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Motorola "chirping"

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Mr_Observer

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You are hearing full length MDC 1200 however the receiver is using DOS muting to partially blank it out. If the DOS mute settings are not just right you will hear a MDC chirp just like that.
 

Astro25

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That sounds like way too much DOS muting.

Sounds to me like Astro TPSK FDNY signalling. It uses a short burst of P25 data to send a longer ID #. That's probably what it is, although I have never heard it before so it's just an assumption...



Astro25
 

FF86

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I've found out it is indeed some sort of P25 data burst for radio ID use. (FDNY uses 7 digit radio id's).
Now the question is if its a short P25 burst before and/or after a conventional analog transmission, is it a true "P25" feature or a proprietary motorola feature which requires their Astro product??
 

ke5fgc

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I have seen this flash port option before. Supposedly its using Astro Signaling on an Analog Channel

G857-FDNY Emergency Rx/Tx Tone Set
 

AlexC

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Your correct, they are using P25/Astro signaling with conventional analog voice. You do not specifically need G857 for this feature to work, it's called Tactical Public Safety and is avaliable in any Astro25 radio.

The FDNY option changes the algorithm that the radio follows when the ebutton is pressed. There may be one or two other things that it does, but the TPS is not a function of the FDNY option.

Any Astro25 platform radio which has a 5 as the first digit in the flash code and a display should be able to decode TPS ID's.

See the help file in CPS on how to properly program these channels.

Alex
 

KC2YSI

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Thank you Tom, winmdcd will only decode the MDC-1200 signal. I'm more concerned with the ASTRO25 part of the signal. All the software I have found so far to decode ASTRO25 is for the control channel, and expects the entire communication to be digital.
 

KC2YSI

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That sounds like the reminder chirp from a radio that the emergency signal has been activated. From the other audio, it sounds like MDC-1200 signaling, which supports emergency alarms. Usually, to turn off this reminder, you have to turn the radio off then back on (to prevent accidental clearing of the alarm).
 

gtaman

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It's definitely MDC1200 DOS muting. It almost sounds like pre DOS muting if it's possible. I recall if you use MDC emergency functions it will DOS mute all pages and IDs.
 
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