May 2015 - AMSAT-BB - mailman.amsat.org

PSAT - BRICsat data?
by Robert Bruninga 27 May '15

27 May '15

PSAT – BRICsat: > Do you still want folks to send them in or are you getting want you want from the aprs.org site? We need people (who have time) to concentrate on capturing data from BRICsat on 437.975 9600 baud. PSAT seems stable and telemetry from volunteers is coming into the pcsat.aprs.org site OK. I am torn between using my UHF receiver for montoring PSAT PSK31, or concentrating on BRICsat.. But we need to figure out what is going on with BRICsat and try to rescue it. The PSK transponder on BRICsat is newer and better. I had been commanding PSK on PSAT to ON on every pass. But realized that would be masking the weak PSK31 beacons from BRICsat. SO I have stopped doing that. Now PSAT PSK is in auto – meaning it will come on if there is a user, but otherwise it will only come on once every 5m with a beacon. I will be going on travel for a week starting tonight, and so PSAT is on its own. The BRICsat command team will be returning to the Academy on Wed and may begin command efforts then. Hence the value of capturing any data to point them in the right direction. Bob, WB4APR

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OSCAR News articles wanted + Adding new sats to SatPC32 and Gpredict
by M5AKA 27 May '15

27 May '15

Any articles for the next issue of the AMSAT-UK publication OSCAR News would be gratefully received by the Editors Jim Heck G3WGM and Graham Shirville G3VZV. Their contact details are at http://amsat-uk.org/about/contact-us/ The LightSail satellite has stopped transmitting. The team is attempting a reboot.The telemetry data is sent on a downlink of 437.435 MHz, AX.25, 9600 bps FSK. http://amsat-uk.org/2015/05/26/lightsail-1-stops-transmitting/ UK radio amateurs use PSK31 satellite transponder http://amsat-uk.org/2015/05/26/uk-hams-use-psk31-transponder/ 29 MHz – the forgotten frequency for amateur radio satellites http://amsat-uk.org/2015/05/25/29-mhz-satellite-uplinks/ Nine CAS-3 amateur radio satellites to launch in July http://amsat-uk.org/2015/05/24/nine-cas-3-ham-radio-satellites/ Adding new satellites to SatPC32, Gpredict and Nova http://amsat-uk.org/2013/11/23/adding-new-satellites-to-satpc32/ 73 Trevor M5AKA ---- AMSAT-UK http://amsat-uk.org/ Twitter https://twitter.com/AmsatUK Facebook https://facebook.com/AmsatUK ----

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Re; PSAT in HRD
by Joe Fitzgerald 26 May '15

26 May '15

>Is there an old 'PSAT' ? AMSAT has never listed any other spacecraft as PSAT. In general, the TLE's in nasabare.txt are the best available and are updated as significantly better element sets present themselves. In the last week I have been using elements provided by USNA and the Planetary Society as appropriate for PSAT, BRICsat and Lightsail. Once NORAD has sorted out all the objects from this launch, they will be updated weekly with the other objects in nasabare.txt ISS continues to be updated at least daily with data from NASA Johnson space flight center. - Joe KM1P

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report rx PSAT-1
by Pablo J.M. - LW8EXS 26 May '15

26 May '15

TIME UTC 22:48 2:Fm PSAT-1 To APOFF Via ARISS <UI R Pid=F0 Len=34> [19:48:08R] T#381,840,089,671,824,808,00011100 Pablo - LW8EXS Buenos Aires - Argetina

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by rupeshdlad2738.rl＠gmail.com 26 May '15

26 May '15

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PSAT in HRD
by Ted 25 May '15

25 May '15

Question: My HRD Sat program is now pulling keps (from amsat, Celestrak and NORAD links) and lists a satellite as 'PSAT'. However, I question that as the program is not yet listing ULTRSat3, as Bob B. has published. Is there an old 'PSAT' ? Also, is there another graphical site that shows the current 'PSAT' location web or android phone) Tnx, K7TRK

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ULTRAsat telemetry
by Mark Johns 25 May '15

