- Joined
- Nov 16, 2004
- Messages
- 2,049
Correct, you need to program each site into a P25 trunked system. You could also just lock-out (avoid) the active control channels as they will not have voice traffic on them.
Yes, you will need a new scanner.I have a BCD396XT so I assume I'm going to need a new scanner once they switch to the new system. Any recommendations? I'm in Boone County and really only interested in picking up Boone county.
It looks like new amended applications have been submitted. They were requested to submit an RPC approval letter from region 17 (Indiana) and they have now included that letter.
Of note, they still only have 4 frequencies for Campbell County (even though the control channel is advertising frequencies not on the application) and they only have the P25 TDMA emission designator (9K80D7W) for the frequencies. Most systems also include a Phase I designator being that the control channel is always Phase I and the system should be capable of reverting automatically to Phase I if it is keeping with the P25 standards.
Another note, they are already transmitting on frequencies that they have not yet been licensed for.
What are they trying to do here? Just wing it?
I will need to reread my TIA documents. I thought automatic 'fallback' to Phase I (FDMA) was a requirement of the Phase II (TDMA) standards. Also, the control channel is operating FDMA (I also though this was a Phase II requirement) and they are already transmitting data on the system in FDMA mode.And as to the statement about any P25 system having to have FDMA use to be compliant... NOPE. Phase II is a standard all its own. You can go pure TDMA from the rip and not ever have any need for FDMA on any part of it. If you have need of interop with another system that is FDMA, or analog, you set up patching, or ISSI linkage. There is no part of anything saying that you must use a DDM set up to meet any part of any standard.
I will need to reread my TIA documents. I thought automatic 'fallback' to Phase I (FDMA) was a requirement of the Phase II (TDMA) standards. Also, the control channel is operating FDMA (I also though this was a Phase II requirement) and they are already transmitting data on the system in FDMA mode.
The FCC applications were returned today so it looks like more delays.
Tom, there is also ISSI linking that can be done. FDMA on the SAFE-T and MARCS-ip sides and TDMA on NKYRRS