[RFI] Mysterious K3 Symptoms - RFI? : Important addendum

[Hisashi T Fujinaka]

Literally every time.

As Fred said, it's probably a Remoterig bug.

On Fri, 15 Mar 2024, Pete Smith N4ZR wrote:

> Hi OM - you say "every time".  Do you mean that literally?  Does it happen 
> without your having transmitted before it happens?  It sure is a mystery, as 
> is the fact that mine cleared up completely with no clear connection to 
> anything I did.  I'm inclined to think that I may have a bad cable or 
> connector leaking RF into the rig
>
> 73, Pete N4ZR
>
> On 3/14/2024 5:01 PM, Hisashi T Fujinaka wrote:
>>  I have similar problems but I was thinking it was hamlib because of the
>>  way it triggers for me.
>>
>>  It happens running wsjtx on an M2 Macbook Pro and remoterig down to the
>>  radio in my basement. There's a K3/0 in my office -> remoterig -> K3 &
>>  KPA1500 in the basement. Almost every time I move my transmit frequency
>>  the RX gain goes down to almost nothing. Jiggling the AF gain brings it
>>  back to normal. It doesn't always happen immediately when changing bands
>>  but changing TX frequency in-band triggers it right away.
>>
>>  On Wed, 13 Mar 2024, Pete Smith N4ZR wrote:
>>
>>>  Operating in this morning's CWT, and saw a recurrence of strange RFI-like
>>>  symptoms.  After transmitting, RX gain sometimes was severely reduced,
>>>  but simply moving the K-3's AF gain a little would cause recovery to
>>>  normal. Sometimes, this was accompanied by a HI CURR warning on the K3's
>>>  display, often occurring several seconds after switching back to receive.
>>>
>>>  My working theory has been RFI, but my station is pretty thoroughly
>>>  fitted with toroids. Still, there seems to be a correlation between
>>>  running my KPA-1500 at about 1100 watts and this set of symptoms, which I
>>>  have not been able to trigger running 100 watts   To further confuse
>>>  things, I just had another episode of this occurring *several minutes*
>>>  after the last transmission.
>>>
>>>  One culprit I can think of is a 100-foot Ethernet cable between my
>>>  station and my FIOS router.  I have bought a shielded replacement but
>>>  have not yet installed it.  After reading some of the recent commentary
>>>  about so-called "shielded" cables, I'm wondering if this is worth doing.
>>>
>>>  Any suggestions, either K-3-specific or more general, would be much
>>>  appreciated.
>>>
>>>  **ADDENDUM** - I just tested into my dummy load with the amp operational
>>>  at 1100 watts, and triggered all the same symptoms.
>>> 
>>> 
>> 
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-- 
Hisashi T Fujinaka - htodd at twofifty.com
BSEE + BSChem + BAEnglish + MSCS + $2.50 = coffee