Project Status - Phase II

  1. *January 24, 2010: Major change of direction with our hardware. The lack of off-the-shelf suitable IC’s (4FSK data pumps) lead us to explore the SDR (Software Defined Radio) route. After a weeks or so with our newly purchased USRP and GNURadio, We successfully managed to decode MOTOTRBO TDMA bursts. our new TI DSP dev kit arrived last week and we are experimenting with it. The bad part - Further delays in achieving our estimated deadline and the use of an IF input (10.7MHz)..... the good: a more powerful DSP, completely software defined, and the capability to implement P25, NXDN, IDAS and other modulation methods completely in software ! 


We were busy today talking to one of our suppliers trying to explain them what we are trying to do and that some of their available parts are capable of outputting raw data. I am pretty certain we’ll have another major breakthru tomorrow if our suppliers will cooperate and show some holiday spirit !

Despite the minor set-back with this one particular IC (4FSK modem) We did manage to consistently and correctly decode the last half of the first burst. with some software magic we managed to extrapolate and demodulate larger chunks of the superframe (if not the entire superframe) so we do have a plan B in case our supplier does not deliver.... Stay tuned !

  1. *December 15, 2009: Today was a very good day for science !

Our latest piece of test equipment, an Agilent E4406A 4GHz Analyzer has arrived late this afternoon and was immediately put in good use analyzing the 4FSK bursts of our XPR6500:

  1. *February 25, 2010: As of today we are joining Motorola’s approved developer program. We feel we could do a much better job creating applications for commercial and amateur use this way.

This means that from this moment, our MOTOTRBO decoding project is no longer in the public domain. We will not share any technical information proprietary to Motorola without a written approval from Motorola. However, We do anticipate many different technical solutions to evolve out of this endeavor, and eventually many of those will find a good use within the amateur radio community as well.

In the last few months, We have been using Mototrbo radios in a local repeater here in Boca Raton, Florida, and joined TRBO-6, a network of linked amateur radio MOTOTRBO repeaters over IPSC. We grew to love the system, and our interests progressed from simple decoding to creating applications and software / hardware solutions. While MOTOTRBO is a commercial system (Unlike DSTAR, IRLP and ECHOLINK) I believe it has some very interesting appeal to amateur radio, and with time as applications become readily available and affordable to amateurs, would spread to ham use similarly to the way APCO25 (P25) found it’s way to ARES/RACES emergency ham operations.

I hope you understand and support our decision. I thank everyone who expressed interest in this project and hope I could contribute and find use for some of the commercial applications in ham radio.  

--Regards, Moni / KC2KRW