Megahertz Change?

[riverradio68]

Caddo Mills has 3 frequencies licensed to Megahertz which are emitted for DMR, Have you looked at that site to see if its part of either network?

One of the reasons Megahertz dropped McKinney was that TI had such great coverage to the North. I get 3 bars steadily at night off TI.

 

[littona]

Is the hytera stuff certified by the FAA fro flight use? Careflite helos use that system.

Very unlikely. It's pretty much only Technisonic and a couple of others that make FM aircraft radios that are FAA certified. (Supplemental Type Certificate (STC) Approval) They're all Motorola APX-based. However, if your local FAA inspector is willing to sign off on the install, you can install a mobile radio. That's getting rare these days. Of course, government operated helos, like police, don't have to follow the same rules.

 

[mwjones]

The Hytera Tier III site in Howe started reporting two new sites (Region 2, sites 1 and 2) today - of course with the neighbor list not giving a valid control channel ID (and it shows all sites as neighbors, so them showing up on Howe does not mean they're adjacent), we'd only be guessing as to where they are, so be on the lookout for them.

 

[riverradio68]

The more I read about Hytera Tier III system to more confused I get. The technology is pretty impressive. TAIT is jumping on it and in the rest of the world it may appear TETRA could be replaced by DMR T3. I was even reading about Hytera's HALO network of POC radios. They are huge! Really the only competition Motorola WAVE has out there.

This is off the Megahertz topic briefly, but Dallas Mobile Communications is a BIG seller of Hytera. I wonder if their radio networks are running DMR T3?

Is there (I'm sure there is) a Software program that can be run with an SDR that will only hunt down DT3 signals ignoring everything else? I am wondering just how large the new Megahertz DT3 system is and whether it's being shared by other communications companies?

I'm searching the Caddo Mills Megahertz system but I really need a UHF yagi pointed at it. My omni signal is weak thanks to Intermod alley Greenville.

Good stuff MW!

 

[mwjones]

My discovery process is multi-step. I typically start with my SDS100 in scan mode, scanning the particular band of interest (for example last week I was on an out-of-state road trip, and the Tier 3 system I was looking for is in the 935-939MHz range, so I searched that band). If I see a T3 signal come in, I would input it into DSD Plus on the Laptop with the SDR Radios, and see what came up. If it was the system of interest, I would continue monitoring until I ran out of range or until another frequency of interest came up on the SDS100 to replace it.

I've spent the better part of this evening parsing DSD Plus logs from the road trip (and I'm still not done) gathering the essential data to build a RRDB submission. I've also identified a number of sites that I don't have sufficient data to submit, but I will add them to the system's Wiki for others to research, or for me to go back to those areas when I visit the area again.

If it is an elusive system (for example the Beacon on Capacity+ systems), I will use the wireless survey function on DSD Plus to survey the band, looking for the tell-tale spikes on the graph, which I will then focus my attention on. That's how I identified a hospital that was using one of the 454MHz paging frequencies (not licensed to them) for one of their Capacity+ channels.