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Fwd: Re: K3 signal at 28004

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Mike Harris-9

Fwd: Re: K3 signal at 28004

-------- Forwarded Message --------
Subject: Re: [Elecraft] K3 signal at 28004
Date: Sun, 11 Dec 2016 10:23:38 -0300
From: Mike Harris <[hidden email]>
To: James Bennett <[hidden email]>

I have that signal on my K3 without any other Elecraft peripherals
wrapped around it, internally it is pretty well stuffed with options.
However, I have installed the K3s KIO3B and KXV3B and observe the following:

With the antenna connected and using the 500Hz 5 pole CW filter if I
tune off 1kHz and set the dBV metering to 0dBV+/- on the noise floor
when re tuning to the signal I see 3dB+/- increase.

Enabling PRE 1 and re zeroing the dBV reading on tune increases to
+11dBV+/-.

Enabling Pre 2 and re zeroing the dBV reading on tune the signal has
vanished.

Pre 1 and Pre 2 are not co located and it is possible that layout is
determining what is being picked up internally.

Maybe a K3s owner would like to report the presence or not of this
signal. The K3s RF board has apparently been redesigned making it quieter.

Cycling the preamps on an weak external signal coming in off the
antenna, results in the expected changes in signal and noise, that is
when Pre 2 is enabled the external signal doesn't vanish.

This will need to be re visited using my XG3 on 1uV to eliminate QSB
effects.

Regards,

Mike VP8NO

On 11/12/2016 02:51, James Bennett wrote:
> Hank - I had that same signal at 28.004 and it was caused by my KAT500, as I recall. Elecraft has a fix for that - simple mod to the KAT500, if I recall correctly. Do you have a KAT500 and have you possibly removed power from it? If so, that's probably where your signal has gone. Just a guess....
>
> Jim Bennett / W6JHB
> Folsom, CA
>
>> On Dec 10, 2016, at 5:30 PM, HankP <[hidden email]> wrote:
>>
>> Ok I give up - I always have a strong signal about 28004 on my K3 and it was there this morning just like always and most all day - now its GONE and the rx seems like its still working normally -107 dBm on the P3 for the 1 uv in . TX ok too. Just no 28004 ??? What is the magic ?? Hank K7HP
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markmusick

Re: Fwd: Re: K3 signal at 28004

I have a K3S and the signal is at 28004.15. It is coming from the KAT500.
The signal is there even when the KAT500 is turned off from the front panel.
It vanishes when the KAT500 is disconnected from its power supply.
I seem to remember a discussion about this before, but I never checked my
KAT500 for the symptom.
Jim, what was the mod? I assume it is something Elecraft supplies and we can
install it ourselves?

Mark, WB9CIF

-----Original Message-----
From: Elecraft [mailto:[hidden email]] On Behalf Of Mike
Harris
Sent: Sunday, December 11, 2016 1:24 PM
To: [hidden email]
Subject: [Elecraft] Fwd: Re: K3 signal at 28004

-------- Forwarded Message --------
Subject: Re: [Elecraft] K3 signal at 28004
Date: Sun, 11 Dec 2016 10:23:38 -0300
From: Mike Harris <[hidden email]>
To: James Bennett <[hidden email]>

I have that signal on my K3 without any other Elecraft peripherals wrapped
around it, internally it is pretty well stuffed with options.
However, I have installed the K3s KIO3B and KXV3B and observe the following:

With the antenna connected and using the 500Hz 5 pole CW filter if I tune
off 1kHz and set the dBV metering to 0dBV+/- on the noise floor when re
tuning to the signal I see 3dB+/- increase.

Enabling PRE 1 and re zeroing the dBV reading on tune increases to
+11dBV+/-.

Enabling Pre 2 and re zeroing the dBV reading on tune the signal has
vanished.

Pre 1 and Pre 2 are not co located and it is possible that layout is
determining what is being picked up internally.

Maybe a K3s owner would like to report the presence or not of this signal.
The K3s RF board has apparently been redesigned making it quieter.

