[Elecraft] Fwd: Re: K3 signal at 28004

[Mark E. Musick]

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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