1/2 pin 9 with reference voltage on J1/2 pin 4:"
> 
> If you look at the schematic it shows Pin 9 as Reference voltage (8v) and Pin 
> 4 ALC (band voltage)
> 
> So they are reversed.
> 
> Since the wording and the schematic disagree.
> 
> Does anybody have any idea which is correct?
> 
> My unit is not working properly.  I sent it in for repair but 1 hour of labor 
> is about the cost of the unit.  So they returned it and I am trying to 
> troubleshoot it myself
> 
> Rich
> 
> K3RWN
> 
> 
> 
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Re: [Elecraft] Looking to add LP700 to KPA1500 - ideas?

[John Simmons]

There was a recent discussion about this on a forum I belong to, 
especially comparing the LP100 to a Bird. The original article 
describing the design of the LP100 (not 'A') by Larry said he calibrated 
the meter with a Bird 4410. I asked Larry about his calibration 
procedure on the LP100 (or LP500- can't remember) email reflector. He no 
longer uses a Bird for calibration! So many hams (and CB'ers) think a 
Bird is the ultimate in accuracy not so! However the Telepost meters 
are not field instruments! Check recent posts in the reflector I 
mentioned to see Larry's calibration procedure.


BTW, Ameritron/MFJ use an LP100 to calibrate their meters!
--
-de John NIØK

Don Wilhelm wrote on 5/20/2020 5:20 PM:
The Telepost LP100 (and I expect the LP700) are calibrated to NIST 
traceable standards.  I bought an LP100 kit (no longer in kit form) 
and did my own calibration after construction - then sent it to Larry 
for his real calibration.
Although Larry will not commit to it, I suspect the accuracy to be in 
the vicinity of 2% or better.


There are a number of LP100s in the Elecraft working area.  I don't 
know how often they are sent back to Larry for a calibration check.  
What I do know is that they are better than the average Bird used by 
hams.


73,
Don W3FPR

On 5/20/2020 5:52 PM, Mark Goldberg wrote:
 Hams tend to treat uncalibrated test

gear as gospel. An external power meter, just because it reports to the
nearest 0.1W isn't necessarily better. Any commercial operation 
calibrates
on a regular cycle. Being a slightly less cheap Ham than most, I do 
get one

scope / spectrum analyzer calibrated every year, so at least I have
something to compare the other stuff to.


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Re: [Elecraft] K1-4 low power and poor receive on 40 meters

[rocketnj]

Hi Don,

You nailed it. No output from the 15 MHz crystal. The other three bands are 
showing good output. I checked the relays K1 and K2 to verify each has pins 3 
to 4 conductivity when on 40 meters (set radio to 40 meters, power down, and 
remove filter board since relays are latching. One side of crystal checks good 
to ground and the other side checks good to P1 pin 4.

Ordered new 15 MHz crystal from Elecraft.

Thanks for the advice. Once I got the RF volt meter it took a few minutes to 
find the problem.

73 and thanks again!
Dave wo2x


-Original Message-
From: Don Wilhelm  
Sent: Wednesday, May 20, 2020 2:37 PM
To: rocke...@gmail.com; elecraft@mailman.qth.net
Subject: Re: [Elecraft] K1-4 low power and poor receive on 40 meters

There is the possibility that the 40 meter crystal has low activity.
Check the RF voltage at pin 4 of P1 on the band board.  You should read 70mV or 
more with an RF Probe or 200mV+ peak to peak if using a 'scope with a 10X probe.

A good working K1 will develop at least 5 watts.
Make up an RF probe if you don't have one.  It does not have to be fancy, just 
stick the component leads through a piece of cardboard and solder the leads 
together.  You need a 1N34 diode (not a silicon diode) Elecraft does have a kit.

