S.I.M. PT1 ???

mciupa

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Moderator
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Nov 5, 2002
Messages
7,372
PT 1 is now showing up on the bottom line in the display on my BCD 436HP, but it's not on every transmission..
I looked it up...it says it is using TIME SLOT 1 ??
What does that mean?
Hi kirk23, so what you are seeing is a P25 Phase II transmission. Phase I shows as P25 on your scanner and Phase II shows as PT0 or PT1.

Phase II is TDMA with smaller bandwidth . You can have two slots per frequency in P25 II. Your 436 can handle this as long as not encrypted.
 

Synchro39

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Feb 7, 2018
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Location
Montreal Quebec
Hi kirk23, so what you are seeing is a P25 Phase II transmission. Phase I shows as P25 on your scanner and Phase II shows as PT0 or PT1.

Phase 2 is TDMA with smaller bandwidth . You can have two slots per frequency in P25 II. Your 436 can handle this as long as not encrypted.
Is the SIM will go encrypted soon ? I hope not!
 

VORTAC

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Dec 22, 2002
Messages
130
Location
Montreal
PT0=Slot 1, PT1= Slot 2.

Montreal firefighters are already using encrypted radio groups. You can see these groups on Radioreference database.
 
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