[App_rpt-users] 12.5 kHz repeaters support

Doug Bade kd8b at thebades.net
Thu Mar 11 08:16:10 EST 2010

One of the other distros for getting app_rpt running supports a narrowband
toggle function. It is from www.xelatec.com/. They have a "switch" in the sw
that toggles something in the dsp for 12k5 use. I played with it as our 900
mhz band is mostly 12k5 equipment these days... It did work.. However.. in
general The audio pickup point in the discriminator chain has more to do
with getting enough white noise I think.. I had to play around some in the
900 gear but found points suitable for either distro..


-----Original Message-----
From: app_rpt-users-bounces at qrvc.com [mailto:app_rpt-users-bounces at qrvc.com]
On Behalf Of Jann Traschewski
Sent: Thursday, March 11, 2010 7:51 AM
To: 'app_rpt mailing list'
Subject: [App_rpt-users] 12.5 kHz repeaters support


my 12.5 kHz repeater system has a long noise tail compared to my 20 kHz
repeater system. Both use the USB URI with flat audio and carrier from dsp
in carrier squelch mode.

Moreover the rxnoise tuning comes with a warning:

db0fox*CLI> radio tune rxnoise
tune rxnoise maxtries=12, target=27000, tolerance=2750
tries=0, setting=2, meas=15368
tries=1, setting=4, meas=21645
tries=2, setting=5, meas=26274
tries=3, setting=5, meas=25744
tries=4, setting=5, meas=26047
tries=5, setting=5, meas=26010
tries=6, setting=5, meas=26393
DONE tries=6, setting=312, meas=26393, sqnoise=5990
WARNING: Insufficient high frequency noise from receiver.
WARNING: Rx input point may be de-emphasized and not flat.
         usbradio.conf setting of 'carrierfrom=dsp' not recommended.

New repeater systems in germany are now limited to 12.5 kHz. Would be nice
to build them with the Asterisk/app_rpt system. Are there any plans to
adjust the code for 12.5 kHz systems?

I'll have a talk about the Asterisk/app_rpt system in two weeks at a
conference in germany.


Jann Traschewski, Drosselstr.1, D-90513 Zirndorf, Germany
Tel.: +49-911-696971, Mobile: +49-170-1045937, E-Mail: jann at gmx.de
Ham: DG8NGN / DB0VOX, http://www.qsl.net/dg8ngn, ICQ UIN: 4130182 

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