On 24/06/2013 18:40, Jon Rorke wrote:

Since this is a half duplex radio, make sure you have duplex=1 in rpt.conf and in usbradio.conf you have duplex = 0.

If usbradio has duplex = 1 then it thinks you have a full duplex radio.
You need to tell usbradio it is half duplex.

Hi John,

usbradio.conf is duplex=0 - Always has been!

I've done a few more tests to rule out hardware (such as removing the USB wlan dongle, rebooting & running on a cable) but still no luck.

usbradio.conf contents are pasted below, for anyone that is interested:

;
; Usbradio channel driver Configuration File
;

[general]

[usb29681]

hdwtype=0
rxboost=1
txboost=1
rxctcssrelax=1
;#txctcssdefault=100.0
;#rxctcssfreqs=100.0
;#txctcssfreqs=100.0
;rxctcssoverride=0
carrierfrom=vox
ctcssfrom=no
rxdemod=speaker
txprelim=no
txlimonly=no
txtoctype=notone
txmixa=voice
txmixb=no
invertptt=0
duplex=0
rxondelay=0
rxnoisefiltype=0
eeprom=0

#includeifexists custom/usbradio.conf