[amsat-bb] Circularity question.
Do I go RHCP on the downlink and LHCP for the uplink or vice versa for Mode B? I may add RH/LH switching later but for now my new antennas will be fixed. Is there a reference that speaks to this issue? 73, Tom K5VOU ___ Sent via AMSAT-BB@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
[amsat-bb] Possible Delay For Mars Science Laboratory Landing Telemetry
http://spaceflightnow.com/atlas/av028/120716relay/ 73s Bernhard VA6BMJ @ DO33FL ___ Sent via AMSAT-BB@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
[amsat-bb] Re: ao-7 antennas for portable use
Norm, I use an Elk log periodic for AO-7 and all my other satellite work. I am able to work passes to the predicted LOS time, subject to local surroundings. I was only able to work down to 4 or 5 degrees elevation with my Arrow dual-band Yagi, before I switched to the Elk. You can see this setup in action working satellites - including AO-7 mode B - in some of my videos at: http://youtube.com/va7ewk For AO-7 in mode A, the Elk is my 2m antenna, and a Buddipole dipole on its tripod and telescoping mast is used for the 10m downlink. Since this requires more setup, and the 10m downlink is weaker than the 2m downlink, I don't work mode A very much. 73! Patrick WD9EWK/VA7EWK http://www.wd9ewk.net/ On Monday, July 16, 2012, Lizeth Norman wrote: > Hi all! > Just wanted some comments as to what ops are using for AO-7 portable. > More importantly, some info on how they perform near loss of signal. > Pictures of antenna arrays would be greatly appreciated. > Norm n3ykf > ___ > Sent via AMSAT-BB@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-BB@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
[amsat-bb] If you can't get enough Bob Bruninga
Very interesting article by Bob on page 41 of the August 2012 QST. 73 W9KE Tom Doyle ___ Sent via AMSAT-BB@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
[amsat-bb] Max Range Sat Contacts - Question
The recent record contact between OM3BD and AC0RA peaked my interest in the subject. Congratulations and thanks to both of them. Stuff like this gets even old geezers like me excited. This is slightly technical and there is a question. I was testing my pass prediction program and found that my program indicated that a contact between my location and JO41KW was not possible. I use JO41KW since it is sort of on the edge and DK1TB lives there. I checked and found that SatPC32 indicated that a contact was possible using FO-29. I knew that nothing could be wrong with SatPC32 so I dug a little deeper. You may know this but FO-29 is a little different than most of the other LEO satellites. It has a very high eccentricity compared to the rest of the fleet. To try and speed up my calculations I was calculating the diameter of the coverage circle and comparing it to the distance between the two locations. If the distance between the stations was longer than the coverage circle diameter I dumped it. This worked fine for everything but FO-29. With the current LEO sats it is easy to forget about eccentricity. There is a difference between the minimum and maximum coverage circle diameter of 910 miles for FO-29. By comparison AO-27 has only a 67 mile variation. QUESTION: This eccentricity might result in a longer delay between good passes for max range contacts. You need the satellite to be in the right spot and at the max altitude to get a max range contact. The unknown at this point is the effect of inclination. It seems as if a satellite with a very low inclination and stations are located at high latitudes could result in a condition where a contact would not be possible even though the distance between them is within the coverage circle diameter. With the speed of our present computers and the simplicity of the calculations it is easy to just brute force it and check to see if contacts are possible but I wonder if anyone has looked at the effect of inclination and station latitude on max range. AO-27 Min Elev: 0 Coverage Circle Diameter (Miles): 3756.9 To 3823.1 Location1 Lat: 43.104167 Long: -89.458333 Grid: EN53GC Location2 Lat: 51.937500 Long: 8.875000 Grid: JO41KW Distance between locations (Miles): 4270.3 Contact theoretically not possible using AO-27 Theoretically possible using: AO-07 Coverage Circle Diameter (Miles): 4896.0 To 4932.4 FO-29 Coverage Circle Diameter (Miles): 3814.7 To 4724.8 - 73 W9KE Tom Doyle ___ Sent via AMSAT-BB@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
[amsat-bb] Final Call for Papers--2012 ARRL/TAPR Digital CommunicationsConference
Technical papers are solicited for presentation at the 31st Annual ARRL and TAPR Digital Communications Conference to be held September 21-23, 2012 in Atlanta, Georgia. These papers will also be published in the Conference Proceedings (you do NOT need to attend the conference to have your paper included in the Proceedings). The submission deadline is July 31, 2012. Please send papers to: Maty Weinberg ARRL 225 Main St Newington, CT 06111 ...or you can make your submission via e-mail to: m...@arrl.org Papers will be published exactly as submitted and authors will retain all rights. 73 . . . Steve, WB8IMY ARRL ___ Sent via AMSAT-BB@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
[amsat-bb] SO-50
Does anyone have a recording of the July 16, 2012 0230z SO-50 pass? I made several contacts but my recorder didn't work. Thanks. Jim - K0BAM ___ Sent via AMSAT-BB@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
[amsat-bb] Re: ao-7 antennas for portable use
Hi Norm, You asked about ... > Pictures of antenna arrays would be greatly appreciated Bill, OM3BD posted photos about their AO-7 setup when he and Wyatt, AC0RA set the new distance record on that satellite. Here is the link to Bill's web page: http://www.qsl.net/nz5n/AO7record.htm -- 73 de JoAnne K9JKM k9...@amsat.org ___ Sent via AMSAT-BB@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
[amsat-bb] ao-7 antennas for portable use
Hi all! Just wanted some comments as to what ops are using for AO-7 portable. More importantly, some info on how they perform near loss of signal. Pictures of antenna arrays would be greatly appreciated. Norm n3ykf ___ Sent via AMSAT-BB@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
[amsat-bb] ZACUBE-1 Mode L/S Transponder
One of the mission objectives of ZACUBE-1 is a 115200 bps L-Band to S-band data transponder. See http://www.uk.amsat.org/8930 73 Trevor M5AKA AMSAT-UK International Space Colloquium Sept. 15-16 http://www.uk.amsat.org/colloquium/twelve AMSAT-UK News on Twitter: http://twitter.com/AMSAT_UK ___ Sent via AMSAT-BB@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
[amsat-bb] Re: Mode S?
Hi Bob...maybe someday we will have some mode S stuff...the last time was on AO-51 before the battery problems...I have a small portable -35dbm sig gen that I can use to play with my various downconverters and dishes. Yes AO-40 sobsob. 73 Bob W7LRD - Original Message - From: "Bob DeVarney W1ICW" To: amsat-bb@amsat.org Sent: Sunday, July 15, 2012 4:52:42 PM Subject: [amsat-bb] Mode S? Are there any satellites still transmitting on Mode S? I still have my Mode S setup on the tower from the AO-40 days, and to would be nice to check it out to see if it still works.. I guess I could go snooping for cordless phones in the neighborhood, but I'd prefer to check it out with something of a ham nature. 73 de W1ICW ___ Sent via AMSAT-BB@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-BB@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
