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

[Keith Williamson]

Hi Marshall,

Thanks!

Would you mind sharing both your usbradio.conf and usbradio_tune_usb*.conf?

Those would provide a great baseline for me. I'll still need to tweak
deviation but your settings should get me close.

73,

Keith
KF7DRV

On Wed, May 8, 2019 at 5:51 PM Marshall Oldham <ke6pcv at cal-net.org> wrote:

> Keith,
>
>
>
> I just had a chance to test out your configuration.  I happen to have all
> the hardware on hand.
>
>
>
> RPi 3 Model B with DMK URIxB connected to an Alinco DR-135 radio set for
> 9600 baud packet. (Discriminator Audio)
>
>
>
> I was able to set the audio levels and CTCSS levels without any issues. I
> used a service monitor to do so.
>
>
>
> Receive and transmit audio sounded fine.
>
>
>
> CTCSS decode/encode on the radio also seems to work using the USBradio
> channel driver.
>
>
>
> DSP squelch works well.
>
>
>
> I ran several tests using 100.0 Hz for CTCSS decode on the receiver.
>
>
>
> There may be one slight issue, but if you are running simplex node at
> home, it may not really be an issue, just something for you to be aware of.
>
>
>
> Here are my findings:
>
>
>
> 88.5Hz = NO decode falsing
>
> 91.5Hz = decode falsing
>
> 94.8Hz = decode falsing
>
> 97.4Hz = decode falsing
>
>
>
> 103.5Hz = decode falsing
>
> 107.2Hz = decode falsing
>
> 1109Hz = = NO decode falsing
>
>
>
> I hope this helps out.
>
>
>
> 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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