Rick, Yes I had trouble printing 100% of what Mac WN3C was transmitting during the inital 8/500 contact, we did go to 16/500 and the print came back to 90%.
After discussing the settings with Mac it became apparent that there was several issues that was causing problems on Mac's end. The amount of drive, the DSP settings, et. What I forgot to mention to him was turn off the audio processing, occasionally I have left it on and have had troubles. I have operated Olivia for almost two years, on 80-40-30 and 20 meters and I can honestly say most QSO's are 100% copy regardless of the bit and width settings. I have worked stations running less than one watt on both 40 and 80 meters as an experiment and received 100% copy on both ends. I think that the biggest problem with the new rigs and digital soundcard software is, how to setup the rig as you have concluded and so stated. People are still looking for some ALC when they should adjust none, no processing at all and at reduce power. The other problem is there choice of operating tones with respect to the passband of the transmitter. One should look at the waterfall display for the mode there using (USB) and use the center of the passband where there is little chance of clipping when transmitting. The software writers have made digital easy to use, now its our turn as operators to understand what mode, what width and at what power level can provide the best communications for the given conditions. It was a new learning experience for me and I have just scratched the surface. Its fun and thats another reason I have been a HAM since 1957. Heck if you hear us on again please jump in and say hello, we need more round tables and activity on 30 meters. 73 Ron W4LDE KV9U wrote: >As Doug Smith has pointed out, the group delay issue on amateur gear can >be challenging, even with training. The ionosphere is very unforgiving. >Any tests you can do would be great. Have you considered discussing this >with the Digital Voice Working Group at ARRL? They have gone through >quite a bit of review on this and have also criticqued several different >digital voice protocols, some of which can be used for either voice or >data. > >You are probably already aware that ARRL publishes committee reports >under the announcements part of the arrl web site. Then you can look for >updates by year on the Technology Task Force or working group reports >HSMM, Digital Voice, SDR, etc. > >I was listening to W4LDE and WN3C on Olivia just now. In fact they were >just signing off when I started writing this message and are wondering >if anyone has had problems with using Olivia with the faster baud rates >on 30 meters as they were experiencing a few minutes ago when they were >using the 8-500 mode. I was copying both stations fairly well until >signals got weaker on one of them. They switched to 16-500 with a >significant improvement for them and for me to copy them as well. >However, Olivia is under 20 wpm in that mode and is excruciating slow >from my perspective. > >73, > >Rick, KV9U > > > > >Mark Miller wrote: > > > >>Rick, >> >>Yes group delay is an issue, but with adaptive training this too can be >>overcome. Sound cards, or external modems using DSP or preferably FPGA's >>would be a fine compliment to most amateur gear. The SDR (software defined >>radio) that Jose mentioned will be the best solution going forward for more >>exotic modems. These modems would be an integral part of the radio. >> >>I was looking for a good way to test group delay, and was thinking of >>generating an FM signal with 3 to 5 KHz deviation and looking for an >>envelope at the output of the receiver. Does that sound ok? The signal >>generator is an HP 5640B. >> >>73, >> >>Mark N5RFX >> >> >> >> >> >>>Another thing that I came across in my web searching was that amateur >>>equipment generally has group delays that make it difficult to even >>>employ some of the modems we have been discussing. >>> >>> >>> >>> >> >>Need a Digital mode QSO? Connect to Telnet://cluster.dynalias.org >> >>Other areas of interest: >> >>The MixW Reflector : http://groups.yahoo.com/group/themixwgroup/ >>DigiPol: http://groups.yahoo.com/group/Digipol (band plan policy discussion) >> >> >>Yahoo! Groups Links >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> > > > >Need a Digital mode QSO? Connect to Telnet://cluster.dynalias.org > >Other areas of interest: > >The MixW Reflector : http://groups.yahoo.com/group/themixwgroup/ >DigiPol: http://groups.yahoo.com/group/Digipol (band plan policy discussion) > > >Yahoo! Groups Links > > > > > > > > > > > > Need a Digital mode QSO? 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