25 May '15

I copied the following BPSK31 this morning at around 1410z on 435.350 FM. Now I just need to figure out what I was hearing and how to make sense of it! Any help? Is this PSAT? W3ADOhel tee{ n ete nw 90 23 790 255 +12 sa i W3ADO-5 beacon B 037 37 23 782 257 +14W3ADO-5 beacon B 040 34 23 799 257 +7 i to nie( i QTetiee t/l iW3ADO-5 beacon B 041 34 23 787 257 +9 f t W3ADO-5 beacon B 042 06 23 782 260 +12 v « W3ADO-5 beacon B 043 71 22 781 259 +14 t oeen W3ADO-5 beacon B 047 65 23 777 258 +17 te W3ADO-5 beacon B 048 53 23 776 256 +18 thl aW3ADO-5M a at t n o saot0 t: eoo ee W3ADO-5 beacon B 000 34 23 787 257 +16 tAW3ADO-5 beacon B 001 40 23 776 256 +18 r e ttuoe eietW3ADO-5 beacon B 002 40 25 785 258 +17 9tetW3ADO-5 beacon B 003 40 23 775 255 +19 nan e o f t eno -- Mark D. Johns, KØMDJDecorah, Iowa USA EN43----------------------------------------------- "Heaven goes by favor; if it went by merit, you would stay out and your dog would go in." ---Mark Twain

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W5PFG/VE2 - FN35 & FN26
by Clayton Coleman 25 May '15

25 May '15

I'll be visiting Montreal, QC, Canada again in a couple of weeks. Several individuals have asked me about operating satellites from grid FN26. With those requests in mind, I will travel to FN26 for two orbits of FO-29. I do not know the specific passes at this time. There are a few others who are looking to have FN35 confirmed. I will post about those operations on Twitter @w5pfg shortly before and during the US Memorial Day Weekend Holiday. Please email me off-BB if you are interested in the FN26 operation. Thank you, 73 Clayton W5PFG

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Psat transponder
by Roland Zurmely 25 May '15

25 May '15

My PicFall signal via Psat transponder !Up 28,120 kHz USB 10W dipole antenna. <http://www.qsl.net/py4zbz/psat.htm#a> 73 de Roland PY4ZBZ in GH70un

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Re: [amsat-bb] PSAT and Bricsat FM PSK on same frequencies
by Tom Schuessler 25 May '15

25 May '15

Bob, Your explanation to my questions make much more sense now that I worked another pass of the satellites. Today the two were sufficiently separated that I could see one lagging behind and thus higher up in frequency because of Doppler shift. Your explanation on why the same frequencies for the two birds is quite nice. Also the frequency offset difference for the PSK beacons as well as the different IDs work as well. Bricsat was quite a bit weaker but that was probably because I was trying to track PSAT with my Arrow on a tripod. It was also a couple of Khz higher up. I also saw the difference in the two beacons so now I know how to tell which from which. I did try transmitting PSK31 USB on 28.120 + 1Khz or so and listening through HDSDR on 435.350. I heard faint signals of other PSK signals but believe they were just some other terrestrial QSOs and not directed through the satellite. They were slipping down the DIgipan waterfall as they would be without correction. I was not doing correction either on 28Mhz but I was hoping, even on playback of the HDSDR I/Q recording, to find me but I never did. Going to try a different software configuration next weekend to try and hear myself live. The best time to test PSK through these satellite transponders will be overnight passes when possible so as to avoid terrestrial stations from calling other terrestrials and confusing things. Will have to wait for times to shift for that. 73, Tom, N5HYP ____________________________ Message: 11 Date: Sun, 24 May 2015 10:56:55 -0400 From: Robert Bruninga <bruninga(a)usna.edu> To: amsat-bb(a)amsat.org Subject: Re: [amsat-bb] PSAT and Bricsat FM PSK on same frequencies Message-ID: <835f099c08a7be546571f9704a1ed498(a)mail.gmail.com> Content-Type: text/plain; charset=UTF-8 > ... how will this work with two FM satellites on the same frequency? The idea is to serve users no matter which spacecraft is in view. And to not have the users have to always change frequencies and track different objects. Imagine a camper in the field. Just point your beam towards AOS generally and set +5 KHz tuing and when a satellite comes into view, you can use it. Many things separate them: 1) Distance 2) Time 3) Doppler 4) Users antenna beamwidth When they are 5 minutes apart, the beam headings will be over 90 degrees apart (10 to 15 dB separation), the Doppler will be typically 10 KHz (10-15 dB separation) for a total of 20-30 dB or more to prevent capture effect. Since an orbit is 95 minutes long, and the satellites will drift, then 95% of the time, this condition of at least 5 minute separation, will be met. PSAT PSK (W3ADO-5) was built over 3 years ago and is hardwired to power up by default (maximum chance it will work despite spacecraft packet link or other failures) BRIC PSK (W3ADO-6) was built just last year and has independent control by Brno designers (can be off while sats are adjacent) It also powers up by default (again, for maximum availability in case of bus failure). So I think the choice pretty much meets the goals of maximum availability to users and as independent of spacecraft failures as we could make them. Hope that Helps. Bob, WB4aPR

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