I disagree about having to have a EME class station if we put a
transponder on the moon.
The reason being, since the same side is always facing the earth, a
directional high gain antenna may be used on the transponder itself!
Lee
W5LMM
How big antenna and what band should be used?
hola, i am trying to determine the best way to work full duplex on the birds
with 2 HT's or radios. i cannot find any info so far on the web. my concern
is to keep the transmit power out of the receive radio, i guess basically the
difference between a diplexer and duplexer. since i am
If I understand your wiring, I think you have it correct.
Is this what you are trying to do?
http://www.amsat.org/amsat-new/articles/Mode-J/
Note that for mode-B satellites where you are transmitting on 70cm and
receiving on 2m, this won't work. In my experience, the extra filtering
is also
ahoy,
thank you to Bruce-kk5do , Rick-wa4nvm , Dave-kb1vph , Greg-ko6th ,
Eric-on4hf , Scott-n1aia for the replies and help. i was looking at the
comet cf-4160 (must be the new version), if i need it, and will be on the
air from grid cn81 soon. i have a new LiIon battery on order, so
It is to bad that the concentration couldn't be on something clever that would
earn us some mass for a transponder. Like say some sort antenna that is
deplorable and would massively increase the data rates.. Like an inflatable.
Robert WB5MZO
Sent from my iPad
On May 31, 2012, at 12:46, i8cvs
AMSAT will have an AMSAT Booth, Satellite Demonstrations, and two Satellite
Talks at Ham-Com in Plano, TX, on 8-9 June 2012. The talks will be given by
Douglas Quagliana, KA2UPW/5, and Keith Pugh, W5IU. This year there will be
a Special Event activity (sponsored by the Plano Amateur Radio Klub)
Do you really mean a deplorable antenna?
73 - Keith, W5IU
-Original Message-
From: Robert G Oler orbit...@hotmail.com
To: i8cvs domenico.i8...@tin.it
Cc: Amsat - BBs amsat-bb@amsat.org
Sent: Sat, Jun 2, 2012 1:44 pm
Subject: [amsat-bb] Re: European Lunar Lander - Call for Declarations
I am not sure that the filtering from the small duplexer with the Arrow is
significant enough compared with the injection loss that it will produce.
I would try it first plumbed first directly into each radio. In this case the
biggest issue will front end overload of the rx portable, I have
fowarding this email to the bb for a local ham
73 Bob W7LRD
- Forwarded Message -
From: James Denneny 57jndenn...@comcast.net
To: Bob- W7LRD w7...@comcast.net
Sent: Saturday, June 2, 2012 1:19:32 PM
Subject: AMSAT BB
Bob
Please add this item to the BB:
AEA
It saddens me to report that a very active and positive sattelite
opperator has passed away.
Chris Heijzelaar PA5RWE has died in his sleep last night at the age of 51
just meters below his beloved loopyagies.
condolances can be left on http://www.het-bar.net
on behalf of his radiofriends I
Well just for your information, I run a FT-7900 FT-2900 right next to each
other to a 10 elem Diamond 70cm and a 5 elem Diamond 2m both pretty close to
each other and have never had a single problem.
Considering you are transmitting on 145.850 and receiving on 436.795... Hello,
a world
- Original Message -
From: Bob- W7LRD w7...@comcast.net
To: STeve Andre' and...@msu.edu
Cc: amsat-bb@amsat.org
Sent: Saturday, June 02, 2012 7:16 AM
Subject: [amsat-bb] Re: European Lunar Lander - Call for Declarations
Just for the fun of it I'd like to see an accurate link budget
Thankyou Domenico...I knew you would be able to crunch the numbers. Based on
these calculations I have just about enough left over hardware from AO-40 (
sobsob ) to make it work. Given the logistics, politics, financing etc I don't
see anything like happening anytime soon. However it never
Check http://www.amsatuk.me.uk/iaru/spreadsheet.htm for a detailed link budget
spreadsheet, with accompanying explanations.
73, art…..
W4ART Arlington VA
On 2-Jun-2012, at 01:16 AM, Bob- W7LRD wrote:
Just for the fun of it I'd like to see an accurate link budget written up.
It is a
Check also this discussion from James Miller, G3RUH:
http://www.amsat.org/amsat/articles/g3ruh/110.html
73s Peter, DB2OS
___
Sent via AMSAT-BB@amsat.org. Opinions expressed are those of the author.
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Hi All,
I am getting back QRV after a long hiatus, and recently upgraded the
shack computer to Windows 7 64-bit.. now I am trying to install the
software and drivers for my parallel port version ( metal box ) Uni_Trac
2000 rotor interface, and I can't even get the installed to run no
matter
Hi together,
Please also have a look at this document:
http://wsn.spaceflight.esa.int/docs/lunarlander/LunarLander_EIDA_CDI_230512.pdf
in particular see point 2.2.2 Communication and 2.2.3:
Visibility of the Earth from the landing site imposes the following
constraint:
• communications shall
That can't be quite right. A gain antenna can be put on the moon but its
half power beam width will be limited by libration. If we put a 2.401 GHz
dish on the thing we could easily stay inside the HPBW and likely not need
much power for a decent signal into a small dish on the earth.
The
AMSAT NEWS SERVICE
ANS-155
ANS is a free, weekly, news and information service of AMSAT North
America, The Radio Amateur Satellite Corporation. ANS reports on the
activities of a worldwide group of Amateur Radio operators who share an
active interest in designing, building, launching and
Hi Peter, DB2OS
I was reading the document in particular point 2.2.2
Communication and 2.2.3 but in my opinion the Radio
Hams are off side because everyting has been already
designed and in my opinion there is no room available
on the Lander for a Moon-Earth experimental communication
transponder
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