June 2019 - AMSAT-BB - mailman.amsat.org

PSAT2 SSTV copied in Brazil
by Roland Zurmely 26 Jun '19

26 Jun '19

<https://www.qsl.net/py4zbz/psat2.htm>

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PSAT2 SSTV copied in Brazil
by Roland Zurmely 26 Jun '19

26 Jun '19

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Re: [amsat-bb] PSAT2 PSK31 Uplink CORRECTION!
by Robert Bruninga 26 Jun '19

26 Jun '19

Argh! The Team at Brno University that built the PSK31 transponder CORRECTS me. The uplink is 29.4815 MHz. Bob -----Original Message----- From: Robert Bruninga <bruninga(a)usna.edu> Sent: Wednesday, June 26, 2019 11:23 AM To: 'amsat bb' <amsat-bb(a)amsat.org> Cc: 'Scott' <scott23192(a)gmail.com> Subject: RE: [amsat-bb] PSAT2 PSK31 Operations Enabled PSAT2 Ten meter PSK31 uplink and UHF FM 435.350 downlink is ON. Who will be the first to nail down the ten-meter PSK31 center uplink frequency? It should be around 29.40X. The Total Doppler shift during a pass should be about 1 KHz. What 29.40X TX uplink gives 1.5 KHz in the UHF passband at the center of the pass? Thanks, Ill correct links below. (PSAT has uplink on 28.120. But PSAT2 is on 29.40X) Bob -----Original Message----- From: AMSAT-BB <amsat-bb-bounces(a)amsat.org> On Behalf Of Scott via AMSAT-BB Subject: Re: [amsat-bb] PSAT2 Future Operations Regarding the PSK31 uplink, please advise the correct RF frequency. At http://aprs.org/PSAT2/USER-Operations-Manual.doc, the uplink frequency is listed as 29.401 MHz. At https://github.com/alpov/PSAT-2/blob/master/README.md, the uplink frequency is listed as 29.48 MHz. At http://aprs.org/psat2.html, the uplink frequency is listed as 28.120 MHz (in text, w/ a graphic indicating "29.XX?"). Thanks! -Scott, K4KDR ============================ On Wed, Jun 26, 2019 at 10:20 AM Tomáš Urbanec via AMSAT-BB < amsat-bb(a)amsat.org> wrote: > Hi Paul, > > Thanks for the interest in the PSK31 transponder, as Bob already > pointed up, the downlink audio spectrum is shared, so at 280Hz and > 374Hz are > PSK31 beacon tlm streams from camera board and transponder board > respectively. Then every 4 minutes the SSTV signal is present so if > you plan experiments in PSK transponder, try to stay between the > beacons and SSTV. Description of modes you can find at > https://github.com/alpov/PSAT-2/blob/master/README.md > > We would be glad to answer any questions about this experiments. > > We are still awaiting for any positive confirmation of downlink signal > at 435.350MHz as for us it is still below horizon. Any audio > recordings, IQ data or at least pictures of reception would be welcomed. > > 73! Tomas OK2PNQ and Ales OK2ALP > _______________________________________________ Sent via AMSAT-BB(a)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: https://www.amsat.org/mailman/listinfo/amsat-bb

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Re: [amsat-bb] PSAT2 PSK31 Operations Enabled
by Robert Bruninga 26 Jun '19

