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----- Original Message -----
From: "wj9jrg via groups.io"
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 groups.io >

[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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