73,
Don W3FPR

On 5/20/2020 1:35 PM, rocke...@gmail.com wrote:
> Hi Don
>
> I have done that using the Marconi for RX, then touching up for TX. I 
> understand 40 is a combo of 30 & 40 settings. After carefully retuning (done 
> it several times) the best I can get on 40 is about 60 to 75 mW. 30 makes 
> better than 2 watts. The menu for power out is set to 2.0 on 40. Receive 
> sensitivity is 10 to 15 dB down from 30 meter receive.
>
> I read that the windings on T3 and T4 are critical. I have counted the 
> turns and verified which side #1,2,3 and 4 are coming off the core. 
> Both T3 and T4 appear to be fine. There is enough wire left over in 
> the box the radio was in so I can rewind T3 or T4. From what I see on 
> the schematic T4 would most likely be the suspect (if it is the 
> transformer.)
>
> I am going to borrow an RF Power meter with probe and check 30 vs 40 meter 
> readings on the Premix in & out and the RF filter in & out. That will greatly 
> help pinpoint the issue.
>
> 73
> Dave wo2x
>
>
> -Original Message-
> From: Don Wilhelm 
> Sent: Wednesday, May 20, 2020 11:39 AM
> To: rocke...@gmail.com; elecraft@mailman.qth.net
> Subject: Re: [Elecraft] K1-4 low power and poor receive on 40 meters
>
> Dave,
>
> Refer to the K1FL4 instructions and re-tune the trimmers on the filter board. 
>  They MUST be done in the proper band sequence - 30 meters before 40m, 15m 
> before 20m.  The PreMixer portion is usually the most critical for power 
> output.
>
> 73,
> Don W3FPR
>
> On 5/20/2020 11:20 AM, rocke...@gmail.com wrote:
>> Hi All,
>>
>>
>>
>> I am going to sell a K1-4 (4 band 40, 30, 20, 15) for the estate of 
>> my Elmer. In testing the radio I found 40 meters is about 15dB less 
>> sensitivity than 30 and power out about 75 mW. I have double checked 
>> the values of components on the filter board to ensure they are 
>> correct and installed correctly. I also checked T3 and T4 which can 
>> cause issues on 40. T3 has 23 turns on the secondary with three turns 
>> on the primary. T4 has 24 turns on secondary and two turns on primary.
>> Another symptom is the CH trimmer cap seems to be at one end of tuning range 
>> (not seeing double peak).
>>
>>
>>
>> Note - the radio does not have the ATU option and 30 meters is set 
>> for
>> 10.1 MHz and not 10.0 (double checked crystals).
>>
>>
>>
>> >From what I can measure so far the relays seem to be working "as designed".
>> When I switch from 15 meters to 40 meters I can see the pulses to the 
>> relays to switch them (latching relays. I did notice in the 4 band 
>> filter manual it says K6 relay is not active on 40 but I do see it 
>> active and looking at the schematic K6 switches between 15/20 
>> operation and 30/40 so I think there is a typo in the filter board manual at 
>> the bottom of page 23.
>>
>>
>>
>> I am using a Marconi service monitor for testing. I have not built an 
>> RF probe yet and hoping someone has seen this symptom before. I would 
>> like to get the K1 fully operational as the proceeds are going to my 
>> Elmer's widow 100%
>>


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[Elecraft] KRC2 Manual Errata??

[Rich]

I had been in conversation with Elecraft Tech Support, but I have not 
heard back from them in three weeks.   So I will throw this out to the 
group.


It appears that there is an error in the KRC2 manual and it is not shown 
in the Errata sheet.


On page 24 the manual states the following when connecting the KRC2 to 
an Icom radio:


"For this reason it is recommended that the reference input setup be 
used. In this configuration, the band data is connected to pin 9 and the 
8 volt reference is connected to pin 4. This mode is set with jumpers 
W1, W2 and W3 installed."


Directly below that statement this statement appears which confirms the 
first statement:


"• Analog band input on J1/2 pin 9 with reference voltage on J1/2 pin 4:"

If you look at the schematic it shows Pin 9 as Reference voltage (8v) 
and Pin 4 ALC (band voltage)


So they are reversed.

Since the wording and the schematic disagree.

Does anybody have any idea which is correct?

My unit is not working properly.  I sent it in for repair but 1 hour of 
labor is about the cost of the unit.  So they returned it and I am 
trying to troubleshoot it myself


Rich

K3RWN



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Re: [Elecraft] Looking to add LP700 to KPA1500 - ideas?

[Don Wilhelm]

The Telepost LP100 (and I expect the LP700) are calibrated to NIST 
traceable standards.  I bought an LP100 kit (no longer in kit form) and 
did my own calibration after construction - then sent it to Larry for 
his real calibration.
Although Larry will not commit to it, I suspect the accuracy to be in 
the vicinity of 2% or better.


There are a number of LP100s in the Elecraft working area.  I don't know 
how often they are sent back to Larry for a calibration check.  What I 
do know is that they are better than the average Bird used by hams.


73,
Don W3FPR

On 5/20/2020 5:52 PM, Mark Goldberg wrote:
 Hams tend to treat uncalibrated test

gear as gospel. An external power meter, just because it reports to the
nearest 0.1W isn't necessarily better. Any commercial operation calibrates
on a regular cycle. Being a slightly less cheap Ham than most, I do get one
scope / spectrum analyzer calibrated every year, so at least I have
something to compare the other stuff to.


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Re: [Elecraft] Looking to add LP700 to KPA1500 - ideas?

[Mark Goldberg]

I tend to agree. With the right calculations, the reported power, SWR and
matching inductors and capacitors from the KPA1500 will tell you more about
the antenna. In addition, the KPA1500 already has a monitoring port that
could be used for an output modulation / spectrum monitor. Of course,
something like that would have to be built that took those inputs. I expect
a K4 will do it!

The KPA500 does get calibrated at the factory for power, SWR, etc, probably
against decent, calibrated test equipment. I'll bet it is designed to hold
some sort of calibration over time. Hams tend to treat uncalibrated test
gear as gospel. An external power meter, just because it reports to the
nearest 0.1W isn't necessarily better. Any commercial operation calibrates
on a regular cycle. Being a slightly less cheap Ham than most, I do get one
scope / spectrum analyzer calibrated every year, so at least I have
something to compare the other stuff to.

Does the KPA500 report the tuner topology (if it is even switchable)? Is it
an L match? Does it report which element is the shunt element?