Cycling the preamps on an weak external signal coming in off the antenna,
results in the expected changes in signal and noise, that is when Pre 2 is
enabled the external signal doesn't vanish.

This will need to be re visited using my XG3 on 1uV to eliminate QSB
effects.

Regards,

Mike VP8NO

On 11/12/2016 02:51, James Bennett wrote:
> Hank - I had that same signal at 28.004 and it was caused by my KAT500, as
I recall. Elecraft has a fix for that - simple mod to the KAT500, if I
recall correctly. Do you have a KAT500 and have you possibly removed power
from it? If so, that's probably where your signal has gone. Just a guess....

>
> Jim Bennett / W6JHB
> Folsom, CA
>
>> On Dec 10, 2016, at 5:30 PM, HankP <[hidden email]> wrote:
>>
>> Ok I give up - I always have a strong signal about 28004 on my K3 and
>> it was there this morning just like always and most all day - now its
>> GONE and the rx seems like its still working normally -107 dBm on the
>> P3 for the 1 uv in . TX ok too. Just no 28004 ??? What is the magic
>> ?? Hank K7HP

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Richard Thorne-4

Re: Fwd: Re: K3 signal at 28004

I hear the signal on 28.005 on a Flex 6700 with the KPA-500/KAT-500
combo. If I disconnect the power from the KAT-500 the signal goes
away. So the issue does not appear to be rig specific.

I'd like to know what the mod is as well.

Rich - N5ZC

On 12/11/2016 10:54 AM, Mark E. Musick wrote:

> I have a K3S and the signal is at 28004.15. It is coming from the KAT500.
> The signal is there even when the KAT500 is turned off from the front panel.
> It vanishes when the KAT500 is disconnected from its power supply.
> I seem to remember a discussion about this before, but I never checked my
> KAT500 for the symptom.
> Jim, what was the mod? I assume it is something Elecraft supplies and we can
> install it ourselves?
>
> Mark, WB9CIF
>
> -----Original Message-----
> From: Elecraft [mailto:[hidden email]] On Behalf Of Mike
> Harris
> Sent: Sunday, December 11, 2016 1:24 PM
> To: [hidden email]
> Subject: [Elecraft] Fwd: Re: K3 signal at 28004
>
>
>
>
> -------- Forwarded Message --------
> Subject: Re: [Elecraft] K3 signal at 28004
> Date: Sun, 11 Dec 2016 10:23:38 -0300
> From: Mike Harris <[hidden email]>
> To: James Bennett <[hidden email]>
>
> I have that signal on my K3 without any other Elecraft peripherals wrapped
> around it, internally it is pretty well stuffed with options.
> However, I have installed the K3s KIO3B and KXV3B and observe the following:
>
> With the antenna connected and using the 500Hz 5 pole CW filter if I tune
> off 1kHz and set the dBV metering to 0dBV+/- on the noise floor when re
> tuning to the signal I see 3dB+/- increase.
>
> Enabling PRE 1 and re zeroing the dBV reading on tune increases to
> +11dBV+/-.
>
> Enabling Pre 2 and re zeroing the dBV reading on tune the signal has
> vanished.
>
> Pre 1 and Pre 2 are not co located and it is possible that layout is
> determining what is being picked up internally.
>
> Maybe a K3s owner would like to report the presence or not of this signal.
> The K3s RF board has apparently been redesigned making it quieter.
>
> Cycling the preamps on an weak external signal coming in off the antenna,
> results in the expected changes in signal and noise, that is when Pre 2 is
> enabled the external signal doesn't vanish.
>
> This will need to be re visited using my XG3 on 1uV to eliminate QSB
> effects.
>
> Regards,
>
> Mike VP8NO
>
> On 11/12/2016 02:51, James Bennett wrote:
>> Hank - I had that same signal at 28.004 and it was caused by my KAT500, as
> I recall. Elecraft has a fix for that - simple mod to the KAT500, if I
> recall correctly. Do you have a KAT500 and have you possibly removed power
> from it? If so, that's probably where your signal has gone. Just a guess....
>> Jim Bennett / W6JHB
>> Folsom, CA
>>
>>> On Dec 10, 2016, at 5:30 PM, HankP <[hidden email]> wrote:
>>>
>>> Ok I give up - I always have a strong signal about 28004 on my K3 and
>>> it was there this morning just like always and most all day - now its
>>> GONE and the rx seems like its still working normally -107 dBm on the
>>> P3 for the 1 uv in . TX ok too. Just no 28004 ??? What is the magic
>>> ?? Hank K7HP
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html Message
> delivered to [hidden email]
>
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
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>

