SatPC32 users:
This should get you started:
PSAT,435350.0,28120.0,FM,USB,NOR,0,0,PSK31
If the TX update step is greater than 1 Hz, go to the CAT tab. Select and store 1 Hz for the SSB/ CW interval. Check 10 X for the update speed. I have my usual 10 Hz selected, and a fast machine, so I get 1 Hz steps without changing anything.
The downlink should be fine, but the uplink will probably require a bit of adjustment to match your rig.
73s,
Alan WA4SCA
<-----Original Message----- <From: AMSAT-BB [mailto:amsat-bb-bounces@amsat.org] On Behalf Of Robert Bruninga <Sent: Friday, May 22, 2015 10:51 AM <To: amsat-bb@amsat.org <Subject: Re: [amsat-bb] Receiving PSAT PSK31 FM downlink (Users Welcome) < <The Brno University builders of the PSK31 transponder on PSAT have now <authorized user uplinks on 28.120 MHz PSK31 SSB. Downlink FM on 435.350 +/- <5 KHz doppler. Here is the announcement from Brno University: < <"We can uplink open to all users. Please, do it." - Mirek OK2AQ < <Do NOT operate if PSAT telemetry is below 7.20 volts. Cease operations. <The voltage parameter is the second data field. For example, this morning <the telemetry packet is showing 8.99 volts in the second data field: <T#658,899,072,583,875,854,00011100. The third field is current (here <showing 72 mA so Transponder is off. When PSK is on, then current goes to <over 300 mA) < <We'd like to get some packets in the DARK showing battery voltage while not <charging? < <Enjoy <Bob Bruninga, WB4APR < <-----Original Message----- <Sent: Thursday, May 21, 2015 7:20 PM <Subject: Receiving PSAT PSK31 FM downlink < <Receiving the PSAT (and BRICsat) 435.350 MHz FM downlink is as simple as <placing your PSK31 laptop microphone next to the speaker on your FM <satellite UHF receiver and just watching the waterfall. < <What you see is exactly what everyone else sees (its FM). There is no <Doppler added to the tones due to your station's position relative to the <satellite. But you DO have to retune your FM radio at least 3 times during <the pass (+5 KHz, 0, -5 KHz) to stay in the FM passband. < <User uplinks, however, will shift in the waterfall according to each user's <position relative to the satellite. The shift can be as low as 1 Hz per <second to as high as 6 Hz per second. This is because the uplink is on 10 <meters where the Doppler rate is only 1/15th of what it would be on UHF. < <The TELEMETRY channel at 315 Hz (PSAT) or 375 Hz (BRICsat) is FIXED with no <Doppler since it is generated onboard into the FM downlink < <WHAT TO DO: < <1) We will need PSK31 authors to open the PSK31 frequency tracking to <accommodate more than 1 Hz per second Doppler tracking. Current <implementations can do 1 Hz/s but completely fail at 3 Hz/s. 2 Hz/s might <work a little... < <2) Until then, ANY uplink user that is in line with a direct overhead pass <will have minimum Doppler at the start and end of his pass (1 Hz/sec) when <the satellite is going right at him and directly away from him. (Though it <will be MAX (6Hz/sec) when it passes over his station). < <3) Just turn on MULTI CHANNEL window and let the PSK31 decode everyone. <The ones with the least Doppler at any instant may be decoded for a while! < <USERS can transmit later when BRNO University says it has completed its <tests. Brno provided the transponders for use in the PSAT and BRICsat <satellites. < <So start preparing your station to TX PSK31 on 10 meters SSB and to receive <the audio from an FM UHF rig on 435.350 +/- 5 KHz steps of Doppler. < <DOWNLINK Limitations: The UHF downlink signal is only 300 mW and so a UHF <beam is needed on the downlink. < <UPLINK RESTRICTIONS: *NOTHING MORE THAN* a Vertical 1/4 wave or Dipole is <authorized on the 10m uplink and no more than 25 Watts (for now). <Remember a 1/4 wave vertical is the ideal antenna because it maximizes the <signal at lower angles and tapers the signal as the satellite gets closer. <This keeps user uplinks about the same during a pass. Strong stations just <drive down the AGC and ruin it for everyone. < <Use minimum power!! Remember, this is crossband FULL DUPLEX so you can see <yourself in the downlink just like everyone else can see you. Act <accordingly. And of course DO NOT TRANSMIT if you cannot see the waterfall <... Duh! < <Enjoy! < <Bob, WB4APR <_______________________________________________ <Sent via AMSAT-BB@amsat.org. AMSAT-NA makes this open forum available <to all interested persons worldwide without requiring membership. Opinions expressed <are solely those of the author, and do not reflect the official views of AMSAT-NA. <Not an AMSAT-NA member? Join now to support the amateur satellite program! <Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb