[Elecraft] Fwd: Re: K3 signal at 28004

[Richard Thorne]

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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