Does a specific L and C and shunt element match only one unique load? The
other issue is that the Ls and Cs reported are probably 20% or more off, so
the calculation would not be perfect. The C and L ladders are not even
guaranteed monotonic, so a reported LC combination may be off. Tuners often
try the next one higher and lower. I did measurements of an LDG tuner and
the inductance jumped up and down. Step N-1 was not necessarily less
inductance than step N. Two steps generally got in the right direction.

73,

Mark
W7MLG


On Wed, May 20, 2020 at 12:07 PM Rick NK7I  wrote:

> The KAT500 (and utility) can show the values used by the tuner to match
> the 50 ohm impedance of the radio.  Similar is possible either via the
> KPA1500 utility or the front panel of the KPA1500.
>
> While it doesn't show the complex load; it gives enough to begin to
> figure out what the antenna is presenting (for use in apps like WinSmith
> etc) so one can make intelligent changes in the antenna.
>
> I've used the utility for monitoring (and remote control) of the
> KPA500/KAT500 combo for years; now I'm using the KPA1500 utility for the
> same reason.
>
> The KPA1500 presents a lot more useful information on the front panel
> (click on the menu button then the down triangle to select the menu you
> want).  Because my antennas are resonant, I park the amp display at
> power out, efficiency, volts and amps used and temp.  The power out on
> the utility also shows the reflected power in watts, nice to know.
>
> If you put the LP sensor between the amp and the (not resonant) antenna,
> any mismatch will likely give you erroneous readings that would offer no
> value.  It would compare the antenna value (say 150 ohms of mixed
> reactance/resistance) to the tuner value (whatever is required to match
> to 50 ohms).  The worse the unmatched condition, the more useless the
> display becomes.  It wants to see 50 ohm in, 50 ohm out to provide
> accurate power readings.
>
> So if your antennas demand a matching circuit (tuner), the LP sensor
> becomes less valued at the output of the amp.
>
> 73,
> Rick NK7I
>
> On 5/20/2020 9:41 AM, Andy Durbin wrote:
> > "If it were mine, I would put the LP700 on the antenna line to monitor
> what is going on with the antenna itself."
> >
> > My LP-100A is between my KPA500 and my KAT500.  I want to know what load
> is being presented to the KPA500.   Neither the KPA500 not the KAT500 can
> display complex load values.  Since the LP-500 and LP-700 are intended to
> sample amplifier RF input and amplifier RF output I would expect the
> amplifier output sampling to be performed before the tuner.  But no, I
> don't know how to do that with a KPA1500.  It would seem to require an
> internal modification and two additional rear panel connectors.
> >
> > 73,
> > Andy, k3wyc
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Re: [Elecraft] Looking to add LP700 to KPA1500 - ideas?

[Jim Brown]

On 5/20/2020 9:41 AM, Andy Durbin wrote:

It would seem to require an internal modification and two additional rear panel 
connectors.


I would STRONGLY urge NO mods to the KPA1500. When showing the amp in 
the booth at Visalia, K6XX described how tricky it was to stabilize it 
on 6M, and the very small changes that made the difference.


73, Jim K9YC
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Re: [Elecraft] Looking to add LP700 to KPA1500 - ideas?

[Rick NK7I]

The KAT500 (and utility) can show the values used by the tuner to match 
the 50 ohm impedance of the radio.  Similar is possible either via the 
KPA1500 utility or the front panel of the KPA1500.


While it doesn't show the complex load; it gives enough to begin to 
figure out what the antenna is presenting (for use in apps like WinSmith 
etc) so one can make intelligent changes in the antenna.


I've used the utility for monitoring (and remote control) of the 
KPA500/KAT500 combo for years; now I'm using the KPA1500 utility for the 
same reason.


The KPA1500 presents a lot more useful information on the front panel 
(click on the menu button then the down triangle to select the menu you 
want).  Because my antennas are resonant, I park the amp display at 
power out, efficiency, volts and amps used and temp.  The power out on 
the utility also shows the reflected power in watts, nice to know.


If you put the LP sensor between the amp and the (not resonant) antenna, 
any mismatch will likely give you erroneous readings that would offer no 
value.  It would compare the antenna value (say 150 ohms of mixed 
reactance/resistance) to the tuner value (whatever is required to match 
to 50 ohms).  The worse the unmatched condition, the more useless the 
display becomes.  It wants to see 50 ohm in, 50 ohm out to provide 
accurate power readings.


So if your antennas demand a matching circuit (tuner), the LP sensor 
becomes less valued at the output of the amp.


73,
Rick NK7I

On 5/20/2020 9:41 AM, Andy Durbin wrote:

"If it were mine, I would put the LP700 on the antenna line to monitor what is going 
on with the antenna itself."

My LP-100A is between my KPA500 and my KAT500.  I want to know what load is 
being presented to the KPA500.   Neither the KPA500 not the KAT500 can display 
complex load values.  Since the LP-500 and LP-700 are intended to sample 
amplifier RF input and amplifier RF output I would expect the amplifier output 
sampling to be performed before the tuner.  But no, I don't know how to do that 
with a KPA1500.  It would seem to require an internal modification and two 
additional rear panel connectors.

