With OEM firmware you can try to fix it with replacing within /etc/init.d/S51amixer
amixer -c 0 sset 'Mic1 Boost',0 0 1> /dev/null
with
amixer -c 0 sset 'Mic1 Boost',0 1 1> /dev/null
?
This enables mic boost for audio comes from BASE to MAIN (messages recording, CW decoding)
?
Changing files on x6100 described here -
--
Georgy // R2RFE