26 Jun '19

PSAT2 Ten meter PSK31 uplink and UHF FM 435.350 downlink is ON. Who will be the first to nail down the ten-meter PSK31 center uplink frequency? It should be around 29.40X. The Total Doppler shift during a pass should be about 1 KHz. What 29.40X TX uplink gives 1.5 KHz in the UHF passband at the center of the pass? Thanks, Ill correct links below. (PSAT has uplink on 28.120. But PSAT2 is on 29.40X) Bob -----Original Message----- From: AMSAT-BB <amsat-bb-bounces(a)amsat.org> On Behalf Of Scott via AMSAT-BB Subject: Re: [amsat-bb] PSAT2 Future Operations Regarding the PSK31 uplink, please advise the correct RF frequency. At http://aprs.org/PSAT2/USER-Operations-Manual.doc, the uplink frequency is listed as 29.401 MHz. At https://github.com/alpov/PSAT-2/blob/master/README.md, the uplink frequency is listed as 29.48 MHz. At http://aprs.org/psat2.html, the uplink frequency is listed as 28.120 MHz (in text, w/ a graphic indicating "29.XX?"). Thanks! -Scott, K4KDR ============================ On Wed, Jun 26, 2019 at 10:20 AM Tomáš Urbanec via AMSAT-BB < amsat-bb(a)amsat.org> wrote: > Hi Paul, > > Thanks for the interest in the PSK31 transponder, as Bob already > pointed up, the downlink audio spectrum is shared, so at 280Hz and > 374Hz are > PSK31 beacon tlm streams from camera board and transponder board > respectively. Then every 4 minutes the SSTV signal is present so if > you plan experiments in PSK transponder, try to stay between the > beacons and SSTV. Description of modes you can find at > https://github.com/alpov/PSAT-2/blob/master/README.md > > We would be glad to answer any questions about this experiments. > > We are still awaiting for any positive confirmation of downlink signal > at 435.350MHz as for us it is still below horizon. Any audio > recordings, IQ data or at least pictures of reception would be welcomed. > > 73! Tomas OK2PNQ and Ales OK2ALP > _______________________________________________ Sent via AMSAT-BB(a)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: https://www.amsat.org/mailman/listinfo/amsat-bb

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PSAT2 Future Operations
by Robert Bruninga 26 Jun '19

26 Jun '19

PSAT Voltages look good. The PSK31/SSTV downlink appear to be working well on 435.350+/- Doppler, But you will only see SSTV during daylight passes (Now occuring in the Southern Hemisphere) where the Solar charge voltage is above threshold (6.8 volts. THen you should see SSTV images once every 4 minutes automatically while in the sun. Northern Hemisphere passes are presently occurring overnight and PSAT2 is in a 28 degree orbit and not seen at all by high northern latitudes and most of Europe :-( PSAT2 APRS digipeating will remain off indefinately while all these other NEW modes are working. Do not TX any APRS packets on the uplink. DTMF Grid Uplinks-to-APRS/Voice will be enabled LATER. While waiting, spend the next day familiarizing yourself with the PSAT2 APRStt touchtone mode. This mode will let you send DTMF Grid square reports which are translated to VOICE and to an APRS packet on the 145.825 downlink. Be sure to prepare your radio with your pre-programmed DTMF grid report IN ADVANCE. And learn how to send Touchtone from your radio's DTMF memory. quickly! It should take under 4 seconds. Do not even think of sending it manually. Here is WA7MXZ's translator to calculate your onetime DTMF grid report: http://aprs.org/aprs_translator.htm See how it works in about the middle of the PSAT2 page: http://aprs.org/psat2.html A successful DTMF uplink will result in a Voice response and an APRS packet on the downlink for display on APRS radios. Again, no APRS Uplink in this mode. This will be painful because of the 4 second uplink transmissions all colliding on the half-duplex uplink, so PLEASE only attempt your DTMF uplink once every 30 seconds or longer to give others a chance. And of course NOT while PSAT2 is downlinking. We will advise when this mode is enabled. http://aprs.org/aprstt.html Bob, WB4APR

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Re: [amsat-bb] PSAT2 Future Operations
by Roy Dean 26 Jun '19

26 Jun '19

There are a few successful UHF observations at SatNogs. I tried to decode the SSTV signal, but it was a little bit off frequency, so only got some somewhat organized "noise" in the picture. General link for PSAT2 observations (will show up-to-date observations): https://network.satnogs.org/observations/?future=0&bad=0&failed=0&norad=999… Some good UHF observations so far: https://network.satnogs.org/observations/772700/ https://network.satnogs.org/observations/772668/ https://network.satnogs.org/observations/772662/ https://network.satnogs.org/observations/772680/ https://network.satnogs.org/observations/772697/ https://network.satnogs.org/observations/772670/ https://network.satnogs.org/observations/772701/ https://network.satnogs.org/observations/772661/ https://network.satnogs.org/observations/772673/ --Roy K3RLD > We are still awaiting for any positive confirmation of downlink signal > at 435.350MHz as for us it is still below horizon. Any audio recordings, > IQ data or at least pictures of reception would be welcomed.

