Motorola Control Channel UK

[Neutrino222]

I've found what I believe to be a motorola control channel, but how do I add this into the EZ trunked radio setting for monitoring?

 

[TAbirdman]

Is this a new system or a new frequency for a system you already have programmed?

 

[Neutrino222]

Is this a new system or a new frequency for a system you already have programmed?

I stumbled onto what I believe to be a trunked control channel, but now I'm having doubts because it seems to be operating in the AM band unless it is somehow being reflected from another part of the radio spectrum. I went through the various control channel sounds, and it fits quite well with a motorola protocol.

To answer your question, it is a new frequency, possibly a control channel. How do I work with this?

 

[ecps92]

What is the frequency and the make/mode of the device that received it ?

I stumbled onto what I believe to be a trunked control channel, but now I'm having doubts because it seems to be operating in the AM band unless it is somehow being reflected from another part of the radio spectrum. I went through the various control channel sounds, and it fits quite well with a motorola protocol.

To answer your question, it is a new frequency, possibly a control channel. How do I work with this?

 

[racingfan360]

A think this is a bit confused.....
- Do you mean a DMR Trunked control chanel or something else?
- I'm not sure what you mean by the AM band: the AM broadcast band, 0.5 to 1.7MHz (unlikely given the coverage of the TRX1) or the Airband 108-138Mhz? Regardless, you wont find a genuine Moto Trunked channel in either.
- The TRX1 doesnt trunk track any of the DMR systems. So adding a control channel wont do anything, unless the slot switches to voice in which it will decode the voice.

 

[a417]

I stumbled onto what I believe to be a trunked control channel, but now I'm having doubts because it seems to be operating in the AM band ...

To answer your question, it is a new frequency, possibly a control channel. How do I work with this?

What is the frequency and the make/mode of the device that received it ?

...and where are you?
do you have a recording?
what did you compare it against?

 

[Neutrino222]

...and where are you?
do you have a recording?
what did you compare it against?

I'm in the UK and the frequency is at 393.2625 Mhz AM which sounds like this which I gathered from this data list under the Trunked Radio Systems heading.

 

[ecps92]

what make/model scanner ?

It does sound like trunking, I would try and switch your mode from AM to FM
Here in the US - that freq range 380-400 is used for Military LMR [Land Mobile Radio]
on both Bases as well as Floating Bases [Ships] - conventional and trunk,

Happy hunting

I'm in the UK and the frequency is at 393.2625 Mhz AM which sounds like this which I gathered from this data list under the Trunked Radio Systems heading.

 

[Neutrino222]

what make/model scanner ?

It does sound like trunking, I would try and switch your mode from AM to FM
Here in the US - that freq range 380-400 is used for Military LMR [Land Mobile Radio]
on both Bases as well as Floating Bases [Ships] - conventional and trunk,

Happy hunting

Cheers. The thing about the TRX-1, there doesn't seem to be a way to change the mode. All steps and modes are hard set so to speak. It would be nice to have that flexibility, and it is beyond me why such functionality wasn't included.

 

[cmjonesinc]

Don't have a trx1 in front of me but I believe after the frequency is stored as an 'object' you can select 'browse objects' from the main menu, browse to that object and press 'menu'. After that you should be able to go to 'rx mode' and change it from am to fm, nfm or auto.

 

[Neutrino222]

Don't have a trx1 in front of me but I believe after the frequency is stored as an 'object' you can select 'browse objects' from the main menu, browse to that object and press 'menu'. After that you should be able to go to 'rx mode' and change it from am to fm, nfm or auto.

Oh, I see. I did do this and the signal has sharpened up on narrow band. How could I then use this control channel?

 

[TAbirdman]

Don't have a trx1 in front of me but I believe after the frequency is stored as an 'object' you can select 'browse objects' from the main menu, browse to that object and press 'menu'. After that you should be able to go to 'rx mode' and change it from am to fm, nfm or auto.

I would also try and set that object to DMR, test it. If no results, then go back and try NXDN, no luck, go back and try P25.

 

[fires999]

Evening,
Im also in uk , whereabouts are you ? I believe this may be TETRA allocation , so potentially the Blue Light Services however the noise you hear is about all you will get (there are some users who use TETRA in the clear)..emergency services are all encrypted.
Kev (East of England)

 

[Neutrino222]

Evening,
Im also in uk , whereabouts are you ? I believe this may be TETRA allocation , so potentially the Blue Light Services however the noise you hear is about all you will get (there are some users who use TETRA in the clear)..emergency services are all encrypted.
Kev (East of England)

I'm not all that far from you. I'm around the Clacton area, but I have my beam antenna pointing towards Colchester. It could possibly be a Tetra signal.

 

[Neutrino222]

I would also try and set that object to DMR, test it. If no results, then go back and try NXDN, no luck, go back and try P25.

I don't seem to have an option for P25. DMR and NXDN, yes, but not P25. Neither DMR nor NXDN produce anything.

 

[racingfan360]

Thanks for the added info Neutrino222. However you really shouldn't get anything other than Airwave TETRA or Military Airband comms at 393.2625 MHz.
Does it actually sound like TETRA which I think is the most likely option: Terrestrial Trunked Radio (TETRA) - Signal Identification Wiki ?
Another possibility is Paknet (albeit it's being phased out, and you'd need to be very close to the tranmitter if you're still gettig images in the 393Mhz range): trunk unknown.wav
Sharing a recording of the audio might help be more definite....

 

[Neutrino222]

Thanks for the added info Neutrino222. However you really shouldn't get anything other than Airwave TETRA or Military Airband comms at 393.2625 MHz.
Does it actually sound like TETRA which I think is the most likely option: Terrestrial Trunked Radio (TETRA) - Signal Identification Wiki ?
Another possibility is Paknet (albeit it's being phased out, and you'd need to be very close to the tranmitter if you're still gettig images in the 393Mhz range): trunk unknown.wav
Sharing a recording of the audio might help be more definite....

Thanks, racingfan.

I'm pretty sure it's not tetra. I'll find a way to upload an audio clip. That would be easier for everyone. It does sound similar to the Paknet wav you shared and the signal is maxed out.

 

[racingfan360]

Thanks. Have a search round 163 and 164 MHz for [Vodafone] Paknet. They blast out at high power, just like 153Mhz pager signals, and therefore you can get images all over the place. Paknet is encrypted so even if you could decode the format you wouldn't be able to decode the data/content.

 

[Thunderknight]

Any chance you could be picking up a ship off shore?

 

[fires999]

Neutrino 222,
Morning , is it just that single spot frequency ? I'm back on duty at the weekend on Base and have access to a wideband antenna at height so will have a listen.
The only thing I've heard in that area is TETRA but happy to have a search around - obviously it's close to Military Airband which for me is a slight issue as it clashes with my work !!!
Will keep you posted...make a change not listening to Mil Air or P25
Thanks,
Kev