73,
Andy, k3wyc
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Re: [Elecraft] K1-4 low power and poor receive on 40 meters

[Dave]

Thanks Don

I am borrowing a military surplus RF voltmeter with probe this afternoon. I was 
thinking the crystal also.  Not many parts in the circuit.

Thanks for the pointers.

73
Dave wo2x

Sent from my iPad

> On May 20, 2020, at 2:36 PM, Don Wilhelm  wrote:
> 
> There is the possibility that the 40 meter crystal has low activity.
> Check the RF voltage at pin 4 of P1 on the band board.  You should read 70mV 
> or more with an RF Probe or 200mV+ peak to peak if using a 'scope with a 10X 
> probe.
> 
> A good working K1 will develop at least 5 watts.
> Make up an RF probe if you don't have one.  It does not have to be fancy, 
> just stick the component leads through a piece of cardboard and solder the 
> leads together.  You need a 1N34 diode (not a silicon diode) Elecraft does 
> have a kit.
> 
> 73,
> Don W3FPR
> 
>> On 5/20/2020 1:35 PM, rocke...@gmail.com wrote:
>> Hi Don
>> 
>> I have done that using the Marconi for RX, then touching up for TX. I 
>> understand 40 is a combo of 30 & 40 settings. After carefully retuning (done 
>> it several times) the best I can get on 40 is about 60 to 75 mW. 30 makes 
>> better than 2 watts. The menu for power out is set to 2.0 on 40. Receive 
>> sensitivity is 10 to 15 dB down from 30 meter receive.
>> 
>> I read that the windings on T3 and T4 are critical. I have counted the turns 
>> and verified which side #1,2,3 and 4 are coming off the core. Both T3 and T4 
>> appear to be fine. There is enough wire left over in the box the radio was 
>> in so I can rewind T3 or T4. From what I see on the schematic T4 would most 
>> likely be the suspect (if it is the transformer.)
>> 
>> I am going to borrow an RF Power meter with probe and check 30 vs 40 meter 
>> readings on the Premix in & out and the RF filter in & out. That will 
>> greatly help pinpoint the issue.
>> 
>> 73
>> Dave wo2x
>> 
>> 
>> -Original Message-
>> From: Don Wilhelm 
>> Sent: Wednesday, May 20, 2020 11:39 AM
>> To: rocke...@gmail.com; elecraft@mailman.qth.net
>> Subject: Re: [Elecraft] K1-4 low power and poor receive on 40 meters
>> 
>> Dave,
>> 
>> Refer to the K1FL4 instructions and re-tune the trimmers on the filter 
>> board.  They MUST be done in the proper band sequence - 30 meters before 
>> 40m, 15m before 20m.  The PreMixer portion is usually the most critical for 
>> power output.
>> 
>> 73,
>> Don W3FPR
>> 
>>> On 5/20/2020 11:20 AM, rocke...@gmail.com wrote:
>>> Hi All,
>>> 
>>>   
>>> I am going to sell a K1-4 (4 band 40, 30, 20, 15) for the estate of my
>>> Elmer. In testing the radio I found 40 meters is about 15dB less
>>> sensitivity than 30 and power out about 75 mW. I have double checked
>>> the values of components on the filter board to ensure they are
>>> correct and installed correctly. I also checked T3 and T4 which can
>>> cause issues on 40. T3 has 23 turns on the secondary with three turns
>>> on the primary. T4 has 24 turns on secondary and two turns on primary.
>>> Another symptom is the CH trimmer cap seems to be at one end of tuning 
>>> range (not seeing double peak).
>>> 
>>>   
>>> Note - the radio does not have the ATU option and 30 meters is set for
>>> 10.1 MHz and not 10.0 (double checked crystals).
>>> 
>>>   
>>> >From what I can measure so far the relays seem to be working "as designed".
>>> When I switch from 15 meters to 40 meters I can see the pulses to the
>>> relays to switch them (latching relays. I did notice in the 4 band
>>> filter manual it says K6 relay is not active on 40 but I do see it
>>> active and looking at the schematic K6 switches between 15/20
>>> operation and 30/40 so I think there is a typo in the filter board manual 
>>> at the bottom of page 23.
>>> 
>>>   
>>> I am using a Marconi service monitor for testing. I have not built an
>>> RF probe yet and hoping someone has seen this symptom before. I would
>>> like to get the K1 fully operational as the proceeds are going to my
>>> Elmer's widow 100%
>>> 
> 
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Re: [Elecraft] K1-4 low power and poor receive on 40 meters

[Don Wilhelm]

There is the possibility that the 40 meter crystal has low activity.
Check the RF voltage at pin 4 of P1 on the band board.  You should read 
70mV or more with an RF Probe or 200mV+ peak to peak if using a 'scope 
with a 10X probe.


A good working K1 will develop at least 5 watts.
Make up an RF probe if you don't have one.  It does not have to be 
fancy, just stick the component leads through a piece of cardboard and 
solder the leads together.  You need a 1N34 diode (not a silicon diode) 
Elecraft does have a kit.


