[amsat-bb] Re: Cubesat question
pe1rah at yahoo.com
Sat Apr 12 12:30:04 PDT 2008
>From what I understood will my MODE-UV transponder not fly on P3e.
There is a Software Defined Transponder that will fly instead.
I don't know all the details as I never got the information directly, but more "discover" this every time while reading AMSAT-DL Journal.
I have requested AMSAT-DL to send me the MODE-UV transponder hardware back, so I might use it in another satellite project... however I never seen my hardware back :(
Besides that, I discovered that there were more groups working on a MODE-UV for P3e at that time (without knowing). After all, in my opinion it was a huge waste of my money and waste of my free time that I spend for P3e. I could have made several new transponders in the same time and have them maybe fly already on other satellite projects. So, thats why I now have developed this new smaller transponder for picosats as a privat project...
About my transponder on HAMSAT, it was agreed that ISRO switch transponder each one or two month. I know that it is not switched on that often, and I have send emails and letters to ISRO about their skedule several times.
Unfortunately the people are very busy by email, and by letter I do not get any response. As the hams are happy with HAMSAT I don't make a real problem of it that my transponder is not switched on that often. One day the Indian transponder will fail, and then my transponder will rescue HAMSAT again hihi...
Have a nice day,
--- On Sat, 4/12/08, i8cvs <domenico.i8cvs at tin.it> wrote:
> From: i8cvs <domenico.i8cvs at tin.it>
> Subject: Re: [amsat-bb] Cubesat question
> To: "William Leijenaar" <pe1rah at yahoo.com>, "AMSAT-BB" <amsat-bb at amsat.org>
> Date: Saturday, April 12, 2008, 5:31 AM
> 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
> > 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
> > Thats all AMSATs,
> > Enjoy the sats, and listen for Delfi... the next
> linear transponder :)
> > 73 William
> > PE1RAH
> > ---
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