[App_rpt-users] radio tune rxnoise

[Benjamin Naber]

The RX audio being fed into your allstarlink node URI is too loud.

The target for RX noise is 27000, whereas your levels were a continuous
32767..... which is rather odd as each measurement is exactly the same.

Curious, why are you using DSP for valid RX signal detection? The
BridgeCom repeater has a COR/COS/CAS/whatever output for when a valid RX
signal is present.

~Benjamin, KB9LFZ

On Tue, 2017-06-13 at 22:08 -0400, Ramesh Dhami wrote:
> Hi Guys:
> 
> One of my repeaters, using usbradio, is failing 'radio tune rxnoise'.
> 
> The raw discrim' output from the Bridgecom BCM220 RX is 100mV pk-pk.  In 
> usbradio.conf, I have rxboost set to 1 (20dB attenuator removed).
> 
> The symptom that I am seeing (or hearing) is that the repeater has a 
> hard time distinguishing a weak / noisy signal from "noise".
> 
> This is what I see in the asterisk CLI when attempting a 'radio tune 
> rxnoise'
> 
> tune rxnoise maxtries=12, target=27000, tolerance=2750
> tries=0, setting=2, meas=32767
> tries=1, setting=2, meas=32767
> tries=2, setting=2, meas=32767
> tries=3, setting=2, meas=32767
> tries=4, setting=1, meas=32767
> tries=5, setting=1, meas=32767
> tries=6, setting=1, meas=32767
> tries=7, setting=1, meas=32767
> tries=8, setting=1, meas=32767
> tries=9, setting=1, meas=32767
> tries=10, setting=1, meas=32767
> tries=11, setting=1, meas=32767
> DONE tries=12, setting=63, meas=32767, sqnoise=24631
> ERROR: RX INPUT ADJUST FAILED.
> 
> 
> Unless I am mistaken the above seems to suggest that the ADC is 
> saturated, meaning too much signal??
> 
> I can try to set rxboost to 0 - but of course, this will mess up my 
> rxvoice calibration (assuming that the rxnoise passes).  Is there a 
> mathematical operation I can apply to the rxvoice setting in the 
> radio_tune file to compensate for the 20dB attenuation? (the repeater is 
> at a remote location, which I will not be returning to for another 2 
> weeks or so).
> 
> My usbradio_tune file currently shows:
> 
> [usb_2424]
> ; name=usb_2424
> ; devicenum=2
> devstr=1-1.3:1.0
> rxmixerset=125
> txmixaset=70
> txmixbset=300
> rxvoiceadj=0.316923
> rxctcssadj=0.227263
> txctcssadj=300
> rxsquelchadj=400
> fever=1
> 
> Cheers!
> 
> Ramesh.
> 
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