开云体育

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