73,
Don W3FPR

On 5/20/2020 1:35 PM, rocke...@gmail.com wrote:

Hi Don

I have done that using the Marconi for RX, then touching up for TX. I understand 40 
is a combo of 30 & 40 settings. After carefully retuning (done it several 
times) the best I can get on 40 is about 60 to 75 mW. 30 makes better than 2 watts. 
The menu for power out is set to 2.0 on 40. Receive sensitivity is 10 to 15 dB down 
from 30 meter receive.

I read that the windings on T3 and T4 are critical. I have counted the turns 
and verified which side #1,2,3 and 4 are coming off the core. Both T3 and T4 
appear to be fine. There is enough wire left over in the box the radio was in 
so I can rewind T3 or T4. From what I see on the schematic T4 would most likely 
be the suspect (if it is the transformer.)

I am going to borrow an RF Power meter with probe and check 30 vs 40 meter readings on 
the Premix in & out and the RF filter in & out. That will greatly help pinpoint 
the issue.

73
Dave wo2x


-Original Message-
From: Don Wilhelm 
Sent: Wednesday, May 20, 2020 11:39 AM
To: rocke...@gmail.com; elecraft@mailman.qth.net
Subject: Re: [Elecraft] K1-4 low power and poor receive on 40 meters

Dave,

Refer to the K1FL4 instructions and re-tune the trimmers on the filter board.  
They MUST be done in the proper band sequence - 30 meters before 40m, 15m 
before 20m.  The PreMixer portion is usually the most critical for power output.

73,
Don W3FPR

On 5/20/2020 11:20 AM, rocke...@gmail.com wrote:

Hi All,

   


I am going to sell a K1-4 (4 band 40, 30, 20, 15) for the estate of my
Elmer. In testing the radio I found 40 meters is about 15dB less
sensitivity than 30 and power out about 75 mW. I have double checked
the values of components on the filter board to ensure they are
correct and installed correctly. I also checked T3 and T4 which can
cause issues on 40. T3 has 23 turns on the secondary with three turns
on the primary. T4 has 24 turns on secondary and two turns on primary.
Another symptom is the CH trimmer cap seems to be at one end of tuning range 
(not seeing double peak).

   


Note - the radio does not have the ATU option and 30 meters is set for
10.1 MHz and not 10.0 (double checked crystals).

   


>From what I can measure so far the relays seem to be working "as designed".
When I switch from 15 meters to 40 meters I can see the pulses to the
relays to switch them (latching relays. I did notice in the 4 band
filter manual it says K6 relay is not active on 40 but I do see it
active and looking at the schematic K6 switches between 15/20
operation and 30/40 so I think there is a typo in the filter board manual at 
the bottom of page 23.

   


I am using a Marconi service monitor for testing. I have not built an
RF probe yet and hoping someone has seen this symptom before. I would
like to get the K1 fully operational as the proceeds are going to my
Elmer's widow 100%



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[Elecraft] WTB: KAT500

[Peter Iverson]

Looking for a KAT500 from a non-smoking shack. Please contact me via email 
directly with condition, price, and serial number. Photos much appreciated. 
Pete, KH6GK
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[Elecraft] 5-17-2020 SSB Net

[Eric Lanzl]

Here is the log of the stations checking in to the Sunday Net. Again, thank you 
to the relay stations who always help get those who have trouble hearing net 
control get to participate in the net. Also, welcome to the first time check 
ins. Everyone is welcome to participate in the net. Sundays 1800Z 14.303.5. And 
our new net on 40m 7.280 at 18:45Z. Net control is Steve WM6P in Georgia.    
Eric WB9JNZ

Call Name  State   Radio   Serial #  QRP
   Notes

WB9JNZ  Eric    IL    K3   
4017      NetControl

N6JW  John      CA       K3/ KX3       936  
    RelayStation

NC0JW    Jim    CO   KX3    
1356      
RelayStation

N6PGQ    Bob   CA   K3  
5891       

WB8DKK Ken    MA  Icom   9600   
        

KC1ACL      Steve NM  KX3  10677
        

K7BRR     Bill AZ  K3S  
10939        

K8NU/7        Carl   OH/WA        Yaesu FT       2000   
        

KO5V   Jim NM K2/100       7225 
       RelayStation

KA6MOK      John  CA  K2  1251  
         

W7QHD    Kurt   AZ      K2/100       1538   
        

K6VWE Stan  MI   K3        
650         

KB9AVO       Paul   IN       K3S   
11103        

AE1E    Ken   NM      K3S   
11611        

K1TSX  Wayne  CO  KX3         3714  
         

NS7P    Phil   OR      K3   
1826       

N0MPM         Mike      IA       K3S   
10514        

W1NGA         Al  CO         K3   
5765       

WM6P       Steve    GA     K3S   11453  
      

KS7D    Mike   FL K3    
 118         

KC9JXJ  Hy  IL  Kenwood 590 SG  
        

W7CSW    Spence  AZ K2   5400   
        

K5APL   Wes  AR K2   
3505       

WW4JF      John TN      K3 / K3S   6185 / 
11177       
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Re: [Elecraft] Elecraft Digest, Vol 193, Issue 35

[rocketnj]

That is fine for resonant antennas but I would like to monitor between the
amp and tuner.

