Dec 2022 / Jan 2023 —
I have been trying to setup up the K3 and Mumble to enable proper audio for remote operation. The issue encountered was at the remote location, microphone input was being played back into my ears with the round trip induced latency, essentially “jamming” my ability to speak coherently.
Thanks to an email with the exact solution from Kazu M0CFW, M5Z, JK3GAD, I have figured it out! K3 LIN OUT has a TX MON setting that was added later than my printed user manuals (K3 # 251, so it has been around a while).
K3 MCU 5.58 / DSP 2.88 / FPF 1.26, 3-16-2017
* PREAMP 2 (ON KXV3B) NOW USABLE ON 15 AND 17 M: PREAMP 2 improves noise figure by about 6 dB on 15 m and 3 dB on 17 m relative to PREAMP 1.
* TX LINE OUT (MONITOR) LEVEL NOW ADJUSTABLE: In CONFIG:LIN OUT menu entry, tap ‘2’ (REV switch) to set the “T=” level (TX monitor). Tap ‘2’ again to return to the RX LINE OUT settingK3 documentation and software update
All three of my K3 had TX MON = 30. Adjust to 0, Mumble problem 100% resolved!
I remember now that this was set to provide ability to record N1MM voice keyer messages on the fly! Because I didn’t remember, I’ve made notes in the config matrix of all my K3 manuals.