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AMSAT's Upcoming Satellite Operations
by Robert Bankston 26 Jun '19

26 Jun '19

There is a lot of great activations happening this Summer. Be sure to keep an eye on AMSAT's Upcoming Satellite Operations webpage for all of the latest announcements. https://www.amsat.org/satellite-info/upcoming-satellite-operations/ In addition AMSAT's call sign, W3ZM, is popping up all over the U.S. in an effort to operate from all 50 States before this year's 50th Anniversary Symposium. To make this happen, we need your help. Check out https://www.amsat.org/events/was-w3zm/ for more information available. 73, Robert Bankston, KE4AL AMSAT-NA VP of User Services

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TLE's for PSAT2
by cchunter3＠mindspring.com 26 Jun '19

26 Jun '19

Using your LATEST TLEs for last night: 6/26/19 0443 UTC pass COPIED only ONE BEACON at 5 deg. Fm PSAT2-1 To APOFF Via ARISS <UI pid=F0 Len=34 >[21:46:54] T#286,693,062,878,885,162,01000001 0624 UTC pass, copied 5; the first one was at 3 deg. Fm PSAT2-1 To APOFF Via ARISS <UI pid=F0 Len=34 >[23:25:23] T#383,691,061,897,898,162,01000001 Fm PSAT2-1 To APOFF Via ARISS <UI pid=F0 Len=20 >[23:26:09] >145.980MHz No Digi. Fm PSAT2-1 To APOFF Via ARISS <UI pid=F0 Len=34 >[23:26:24] T#384,688,097,904,903,162,01000001 Fm PSAT2-1 To APOFF Via ARISS <UI pid=F0 Len=34 >[23:27:24] T#385,689,063,908,907,162,01000001 Fm PSAT2-1 To APOFF Via ARISS <UI pid=F0 Len=16 >[23:28:48] >S#000964,0q801 no joy on BRICSAT-2...if its on the same orbit? 73 Christy KB6LTY DM14 --------- xcellent match so far with these elements: PSAT2 1 44348U 19036K 19176.47956735 .00000352 00000-0 00000+0 0 9991 2 44348 28.5449 199.6259 0392489 107.1682 11.6450 14.96305882 23 Northern Hemisphere passes begin at about 9:35 PM LOCAL time Then again at around 11:15 PM and then about 01:00 AM local time ish.... What is amazing, is that it looks like it is about the SAME time every day for a pass even though the orbit is moving earlier After a few days, there will be a new orbit around 8 PM local time, and the others above will continue at the same time. And so forth. So it is moving earlier but appears to have this sun synchronous behavior... Bob

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PSAT2 over India
by Nitin Muttin 26 Jun '19

26 Jun '19

Hi Bob, Congratulations !! on the successful launch of the satellite. I heard strong signals during the 12:30 UTC pass on June 26th over India. Will turn ON the satgate tommorow. 73 Nitin [VU3TYG]

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PSAT-2 Telemetry
by Nicholas Mahr KE8AKW 26 Jun '19

26 Jun '19

Hi Bob, Heard PSAT-2 on a 7 degree pass. Unfortunately the highest passes are only about 7-8 degrees in elevation right now. However managed to snag this at 6/26/2019 at 04:55 and 04:56UTC. I will be listening for BRICSAT-2 next on 437.600 however chances of decoding it will be low due to the low elevation and the nature of 9600 baud. 1:Fm PSAT2-1 To APOFF Via ARISS <UI R Pid=F0 Len=34> [00:54:59R] [+++] T#294,685,074,921,925,162,01000001 1:Fm PSAT2-1 To APOFF Via ARISS <UI R Pid=F0 Len=34> [00:56:00R] [-++] T#295,684,061,924,927,162,01000001 73 Nick KE8AKW

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