[App_rpt-users] Simplex node with RPi and discriminator audio

[Marshall Oldham]

Keith, 

 

When I have a chance, I will give the USBradio with rx discriminator audio a test on the Pi 3 and tell you what my results are. 

 

I think it just might work fine now that we have a Pi 3's.  

 

73

 

Marshall - ke6pcv 

 

From: App_rpt-users [mailto:app_rpt-users-bounces at lists.allstarlink.org] On Behalf Of Keith Williamson
Sent: Sunday, May 05, 2019 11:37 AM
To: Users of Asterisk app_rpt
Subject: [App_rpt-users] Simplex node with RPi and discriminator audio

 

I'm wondering if this is a realistic configuration for a simplex node:

 

RPi3 with DMK URI connected to the 9600 audio in and out signals of an Alinco DR-135T. I want to be able to use CTCSS so that random signals don't get bridged to connected nodes. 

 

My concern is that with the above configuration, the CTCSS decode in the radio is bypassed. Consequently, CTCSS decode needs to be done via usbradio since simpleusb does not have this capability. However, I keep hearing that usbradio is not handled well with an RPi and yields less than ideal audio quality. 

 

So all of the above implies that I either use a higher performance node PC or continue to use the RPi, switch to the 2400 audio in and out signals (so that the Alinco can handle the CTCSS) and use simpleusb. 

 

Opinions?

 

Thanks,

 

Keith

KF7DRV

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