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DMR and two tone

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LowderK

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Well not trying to beat a dead horse.... but has anyone found a okay or cheap way to send twotone across DMR....??? I have an old Midian PDE-1 has anyone ever tried that i to the back of a xpr 4550 or xpr 2500...?
 

buddrousa

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2 tone and any Digital Format is a nightmare they are still having issues with 2 tone and P25 not a do it yourself project.
 

TampaTyron

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There is a group that I have worked with who have done 2 tone over Capacity Max systems with option board code. Not sure if your budget allows for a company to help you with this project. How important is the 2 tone to your operations? TT
 

LowderK

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I just need the base radio at dispatch to send the two tone I don't need the end user radios to decode it for say just to hear the tones through the speaker..
 

GTR8000

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2 tone and any Digital Format is a nightmare they are still having issues with 2 tone and P25 not a do it yourself project.
Most tones will sound distorted from what I have heard.
From personal experience with QCII paging on a P25 Phase II system (TDMA talkgroups) with APX subscribers decoding those tones (Tone Signaling feature), they are every bit as reliable as analog paging being decoded with Minitors. The tones are generated in the subscriber by the AMBE+2 vocoder, so you wind up with a faithful reproduction. Of course it helps when the tones are being encoded by MCC 7500 consoles. If you try the same with a tone encoder designed for analog modulation, well then good luck. But to say that tone paging over digital is a "nightmare" is simply not accurate.
 

wa8pyr

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From personal experience with QCII paging on a P25 Phase II system (TDMA talkgroups) with APX subscribers decoding those tones (Tone Signaling feature), they are every bit as reliable as analog paging being decoded with Minitors. The tones are generated in the subscriber by the AMBE+2 vocoder, so you wind up with a faithful reproduction. Of course it helps when the tones are being encoded by MCC 7500 consoles. If you try the same with a tone encoder designed for analog modulation, well then good luck. But to say that tone paging over digital is a "nightmare" is simply not accurate.
The key is having the AMBE+2 vocoder in the sending radio. We're doing tone paging over P25 Phase I using Harris XG75M control stations and Zetron Max consoles. The outgoing tones sound good and clean, and it sounds pretty clean at the receiving end for a variety of radios, including old M7100/P7100 and XTS/XTL stuff; even sounds reasonably decent from a scanner.

However, sending tones with anything older (Harris M7100, Moto XTL, etc) and you might as well forget it. Most tones will sound nasty.

Of course, the only radios we can decode with are those properly equipped for P25 paging. It's mainly moot since the tones are also going out over the analog paging channel, which is the primary alert channel. Paging over P25 is there in case any agency wants to implement Unication G4 or G4 pagers (with which it works great).
 

Firebuff880

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Of course it helps when the tones are being encoded by MCC 7500 consoles. If you try the same with a tone encoder designed for analog modulation, well then good luck. But to say that tone paging over digital is a "nightmare" is simply not accurate.
I will second this, although the Avtec Scout (with the "Radio Driver") is a better option for the MOTOTRBO / DMR platform.

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buddrousa

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But as stated it is not a do it yourself project you need all the test equipment
 

JRayfield

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Sending two-tone tones over MOTOTRBO is not a problem at all. I set up a hospital/ambulance system that uses the text messaging for 'activating' portables for calls, but they still like to use the two-tone paging tones as 'alert' tones. They sound crystal clear. In this case, they're being generated by Telex CSoft consoles into XPR5350 control station radios. Most of the portables are XPR6550s.
 

LowderK

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Everyone thanks for all the good info on this subject.... I'm going to try the Midians tone controller I have and go from there
again thanks for all the help
 
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