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programing tpl/dpl question

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nick223

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We have a neighboring department that uses mabas blue (illinois) as their primary communication channel. They had the channel prior to mabas making it the blue channel.

Question is if the department puts a tpl on both rx and rx or even a dpl on the channel will it close it out so they wouldn't interfere with mabas communications?

I'm getting mix reviews from different people
 
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zz0468

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It depends. PL and DPL is merely a means of selective muting and unmuting receivers. A PL'd receiver will only unmute when a transmitter is sending the appropriate tone, but a signal without the right PL or DPL can still interfere with a signal that has the correct tone.

If two agencies co-share a channel, and they're far enough apart that they can both transmit at the same time, and be heard by their own units, PL can make the situation livable. But if both systems have a large overlap of coverage, PL won't help. There will still be interference.
 
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cabletech

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What type of 'department' is this? If it is a fire, and you both are dispatched by the same center, then you do not want to use any type of pl/dpl.

It would be better to go to a differan tfrequency after tone out.
 
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