Tests on AO-27 showed that D-STAR fails if the frequency is more than 1.5 kHz off, that means there are times when you will not be able to access or hear the satellite using 5 kHz steps. The IC-9100 can be fine tuned and computer controlled, I'm not sure about any other D-STAR radios, maybe the IC-7100 can be too.
73,
Paul, N8HM
On Fri, Feb 2, 2018 at 10:57 AM, Sean Waite [email protected] wrote:
Well that certainly makes it a little easier. Are the doppler issues any different than the normal ones we face on a 70cm satellite?
The TLE on that Chinese sat suggests it'll get passes over the US, so that's good news if it's actually another FM bird. Having a handful of new satellites up there all at once will hopefully spread out the crowds so that we don't have people blasting them with 50W trying to beat out the other stations.
Sean WA1TE
On Fri, Feb 2, 2018 at 10:43 AM Paul Stoetzer [email protected] wrote:
It's a half-duplex parrot repeater, so there's no need to hear yourself. The trick is Doppler compensation.
I find it somewhat odd that they've managed to receive signals, but everyone else in Europe is reporting silence. We shall see.
Potential Keps from Space Track are:
1 43184U 18014E 18033.08269475 -.00000058 00000-0 00000+0 0 9993 2 43184 97.7305 303.2289 0012801 243.8166 116.1553 14.95704337 119
In other satellite news, one or maybe two Chinese amateur satellites was launched earlier this morning. FMN-1 carries an FM transponder with an uplink of 145.945 MHz and a downlink of 435.350 MHz. Telemetry downlink is 9k6 BPSK on 435.350 MHz. It's possible that one of the other CubeSats on the mission, Shaonian XIng, is one of the Juvenile series satellites coordinated here: http://www.amsatuk.me.uk/iaru/finished_detail.php?serialnum=547
However, without any communication from the satellite owners to the amateur community, all we can do is speculate and listen to see what's heard.
One object has been cataloged by Space Track for that launch so far:
1 43192U 18015A 18033.45158700 -.00000069 00000-0 00000+0 0 9994 2 43192 97.3413 165.3763 0014311 275.0882 167.9240 15.22360621 19
73,
Paul, N8HM
On Fri, Feb 2, 2018 at 10:37 AM, Sean Waite [email protected] wrote:
Looks like the group behind the burned up D-Star ONE project somehow managed to get a second satellite built and launched in a little over a month. They're getting data from it, and are awaiting the TLE. Pretty crazy how fast they got that up there.
I don't have a second D-Star radio, but maybe it'll be workable without being able to hear myself.
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