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

Re: [amsat-bb] PSAT key to success
by Robert Bruninga 01 Jun '15

01 Jun '15

Until we get authors adding Full duplex and AFC to their PSK31, here is a scheme that will work. Focus on the OVERHEAD pass. Horizon to Horizon. Because during these passes, the satellite is coming right at you for the first 5 minutes, and directly away from you for the next 5 minutes. This means the Doppler is nearly constant high during the first 5 minutes and then a rapid shift to a constant LOW for the last 5 minutes. And horribly shifting for the middle 1 minute. Your signal will have very little Doppler on the downlink and most anyone with any kind of PSK31 decoder will decode you fine. Don't do any frequency transmitteirn shift on the uplink or as KO6TZ says, you will cause people to lose lock.. When the satellite crosses overhead, you can then shift your TX frequency UP by 1.15 KHz and people will see you more or less back where you started... maybe. Bob, Wb4aPR -----Original Message----- From: AMSAT-BB [mailto:[email protected]] On Behalf Of KO6TZ Bob Sent: Sunday, May 31, 2015 4:39 PM To: amsat-bb(a)amsat.org Subject: Re: [amsat-bb] PSAT 1925 pass >Some of the traces I watched were pretty horribly Doppler shifted and not sure if MixW is able to decode that >coming up from ten meters and drifting like the ones I sw. From me experience on DO-64 and FO-29 using PSK31/63, I found adjusting for Doppler on the SSB up-link is a double edged sword. When the frequency is updated for Doppler, you loose sync for a few characters. If you don't correct the frequency, you will exceed the AFC limit of most programs, except WINPSK. WINPSK doesn't support multi line copy. Also using DigiPan in "munti" mode, there is no AFC. The s/w just creates another line. Pick your poison..... KO6TZ Bob _______________________________________________ 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: http://www.amsat.org/mailman/listinfo/amsat-bb

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PSAT 21:05 pass 5/31/15
by KO6TZ Bob 31 May '15

31 May '15

Contact with AA5PK Doing PSK31 on PSAT is enough of a challenge to make it fun. KO6TZ Bob

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LightSail TLE - based on ground station comm.
by Gregory Beat 31 May '15

31 May '15

2-line TLE NORAD ID: 40661U International code: 2015-025L Current LightSail TLE being used on sail.planetary.org/missioncontrol (best fit is ULTRASat8 - not confirmed) 1 40661U 15025L 15150.55115000 +.00017130 +00000-0 +45788-3 0 00150 2 40661 055.0112 297.1659 0249189 205.9605 230.4519 15.12499718001507 === w9gb Sent from iPad Air

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report RX PSAT-1
by Pablo Mühlberger 31 May '15

31 May '15

31-5-2015 21:33 UTC 2:Fm PSAT-1 To APOFF Via ARISS <UI R Pid=F0 Len=34> [18:33:48R] T#820,850,070,743,685,810,00011100 73s de LW8EXS Mercedes ( Buenos Aires ) Argentina

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PSAT 2100z 5/31/15 pass CM98
by Greg D 31 May '15

31 May '15

Hi all, Tried listening for PSAT for the first time, and had a really nice pass. I don't have the 10m uplink side configured, and this was all manually tuned. So I still have a bit of work to do, but the results exceeded my expectations. Signal peaked at S6 or so, full quieting. I think the Keps (object 90721 Epoch 150.54728009) were a little ahead of reality, maybe 30 seconds to a minute. There was some QSB, but it could also have been my coarse antenna rotation and manual tuning. Radio was a Yaesu FT-847, 2x16 element beam, and with FLDIGI on my Linux box, using the internal (motherboard) sound card. Greg KO6TH W3ADO-5 beacon B 019 43 25 800 260 +10 W3ADO-5 beacon B 020 18 23 797 260 +12 W3ADO-5 beacon B 021 31 23 806 260 +1c W3ADO-5 beacon B 000 43 26 802 249 +11 W3ADO-5 beacon B 002 99 35 796 251 +15 W3ADO-5 beacon B 003 65 30 800 252 +16 W3ADO-5 beacon B 004 99 32 802 252 +17 W3ADO-5 beacon B 007 93 42 796 252 +19 W3ADO-5 beacon B 008 87 23 796 252 +19 tuning (er, clicking) around, found... CQ CQ PSAT KO6TZ KO6TZ CQ CQ PSAT KO6TZ KO6TZ These seemed pretty solid, doppler-wise, but later I couldn't quite lock on to the subsequent QSO (doppler shift slightly too much for FLDIGI) back to the beacon... W3ADO-5 beacon B 011 31 42 798 249 +18 W3ADO-5 beacon B 000 40 31 802 248 +17 W3ADO-5 beacon B 001 81 42 795 251 +19 W3ADO-5 beacon B 002 34 31 799 251 +20 W3ADO-5 beacon B 003 87 37 800 252 +21 W3ADO-5 beacon B 006 68 38 792 251 +22 W3ADO-5 beacon B 007 87 23 792 252 +22 W3ADO-5 beacon B 008 46 43 791 250 +22 W3ADO-5 beacon B 006 37 28 817 250 +23

