I checked carefully and the "funny noise" is definitely from the
KXPA100. It's unlike the relays switching to find a match, but more
like a ringing, increasing in frequency. Just twice.
However I'm now convinced that my problem is RFI, thanks to all for the
great advice.
Oh, and all my equipment is carefully bonded, EXCEPT the darned PC. OK,
I'll do that next.
david KC1DNY
On 8/27/2020 1:39 PM, Mike Flowers wrote:
Sometimes, a line or cable is just the right fraction of a specific wavelength
to act as an efficient antenna, and RF will find it's way in.
With the digimodes your soundcard is involved, so if you're getting a 'funny
noise', that's where I'd look
- 73 and good DX de Mike, K6MKF, NCDXC Secretary
-----Original Message-----
From: elecraft-boun...@mailman.qth.net <elecraft-boun...@mailman.qth.net>
On Behalf Of David Haines
Sent: Thursday, August 27, 2020 10:32
To: donw...@embarqmail.com; elecraft@mailman.qth.net
Subject: Re: [Elecraft] KX3 radio settings for WSJT-X
Don:
Problem goes away when I reduce to 20W, the maximum for my dummy load.
I just put ferrites on mouse wires, keyboard wires, and sound wires and nothing
changed. I guess I could add more, but ... .
Maybe my best solution is to go to wireless mouse and keyboard. I intentionally
used wired because my cybersecurity son is against wireless... .
Still doesn't explain the funny noise from the KXP100, does it?
david KC1DNY
On 8/27/2020 1:20 PM, Don Wilhelm wrote:
David,
As someone else suggested, it sounds a lot like RF feedback on 17m.
Try operating into a dummy load to see if the same thing happens - if
not, get out the ferrites.
73,
Don W3FPR
On 8/27/2020 12:41 PM, David Haines wrote:
Here are more details:
All seems to be working fine on 160m-10m except for 17m, so KX3 VFO
is at 18.100 for the rest of this discussion.
Without WSJT-X running, ATU finds a 1.1 match and TUNE button on KX3
works as expected.
With WSJT-X running, using the WSJT-X TUNE button causes the following:
1. KXPA100 power LED's light from left to right _twice_, in
synchronization with a musical ringing that rises in frequency, then
settle down quietly to about 100W.
2. Around the same time Windows reports "USB device not recognized"
and the mouse cursor disappears. At this point different things can
happen: Maybe the cursor comes back and I can stop the TUNE at
WSJT-X. Maybe it doesn't and I have to shut off the KX3 with XMIT
button. Sometimes the PC freezes and needs a hard reset.
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