----- 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
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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,
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/
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
Without to modify it by myself.
Any suggestion will be really appreciated
73's de Enzo IK8OZV
EasyLog 5 BetaTester
EasyLog PDA BetaTester
D.C.I. CheckPoint Regione Campania
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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.
Sent from Rick's gmail account
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.