CH ID Table not matching radio

[SlipNutz15]

I’m always trying to learn and today is not different. I monitor a local VHF trunked system and noticed the towers are transmitting a different channel ID table than what on-system radios have programmed in them.

What is the purpose of the varied info between the two? I was under the impression the ID tables were to match?

 

[Outerdog]

How are you making this determination?

 

[SlipNutz15]

How are you making this determination?

This is what is being transmitted from the system...

 

[SlipNutz15]

How are you making this determination?

This is what is in the radios

 

[SlipNutz15]

How are you making this determination?

Now I understand the system is Phase 1 VHF, so I'm guessing most all of the data from the CC is coming from Slot 5 and the radio is basically ignoring the rest of the info programmed in but I'm confused as why. The radio codeplug that was sent to me by the radio shop who does the system was an APX8000 with Phase 2 capabilities but everything in the radio is programmed as FDMA

 

[clbsquared]

What are you confused about? If you’re trying to monitor a VHF system, all you need to worry about is the VHF band plan.
You received a codeplug from a multi band radio. So, yes, it’s going to have the band plan for each system that’s been programmed into it.
If the VHF system is FDMA, then use the FDMA band plan.
The radio does the rest.
Just because a radio has Phase II capability doesn’t mean it has to be utilized.

 

[SlipNutz15]

What are you confused about? If you’re trying to monitor a VHF system, all you need to worry about is the VHF band plan.
You received a codeplug from a multi band radio. So, yes, it’s going to have the band plan for each system that’s been programmed into it.
If the VHF system is FDMA, then use the FDMA band plan.
The radio does the rest.
Just because a radio has Phase II capability doesn’t mean it has to be utilized.

There is only a single system in the radio. I understand the system being FDMA and the radio using the proper slot. I was just confused why the system broadcasted something different than what the radio had. I’m aware that just because it has TDMA doesn’t mean it needs used. Thank you

 

[clbsquared]

There is only a single system in the radio. I understand the system being FDMA and the radio using the proper slot. I was just confused why the system broadcasted something different than what the radio had. I’m aware that just because it has TDMA doesn’t mean it needs used. Thank you

Most likely the system was set up to be used on two bands. Are there any neighboring agencies using 700/800 that dispatch can patch through or ability to contact via console?

 

[SlipNutz15]

Most likely the system was set up to be used on two bands. Are there any neighboring agencies using 700/800 that dispatch can patch through or ability to contact via console?

Nope. Only surrounding is VHF and a UHF TRS and there’s no UHF in the radio. Like I said it’s just the single system loaded in the radio. I was just trying to learn why the slots’ types and the last VHF didn’t match up. That’s all.

 

[GTR8000]

The correct answer was given in your duplicate thread in the Pennsylviania forum, which is that someone very clearly screwed up the channel ID table in the APX codeplug. Anyone who has spent 5 minutes programming an ASTRO 25 system into an APX would see the errors jump right off the page.

 

[SlipNutz15]

The correct answer was given in your duplicate thread in the Pennsylviania forum, which is that someone very clearly screwed up the channel ID table in the APX codeplug. Anyone who has spent 5 minutes programming an ASTRO 25 system into an APX would see the errors jump right off the page.

Figured as much. I just wanted to make sure it wasn’t some weird trick I didn’t know about. You may lock this thread now. Thank you sir.

 

[GTR8000]

Also note that VHF systems can use explicit signaling to direct the subscribers to specific RX/TX frequencies, effectively bypassing the channel ID table.