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PSAT 1745 pass
by David W0DHB 31 May '15

31 May '15

Copied KO6TZ, KC9DOA and N4ZQ and 2 others who's call signs did not decode here but copied a reference to PSAT Dave W0DHB DN70kc Colorado

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FS: Cushcraft 214B 2 meter beam
by John Geiger 31 May '15

31 May '15

I have for sale a Cushcraft 214 two meter beam. This beam covers 144-146mhz and has 15 elements on a 15 foot boom, 15.5 dB forward gain and a 24 DB F/B radio. Good condition it just needs a boom to mast clamp, something you can probably make up yourself. This would make a nice uplink antenna for Mode J, or Mode B receiving antenna. I am asking $60 plus shipping for it. Pickup is also possible in SW Oklahoma area. I can take paypal/check/MO. 73 John AF5CC

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4 stacked 70cm yagis for sale
by John Geiger 31 May '15

31 May '15

I have for sale a set of 4 10 element 70cm antennas. These have 6 1/2 foot booms and are end mounted. With these antennas comes the H frame stacking framework with mounting brackets. The stacking distance is 3 feet by 4 feet. It also comes with the power divider for the 4 yagis. Everything you need to get the 4 bay system going is there. The antennas are homebrew but very well made, resembling M2 yagis. This system has been used for 70cm EME with good results. The 4 antennas have a common horizontal cross boom to mount in an elevation rotor if desired. I would prefer a face to face deal but shipping is possible if you are willing to pay shipping. I can meet someone in the OKC area, around the Dallas/Fort Worth area, SW Oklahoma or North Texas. You can come to Lawton, OK and pick them up also. It might be possible to deliver this setup to Central States conference in July as well. I am not sure exactly what these are worth, but will entertain offers. This setup will give you a big signal on mode B, or great reception on Mode J, that is for sure. 73 John AF5CC

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PSAT PSK31 downlink
by David W0DHB 31 May '15

31 May '15

I've been observing that with the current keps the Downlink frequency of the PSK31 beacon is about 2Khz low. A good US pass over the US at about 1936. What I have been doing is decoding the entire 3 KHz with DM780's Supersweeper or Fldigi and fixing TX at about 600Hz. That way I catch everybody and there is no need to match frequencies. I've been trying to TX below 1KHz to minimize interfering with folks operating normal 10m PSK. Dave W0DHB

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Received PSAT for the first time.
by Eric Knaps, ON4HF 31 May '15

31 May '15

Hello, I just received PSAT orbit 161. This is what i got on my screen in mixw. W3ADO-5 beacon B 025 37 25 839 262 +8 W3ADO-5 beacon B 026 62 44 826 258 +11 W3ADO-5 beacon B 027 12 23 822 255 +13 W3ADO-5 beacon B 000 34 43 837 260 +9 W3ADO-5 beacon B 001 59 23 810 254 +12 W3ADO-5 beacon B 002 37 23 838 262 +8 W3ADO-5 beacon B 003 81 46 820 259 +12 W3ADO-5 beacon B 004 65 38 820 258 +14 W3ADO-5 beacon B 005 31 23 821 d59 +15 W3ADO-5 beacon B 006 59 37 817 256 +16 W3ADO-5 beacon B 007 75 42 815 255 +17 W3ADO-5 beacon B 008 81 37 816 257 +18 W3ADO-5 beacon B 009 90 23 814 258 +18 W3ADO-5 beacon B 012 50 23 813 255 +20 W3ADO-5 beacon B 013 28 25 810 253 +20 W3ADO-5 beacon B 014 37 23 820 257 +2d 73, Eric. -- Amateur radio station ON4HF Satellite manager UBA Member Amsat-UK Member Amsat-ON http://www.on4hf.be --- Dit e-mailbericht is gecontroleerd op virussen met Avast antivirussoftware. http://www.avast.com

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