[App_rpt-users] Turning RTCM Preemphasis off

Joe Moskalski kc2irv at gmail.com
Tue Jul 11 16:12:11 EDT 2017


I will be separating the voice audio and PL audio using active filters so
that I can inject the PL tone and Transmit audio to separate points on the
transmitter so that the Transmit audio and PL tone level can be adjusted
independently at each transmitter in the simulcast system. Unfortunately
this transmitter adds preemphasis to the transmit audio and this cannot be
changed in the transmitter.

On Tue, Jul 11, 2017 at 4:00 PM, Bryan Fields <Bryan at bryanfields.net> wrote:

> On 7/11/17 3:48 PM, Joe Moskalski wrote:
> > Yeah, that's what I kept seeing, I was hoping there was a way around
> that. I
> > am guessing this can be dealt with in the code but I don't really have
> that
> > ability, external Deemphasis it is then.
>
> A better question,
>
> How are you planing to use PL on transmit but not inject into the modulator
> directly?  If you use a de-emphasized input the PL will be distorted on
> transmit.
>
> --
> Bryan Fields
>
> 727-409-1194 - Voice
> http://bryanfields.net
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