"The wheels on the bus go round and round..."

[BinaryMode]

I decided to try my hand at monitoring a NXDN trunked system and the first candidate was the R2J school busses. But I'm a little puzzled. The database lists only three frequencies for Larimer. Yet in the ULS there's 28! Granted I know some of those 28 are inputs, I don't understand why there are this many and only three in the RR database? Are some of the frequencies missing or am I not understanding something here?


Also, why the odd wattage all over the map from 25 to 40, to 50 to 90? The lower wattage frequencies would no doubt be the bus I imagine. Which would be MO6 and MO8. But look at all the fixed frequencies!

 

[n3obl]

the lower mhz freq FB6 Are the repeater output while the mo6 mo8 are the input to said repeaters.

 

[KevinC]

And once you drill down to just that one site it's 11 repeater outputs.

 

[BinaryMode]

So am I to understand this callsign is for more than one tower?

Also, how do you come up with 11 outputs? I count 5 FB6's. I guess I just don't understand how the FCC lists things.

So in a nutshell, am I missing frequencies for this system other than the three listed in the RR /db?

Thanks.

Edit-

Ah, I count 11 for LOC #1.

Edit 2-

So I count 5 FB6's for LOC #1. So I'm missing 2 output frequencies?

Edit 3-

It's looking like they are FB8's with 50 watts output. If so, I may be missing the following:

463.81875

464.03125

463.21875

Again, this is for Larimer.

 

[natedawg1604]

If you don't have it already, I would strongly suggest getting a RTL SDR dongle or 2 along with DSD+ Fastlane, that will help you log & monitor 24/7 new/unidentified DMR & NXDN systems. Also, I wouldn't spend too much time looking at FCC data, it's a lot easier to run bandsearches with your scanner in Commercial VHF & UHF bands, and then log/monitor those freqs with DSD+ Fastlane and/or your scanner.

 

[BinaryMode]

I have two SDRs. How about DSD-FME? LOL (Florida man edition...)

I'm now wondering if SDRTrunk will help? Been a while since i used that application.

I'm thinking another possibility would be to use one frequency trunk and watch what the voice channels use for an output frequency. No?

 

[natedawg1604]

I have two SDRs. How about DSD-FME? LOL (Florida man edition...)

I'm now wondering if SDRTrunk will help? Been a while since i used that application.

I'm thinking another possibility would be to use one frequency trunk and watch what the voice channels use for an output frequency. No?

DSD+ Fastlane is by far the most sophisticated program for monitoring & logging NXDN & DMR systems, AFAIK there are no comparable alternatives for those 2 protocols. The other programs (Unitrunker, OP25) are mostly geared towards P25. Don't even waste your time thinking about it, just install DSD+ fastlane and be done with it. It costs $10 a year or $25 for a lifetime subscription.

You certainly can monitor a control channel in one-frequency trunk mode (I'm assuming with an SDS?), but DSD+ fastlane gives you 24/7 logging & monitoring capabilities far more sophisticated than what the SDS will provide.

 

[scanlist]

You are on the right track with the ULS listing. Site 1 Green Mountain Larimer county.

If you really wanna hear buses RTD has a big block on DTRS. Some of their TG's are heard on the Buckhorn DTRS site.

"Another One Rides The Bus"
"Weird" Al Yankovic.

.

 

[Spitfire8520]

The license is on the odd side. My two cents is that the license is for two separate systems co-located at one site for Location 1 based on the licensed emissions, which corresponds to the stuff you see with FB6 vs. FB8 and the different licensed ERP.

Six frequencies are licensed as 4K00, FB8, 75W ERP. This is NXDN 6.25 kHz, which is in the database as NXDN48/4800.

• 461.88125
• 463.21875
• 463.41875
• 463.54375
• 463.81875
• 464.03125

Five frequencies are licensed as 8K30, FB6, 130W ERP. This is NXDN 12.5 kHz, which is in the database as NXDN96/9600. They are also licensed for 11K2F3E analog voice, but it is uncommon to operate in that mode when licensed for digital voice.

• 463.3125
• 464.0625
• 464.3625
• 464.8375
• 464.5750

Database wise, the policy is to only list frequencies that are confirmed in use through direct observation and not what is licensed. It is not uncommon for folks to license more frequencies than they end up using, perhaps thinking they will have room to expand in the future. I do not know the stance the FCC has on frequency hoarding.