Ken Wagner K3IU

Re: Fwd: Re: K3 signal at 28004

In reply to this post by markmusick

I sent an email query to Gary Surrency this morning, but of course have
not yet heard back from him yet.
73, Ken K3IU
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
On 12/11/2016 12:12 PM, Richard Thorne wrote:
> ...
>
> I'd like to know what the mod is as well.
>
> Rich - N5ZC
>

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Dick Dievendorff-4

Re: Fwd: Re: K3 signal at 28004

In reply to this post by Richard Thorne-4

There is a configuration setting you choose from the KAT500 Utility. Sleep when idle.

Choosing Sleep when Idle puts the microcontroller to sleep, turning off its Xtal oscillator, when you are receiving and there are no serial port commands. The uC wakes up during transmit to monitor SWR, and when tuning or processing serial port commands.

The setting is discussed in KAT500 Utility Help and the KAT500 programming reference.

73 de Dick, K6KR

> On Dec 11, 2016, at 09:12, Richard Thorne <[hidden email]> wrote:
>
> I hear the signal on 28.005 on a Flex 6700 with the KPA-500/KAT-500 combo. If I disconnect the power from the KAT-500 the signal goes away. So the issue does not appear to be rig specific.
>
> I'd like to know what the mod is as well.
>
> Rich - N5ZC
>
>> On 12/11/2016 10:54 AM, Mark E. Musick wrote:
>> I have a K3S and the signal is at 28004.15. It is coming from the KAT500.
>> The signal is there even when the KAT500 is turned off from the front panel.
>> It vanishes when the KAT500 is disconnected from its power supply.
>> I seem to remember a discussion about this before, but I never checked my
>> KAT500 for the symptom.
>> Jim, what was the mod? I assume it is something Elecraft supplies and we can
>> install it ourselves?
>>
>> Mark, WB9CIF
>>
>> -----Original Message-----
>> From: Elecraft [mailto:[hidden email]] On Behalf Of Mike
>> Harris
>> Sent: Sunday, December 11, 2016 1:24 PM
>> To: [hidden email]
>> Subject: [Elecraft] Fwd: Re: K3 signal at 28004
>>
>>
>>
>>
>> -------- Forwarded Message --------
>> Subject: Re: [Elecraft] K3 signal at 28004
>> Date: Sun, 11 Dec 2016 10:23:38 -0300
>> From: Mike Harris <[hidden email]>
>> To: James Bennett <[hidden email]>
>>
>> I have that signal on my K3 without any other Elecraft peripherals wrapped
>> around it, internally it is pretty well stuffed with options.
>> However, I have installed the K3s KIO3B and KXV3B and observe the following:
>>
>> With the antenna connected and using the 500Hz 5 pole CW filter if I tune
>> off 1kHz and set the dBV metering to 0dBV+/- on the noise floor when re
>> tuning to the signal I see 3dB+/- increase.
>>
>> Enabling PRE 1 and re zeroing the dBV reading on tune increases to
>> +11dBV+/-.
>>
>> Enabling Pre 2 and re zeroing the dBV reading on tune the signal has
>> vanished.
>>
>> Pre 1 and Pre 2 are not co located and it is possible that layout is
>> determining what is being picked up internally.
>>
>> Maybe a K3s owner would like to report the presence or not of this signal.
>> The K3s RF board has apparently been redesigned making it quieter.
>>
>> Cycling the preamps on an weak external signal coming in off the antenna,
>> results in the expected changes in signal and noise, that is when Pre 2 is
>> enabled the external signal doesn't vanish.
>>
>> This will need to be re visited using my XG3 on 1uV to eliminate QSB
>> effects.
>>
>> Regards,
>>
>> Mike VP8NO
>>
>>> On 11/12/2016 02:51, James Bennett wrote:
>>> Hank - I had that same signal at 28.004 and it was caused by my KAT500, as
>> I recall. Elecraft has a fix for that - simple mod to the KAT500, if I
>> recall correctly. Do you have a KAT500 and have you possibly removed power
>> from it? If so, that's probably where your signal has gone. Just a guess....
>>> Jim Bennett / W6JHB
>>> Folsom, CA
>>>
>>>> On Dec 10, 2016, at 5:30 PM, HankP <[hidden email]> wrote:
>>>>
>>>> Ok I give up - I always have a strong signal about 28004 on my K3 and
>>>> it was there this morning just like always and most all day - now its
>>>> GONE and the rx seems like its still working normally -107 dBm on the
>>>> P3 for the 1 uv in . TX ok too. Just no 28004 ??? What is the magic
>>>> ?? Hank K7HP
>> ______________________________________________________________
>> Elecraft mailing list
>> Home: http://mailman.qth.net/mailman/listinfo/elecraft
>> Help: http://mailman.qth.net/mmfaq.htm
>> Post: mailto:[hidden email]
>>
>> This list hosted by: http://www.qsl.net
>> Please help support this email list: http://www.qsl.net/donate.html Message
>> delivered to [hidden email]
>>
>> ______________________________________________________________
>> Elecraft mailing list
>> Home: http://mailman.qth.net/mailman/listinfo/elecraft
>> Help: http://mailman.qth.net/mmfaq.htm
>> Post: mailto:[hidden email]
>>
>> This list hosted by: http://www.qsl.net
>> Please help support this email list: http://www.qsl.net/donate.html
>> Message delivered to [hidden email]
>>
>
> ______________________________________________________________
> Elecraft mailing list
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> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
> Message delivered to [hidden email]

