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Is it possible for a Motorola P25 phase 1 Radio to be able to receive a phase II system? Not for transmission, but only for receiving. Thanks.
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Phase I radio on Phase II System?
- Thread starter robertsdoug
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Thanks, that’s what I was afraid of
wtp
Member
i thought is was the when the radio affiliates with the system that talkgroup is then phase 1.
edit from a web page
The two protocols are not compatible. However, P25 Phase 2 infrastructure can provide a "dynamic transcoder" feature that translates between Phase 1 and Phase 2 as needed. In addition to this, phase 2 radios are backwards compatible with phase 1 modulation and analog FM modulation, per the standard
en.wikipedia.org
edit from a web page
The two protocols are not compatible. However, P25 Phase 2 infrastructure can provide a "dynamic transcoder" feature that translates between Phase 1 and Phase 2 as needed. In addition to this, phase 2 radios are backwards compatible with phase 1 modulation and analog FM modulation, per the standard
Project 25 - Wikipedia
Last edited:
That's an optional feature and it's not cheap. Not every Phase II capable system allows Phase I talkgroups. Even if they do allow FDMA talkgroups, they would still need the DDM (Dynamic Dual Mode for ASTRO 25 systems) option for the talkgroup to be able to dynamically switch between FDMA and TDMA, otherwise the mode must be strapped one or the other.
I see that you edited your post as I was typing mine. Note that the dynamic transcoding is something different from DDM. DDM allows the entire talkgroup at all sites to switch between FDMA and TDMA based on affiliated subscriber capabilities (prefers TDMA, falls back to FDMA if a non-TDMA capable subscriber affiliates). Dynamic transcoding allows for a talkgroup to be carried as TDMA on one site and FDMA on another site, to maximize spectral efficiency. So basically if you have a multi-site system and all of affiliated subscribers at 4 of the sites are TDMA capable, but there's an FDMA-only subscriber affiliated at a 5th site, the system can carry that talkgroup TDMA on the 4 and FDMA on the 1 to accommodate the older subscriber without wasting RF resources at the remaining sites.
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Since posting this, I’ve been in touch with the system operator. He advises that they will not allow any phase 1 device on their phase 2 network. So that solves that.
MTS2000des
5B2_BEE00 Czar
My agency has this policy. While most talk groups for primary dispatch are provisioned as DDM, new radios must be TDMA capable, and any new agency wishing to join has to have TDMA capable subscribers. Legacy radios in service can remain until they fail, out of spec, or are replaced- though we may require them be off the system in the future.
No reason to be activating two plus decades old radios when surplus decade old TDMA radios are plentiful.
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