[Elecraft] Fwd: Re: K3 signal at 28004

Sun Dec 11 14:29:30 EST 2016

  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: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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