I know the amp has a sample out port for adaptive predistortion. I had
changed the two small (very small) resistors on the filter board to adjust
the sample out level to work with an Anan radio with no attenuation. I
believe the new amps are shipping with this mod already done.

Too bad the sample out couldn't be used on the LP700...

Dave wo2x


-Original Message-
From: elecraft-boun...@mailman.qth.net  On
Behalf Of Warren Merkel
Sent: Wednesday, May 20, 2020 12:47 PM
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] Elecraft Digest, Vol 193, Issue 35

I definitely wouldn't bother to modify the KPA1500 to have a monitor loop!

I bought two sensors -- one between the K3 and the KPA1500, and the other
between the amplifer output and the antenna feedline.  The
LP500/LP700 supports up to four sensors.

This allows easy swapping from exciter output to amplifier output with a
button press, and allows amplifier linearity monitoring using the LP700.

Warren, KD4Z

On 5/20/2020 11:38 AM, elecraft-requ...@mailman.qth.net wrote:

> 
> I am thinking about adding a Telepost LP700 to my station but I would 
> need to insert it between the amp and tuner (which are integrated 
> together in the KPA1500).
> 
> Any ideas if it is worth doing something to loop the RF out of the amp 
> to the coupler and back in again? Probably no easy way to do it.
> 
>   
> 
> Just a thought.
> 
>   
> 
> Dave wo2x

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[Elecraft] Subject: Re: [K2] Serial number

[Jan]

Hi Doug, WØUHU and Don, W3FPR

I assembled K2 serial number 136 ~ and an /Elecraft K2 # 136 shirt/ too 
~ both now 20 years old


K2 has been upgraded a little, but not much has changed in there

Cheers, Jan K1ND

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Re: [Elecraft] K1-4 low power and poor receive on 40 meters

[rocketnj]

Hi Don

I have done that using the Marconi for RX, then touching up for TX. I 
understand 40 is a combo of 30 & 40 settings. After carefully retuning (done it 
several times) the best I can get on 40 is about 60 to 75 mW. 30 makes better 
than 2 watts. The menu for power out is set to 2.0 on 40. Receive sensitivity 
is 10 to 15 dB down from 30 meter receive.

I read that the windings on T3 and T4 are critical. I have counted the turns 
and verified which side #1,2,3 and 4 are coming off the core. Both T3 and T4 
appear to be fine. There is enough wire left over in the box the radio was in 
so I can rewind T3 or T4. From what I see on the schematic T4 would most likely 
be the suspect (if it is the transformer.)

I am going to borrow an RF Power meter with probe and check 30 vs 40 meter 
readings on the Premix in & out and the RF filter in & out. That will greatly 
help pinpoint the issue.

73
Dave wo2x


-Original Message-
From: Don Wilhelm  
Sent: Wednesday, May 20, 2020 11:39 AM
To: rocke...@gmail.com; elecraft@mailman.qth.net
Subject: Re: [Elecraft] K1-4 low power and poor receive on 40 meters

Dave,

Refer to the K1FL4 instructions and re-tune the trimmers on the filter board.  
They MUST be done in the proper band sequence - 30 meters before 40m, 15m 
before 20m.  The PreMixer portion is usually the most critical for power output.

73,
Don W3FPR

On 5/20/2020 11:20 AM, rocke...@gmail.com wrote:
> Hi All,
> 
>   
> 
> I am going to sell a K1-4 (4 band 40, 30, 20, 15) for the estate of my 
> Elmer. In testing the radio I found 40 meters is about 15dB less 
> sensitivity than 30 and power out about 75 mW. I have double checked 
> the values of components on the filter board to ensure they are 
> correct and installed correctly. I also checked T3 and T4 which can 
> cause issues on 40. T3 has 23 turns on the secondary with three turns 
> on the primary. T4 has 24 turns on secondary and two turns on primary. 
> Another symptom is the CH trimmer cap seems to be at one end of tuning range 
> (not seeing double peak).
> 
>   
> 
> Note - the radio does not have the ATU option and 30 meters is set for 
> 10.1 MHz and not 10.0 (double checked crystals).
> 
>   
> 
>>From what I can measure so far the relays seem to be working "as designed".
> When I switch from 15 meters to 40 meters I can see the pulses to the 
> relays to switch them (latching relays. I did notice in the 4 band 
> filter manual it says K6 relay is not active on 40 but I do see it 
> active and looking at the schematic K6 switches between 15/20 
> operation and 30/40 so I think there is a typo in the filter board manual at 
> the bottom of page 23.
> 
>   
> 
> I am using a Marconi service monitor for testing. I have not built an 
> RF probe yet and hoping someone has seen this symptom before. I would 
> like to get the K1 fully operational as the proceeds are going to my 
> Elmer's widow 100%
> 

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Re: [Elecraft] Looking to add LP700 to KPA1500 - ideas?

[rocketnj]

Thanks Andy.

