[App_rpt-users] no receive audio in iaxRpt

Dale J. Robertson dale at nap.us.com
Wed Jul 22 16:25:33 EDT 2009

I am slowly but surely bringing up a remote Kenwood TS2000 using Limey 
linux with a URI
I have successfully gone through the steps in the wiki to get the rx 
audio adjusted.
iax-Rpt seems to be configured correctly and has no trouble connecting 
to my node.
transmit control seems to be working as expected i.e. it properly keys 
up the rig.
have not yet checked tx audio or deviation.
I am using the COR output from the kenwood. it is open collector and 
active low.
(measured 0.6 volts when receiver squelch is open 5.01 volts closed)
everything looks like it should be working, But, for the life of me I 
have not been able to get any receive audio on the iaxRpt windows client.
Win machine is XP sp3 on the same subnet as the limey box. there is an 
exception for iaxRpt in the windows firewall setup. tried with the 
firewall turned off there is still no audio.
my usbradio.conf looks like this:
; Open Sound System Console Driver Configuration File


hdwtype=0               ; Leave this set to 0 for USB sound fobs 
modified using
                        ; the instructions from usbfob.pdf. Use a setting of
                        ; 1 is for Dingotel/Sph interfaces.

rxboost=1         ; 0 = 20db attenuator inserted, 1= 20db attenuator removed
                        ; Set to 1 for additonal gain if using a 
low-level receiver output

rxctcssrelax=1          ; reduce talkoff from radios w/o CTCSS Tx HPF
                        ; Do not change this, leave this as a 1

txctcssdefault=100.0    ; default tx ctcss freq, any frequency permitted
rxctcssfreqs=100.0      ; rx ctcss freqs in floating point. must be in table
txctcssfreqs=100.0      ; tx ctcss freqs, any frequency permitted

carrierfrom=usbinvert   ; no,usb,usbinvert,dsp,vox
                        ; no - no carrier detection at all
                        ; usb - from the COR line on the modified USB 
sound fob
                        ; usbinvert - from the inverted COR line on the 
modified USB sound fob
                        ; dsp - from RX noise using dsp techniques
                        ; vox - voice activated from RX audio

ctcssfrom=no            ; no,usb,dsp
                        ; no - CTCSS decoding, system will be carrier 
                        ; usb - CTCSS decoding using input from USB FOB
                        ; (currently not supported)
                        ; dsp - CTCSS decoding using RX audio in DSP.
                        ; rxdemod option must be set to flat for this to 

rxdemod=flat            ; input type from radio: no,speaker,flat
                        ; no - RX audio input not used
                        ; flat - Use RX audio from discriminator
                        ; speaker - use de-emphasized audio

txprelim=yes            ; Audio processing on left output channel: no,yes
                        ; no - Audio is not pre-emphasized and limited.
                        ; Suitable for use on a microphone input
                        ; yes - Audio is pre-emphasized and limited.
                        ; Suitable for direct connection to an FM modulator

txtoctype=no            ; Transmit tone control type: no,phase,notone
                        ; no - CTCSS tone encoding with no hang time
                        ; phase - encode CTCSS and reverse phase
                        ; AKA ("reverse burst") before unkeying TX
                        ; notone - encode CTCSS and stop sending tone 
before unkeying TX
                        ; AKA ("chicken burst")

txmixa=voice            ; Left channel output: 
                        ; no - Do not output anything
                        ; voice - output voice only
                        ; tone - CTCSS tone only
                        ; composite - voice and tone
                        ; auxvoice - auxiliary voice output at headphone 
level for monitoring

txmixb=no               ; Right channel output: no,voice,tone,composite, 
                        ; See txmixa above.

invertptt=0             ; Invert PTT 0 = ground to transmit, 1 = open to 
                        ; This is the collector lead of the 2n4401 on 
the modified
                        ; usb sound fob.
                        ; please refer to the howto for the procedure to 
do this.

duplex=1                ; Full Duplex

can anyone tell me what I am doing wrong?

Dale NV8U

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