Re: Flat Audio - Motorola
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IIRC, there are a few boxes you have to correctly set the audio.?? I ran into the same issue first time I did an R1225.
Andy On Wed, May 21, 2025 at 1:41?PM Teton Amateur Radio Repeater Association (TARRA) via <tarra= [email protected]> wrote:
He did say "the "flat audio" check box enabled in the RSS software.".
Mick - W7CAT
----- Original Message -----
From: "wj9jrg via "
To: [email protected]
Sent: Wednesday, May 21, 2025 11:00:47 AM
Subject: Re: [repeater-builder] Flat Audio - Motorola
?> You have to change it in CPS. Show the screenshots from CPS, then we can
?> help.
?>
?> Thanks
?>
?> Andy
?> WJ9J
?>
?> On Wed, May 21, 2025 at 12:39?PM AA7CL via >
[email protected]> wrote:
?>
?> > Good Day All,
?> >
?> > Just reaching out to see if anyone has had any issues with Motorola
?> > RKR1225 repeaters not producing flat audio on pin 11 of the
accessory port
?> > with the "flat audio" check box enabled in the RSS software.
?> >
?> > We have 9 of these repeaters and due to audio quality issues, I
want to
?> > switch the repeaters and links to flat audio. I have struggled with
?> > emphasis and de-emphasis filter paths. Some in the controller, some
are
?> > enabled/disabled in the radios themselves. I have tried to
eliminate it
?> > all by going flat audio. However, the audio links from some of the
sites
?> > are still muddy.
?> >
?> > Using a backup repeater I have, I started investigating the issue.
I have
?> > eliminated the de-emph filters on the controller and enabled flat
audio in
?> > the RKR and Astro Spectra (used for the links) for both TX/RX.
However, on
?> > the RKR1225, injecting a signal set for 3KHz deviation to the
receiver, and
?> > varying the tone, the audio level coming from pin 11 on the RKR1225
is 4V
?> > PP at .600KHz and 650mV PP at 3KHz. Seems to be a lot of roll off
at higher
?> > freqs. I would expect the opposite?? Switching back to "EIA" in the
RKR
?> > doesn't seem to change anything. Again, I'm checking the level
right at pin
?> > 11 - no controllers in line. Is this some impedance issue? Perhaps a
?> > switching issue inside the RKR1225? Today, going to check the output
?> > impedance spec and see if I can load it to see what difference it
makes.
?> > May try another RKR1225 also.
?> >
?> > I've confirmed the modulation of the SM is flat across those
frequencies.
?> >
?> > Thoughts and ideas are appreciated!
?> >
?> > Jim
?> >
?> >
?> >
?>
?>
?>
?>
?>
?>
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