That is something to think about. Wouldn't be that hard. Have to check my 
purchase date to make sure it is out of warranty. 😊

Dave wo2x

-Original Message-
From: elecraft-boun...@mailman.qth.net  On 
Behalf Of Andy Durbin
Sent: Wednesday, May 20, 2020 12:55 PM
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] Looking to add LP700 to KPA1500 - ideas?

"It would seem to require an internal modification and two additional rear 
panel connectors."

FCC photos shows LPF RF Out is a BNC and tuner RF In is a BNC.Should be an 
easy mod if there is room on the rear panel for 2 BNC connectors.  Perhaps the 
LP-700 coupler would fit inside the LP1500 case?

Easy to speculate about mods to someone else's equipment.

73,
Andy, k3wyc

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Re: [Elecraft] Looking to add LP700 to KPA1500 - ideas?

[Andy Durbin]

"It would seem to require an internal modification and two additional rear 
panel connectors."

FCC photos shows LPF RF Out is a BNC and tuner RF In is a BNC.Should be an 
easy mod if there is room on the rear panel for 2 BNC connectors.  Perhaps the 
LP-700 coupler would fit inside the LP1500 case?

Easy to speculate about mods to someone else's equipment.

73,
Andy, k3wyc

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[Elecraft] Have a KX-3 loaded as new

[George P Linehan III via Elecraft]

Prefer a trade for a Yaesu 991a +$.

Will post pics..

Paul WA6YCA SAN DIEGO
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Re: [Elecraft] Elecraft Digest, Vol 193, Issue 35

[Warren Merkel]

I definitely wouldn't bother to modify the KPA1500 to have a monitor loop!

I bought two sensors -- one between the K3 and the KPA1500, and the 
other between the amplifer output and the antenna feedline.  The 
LP500/LP700 supports up to four sensors.


This allows easy swapping from exciter output to amplifier output with a 
button press, and allows amplifier linearity monitoring using the LP700.


Warren, KD4Z

On 5/20/2020 11:38 AM, elecraft-requ...@mailman.qth.net wrote:



I am thinking about adding a Telepost LP700 to my station but I would need
to insert it between the amp and tuner (which are integrated together in the
KPA1500).

Any ideas if it is worth doing something to loop the RF out of the amp to
the coupler and back in again? Probably no easy way to do it.

  


Just a thought.

  


Dave wo2x


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[Elecraft] Looking to add LP700 to KPA1500 - ideas?

[Andy Durbin]

"If it were mine, I would put the LP700 on the antenna line to monitor what is 
going on with the antenna itself."

My LP-100A is between my KPA500 and my KAT500.  I want to know what load is 
being presented to the KPA500.   Neither the KPA500 not the KAT500 can display 
complex load values.  Since the LP-500 and LP-700 are intended to sample 
amplifier RF input and amplifier RF output I would expect the amplifier output 
sampling to be performed before the tuner.  But no, I don't know how to do that 
with a KPA1500.  It would seem to require an internal modification and two 
additional rear panel connectors.

73,
Andy, k3wyc
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Re: [Elecraft] Looking for a KX-3

[WM3M]

Bill,

I have a KX3 I have been considering selling, bought it to use in RV, 
camping but sold RV and not using it.


Let me know if you are interested.

Thank you  73

Emory  WM3M
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[Elecraft] QRPworks SideKar Extreme is now available

[Shel KF0UR]

QRPworks is happy to announce the availability of the new SideKar Extreme.
It's the ultimate QRP accessory for field operations offering:

- Built-in logger for up to 1000 QSOs.  ADIF log file output to PC via USB
with free utility.

- K1EL WinKeyer supports Iambic A/B, Ultimatic, and Bug Modes.  Compatible
with any rig with a straight key input (ex. KX1, K2, etc.)

- 20 CW Message Memories, editable using a wireless or wired USB keyboard

- CW keying using any USB keyboard

- 80 Character (20 X 4)  sunlight readable display

- Small  ( 4.2 x 1.4 x 2.9", 107 x 34 x 74 mm)  and light  7.8 oz, 221 grams
(our smallest and lightest 80 character product)

- Low power consumption

- Battery-backed real time clock for log date and time auto entry

- For the Elecraft K-Line, decoded CW, PSK, and RTTY display on 80 character
LCD. Auto-populates log with frequency and mode.  Includes quick keyboard
QSY feature including frequency and mode.  Rig macros can be stored and sent
to the KX2/3, K3/K3S to automate complex configurations.

- For FT-817/818 rigs, auto populates log with frequency and mode. Includes
keyboard quick QSY feature including frequency and mode. FT817/818 DIN ACC
cable included.

- Coming soon for the QRP Labs QCX, decoded CW displays on 80 character LCD.
Auto-populates log with frequency and mode.  Includes quick keyboard QSY
feature including frequency and mode.  

Instant access to log mode via push button on SideKar

- Log has features specific for SOTA, Field Day, and other special event
operations

- Details and manual available at www.QRPworks.com

 

In lieu of Hamvention this year, we're offering a $15 discount until the end
of May.   Details on our website at www.QRPworks.com.   

 

73,

 

Shel KF0UR & Steve KB3SII

www.QRPworks.com

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Re: [Elecraft] Looking to add LP700 to KPA1500 - ideas?

