Trunked DMR received in another band

[na5rc]

I captured this in a DSD+ log. It is clearly a trunked system but it is coming in on 443.75 in the amateur band where trunking is not allowed. It must be a spur or harmonic. Trying to identify the system type and the source.

 

[mmckenna]

Trunking is allowed on the amateur radio bands, just not very common.

 

[fwradio]

Are you sure it's trunked and not just a single DMR repeater? If it were trunked it would be spewing out data constantly, with and without voice frames.

 

[na5rc]

Are you sure it's trunked and not just a single DMR repeater? If it were trunked it would be spewing out data constantly, with and without voice frames.

If it was a single DMR repeater then I should be able to hear voice. I have a DMR repeater that I'm monitoring at the same time on the SDR and it handles the DMR voice just fine. From the log, it seems to indicate there are other channels involved. Because this is in the ham band and there would be no reason for trunking there, I believe it to be a spur or harmonic from a commercial DMR trunked network. Using resources here, I can not find a DMR trunked network near me.

 

[motorola_otaku]

There is an active DMR repeater on 443.75 down in Victoria. I'm not surprised that you'd hear it up in La Grange during a band opening.

I'm not super familiar with DSD+ but I'm also not surprised that you'd see unusual traffic since it's on Brandmeister and they allow different data modes that DMR-MARC does not.

 

[na5rc]

Thank you for this info. I see 443.75 in Port O'Connor but not Victoria so this may be the one you refer to (and perhaps it moved to Victoria. I will contact the trustee. I've not been able to decode voice on that signal with the same setup that I decode voice on my DMR repeater. But still, this is a very promising lead. If this is the source then my link radio on 443.75 and be put on a beam aimed away from that area and I can move to a better quality receiver.