MC2000 paging tones issue

RF_Burns · Post by **RF_Burns** » Tue Mar 07, 2006 10:03 am

It would seem as though the MC2000 "Advanced" deskset does not send paging tones de-emphasised. Hence, low tones transmit at low deviation and high tones are clipping.

Has anyone come up with a work-around for this?

Motorola's answer is it works as designed, so change you paging tones.

Post by **wavetar** » Tue Mar 07, 2006 3:07 pm

What radio are you using as the transmitter? Is it local to the remote, or are you going through phone lines? If it's a 16-pin Motorola radio, are you putting the audio into Pin 2, or Pin 5?

Todd

RF_Burns · Post by **RF_Burns** » Tue Mar 07, 2006 5:24 pm

Its a tone remote version using a Motorola tone remote adaptor into a GM300 .
Audio is going into external mic audio, not flat audio, no choice here. If you put the audio into flat audio the voice message would sound bad.

Actually from the schematics, doesn't matter whether its local or extended, the audio circuitry is the same. Comes out of a codec into a buffer amp and there ya go.

Post by **wavetar** » Wed Mar 08, 2006 5:27 am

RF_Burns wrote: Actually from the schematics, doesn't matter whether its local or extended, the audio circuitry is the same. Comes out of a codec into a buffer amp and there ya go.

Yes, but when you're dealing with phone lines, unless they've been specially conditioned, they attenuate the lower paging tones significantly, and you can't achieve a balance between low-tone deviation, and high tone clipping. When it's a local "in-building" run, this isn't an issue. That's what I was getting at there.

RF_Burns wrote: Audio is going into external mic audio, not flat audio, no choice here. If you put the audio into flat audio the voice message would sound bad.

It actually doesn't sound that bad, and the tones go through much better without the filtering. Otherwise Motorola's correct, you'd need to change your paging tones to something more mid-range, and especially avoid lower tones under 400Hz or so.

Todd