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Improper Channel Spacing

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mikewazowski

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Apparently it is a valid step but the software the OP is using doesn't support it.
 

merlin

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OK, I read up a bit about the site OP is wanting to monitor.
It looks to be an 'explicit mode' and still has 12.5 Khz channel spacing.
773.93750 Mhz it the downlink frequency, 803.93750 Mhz uplink.
I posted about this issue a while back. Check out post #9. The pre-XL radios will not support new TDMA CC functionality either. These radios will become more obsolete as time goes on.

RPM14 Programming Trunked Frequency Sets
ANY of the OMAP radios with features 39 and 47 will do P25 p2 very nicely
 

mikewazowski

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OK, I read up a bit about the site OP is wanting to monitor.
It looks to be an 'explicit mode' and still has 12.5 Khz channel spacing.
773.93750 Mhz it the downlink frequency, 803.93750 Mhz uplink.
Who said anything about 700MHz channels? This whole thread is about the inability to program in an 800MHz channel.

OP is using 14C05, same as me, and I have no issues at all.

Besides not understanding what this thread is about?

OP replied on another forum that his issue was with using an older version of software:

(4) 800MHz Control Channels | Communications Support Forums
 

nikronzo

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OK, I read up a bit about the site OP is wanting to monitor.
It looks to be an 'explicit mode' and still has 12.5 Khz channel spacing.
773.93750 Mhz it the downlink frequency, 803.93750 Mhz uplink.

ANY of the OMAP radios with features 39 and 47 will do P25 p2 very nicely
Phase 2 Trunking is not the same as TDMA Control Channels. TDMA CC is a functionality only the Harris XL platform can/will support.
 

BMDaug

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Phase 2 Trunking is not the same as TDMA Control Channels. TDMA CC is a functionality only the Harris XL platform can/will support.
6.25KHz channel spacing shouldn’t necessarily dictate a TDMA CC right? I haven’t looked at the system, so it may also use TDMA CC, but that channel spacing should be available using RPM2 regardless. If he’s able to grab the control channel from adjacency data, it must be FDMA since he’s not using an XL…

-B
 

adamr368

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Appears to be an FDMA control channel based on 12.5 MHz bandwidth - just unusual spacing. It's a known LCN, even to an R2760b service monitor, which is Phase 1, so it had to be part of the "plan," just not used until now.

1679659624668.png
 

nikronzo

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6.25KHz channel spacing shouldn’t necessarily dictate a TDMA CC right? I haven’t looked at the system, so it may also use TDMA CC, but that channel spacing should be available using RPM2 regardless. If he’s able to grab the control channel from adjacency data, it must be FDMA since he’s not using an XL…

-B
I was just pointing out that the two things are seperate, I highly doubt the OPs system is using TDMA CC as I believe that the Harris built America Electric Power trunk is the only TRS utilizing TDMA CC currently deployed.
 

GTR8000

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It's an ASTRO 25 system, they don't have TDMA control channels yet.
 

BMDaug

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I was just pointing out that the two things are seperate, I highly doubt the OPs system is using TDMA CC as I believe that the Harris built America Electric Power trunk is the only TRS utilizing TDMA CC currently deployed.
Totally! I’m still learning so I just wanted to make sure I understood how stuff worked.

Thanks,
Brian
 

nikronzo

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Yes, however that's an L3Harris system, not Motorola ASTRO 25. The sites that have confirmed TDMA control channel usage are flagged with a T icon on yellow background.
Yes, I just wanted to make sure we were both referring to the same Harris system that is using TDMA CC and not the OPs system. Anyways straying off topic anyways :)
 
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