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Zetron Decoding
- Thread starter KG5HHS
- Start date
- Status
Do you have any recordings of the data bursts?
The zetron brochure says it's a 1200 baud FSK data burst which means it should sound similar to Fleetsync, MDC-1200, LoJack, or the always annoying 'This is a test of the Emergency Broadcasting Service' burst you hear over your TV.
Denny
ScannerSK
Member
Last edited:
The Zetron Model 6/26 fire station alerting system uses a CML/MX-COM 429A MSK modem IC. The data format should be similar if not identical to MPT-1327 (MSK 1200/1800 Hz, 1200 baud):
MPT-1327 Decoders - The RadioReference Wiki
MX429A Datasheet pdf - 1200/2400bps MSK Modem for Trunked Radio Systems - MXCOM
MPT-1327 Decoders - The RadioReference Wiki
MX429A Datasheet pdf - 1200/2400bps MSK Modem for Trunked Radio Systems - MXCOM
Here's a decode of the recording that Shawn posted:
I can add support to decode this in sdrtrunk. But, it would be much easier to figure out the message formats if someone has access to a zetron system and could run it through each of the messaging options while recording the data bursts and then providing the identifiers.
It looks like the unit IDs are in bit fields 13 - 24. In the above example, units 6,7,8,10,12 and 13 are being paged, I think.
Denny
Code:
revs sync 48-bit message 16-bit CRC or 15-bit CRC + even parity bit
1010101010101010 1100010011010111 101000100001000000000110000000000000000110001100 0010010010001110
1010101010101010 1100010011010111 101000100001000000000111000000000000000110001101 0100001000011011
1010101010101010 1100010011010111 101000100001000000001000000000010000000110001010 1101000100100010
1010101010101010 1100010011010111 101000100001000000001010000000000000000110001111 0101101111011111
1010101010101010 1100010011010111 101000100001000000001100000000000000000110000000 1000110110101001
1010101010101010 1100010011010111 101000100001000000001101000000010000000110000001 1101110000001100I can add support to decode this in sdrtrunk. But, it would be much easier to figure out the message formats if someone has access to a zetron system and could run it through each of the messaging options while recording the data bursts and then providing the identifiers.
It looks like the unit IDs are in bit fields 13 - 24. In the above example, units 6,7,8,10,12 and 13 are being paged, I think.
Denny
Last edited:
I don't think the Zetron will decode as MPT-1327. Zetron uses the same 1200-baud FSK modulation and sync pattern as MPT-1327, but the message structure and error correction bits appear to be different.
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