I have a Wouxun UV6D that I usually leave in dual channel mode and scan the county dispatch channel on 1 and my fav repeater on the other. Problem is, that its a county line. I'm really only interested in hearing my town's dispatchs. But I am not to familiar with how tones work for the paging system. I gave it a once over on wiki (pretty sure our city uses motorolla monitor system pagers) it looks like the pagers are just scanners that squelch out until opened by an AUDIO tone (please correct me if I'm wrong, a DTMF maybe?) instead of a continusouly broadcasted subtone like one would use to access a repeater. Then stays open for a set number of minutes as programmed then back in standby until the audio tone is heard again.

Now I assume repeaters listen for subtones before transmitting in the same way pagers do for opening squelch. Is that an accurate comparrison?

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If so, I'm guessing that my wouxun can be set up to ignore incomming audio unless its the correct tone (making it a fire pager)? Are there any HT hams that have this feature if not? « Last Edit: December 17, 2012, 07:01:32 PM by GRANDKODIAK » Logged. Download Event Log Analyzer Keygen For Mac. If you are hearing two tones, it's probably the old 'two tone sequential' paging standard. Your HT probably doesn't have the ability to work with two tone sequential.

Most amateur repeaters use a continuous sub-audible tone. That's a continuous low-frequency tone that is below the audio range of the receiver so that you don't hear it. There are also some newer standards like Digital Coded Squelch (DCS) where a burst of data is sent at the beginning of a transmission in order to open the receiver squelch.

That's good for when you have a lot of different 'talk groups' on frequency that you might want to selectively activate. Yea looks like the Motorolla system is an audible version of CTCSS.

I had the idea to set a CTCSS for the first tone to at least block any dispatch that didn't share the same first tone (or second if there were too many) but I forget CTCSS stops at below audio. I found the audio values though if anyones curious. The dispatch uses one frequency but depending on what town they are calling, they send out a 5 second burst of 2 audible tones, the first for 2 seconds, the second for 3 seconds. In my case, my towns first tone is 1232hz and second is 643hz.

If you listen to the frequency you will hear the tones, just flat tuning fork type alert noises. But each pager is set so when it hears that signal, it opens the squelch to listen to the frequeny for a set period of time then goes back into mute until it hears those specific notes again. CTCSS only goes from 67hz to 254hz. So my idea of using a single tone open option woudlnt work, and ALSO because its only sent at the beginning of a transmission, and not as a subtone for the duration of the broadcast like with CTCSS.