[Don Wilhelm]

Dave,

The KPA1500 has indicators for both power output and SWR between the amp 
ant tuner sections.
If it were mine, I would put the LP700 on the antenna line to monitor 
what is going on with the antenna itself.


73,
Don W3FPR

On 5/20/2020 11:24 AM, rocke...@gmail.com wrote:

Hi All,

  


I am thinking about adding a Telepost LP700 to my station but I would need
to insert it between the amp and tuner (which are integrated together in the
KPA1500).

Any ideas if it is worth doing something to loop the RF out of the amp to
the coupler and back in again? Probably no easy way to do it.


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Re: [Elecraft] K1-4 low power and poor receive on 40 meters

[Don Wilhelm]

Dave,

Refer to the K1FL4 instructions and re-tune the trimmers on the filter 
board.  They MUST be done in the proper band sequence - 30 meters before 
40m, 15m before 20m.  The PreMixer portion is usually the most critical 
for power output.


73,
Don W3FPR

On 5/20/2020 11:20 AM, rocke...@gmail.com wrote:

Hi All,

  


I am going to sell a K1-4 (4 band 40, 30, 20, 15) for the estate of my
Elmer. In testing the radio I found 40 meters is about 15dB less sensitivity
than 30 and power out about 75 mW. I have double checked the values of
components on the filter board to ensure they are correct and installed
correctly. I also checked T3 and T4 which can cause issues on 40. T3 has 23
turns on the secondary with three turns on the primary. T4 has 24 turns on
secondary and two turns on primary. Another symptom is the CH trimmer cap
seems to be at one end of tuning range (not seeing double peak).

  


Note - the radio does not have the ATU option and 30 meters is set for 10.1
MHz and not 10.0 (double checked crystals).

  


From what I can measure so far the relays seem to be working "as designed".

When I switch from 15 meters to 40 meters I can see the pulses to the relays
to switch them (latching relays. I did notice in the 4 band filter manual it
says K6 relay is not active on 40 but I do see it active and looking at the
schematic K6 switches between 15/20 operation and 30/40 so I think there is
a typo in the filter board manual at the bottom of page 23.

  


I am using a Marconi service monitor for testing. I have not built an RF
probe yet and hoping someone has seen this symptom before. I would like to
get the K1 fully operational as the proceeds are going to my Elmer's widow
100%


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[Elecraft] Looking to add LP700 to KPA1500 - ideas?

[rocketnj]

Hi All,

 

I am thinking about adding a Telepost LP700 to my station but I would need
to insert it between the amp and tuner (which are integrated together in the
KPA1500).

Any ideas if it is worth doing something to loop the RF out of the amp to
the coupler and back in again? Probably no easy way to do it.

 

Just a thought.

 

Dave wo2x

 

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[Elecraft] K1-4 low power and poor receive on 40 meters

[rocketnj]

Hi All,

 

I am going to sell a K1-4 (4 band 40, 30, 20, 15) for the estate of my
Elmer. In testing the radio I found 40 meters is about 15dB less sensitivity
than 30 and power out about 75 mW. I have double checked the values of
components on the filter board to ensure they are correct and installed
correctly. I also checked T3 and T4 which can cause issues on 40. T3 has 23
turns on the secondary with three turns on the primary. T4 has 24 turns on
secondary and two turns on primary. Another symptom is the CH trimmer cap
seems to be at one end of tuning range (not seeing double peak).

 

Note - the radio does not have the ATU option and 30 meters is set for 10.1
MHz and not 10.0 (double checked crystals).

 

>From what I can measure so far the relays seem to be working "as designed".
When I switch from 15 meters to 40 meters I can see the pulses to the relays
to switch them (latching relays. I did notice in the 4 band filter manual it
says K6 relay is not active on 40 but I do see it active and looking at the
schematic K6 switches between 15/20 operation and 30/40 so I think there is
a typo in the filter board manual at the bottom of page 23.

 

I am using a Marconi service monitor for testing. I have not built an RF
probe yet and hoping someone has seen this symptom before. I would like to
get the K1 fully operational as the proceeds are going to my Elmer's widow
100%

 

Thanks for reading!

 

Dave wo2x

 

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[Elecraft] K3/P3 Items For Sale

[ockmrzr]

I upgraded of my two K3's & P3's recently and have some left over items

 

1x - KIO3A (3 board set) I/O interface

1x - KXV3A Transverter Interface

4x - KSYN3 synthesizer module

2x - E980297, RJ-45 TO DE-9S (KIO3B RS232) Cable

1x - KXUSB Cable (with KAT500 power cord)

1x - E850824, KPA1500 PS Min Load Kit

 

If interested, let me know via direct email, n...@arrl.net
 

 

"Let's Make a Deal"

 

73 de Bruce, N7TY

Yuma, AZ

www.qsl.net/n7ty  

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[Elecraft] W2 Directional Coupler

[Phil Theis]

I have a spare 1.8-54 MHz 200W Max Directional Coupler that I'd like to 
sell for $100 + USPS.


Please email off list.

Phil K3TUF

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