KQ5S

Re: Fwd: Re: K3 signal at 28004

In reply to this post by Ken Wagner K3IU

From page 20 in KAT500 manual:

1.

Idle Sleep

In some installations a 28004.5 MHz signal may be heard from an
oscillator in the KAT500. If this is an issue, you can cause the KAT500
oscillator to shut down when it is not needed. Click on Idle Sleep to
put a check in the radio button. The oscillator will stop running
shortly after the last key press or the last data communication with other
equipment and restart automatically when needed.
2.

3.

Tom, KQ5S

On Sun, Dec 11, 2016 at 11:40 AM, Ken K3IU <[hidden email]> wrote:

> I sent an email query to Gary Surrency this morning, but of course have
> not yet heard back from him yet.
> 73, Ken K3IU
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> On 12/11/2016 12:12 PM, Richard Thorne wrote:
>
>> ...
>>
>> I'd like to know what the mod is as well.
>>
>> Rich - N5ZC
>>
>>
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
> Message delivered to [hidden email]
>

Ken Wagner K3IU

Re: Fwd: Re: K3 signal at 28004

In reply to this post by Ken Wagner K3IU

Ah, yes... now I recall that. Thanks...
73, Ken K3IU
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
On 12/11/2016 12:44 PM, Tom wrote:

