[Elecraft] RFI on K3s

[G4GNX]

FWIW I still have a few issues with RFi, but I've managed to cure two of the 
major ones, the rest are a matter of finding time.

At present, I'm running an MFJ 1500W auto-tuner which needs a 12V supply for 
the display, logic and relays. I had a massive drifting "birdie" on 40 
metres, but it didn't always appear on the same frequency. I found that it 
shifted frequency with minor changes in load, caused by using different 
relays within the tuner. I replaced the switch mode PSU and all is now good.

The second major issue was mainly on 2 metres, but there were also sprogs on 
other bands. This turned out to be a PC PSU which despite an application of 
ferrite rings, would not lie down! I found that if the PC was put into 
'sleep' mode, it would go quiet. I finally replaced the PSU - problem 
solved.

Just a few thoughts on what you might look for.

73,

Alan. G4GNX

-----Original Message----- 
From: Clay Autery
Sent: Monday, June 20, 2016 5:41 PM
To: elecraft at mailman.qth.net
Subject: Re: [Elecraft] RFI on K3s

Marc and Drew,

Appreciate the feedback... Checking my PS is my first test.  Will power
off all circuits except the one to my shack that runs the AC to the PS.
Then I'll A/B with radio on battery and on the PS.  (PS
air-gapped/unplugged when on batt).
If it is the PS, I'll try to choke the I/O power leads first before
doing anything else.

I've a strong feeling it is NOT the SS-30DV...  My antenna is an 80m
loop outside at 38-40 feet.  Fed with 300 ladder to the 6:1 balun.  Only
15-20 feet of coax total (LMR240-DB with N-Connectors) direct from balun
to radio.

Before I do anything beyond IDing culprits, I have to address other
shortcomings first:  1) Insufficient service ground, 2) no shack ground,
3) no bond from non-existent shack ground to service ground.  :(
Knew I should have done those things BEFORE I went OTA...  the mic/K3 is
a huge distraction from my TO DO list.  ;)

73,

______________________
Clay Autery, KY5G
MONTAC Enterprises
(318) 518-1389