July 2013 - AMSAT-BB - mailman.amsat.org

Fwd: [DigitalATV] ISS HamTV presentation webcast on now
by Mark Thompson 20 Jul '13

20 Jul '13

----- Forwarded Message ----- From: M5AKA <m5aka(a)yahoo.co.uk> To: Digital ATV Group <DigitalATV(a)yahoogroups.com> Sent: Saturday, July 20, 2013 6:26 AM Subject: [DigitalATV] ISS HamTV presentation webcast on now Watch the AMSAT-UK International Space Colloquium live from Guildford UK http://amsat-uk.org/2013/07/18/webcast-of-international-space-colloquium/Tr… M5AKA __._,_.___ Reply via web post Reply to sender Reply to group Start a New Topic Messages in this topic (1) Recent Activity: * New Members 3 * New Files 1 Visit Your Group Switch to: Text-Only, Daily Digest • Unsubscribe • Terms of Use • Send us Feedback . __,_._,___

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AMSAT-UK Webcast + Cassini
by M5AKA 20 Jul '13

20 Jul '13

AMSAT members wave at Cassini http://amsat-uk.org/2013/07/20/amsat-members-wave-at-cassini/ Webcast of International Space Colloquium this weekend http://amsat-uk.org/2013/07/18/webcast-of-international-space-colloquium/

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Re: Antenna direction calibration
by Rodney Waln 18 Jul '13

18 Jul '13

hi, well i will through my $0.2 in, for my home station to get as accurate as i can, i listen for a satellite beacon on one of the SSB's set the radio to track and satpc32 to track, have a radio or wireless mic and take an ht to the roof with me,when i hear the cw tone that sounds ok i am set. then fine tune things from there, mind you i am at a 10* handicap do to thre hills around me, so it takes a few tries, i also do it almost the same way for or portable, but you get the idea, the FM sat's are point and shoot, Rodney kc0zhf

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UKube-1 linear transponder CubeSat may launch October
by M5AKA 18 Jul '13

18 Jul '13

BBC News is reporting that the UK Space Agency's first CubeSat UKube-1, being built by Clyde Space in Glasgow, may launch in late October 2013. Clyde Space Senior Systems Engineer Steve Greenland will be giving a presentation on UKube-1 to the AMSAT-UK International Space Colloquium which takes place July 20-21 at the Holiday Inn, Guildford, GU2 7XZ, UK. The Colloquium is open to all but for those unable to attend the event all 18 presentations including UKube-1 should be streamed live to the web. Further information on UKube-1 at http://amsat-uk.org/2013/07/18/ukube-1-launch/ ---- 73 Trevor M5AKA AMSAT-UK website http://amsat-uk.org/ Facebook https://www.facebook.com/pages/AMSAT-UK/208113275898396 Twitter https://twitter.com/AMSAT_UK ----

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New Radio
by Vincenzo Mone 18 Jul '13

18 Jul '13

Hi to the list, as I cannot find the piece for my TS-790E as it is discontinued, I am thinking that it is time to change my radio. Anybody can suggest me on that has already enclosed 2m, 7cm and 23cm. Also it will be wonderful if is already ready to RX and TX 9600 baud and 38k4 baud Without to modify it by myself. Any suggestion will be really appreciated 73's de Enzo IK8OZV EasyLog 5 BetaTester EasyLog PDA BetaTester WinBollet BetaTester D.C.I. CheckPoint Regione Campania Skype: ik8ozv8520 ********************************** ******* GSM +39 328 7110193 ******* ****** SMS +39 328 7110193 ****** *** 2nd e-mail: vimone(a)tin.it *** *********************************

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D STAR AMSAT users net tonight
by damon runion 18 Jul '13

18 Jul '13

https://sites.google.com/site/memphisdstar/d-satellite-amsat-net If you do not have a d star radio or dv dongle ,you can still checkin using drats , The down load is on the above link .Tonights net will be informal and open to all satellite and grid chasers. Thanks Damon WA4HFN 5in em55

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Ham Radio Workshop held at Satellite Event
by M5AKA 17 Jul '13

17 Jul '13

Good to see amateur radio involvement at the recent Small Satellite Developers Workshop http://amsat-uk.org/2013/07/17/ham-radio-workshop-held-at-satellite-event/ Other stories on the web: Earn Your Radio Merit Badge - K2BSA ISS contact Saturday http://radiofrequencyinternational.wordpress.com/2013/07/16/space-station-s… STRATODEAN High Altitude Balloon talk on Saturday to be web streamed http://amsat-uk.org/2013/07/17/team-stratodean-high-altitude-balloon-talk/ ---- 73 Trevor M5AKA AMSAT-UK website http://amsat-uk.org/ Facebook https://www.facebook.com/pages/AMSAT-UK/208113275898396 Twitter https://twitter.com/AMSAT_UK ----

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Space Track TLE Retriever 2 Error Message
by Rick Walter 17 Jul '13

17 Jul '13

Just tried to download new Keplerian elements with Space Track TLE Retriever 2 provided by CelesTrack and got an error message saying I should check credentials. Anyone else getting this message? Don't know if they are down or if I have a problem. I have been getting the latest Keps from them for at least 15 years. Rick WB3CSY -- Sent from Rick's gmail account

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Registration required for Colloquium SSTL visit
by M5AKA 17 Jul '13

17 Jul '13

As part of this weekendsAMSAT-UK International Space Colloquium in Guildford, UK there will be two opportunities to visit the satellite facilities at the Surrey Satellite Technology Limited (SSTL) Kepler building. The tour will only be available to those who have registered for it in advance. The closing date for registration is 1100 GMT Thursday. Further details at http://amsat-uk.org/2013/07/16/registration-needed-for-sstl-kepler-visit/ For those unable to get to the Colloquium you can watch the presentations on Saturday and Sunday on the BATC Live Events page at http://batc.tv/ch_live.php?ch=3 The schedule is at http://tinyurl.com/2013ColloquiumSchedule ---- 73 Trevor M5AKA AMSAT-UK website http://amsat-uk.org/ Facebook https://www.facebook.com/pages/AMSAT-UK/208113275898396 Twitter https://twitter.com/AMSAT_UK ----

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Help wanted on CP antenna design
by Phil Karn 17 Jul '13

17 Jul '13

I'm one of several adult mentors to a local high school ham club that's been designing and flying balloons. We are designing a high speed 70cm digital downlink for a future payload. One of my major concerns is frequency selective multipath fading in the 1 MHz bandwidth I plan to use as the balloon gets low on the horizon of the tracking station and the receiver begins to pick up a reflection off the ground. I think one of the simpler ways to deal with multipath is to use circular polarization on both ends. This automatically rejects all odd-order reflections (including the all-important 1st order reflection off the ground) as they have the opposite circularity sense to the direct signal and automatically be cancelled at the receiver. (CP was tried experimentally with analog TV broadcasting back in the 1970s as a means of reducing ghosting.) On the ground we'll just use a regular 70cm satellite antenna, but on the balloon I need a 70cm circularly polarized transmit antenna with a fairly wide (hemispherical) beamwidth that can maintain its circularity over as much of that as possible. I'm not an antenna guy, but my understanding tells me that a quadrifilar might be a good choice here. Any comments on this? Can anybody point me to some typical performance figures for these antennas? Again, I'm more interested in cross-polarization rejection than in absolute gain. I have plenty of link margin and I'm willing to sacrifice a few dB if necessary to get rid of those deep multipath fades. Thanks, Phil

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