[Elecraft] Fwd: Re: K3 signal at 28004

[Dick Dievendorff]

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 <rthorne at rthorne.net> 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:elecraft-bounces at mailman.qth.net] On Behalf Of Mike
>> Harris
>> Sent: Sunday, December 11, 2016 1:24 PM
>> To: elecraft at mailman.qth.net
>> 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 <mike.harris at horizon.co.fk>
>> To: James Bennett <w6jhb at me.com>
>> 
>> 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 <pfizenmayer at q.com> 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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> 
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