> From page 20 in KAT500 manual:
>
>
> 1.
>
> Idle Sleep
>
> In some installations a 28004.5 MHz signal may be heard from an
> oscillator in the KAT500. If this is an issue, you can cause the KAT500
> oscillator to shut down when it is not needed. Click on Idle Sleep to
> put a check in the radio button. The oscillator will stop running
> shortly after the last key press or the last data communication with other
> equipment and restart automatically when needed.
> 2.
>
>
> 3.
>
> Tom, KQ5S
>
>
> On Sun, Dec 11, 2016 at 11:40 AM, Ken K3IU <[hidden email]> wrote:
>
>> I sent an email query to Gary Surrency this morning, but of course have
>> not yet heard back from him yet.
>> 73, Ken K3IU
>> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>> On 12/11/2016 12:12 PM, Richard Thorne wrote:
>>
>>> ...
>>>
>>> I'd like to know what the mod is as well.
>>>
>>> Rich - N5ZC
>>>
>>>
>> ______________________________________________________________
>> Elecraft mailing list
>> Home: http://mailman.qth.net/mailman/listinfo/elecraft
>> Help: http://mailman.qth.net/mmfaq.htm
>> Post: mailto:[hidden email]
>>
>> This list hosted by: http://www.qsl.net
>> Please help support this email list: http://www.qsl.net/donate.html
>> Message delivered to [hidden email]
>>
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
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> Message delivered to [hidden email]
>

RobertG

Re: Fwd: Re: K3 signal at 28004

In reply to this post by markmusick

I have an original K3, #6232, with the new synthesizer. I hear the
signal at 28.004.55. It is S5 with the KAT500 turned on in either the
AUTO of MAN mode. In the BYP mode or with the KAT turned off, the signal
is still there but drops to an S3.

Interesting that while "everyone" hears it, not everyone hears it at the
same, exact frequency. Also, no one else has mentioned being able to
hear it, however faintly, with the tuner off or in the BYP mode.

...robert, KE2WY

On 12/11/2016 16:54, Mark E. Musick wrote:

> I have a K3S and the signal is at 28004.15. It is coming from the KAT500.
> The signal is there even when the KAT500 is turned off from the front panel.
> It vanishes when the KAT500 is disconnected from its power supply.
> I seem to remember a discussion about this before, but I never checked my
> KAT500 for the symptom.
> Jim, what was the mod? I assume it is something Elecraft supplies and we can
> install it ourselves?
>
> Mark, WB9CIF
>
> -----Original Message-----
> From: Elecraft [mailto:[hidden email]] On Behalf Of Mike
> Harris
> Sent: Sunday, December 11, 2016 1:24 PM
> To: [hidden email]
> Subject: [Elecraft] Fwd: Re: K3 signal at 28004
>
>
>
>
> -------- Forwarded Message --------
> Subject: Re: [Elecraft] K3 signal at 28004
> Date: Sun, 11 Dec 2016 10:23:38 -0300
> From: Mike Harris <[hidden email]>
> To: James Bennett <[hidden email]>
>
> I have that signal on my K3 without any other Elecraft peripherals wrapped
> around it, internally it is pretty well stuffed with options.
> However, I have installed the K3s KIO3B and KXV3B and observe the following:
>
> With the antenna connected and using the 500Hz 5 pole CW filter if I tune
> off 1kHz and set the dBV metering to 0dBV+/- on the noise floor when re
> tuning to the signal I see 3dB+/- increase.
>
> Enabling PRE 1 and re zeroing the dBV reading on tune increases to
> +11dBV+/-.
>
> Enabling Pre 2 and re zeroing the dBV reading on tune the signal has
> vanished.
>
> Pre 1 and Pre 2 are not co located and it is possible that layout is
> determining what is being picked up internally.
>
> Maybe a K3s owner would like to report the presence or not of this signal.
> The K3s RF board has apparently been redesigned making it quieter.
>
> Cycling the preamps on an weak external signal coming in off the antenna,
> results in the expected changes in signal and noise, that is when Pre 2 is
> enabled the external signal doesn't vanish.
>
> This will need to be re visited using my XG3 on 1uV to eliminate QSB
> effects.
>
> Regards,
>
> Mike VP8NO
>
> On 11/12/2016 02:51, James Bennett wrote:
>> Hank - I had that same signal at 28.004 and it was caused by my KAT500, as
> I recall. Elecraft has a fix for that - simple mod to the KAT500, if I
> recall correctly. Do you have a KAT500 and have you possibly removed power
> from it? If so, that's probably where your signal has gone. Just a guess....
>>
>> Jim Bennett / W6JHB
>> Folsom, CA
>>
>>> On Dec 10, 2016, at 5:30 PM, HankP <[hidden email]> wrote:
>>>
>>> Ok I give up - I always have a strong signal about 28004 on my K3 and
>>> it was there this morning just like always and most all day - now its
>>> GONE and the rx seems like its still working normally -107 dBm on the
>>> P3 for the 1 uv in . TX ok too. Just no 28004 ??? What is the magic
>>> ?? Hank K7HP
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html Message
> delivered to [hidden email]
>
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
> Message delivered to [hidden email]
>

