[App_rpt-users] usbradio pre- & de-emphasis

Tim Sawyer tisawyer at gmail.com
Wed Jul 12 22:30:15 EDT 2017

In my estimation it's best to let the radio do the filtering whenever
possible. It's not that app_rpt does anything bad, it does a perfectly find
job. I just think the filtering and limiting in the radio will work and
sound as intended by the manufacture. Of course there are always exceptions
and extenuating circumstances... ymmv.

On Tue, Jul 11, 2017 at 12:05 PM, Kevin Custer <kuggie at kuggie.com> wrote:

> Sounds like you're de-emphasizing the RX audio and not pre-emphasizing the
> TA audio, but should be.
> The exact set-up is determined by the radio and what it wants/needs.  What
> radio are you using and how do you have it connected?  What radio adapter
> are you using?
> Kevin
> On 7/11/2017 1:42 PM, Bob Pyke wrote:
>> When I first setup a RPi with DIAL on our repeater, it sounded tinny, and
>> I made a change in configuration in usbradio that de-emphasized the audio.
>> It was too much, loosing too many of the higher frequency components that
>> make for clarity of audio. I'm looking for information on what settings
>> (e.g. dsp, and the rx and tx settings, =flat, =speaker, etc) that have a
>> pre- or de-emphasis effects in app_rpt. A general discussion would be
>> useful as well. I can address this in hardware, but wanted to explore the
>> software approach first.
>> Thanks,
>> Bob
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