[App_rpt-users] Beagle Bone DTMF issues

[Doug Crompton]

Eric,

 Glad to hear you got it going. plfilter when activated applies a highpass filter to help to eliminate incoming PL tones. They are not so noticable on a handheld but would be very objectionable on an iaxrpt connection with full range speakers. 
73 Doug
WA3DSP
http://www.crompton.com/hamradio


From: EUglum at aol.com
Date: Mon, 22 Dec 2014 14:24:43 -0500
Subject: Re: [App_rpt-users] Beagle Bone DTMF issues
To: doug at crompton.com






  Thanks Doug! De-emphasis was set backward on the 900 repeater. DTMF 
works like magic now. Just for my own education, what does plfilter do? Many 
Thx!
 
-Eric (KB6BZZ) 
 

In a message dated 12/22/2014 9:33:10 A.M. Pacific Standard Time, 
doug at crompton.com writes:

  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 at aol.com
Date: Mon, 22 Dec 2014 11:57:29 -0500
To: 
  app_rpt-users at 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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