[App_rpt] Problem tuning USB Radio Interface - resistor wring?

Anonymous wqex694 at wqex694.info
Thu Feb 14 07:29:20 EST 2008

I don't know if this may be the problem, since I do have audio into and 
back out of the usb device, but I'm a bit confused about the wiring at 
http://usbradio.org/usbfob.pdf for the resistors.

The written instructions say that the end of the resistors that are 
twisted together get connected to the white wire and that the loose end 
of 68k goes to ground and the loose end of 470k to pin 3 (I'm guessing 
to RX Audio from radio)

The picture shows the white wire (black in the picture) is connected to 
the loose end of the 470k while the loose end of 68k is connected to 
ground and the twisted end to pin 3.

I don't know if this has been talked about before, I gave up searching 
through the archived manually.  It would be a lot easier if this were on 
a forum so that you could just search the forum for keywords.  Any help 
on which one of these would be right would be greatly appreciated.


Jeff Lavoie wrote:
> I seem to have a problem tuning the USB radio interface.  Here'e what I 
> get in the CLI.
> *CLI> radio tune
> Active radio interface is [usb]
> Output A is currently set to composite.
> Output B is currently set to voice.
> Tx Voice Level currently set to 500
> Tx Tone Level currently set to 200
> Rx Squelch currently set to 500
> Device String is 3-2
> Usage: radio tune <function>
>        rxnoise
>        rxvoice
>        rxtone
>        rxsquelch [newsetting]
>        txvoice [newsetting]
>        txtone [newsetting]
>        auxvoice [newsetting]
>        save (settings to tuning file)
>        load (tuning settings from EEPROM)
>        All [newsetting]'s are values 0-999
> *CLI> radio tune rxnoise
> tune rxnoise maxtries=12, target=23000, tolerance=2000
> tries=0, setting=2, meas=1
> tries=1, setting=16, meas=1
> tries=2, setting=16, meas=1
> tries=3, setting=16, meas=1
> tries=4, setting=16, meas=1
> tries=5, setting=16, meas=1
> tries=6, setting=16, meas=1
> tries=7, setting=16, meas=1
> tries=8, setting=16, meas=1
> tries=9, setting=16, meas=1
> tries=10, setting=16, meas=1
> tries=11, setting=16, meas=1
> DONE tries=12, setting=1000, meas=1
> *CLI>
> I know I have audio going into the device.  When I made the 
> modifications to the usb device, I decided not to remove the audio 
> output jack so that I may use it for testing purposes.  So I plugged 
> some speakers in, went into alsamixer, un-muted the microphone, turned 
> it up a little, and I had sound from the radio without any problems.  So 
> why can't asterisk hear the sound when tuning?  Have I forgotten to do 
> something else before trying this?
> Jeff
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