My thinking is your problem is either levels or maybe you are running non deemphasized audio with simpleusb causing unequal tome levels. If so you need to program the Motorola for deemphasized audio out OR set the deemphasis=yes in simpleusb.conf. You should also run plfilter=on which is the default.

Skewed equalization can definitely cause poor or no DTMF decoding. The radio relaxed should have nothing to do with it.

The BBB DTMF decoding works fine if the levels and equalization are correct out of the radio.

YHou also need to use preemphasis going into the Motorola with simpleusb or your audio will sound flat (lacking high-end) at the other rx end. There is no SW setting for this.

73 Doug
WA3DSP
http://www.crompton.com/hamradio

From: EUglum@aol.com
Date: Mon, 22 Dec 2014 11:57:29 -0500
To: app_rpt-users@ohnosec.org
Subject: [App_rpt-users] Beagle Bone DTMF issues

I just successfully installed Doug's (WA3DSP) Beagle Bone Black installation on a two node repeater system using two URI's and a Belkin 4 port USB hub in an attempt to remove my power hungry old P4 rack server from All Star service. Everything seems to be running well on the BBB with only 14% CPU usage on stand by (2 nodes) and little to no audio distortion while testing.

I am having a heck of a time getting either node to reliably decode DTMF especially when using Motorola transceivers. (On the old P4 server, the DTMF decoded remarkably well using any radio...) I have been looking at the old P4 config files and comparing them to the BBB config in an attempt to see what has changed... Doug has "radio relax" turned off by default (normally on by default in the acid release). Is this relevant? Thanks!

-Eric (KB6BZZ)

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