SDR# Is there a way to simulate a trunking system with an SDR or PC?

[dmason04]

Howdy,
I was reading and read about a piece of hardware that can simulate a trunking system but was curious if there is a sort of software or SDR program that can simulate a trunked system.

Thanks,
David

 

[Reconrider]

Are you asking if you can "fake/broadcast" a trunk system by using an SDR?

Short answer, no
Long answer, no

 

[jtwalker]

Ok I’ll bite … why?

 

[AM909]

@Reconrider: Why no? With SDR transciever(s), I imagine you could write something to simulate a trunking system (as a test instrument, for example). Obviously you need to know what you're doing, but it seems possible.

 

[lwvmobile]

I don't see why not. In the end, its just a repetitive string of data being broadcast over a radio frequency. That may be a bit of an oversimplification, but if you remove the TX aspect of it and just focus on the pure data or symbols, it would probably become pretty trivial to simulate a trunking protocol.

I've done a lot of work on this project on and off over the last year or so, and I was just pondering the other day that I might could do something similar to what your asking. I have a pretty solid grasp on how EDACS systems work now, and if I had time I could possibly make a crude or rudimentary simulation of a control channel using C or Python, and something like GNURADIO to make a sound signal with the output data stream. It certainly wouldn't be full featured, but given time and desire, I could probably make it pump out basic things like a system id, simulated calls with AFS or group and sender info, and peers and patches.

GitHub - lwvmobile/edacs-fm: EDACS trunk tracking using RTL2832. rtl_fm, sdr++, gqrx, or gnuradio.

EDACS trunk tracking using RTL2832. rtl_fm, sdr++, gqrx, or gnuradio. - GitHub - lwvmobile/edacs-fm: EDACS trunk tracking using RTL2832. rtl_fm, sdr++, gqrx, or gnuradio.

github.com

 

[dlwtrunked]

Howdy,
I was reading and read about a piece of hardware that can simulate a trunking system but was curious if there is a sort of software or SDR program that can simulate a trunked system.

Thanks,
David

The problem her is you do not define "simulate". Do you mean control channel data? Do you mean control channel radio signal? Do you mean control channel radio signal along with traffic channel radio signal? Knowing what you want to do might answer this.

 

[slicerwizard]

Howdy,
I was reading and read about a piece of hardware that can simulate a trunking system but was curious if there is a sort of software or SDR program that can simulate a trunked system.

The software might exist or maybe not, but certainly could be created. As noted, you haven't clarified what constitutes a simulation.

 

[mikewazowski]

There’s a project over at communications.support which is attempting to do this.

 

[slicerwizard]

There’s a project over at communications.support which is attempting to do this.

For what protocol(s)?

 

[buddrousa]

Morning Mike just a thought would this not infringe on Motorola's Patent?

 

[mikewazowski]

For what protocol(s)?

P25 Trunking

Morning Mike just a thought would this not infringe on Motorola's Patent?

Don't know. I'm not a lawyer and I'm not sure what patents Motorola might have on P25 trunking.

 

[dmason04]

S

The problem her is you do not define "simulate". Do you mean control channel data? Do you mean control channel radio signal? Do you mean control channel radio signal along with traffic channel radio signal? Knowing what you want to do might answer this.

Sorry for not clarifying, I want to simulate a control channel with an SDR is possible or possibly with some sort of software.

 

[Thunderknight]

There are Service Monitors that do this.

ASTRONICS TEST SYSTEMS | Project 25

freedomcte.com

 

[dmason04]

There are Service Monitors that do this.

ASTRONICS TEST SYSTEMS | Project 25

freedomcte.com

I'm gonna guess that those monitors are a bit out of my budget... XD

 

[Thunderknight]

I'm gonna guess that those monitors are a bit out of my budget... XD

If you have to ask the price...
But seriously, I bet what you want to do could be done with GNU Radio.

 

[dmason04]

I've heard briefly of GNU but I'm not too familiar with it. How would I go about it?

 

[boatbod]

Simulate as in send a datastream of P25? I'm pretty sure Max's version of op25 can do that but I've never tried it personally.

 

[dmason04]

Simulate as in send a datastream of P25? I'm pretty sure Max's version of op25 can do that but I've never tried it personally.

I've been looking for OP25 but can't seem to find a place to download it. Do you know where I might find it?

 

[GTR8000]

I've been looking for OP25 but can't seem to find a place to download it. Do you know where I might find it?

It is literally the first result when searching Google for "OP25".

 

[a417]

I've heard briefly of GNU but I'm not too familiar with it. How would I go about it?

You have heard of GNU, or GNURadio?

You ever need a lawyer in a county, you google "(county) lawyer" ...right? First couple of things that pop up usually point you in the right direction.