Andy,
On 20-08-13 17:29, Andy Wood wrote: (...) > All the Chinese manufacturers seem to be getting a bit excited about > it for some reason... > DMR/Mototurbo seems a much better bet than dPMR ;) The problem with DMR is that is TDMA multiplexing two signals in one 12.5 Khz channel. This means that you must switch on and switch off the transceiver at a x times / second rate so you need to have access to the baseband signal of the radio. Concidering the bandwidth of the radio, you need a SDR radio. (*) dPMR is FDMA in 6.25 Khz which you can implement with normal FM radios in 9k6 mode. My vote go to the technology that we hams can easily build with the equipement we now already have. :-) (*) The only exception is the repeater when servicing two channels at the same time, as it can broadcast continuesly at that time. BTW. TDMA implicates a maximum range (as TDMA has rather strict timing requirements, so also a maximum distance between the repeater and the radio). I do want to be able to do 10, 6 or 4 meter Es DX with my DV protocol. :-) > Andy. 73 kristoff - ON1ARF ------------------------------------------------------------------------------ Introducing Performance Central, a new site from SourceForge and AppDynamics. Performance Central is your source for news, insights, analysis and resources for efficient Application Performance Management. Visit us today! http://pubads.g.doubleclick.net/gampad/clk?id=48897511&iu=/4140/ostg.clktrk _______________________________________________ Freetel-codec2 mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/freetel-codec2