--
Robert G Strickland, PhD ABPH - KE2WY
[hidden email]
Syracuse, New York, USA
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Kidder, George

Re: Fwd: Re: K3 signal at 28004

I also have a K3/100 (4094), original synthesizer, no KAT500 or KAT3.
This discussion triggered a look at 28 MHz region. Curiously, there is a
signal at 27.999.890, which seems to have a set of sidebands, 4 on each
side spaced 2.39 KHz, as seen on the NaP3 panscope.. This signal is
coming in on the antenna line, since it is strongest on my 80 M G5RV and
the 160 M vertical, audible but weaker on the 10 meter vertical (a
12AVQ) and all other antennas. A weak signal is audible on a dummy load
(an old Heath "Cantenna") at the end of 100' of coax and located 60 ft
away from the shack. No guarantees that the coaxes are not leaking, though.

At any rate, this is the report KE2WY was looking for.

For whatever that is worth - 73

George, W3HBM

On 12/11/2016 1:38 PM, Robert G Strickland wrote:

> I have an original K3, #6232, with the new synthesizer. I hear the
> signal at 28.004.55. It is S5 with the KAT500 turned on in either the
> AUTO of MAN mode. In the BYP mode or with the KAT turned off, the
> signal is still there but drops to an S3.
>
> Interesting that while "everyone" hears it, not everyone hears it at
> the same, exact frequency. Also, no one else has mentioned being able
> to hear it, however faintly, with the tuner off or in the BYP mode.
>
> ...robert, KE2WY
>
> On 12/11/2016 16:54, Mark E. Musick wrote:
>> I have a K3S and the signal is at 28004.15. It is coming from the
>> KAT500.
>> The signal is there even when the KAT500 is turned off from the front
>> panel.
>> It vanishes when the KAT500 is disconnected from its power supply.
>> I seem to remember a discussion about this before, but I never
>> checked my
>> KAT500 for the symptom.
>> Jim, what was the mod? I assume it is something Elecraft supplies and
>> we can
>> install it ourselves?
>>
>> Mark, WB9CIF
>>
>> -----Original Message-----
>> From: Elecraft [mailto:[hidden email]] On Behalf Of
>> Mike
>> Harris
>> Sent: Sunday, December 11, 2016 1:24 PM
>> To: [hidden email]
>> Subject: [Elecraft] Fwd: Re: K3 signal at 28004
>>
>>
>>
>>
>> -------- Forwarded Message --------
>> Subject: Re: [Elecraft] K3 signal at 28004
>> Date: Sun, 11 Dec 2016 10:23:38 -0300
>> From: Mike Harris <[hidden email]>
>> To: James Bennett <[hidden email]>
>>
>> I have that signal on my K3 without any other Elecraft peripherals
>> wrapped
>> around it, internally it is pretty well stuffed with options.
>> However, I have installed the K3s KIO3B and KXV3B and observe the
>> following:
>>
>> With the antenna connected and using the 500Hz 5 pole CW filter if I
>> tune
>> off 1kHz and set the dBV metering to 0dBV+/- on the noise floor when re
>> tuning to the signal I see 3dB+/- increase.
>>
>> Enabling PRE 1 and re zeroing the dBV reading on tune increases to
>> +11dBV+/-.
>>
>> Enabling Pre 2 and re zeroing the dBV reading on tune the signal has
>> vanished.
>>
>> Pre 1 and Pre 2 are not co located and it is possible that layout is
>> determining what is being picked up internally.
>>
>> Maybe a K3s owner would like to report the presence or not of this
>> signal.
>> The K3s RF board has apparently been redesigned making it quieter.
>>
>> Cycling the preamps on an weak external signal coming in off the
>> antenna,
>> results in the expected changes in signal and noise, that is when Pre
>> 2 is
>> enabled the external signal doesn't vanish.
>>
>> This will need to be re visited using my XG3 on 1uV to eliminate QSB
>> effects.
>>
>> Regards,
>>
>> Mike VP8NO
>>
>> On 11/12/2016 02:51, James Bennett wrote:
>>> Hank - I had that same signal at 28.004 and it was caused by my
>>> KAT500, as
>> I recall. Elecraft has a fix for that - simple mod to the KAT500, if I
>> recall correctly. Do you have a KAT500 and have you possibly removed
>> power
>> from it? If so, that's probably where your signal has gone. Just a
>> guess....
>>>
>>> Jim Bennett / W6JHB
>>> Folsom, CA
>>>
>>>> On Dec 10, 2016, at 5:30 PM, HankP <[hidden email]> wrote:
>>>>
>>>> Ok I give up - I always have a strong signal about 28004 on my K3 and
>>>> it was there this morning just like always and most all day - now its
>>>> GONE and the rx seems like its still working normally -107 dBm on the
>>>> P3 for the 1 uv in . TX ok too. Just no 28004 ??? What is the magic
>>>> ?? Hank K7HP
>> ______________________________________________________________
>> Elecraft mailing list
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>> Help: http://mailman.qth.net/mmfaq.htm
>> Post: mailto:[hidden email]
>>
>> This list hosted by: http://www.qsl.net
>> Please help support this email list: http://www.qsl.net/donate.html
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>> delivered to [hidden email]
>>
>> ______________________________________________________________
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>> Post: mailto:[hidden email]
>>
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>> Message delivered to [hidden email]
>>
>

