[chirp_users] Fire paging (was: Baofeng UV5R dtmf on receive)///

John LaMartina ☀
Sun May 26 13:08:28 PDT 2013

Bear is correct.
Before we went digital in York County, PA, we used Motorola and Plectron monitors. The Dual paging tones are not the same as DTMF, which is Dual Tone Multi Frequency (used on telephones).
Unfortunately, the UV5R doesn't have that capability.

John K3NXU 

Sent via iDroindleBerry

On May 26, 2013, at 1:34 PM, Bear Albrecht <ebear422 at gmail.com> wrote:

> On 5/26/13 11:10 AM, Brad NK8J wrote:
>> Most Fire Stations and ambulances require DTMF Tones to tell them which
>> station is being sent out to where.  
> Well, not exactly.  The system here is "two-tone" which has one single tone transmitted for a couple of seconds and then another single tone for a couple of seconds.  Precise timing I can look up on Tuesday if needed.  Google "two tone paging" for some of the angles.  http://www.batlabs.com/qcii.html has some of the info although it doesn't cover what we use, nor several other variants.
> One of the tone plans out there is called "Plectron"; it's used in the next county to the north.  In this county we use the Motorola tone plan.  Here's a sample:  The first column is Motorola's "hex code" (why they call it that I don't know but that's what we put into the dispatch console to specify the tone pairs), and the other are the two tones sent in sequence.  (Missing initial columns are the various people's names and call signs.)  One annoying thing     about Motorola's approach is that they include frequencies below 300 Hz and I have removed them whenever possible.  Icom and Kenwood radios can be set up to double as pagers but they don't work well with 296.5 and basically don't work with 288.5
> 3800	553.9	1092.4
> 3855	726.8	953.7
> 3801	903.2	1063.2
> 3898	903.2	1034.7
> 3803	553.9	304.7
> 3804	553.9	313.0
> 3808	533.9	1034.7
> 3818	584.8	1034.7
> 3807	553.9	1006.9
> 3815	584.8	953.7
> DTMF is another whole thing.  It's one of many possibilities for ARES paging that we need to figure out.
> ;B
> -- 
> Bear Albrecht  W5VZB
> San Antonio, New Mexico
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