[amsat-bb] Re: Cubesat question

i8cvs domenico.i8cvs at tin.it
Fri Apr 11 20:31:21 PDT 2008

Hi William, PE1RAH

It would be very interesting to know from you if your Mode-UV transponder



will fly or not on P3-E and eventually when.

For your information the Mode-UV indian transponder aboard of VO-52
is working very well and at present time VO-52 along with the old
OSCAR-7 is the only satellite with a linear FDMA transponder to be used
for CW and SSB so that I hope in a succesfull performance of Delphi-C3

I would like to know from you why your Mode-UV dutch transponder abord
VO-52 is not switched ON periodically with the Mode-UV indian transponder.

Congratulations for your job.

Tanks for your replay

73" de

i8CVS Domenico

----- Original Message -----
From: "William Leijenaar" <pe1rah at yahoo.com>
To: <amsat-bb at amsat.org>
Sent: Thursday, April 10, 2008 9:57 PM
Subject: [amsat-bb] Cubesat question

> Hi AMSATs,
> It has been a long time ago that I have been active "on-air", and here on
AMSAT-BB. Reason is to little time, and because of that I choose to improve
my home lab and spend my late after work hours there, and not in front of
the rigs hihi...
> It is very interresting to see the work of the Delfi team, and they are
now on the place where I was in 2005 with the Indian HAMSAT (VO-52) :)
> I can tell you its a hot place, in matters of sun and also hot (spicy)
food hihi... I wish the team a good launch, and I will spend some more time
to get my station ready to receive Delfi after launch...
> I have not been active "on-air", but even more active with designing some
new transponders. The reason I had to improve my home lab is because I
wanted to design a very small transponder, that would fit easily in 1-cube
satellite. With 0805 SMD this was even not possible anymore, so I went even
to smaller sized SMD. (I guess the next step is my own made chip hihi).
> My final design ended up in a 7cm x 7cm x 0,4cm prototype version.
> I guess this is small enough to fit in a cubesat :)
> Some details:
> Mode-B, Power supply 3.3V, >500mW PEP out, 30kHz Bandwidth (flat), with
AGC, CW beacon incl, ~200 grams weight.
> Now I am fixing up my design to get it from a home made prototype into a
more profesional "flight" version. My idea is to make several of these
transponders, and make them also available for other (cube)sat groups.
> However, now I am stuck with the question what the standards are for
mounting hardware in cubesat structures.
> I don't have a cubesat (for the moment) because they are not in the cheap
price class for me as a ham. On the other hand I have no experience in any
cubesat project, and don't know all the ins and outs.
> Maybe some cubesat expert can give me an idea how to make my final PCB
(screw holes, sizes) in an efficient way to have my 7cm x 7cm x 0.4cm fit in
other cubesat projects, in case some group will be interrested.
> Beside my analog transponder I also like to have a pacsat system, to have
it together in my future own cubesat. The pacsat system is an efficient
system and I think its worth to have it back again.
> Does anyone know if there is a group or ham that made (can make) such a
system in cubesat format ? With todays small sized, low voltage, high speed
and high amount of memory processors it should be no problem for a digital
guru I guess. (I mean the pacsat system like KO-23/25 alike).
> Thats all AMSATs,
> Enjoy the sats, and listen for Delfi... the next linear transponder :)
> 73 William
> ---
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