James Bennett

Re: Fwd: Re: K3 signal at 28004

In reply to this post by markmusick

Yes, Elecraft will supply the mod, and if I recall, it is pretty easy to install. I think it was a matter on soldering on one or two small parts.

Jim Bennett / W6JHB
Folsom, CA

> On Dec 11, 2016, at 8:54 AM, Mark E. Musick <[hidden email]> wrote:
>
> I have a K3S and the signal is at 28004.15. It is coming from the KAT500.
> The signal is there even when the KAT500 is turned off from the front panel.
> It vanishes when the KAT500 is disconnected from its power supply.
> I seem to remember a discussion about this before, but I never checked my
> KAT500 for the symptom.
> Jim, what was the mod? I assume it is something Elecraft supplies and we can
> install it ourselves?
>
> Mark, WB9CIF
>
> -----Original Message-----
> From: Elecraft [mailto:[hidden email]] On Behalf Of Mike
> Harris
> Sent: Sunday, December 11, 2016 1:24 PM
> To: [hidden email]
> Subject: [Elecraft] Fwd: Re: K3 signal at 28004
>
>
>
>
> -------- Forwarded Message --------
> Subject: Re: [Elecraft] K3 signal at 28004
> Date: Sun, 11 Dec 2016 10:23:38 -0300
> From: Mike Harris <[hidden email]>
> To: James Bennett <[hidden email]>
>
> I have that signal on my K3 without any other Elecraft peripherals wrapped
> around it, internally it is pretty well stuffed with options.
> However, I have installed the K3s KIO3B and KXV3B and observe the following:
>
> With the antenna connected and using the 500Hz 5 pole CW filter if I tune
> off 1kHz and set the dBV metering to 0dBV+/- on the noise floor when re
> tuning to the signal I see 3dB+/- increase.
>
> Enabling PRE 1 and re zeroing the dBV reading on tune increases to
> +11dBV+/-.
>
> Enabling Pre 2 and re zeroing the dBV reading on tune the signal has
> vanished.
>
> Pre 1 and Pre 2 are not co located and it is possible that layout is
> determining what is being picked up internally.
>
> Maybe a K3s owner would like to report the presence or not of this signal.
> The K3s RF board has apparently been redesigned making it quieter.
>
> Cycling the preamps on an weak external signal coming in off the antenna,
> results in the expected changes in signal and noise, that is when Pre 2 is
> enabled the external signal doesn't vanish.
>
> This will need to be re visited using my XG3 on 1uV to eliminate QSB
> effects.
>
> Regards,
>
> Mike VP8NO
>
>> On 11/12/2016 02:51, James Bennett wrote:
>> Hank - I had that same signal at 28.004 and it was caused by my KAT500, as
> I recall. Elecraft has a fix for that - simple mod to the KAT500, if I
> recall correctly. Do you have a KAT500 and have you possibly removed power
> from it? If so, that's probably where your signal has gone. Just a guess....
>>
>> Jim Bennett / W6JHB
>> Folsom, CA
>>
>>> On Dec 10, 2016, at 5:30 PM, HankP <[hidden email]> wrote:
>>>
>>> Ok I give up - I always have a strong signal about 28004 on my K3 and
>>> it was there this morning just like always and most all day - now its
>>> GONE and the rx seems like its still working normally -107 dBm on the
>>> P3 for the 1 uv in . TX ok too. Just no 28004 ??? What is the magic
>>> ?? Hank K7HP
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html Message
> delivered to [hidden email]
>
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
> Message delivered to [hidden email]

