Nice, informative response Drew...I'm keeping this one on the wall! Roger WA1KAT
----- Original Message ----- From: "Andrew Glasbrenner" <glasbren...@mindspring.com> To: "William Hein" <bill.aa...@gmail.com> Cc: <amsat-bb@amsat.org> Sent: Monday, December 28, 2009 9:27 PM Subject: [amsat-bb] Re: back on the birds after 15-year absence - want tipson antenna system > Welcome back! I'll try to answer what I can. > > Questions: > > > > (1) RHCP for the V and U Yagis? Any reason to have switchable polarity? > > > Some LEOs have different circularities for different transmitters. For > example, AO-51 has both LHCP and RHCP on 70cm. The sense can also change > during a pass depending on spacecraft orientation and squint. Switchable > polarity is well worth it in my opinion. > > (3) Will next gen ham satellites have S-Band downlinks? > > > Yes, and AO-51 has an S downlink now, usually about 1 week a month. P3E > and others will have S. > > > (4) Will next gen ham satellites have L-Band uplinks and/or downlinks? > > > Yes, and AO-51 and CO-65 use L now also. Kiwisat and P3E will have L also. > > > (6) Are these the satellites currently available for 2-way QSOs? AO-7, AO-27, AO-51, SO-67 & HO-68. Did I miss any? > > > Off the top of my head, add ISS, SO-50, VO-52, FO-29 (due to return > soon), NO-44 sometimes, CO-65 for a real digital challenge. Lots of > one-way cubesats that can be fun too. > > > (7) Any pattern to when AO-7 is in Mode A and Mode B? > > > Right now the satellite is in 24/7 illumination, and the onboard timer > switches modes every 24 hours or thereabouts. Check > http://oscar.dcarr.org/ as a quick way to figure out which one is on > right now. When it returns to eclipses, it generally favors B and only > works while illuminated. > > I hope that helps. Joining AMSAT if you're not already a member is a > good way to support the program, and there is always something > interesting in the AMSAT Journal. There are several active ops in your > immediate area, including a BOD member; they may chime in. See ya on the > air soon. > > 73, Drew KO4MA > _______________________________________________ > Sent via amsat...@amsat.org. Opinions expressed are those of the author. > Not an AMSAT-NA member? Join now to support the amateur satellite program! > Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb > _______________________________________________ Sent via amsat...@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
