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Implement GOLAY paging protocol #5

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opened 2022-07-26 20:31:50 +00:00 by shadowcaster3 · 8 comments
shadowcaster3 commented 2022-07-26 20:31:50 +00:00
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Very few devices survived to this day, but it's seems to be a very good fit as a part of osmocom-analog stack.

Protocol reference
http://www.braddye.com/golay.pdf

GOLAY is capable of

  • Alerts (classic tone only paging)
  • Tone and Voice (speaker activation on alert and recieving radio broadcast)
  • Data paging (numeric and alphanumeric)
Very few devices survived to this day, but it's seems to be a very good fit as a part of osmocom-analog stack. Protocol reference http://www.braddye.com/golay.pdf GOLAY is capable of * Alerts (classic tone only paging) * Tone and Voice (speaker activation on alert and recieving radio broadcast) * Data paging (numeric and alphanumeric)
jolly was assigned by laforge 2022-07-27 17:59:29 +00:00
jolly commented 2022-07-28 19:18:58 +00:00
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Where was it used. USA? What pagers used it?

Where was it used. USA? What pagers used it?
shadowcaster3 commented 2022-07-28 21:48:24 +00:00
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It's paging format developed by Motorola and was used in USA. It predated and later rivaled POCSAG, but was eventually dropped in favor of POCSAG. Was used by Motorola pagers (see link in first message). What is interesting that it has features of both type of pager protocols - voice pages like 5/6 tone pager and numerical/alphanumerical like POCSAG one.

It's paging format developed by Motorola and was used in USA. It predated and later rivaled POCSAG, but was eventually dropped in favor of POCSAG. Was used by Motorola pagers (see link in first message). What is interesting that it has features of both type of pager protocols - voice pages like 5/6 tone pager and numerical/alphanumerical like POCSAG one.
jolly commented 2022-08-06 14:15:41 +00:00
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Can you get cheap devices to play with?

Can you get cheap devices to play with?
shadowcaster3 commented 2022-09-29 20:21:14 +00:00
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Voice is problematic, but tone+numeric+alpha is available for $7 + shipping - see https://www.ebay.com/itm/174989951343 .

Voice is problematic, but tone+numeric+alpha is available for $7 + shipping - see https://www.ebay.com/itm/174989951343 .
shadowcaster3 commented 2022-10-30 21:11:49 +00:00
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Tested for tone, numeric and alpha. Confirmed working.
Note - message type should be decopled from station id. It's arbitrary mapping during pager programming. Any station id can recieve any message type if programmed and capable to do so.

Voice pages not tested.
Relatively cheap and working voice, capable golay pagers are available here:
https://shop.mechemelectronics.com/searchquick-submit.sc?keywords=A03DPC6662AC+
It's Motorola OPTRX.

I have one and can test voice messages once they are implemented.

Tested for tone, numeric and alpha. Confirmed working. Note - message type should be decopled from station id. It's arbitrary mapping during pager programming. Any station id can recieve any message type if programmed and capable to do so. Voice pages not tested. Relatively cheap and working voice, capable golay pagers are available here: https://shop.mechemelectronics.com/searchquick-submit.sc?keywords=A03DPC6662AC+ It's Motorola OPTRX. I have one and can test voice messages once they are implemented.
shadowcaster3 commented 2023-09-21 06:11:37 +00:00
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#15

https://gitea.osmocom.org/cellular-infrastructure/osmocom-analog/pulls/15
shadowcaster3 commented 2023-10-08 16:54:53 +00:00
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Tone, Numeric, Alpha and Voice pages tested with Motorola OPTRX.
Also tested respective functions with Motorola PMR 2000 (T, A, N) and Motorola Sensar (T, N)
Confirmed working.

Tone, Numeric, Alpha and Voice pages tested with Motorola OPTRX. Also tested respective functions with Motorola PMR 2000 (T, A, N) and Motorola Sensar (T, N) Confirmed working.
shadowcaster3 commented 2023-10-08 17:07:22 +00:00
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Of course, it's only the transmitter that has been implemented at this point. The receiver portion is currently a placeholder.

Of course, it's only the transmitter that has been implemented at this point. The receiver portion is currently a placeholder.
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Reference: cellular-infrastructure/osmocom-analog#5
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