I'm in need of information. We have a MCC7500 motorola dispatch console, P25, Astro digital 711 system. We want to send audible tones over our radio frequency, we have been told no way we can do it. Does anyone have any suggestions on how to do this. Again it needs to be a audible tone.
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Fire station alert tones
- Thread starter davidland
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SteveC0625
Order of the Golden Dino since 1972
Are you trying to alert pagers like the Minitor V? Or are you trying to alert fire houses via conventional alerting receivers of some kind?
Or are you trying to send some kind of alerting through to P25 radios at the fire houses?
I can tell you now that P25 systems can not talk to conventional receivers like the Minitor V. Period. That's a hard fact.
This document may shed some more detailed light on your question: http://forums.radioreference.com/at...aging-station-alerting-p25-trunking-world.pdf
I also did a google search on "p25 paging" (without the quotes) and there are dozens and dozens of hits on the topic, all pretty much the same. P25 and paging as we know it don't mix.
What many agencies that migrated to P25 have done is to maintain an analog narrow band transmitter that is used exclusively for paging out to radios like the Minitor V on either a VHF or UHF frequency. If that is all the channel and transmitter is used for, quite a high volume of fire and ems paging can be done in a very effective and cost efficient way.
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W2NJS
Member
For complex technical reasons (most of which are beyond my comprehension), a P25 digital system is absolutely awful for transmitting audible tones. The tones tend to warble and get very distorted. It's the nature of the beast, unfortunately.
n2hbx
Member
Another solution would be to alert the stations using the Private Call function. That's what Orlando and Apopka FD's did here in central Florida when they went to 7.x.
If you wanted to, you could still send alert tones over the P25 channels as an attention-getter.
Larry
If you wanted to, you could still send alert tones over the P25 channels as an attention-getter.
Larry
If all you're looking to do is send some kind of noisemaker over the radio to get people's attention, surely there must be a way to make that happen. I haven't used any full ASTRO or P25 dispatching equipment myself (yet..) but the system manager should be able to configure it to send a noisemaker at the dispatcher's discretion, if it's anything like Centracom Elite.
If you're looking to send and then receive/decode a tone, that's where things fall down. My understanding is that the audio compression and modulation involved in changing the signal to/from digital puts the tone value outside the tolerances permitted for a tone alert. In simpler terms, if you are generating 707.3Hz, it might come back out at the other end as 702Hz - which won't trigger the tone decoder.
If you're looking to send and then receive/decode a tone, that's where things fall down. My understanding is that the audio compression and modulation involved in changing the signal to/from digital puts the tone value outside the tolerances permitted for a tone alert. In simpler terms, if you are generating 707.3Hz, it might come back out at the other end as 702Hz - which won't trigger the tone decoder.
n2hbx
Member
P25 Tones
Motorola consoles can send tones out over a P25 channel all day long, too. Our 7.x users send out pre-alert and attention tones all the time. But, as has been pointed out, don't depend on them to open toned receivers.
Larry
Motorola consoles can send tones out over a P25 channel all day long, too. Our 7.x users send out pre-alert and attention tones all the time. But, as has been pointed out, don't depend on them to open toned receivers.
Larry
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Thanks for all the help on this matter. Our radio people are looking how to send an audible tone of the radio. Evac tones would be a example not to open a page or monitor. If you know this can be done could you please put my in touch with someone who can help us.
Thanks for all the help on this matter. Our radio people are looking how to send an audible tone of the radio. Evac tones would be a example not to open a page or monitor. If you know this can be done could you please put my in touch with someone who can help us.
I would think your local MSS or radio vendor could do this very simple. In our county they send alert and evac tones all the time.
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