[Elecraft] RFI on K3s

[Ramon Tristani]

How can you detect the drifting if RF if Iyou have to turn off the K-3 and the P3?

Sent from my iPhone

> On Jun 20, 2016, at 1:06 PM, G4GNX <G4GNX at theatreorgans.co.uk> wrote:
> 
> 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
> 
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