Amateur Radio DMR TG 3100 on 408.500

[jgiercyk]

All....I am in Greenville SC. I am hearing an amateur DMR repeater on 408.500, which is outside the 70cm amateur band. It is connected to and repeating TG 3100, which I confirmed via my DMR hotspot. However, the RR database has the frequency listed as:

"National Interagency Fire Center - USA - National Incident Radio Support Cache - Ground Ops - Logistics - Logistics7"

Does anyone know what and where this is?

 

[RBMTS]

While nothing would surprise me from users that know nothing about frequency allocations, I'm wondering if maybe you are hearing a "spur" of the actual frequency. If you have multiple radios, I would try to scan the traditional 70cm amateur frequencies to see if you are hearing the same conversation.

Add: not meaning you in the above comment - rather if a person is running or cross banding a repeater to that actual frequency.

 

[mlindler]

Any recordings you can share? I'll try to monitor today and see what I can grab.

 

[ecps92]

First, are you sure it is Not an image ? or Intermod ?
What Make/Model scanner are you hearing this one ??

Take a second radio and search 144-148 and 440-450 and see if you find a Repeater active with the same traffic
Lets rule out first.

All....I am in Greenville SC. I am hearing an amateur DMR repeater on 408.500, which is outside the 70cm amateur band. It is connected to and repeating TG 3100, which I confirmed via my DMR hotspot. However, the RR database has the frequency listed as:

"National Interagency Fire Center - USA - National Incident Radio Support Cache - Ground Ops - Logistics - Logistics7"

Does anyone know what and where this is?

 

[kayn1n32008]

All....I am in Greenville SC. I am hearing an amateur DMR repeater on 408.500, which is outside the 70cm amateur band. It is connected to and repeating TG 3100, which I confirmed via my DMR hotspot. However, the RR database has the frequency listed as:

"National Interagency Fire Center - USA - National Incident Radio Support Cache - Ground Ops - Logistics - Logistics7"

Does anyone know what and where this is?

Add the IF frequency of your scanner to 408.500MHz

 

[CCHLLM]

Check the Fed and TVA databases for NC/SC/TN/GA in the RR databases. You are not far from several of the mountaintop Fed sites where the borders of these states come together, and the USFS/TVA, etc., utilize the low 400 end of UHF for links, etc. That still doesn't 'splain why you're hearing ham traffic on a fed freq.

 

[jgiercyk]

Any recordings you can share? I'll try to monitor today and see what I can grab.

I'll work on that. I'm still trying to figure out this thing. (SDS200)

 

[jgiercyk]

First, are you sure it is Not an image ? or Intermod ?
What Make/Model scanner are you hearing this one ??

Take a second radio and search 144-148 and 440-450 and see if you find a Repeater active with the same traffic
Lets rule out first.

I'm using an SDS200 with the DMR upgrade. I'm relatively certain it's not an image. My DMR radio is a handheld. I can try a search with an external antenna, but the Anytone rigs are somewhat difficult to program. I'll have to go a little homework.

 

[jgiercyk]

Add the IF frequency of your scanner to 408.500MHz

I hadn't thought of that....good idea.

 

[kayn1n32008]

If you are hearing ham comms on a 408MHz frequency, it is almost 100% an image.

 

[jgiercyk]

MYSTERY SOLVED.....pilot error.

My DMR Openspot2 retransmits signals on 438.500, exactly 30Mhz above the signal I am receiving. I do not know what the IFs are in the SDS200, but I suspect that one of them is 30Mhz. I shut down the hotspot and the signal on 408.500 went away. It's either the proximity of the hotspot to the antenna or to the scanner. Thanks to @kayn1n32008 for kicking me in the right direction!

 

[ecps92]

So, then it was an IMAGE, mystery solved.

MYSTERY SOLVED.....pilot error.

My DMR Openspot2 retransmits signals on 438.500, exactly 30Mhz above the signal I am receiving. I do not know what the IFs are in the SDS200, but I suspect that one of them is 30Mhz. I shut down the hotspot and the signal on 408.500 went away. It's either the proximity of the hotspot to the antenna or to the scanner. Thanks to @kayn1n32008 for kicking me in the right direction!