Hi Ib, Thanks for the information.
One thing I would like to add to the people that use HRD and a FT-847. I tryed many times to work SO-50 but I am unable to do this with HRD. When I want to make a QSO via SO-50 I allways have to use SatPC32. I haven't figured out why CTCSS and HRD isn't working with SO-50. 73 Jan PE0SAT On Sat, December 3, 2011 21:45, Ib Christoffersen wrote: > Working SO-50. > > I think it is time to look at how one can operate over SO-50 and the > problems that can be encountered. > > First the normal and nominal data: > > Uplink is at 145.850 MHz. Downlink at 436.795 MHz. > > If it is not ON - use 74.4 Hz CTCSS tone to activate the transmitter for > 10 > seconds to have it on for nominally 10 minutes - when on use 67 Hz CTCSS > tone during your transmission. > > That was the intended normal operation. > > Now to the deviations from the normal scheme. > > The downlink frequency sometimes jump approximately 5 kHz. Therefore I > have > two different frequencies pairs to be used in SATPC32: > > SO-50,436788.50,145849,FM,FM,NOR,0,0 > SO-50,436795,145850,FM,FM,NOR,0,0 > > If you do not use Full Doppler Tracking it is not much of an issue. Just > tune for best downlink. > > Talking about SATPC32 here are the entries for the CTCSS tone: > > SO-50,67.0,$3F,1 > SO-50,74.4,$3E,3 > > The first data is for the ICOM IC-910 radio. If you use another radio > please > look at the information in SATPC32. > > Next problem is the change of polarity of the downlink signal during a > pass. > The polarity changes during the pass. At least I have to switch polarity a > few times from RHCP to LHCP to optimize the downlink signal. That has been > confirmed by others. How it works using linearly polarized antennas I do > not > know - but I think there will be some fading. > > And if that is not enough - at least here over Europe - we have to put up > with QRM on the uplink from a lot of different sources like repeaters and > people using our frequencies as cheap phone connections. > The result of the QRM is that it sometimes is difficult to turn SO-50 on. > Also the QRM may turn the transmitter off. > > And since the inclination is not sun synchronous we have to live with a > steady change of pass times over the year. > > Some may think I am not a fan of SO-50. That is not the case. It is a very > good satellite we got for free and it works very well. > Already more people are using it over Europe after AO-51 is not with us > any > more. That just took a couple of days. > > 73 OZ1MY/Ib > -- With regards PE0SAT Internet web-page http://www.pe0sat.vgnet.nl/ _______________________________________________ Sent via [email protected]. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