Mike Harris-9

Re: Fwd: Re: K3 signal at 28004

In reply to this post by RobertG

Hi,

The S3 signal is probably from within the K3. As previously mentioned I
have this signal which in my case is 28004.676. Note: I do not have a
KAT500.

Out of curiosity I changed the K3 REF CAL parameter from the last
calibration setting of 49.379.892 to 49.379.700 a change of 192. The
frequency of the odd signal shifted and was displayed now on 28004.559 a
change of 117Hz. This might give an indication as to why different K3's
present this signal at slightly different frequencies.

I indicated in an earlier post that the signal vanished when PRE 2 was
activated, this was entirely due to it being buried by extra antenna
noise. When I repeated the test with my XG3 which clearly doesn't have a
load of antenna noise the signal still dropped by an indicated 8dBV or
so, if I remember correctly, when switching from PRE 1 to PRE 2. This
still makes me think it is due to a locational change within the box of
the respective pre-amps.

Does this matter, not a bit. At least it is Elecraft related.

Regards,

Mike VP8NO

On 11/12/2016 15:38, Robert G Strickland wrote:

ve3rrd

Re: Fwd: Re: K3 signal at 28004

I have a KX3 with the KXPA100 amp (with internal tuner), and I also hear
a strong S6 to S7 carrier on 28004.3 KHz. The signal disappears when I
set the KX3 "PA MODE" to OFF.

73, AL - VE3RRD

On 12/11/2016 6:23 PM, Mike Harris wrote:

> Hi,
>
> The S3 signal is probably from within the K3. As previously mentioned
> I have this signal which in my case is 28004.676. Note: I do not have
> a KAT500.
>
> Out of curiosity I changed the K3 REF CAL parameter from the last
> calibration setting of 49.379.892 to 49.379.700 a change of 192. The
> frequency of the odd signal shifted and was displayed now on 28004.559
> a change of 117Hz. This might give an indication as to why different
> K3's present this signal at slightly different frequencies.
>
> I indicated in an earlier post that the signal vanished when PRE 2 was
> activated, this was entirely due to it being buried by extra antenna
> noise. When I repeated the test with my XG3 which clearly doesn't have
> a load of antenna noise the signal still dropped by an indicated 8dBV
> or so, if I remember correctly, when switching from PRE 1 to PRE 2.
> This still makes me think it is due to a locational change within the
> box of the respective pre-amps.
>
> Does this matter, not a bit. At least it is Elecraft related.
>
> Regards,
>
> Mike VP8NO