Re: [digitalradio] Re: Sub Channel DQPSK

2007-10-29 Thread Jose A. Amador
Well, I do not have a distinct characterization of Olivia submodes. 8/500 seems to be fair enough, not too greedy on bandwidth and works where other modes (not Olivia) fail. I have used the most common available on MultiPSK, that is, 8/250, 8/500, and 16/500. Ocassionally, 32/1000, or even

[digitalradio] Re: Sub Channel DQPSK

2007-10-27 Thread Vojtech Bubnik
Would the phase distortion that can corrupt a PSK signal occur the same on a M-PSK signal? Phase and frequency modulation are two sides of the same coin. There is a baseband transformation to translate from phase to frequency modulation and vice versa - integration / derivation. Integrate

Re: [digitalradio] Re: Sub Channel DQPSK

2007-10-27 Thread Jose Amador
Vojtech Bubnik escribió: PSK as well as MFSK will be affected by multipath, it will create another type of inter symbol interference - time overlap. DominoEX with its incremental MFSK tries to cope with it, but there is a price for that. I am not convinced yet that the incremental MFSK is

Re: [digitalradio] Re: Sub Channel DQPSK

2007-10-27 Thread Rick
Have you found particular combinations of Olivia BW and tones that seem to work the best for various conditions? My frustration with Olivia is that it is impractically slow for keyboard chats unless you use the higher baud speeds to get the wpm to at least 30 wpm. But then it does not seem to