Here’s a document which contains some useful information: http://www.pj2t.org/ccc/ssb.setup.for.K3.by.kb7q.pdf -- 73 de Mike Flowers, K6MKF, NCDXC - "It's about DX!"

What happens if you set QSK and NR off? Before a reset, restore a previously known good configuration. - 73 and good DX de Mike, K6MKF, NCDXC Vice-President 2021-2022 - In pursuit of DXCELLENCE!

With other gear, I've seen mechanical failures with the 3.5mm panel mount jack (socket). Might be worth opening the unit and checking the socket. - 73 and good DX de Mike, K6MKF, NCDXC Vice-President

Good deal! Glad to hear you got that sorted! -- 73 de Mike Flowers, K6MKF, NCDXC - "It's about DX!"

>>> K3 config I have the rs232 option set to USB – Isn’t this for CAT control? Check your WSJT-X > Settings > Audio to ensure you have the correct device selected – in your case the USB audio. - 73 an

If you have one, try reloading a previously save K3 configuration file through the K3 Utility. Your issue might have something to do with filter parameters stored there. Also: http://mailman.qth.net/p

Is Mic = LINE IN? -- 73 de Mike Flowers, K6MKF, NCDXC - "It's about DX!"

I had a similar situation. The solution I found was to increase my Astron PS to about 14.5 VDC output. Also found some issue with my DC power cable, which I corrected with beaver gauge cable. My K3 th

What does the DISP say about your input VDC? -- 73 de Mike Flowers, K6MKF, NCDXC - "It's about DX!"

It may just be that simple. If not, open up the P3 and reseat the ribbon cable connectors. -- 73 de Mike Flowers, K6MKF, NCDXC - "It's about DX!"

Try unplugging and reseating a coupe of times the RS-232 connectors on the P3 and the K3S. This has resolved similar issues for me. -- 73 de Mike Flowers, K6MKF, NCDXC - "It's about DX!"

You might want to open the K3 and reseat all the TMP connectors. I had other issues and this process corrected them. Takes a little time but for me it was worth the effort. - 73 and good DX de Mike, K

B Set > ANT ?? Has the ANT selection for the SUB changed? - 73 and good DX de Mike, K6MKF, NCDXC Vice-President 2021-2022

As this is band specific, I suspect RFI is the culprit. Does this happen at 1W RF output or into a dummy load? If not, it’s likely RFI. Jim K9YC has a great article on grounding and bonding here: http

Tap 'DISP' and use VFO B knob to cycle through various displays. - 73 and good DX de Mike, K6MKF, NCDXC Vice-President 2021-2022

Hi Ali, Change your display to show VDC input and observe when you transmit. My K3 powered down because my input VDC was too low. My solution was in two parts: 1. A broken spade connector at my power

Probably worth your time to open up the P3 and reseat ribbon connectors, etc. - 73 and good DX de Mike, K6MKF, NCDXC Vice-President 2021-2022

Hi Ralf, Your power supply voltage my be to low. I run my K3’s power supply at 14.5VDC input. My K3 reports 14.2VDC during TX. I had other issues and when I shortened my VDC input leads, eliminated so

I would suspect RFI. Try TX into a dummy load and monitor with a second receiver external to the K3. How close to the rig is the antenna? All components properly bonded to a common point? -- 73 de Mik

This article describes an antenna for use with the KX2/KX3, but of course would work with a K3: https://reflector.sota.org.uk/t/simple-resonant-multiband-antenna-for-use-with-kx3-2-and-internal-atu/16