WA Radio Scanner Users' Group

Hi all,

I've found some frequencies that I believe are a trunk at the airport, but I'm unable to work out how to access them.

The existing analogue trunk is .4875mhz so I've deleted those.. but the rest I'm unsure how to work out which are linked.

My scanner is a Uniden UBCT396TX.

http://web.acma.gov.au/pls/radcom/site_ ... ID=9000011

Frequency
456.40000
456.90000
466.40000
466.90000

820.46250
820.48750
821.46250
821.48750
822.46250
822.48750
823.46250
823.48750
824.46250
824.48750



865.46250
866.46250
867.46250
868.46250
869.46250

I can't seem to pick up any control channels on any of those frequencies?!?! Maybe someone who lives close to the airport could shed some light. I'm pretty sure the 400MHz frequencies wouldn't be trunked

Have a look here: http://spench.net/rf/ Around the airport area, things like ground ops freqs and so on. Be warned though - Ground ops freqs for airlines tend to use callsigns and codewords (for obvious reasons), so don't expect to be able to tune in and know exactly what's going on.

Nafenn wrote:Have a look here: http://spench.net/rf/ Around the airport area, things like ground ops freqs and so on. Be warned though - Ground ops freqs for airlines tend to use callsigns and codewords (for obvious reasons), so don't expect to be able to tune in and know exactly what's going on.

The link doesn't seem to work for me

Link is working for me, however the RFMap is down.

numloxx wrote: 456.40000
456.90000
466.40000
466.90000

820.46250
820.48750
821.46250
821.48750
822.46250
822.48750
823.46250
823.48750
824.46250
824.48750

865.46250
866.46250
867.46250
868.46250
869.46250

Well, you can ignore all the 82x.xxxxx frequencies, as they are Repeater Rx frequencies, with the Repeater Tx frequencies 45 MHz above.

Likewise, the 456.xxxxx frequencies are the Repeater input frequencies, and so are of little use to scanner users.

--
Comint

Thanks Comint.

numloxx wrote: 865.46250
866.46250
867.46250
868.46250
869.46250

There have been some posts on these Forums about TETRA in use at the Airport, and as these frequencies are licensed to Comsource International Pty Ltd, a major supplier of TETRA systems in Western Australia, they are probably now been used for TETRA.

Unfortunately, the Squelch circuit of most scanners does not respond to TETRA signals, so you would have to check each frequency with 'open squelch', to determine if the signal can be 'heard' at your location.

There is currently no scanner available that will decode TETRA signals.

--
Comint

Comint wrote: There is currently no scanner available that will decode TETRA signals.

AFAIK encryption is routinely used on TETRA networks, anyway.

Will there ever be a TETRA compatible scanner?? I know for a fact that TETRA is encrypted by default and it is illegal to intercept encrypted transmissions.

Fitzyyy wrote:Will there ever be a TETRA compatible scanner?? I know for a fact that TETRA is encrypted by default and it is illegal to intercept encrypted transmissions.

First up it is not illegal to monitor encrypted transmissions in Australia, the USA yes, but here no.

And no there will not be a TETRA scanner in the forseeable future, TETRA uses end to end encryption and in this country, two levels of authentication. That alone makes the chances slim, and while TETRA is an open protocol, it is highly unlikely that a licence would be granted to a scanner manufacturer to build a scanner that could beat what is a major selling point of the system, transmission security.

R

numloxx wrote:Link is working for me, however the RFMap is down.

Sorry about that! I've been upgrading various machines on the network, so there have been a couple of short outages.

If you wish to learn a little more about the technical details behind TETRA, have a look at: http://wiki.spench.net/wiki/TETRA

Let me know if there's someting else I should add there!