The transponder noise is very audiable. I have listened (looked) to the transponder downlink with DSP waterfall and transmitted with 100w on the uplink. Not a trace of any signal. I don't think this is a polarisation matter. Normally 10w on the uplink is sufficient to get a solid signal on the downlink.
On september 15th I had a 57 signal from de DO-64 transponder and suddenly my signal disappeared. At the time beacon and transponder noise where still audiable. It looks like a problem with the receiver.
73 Rob PE1ITR
OZ1MY schreef:
Hi Mak, Yes I have made QSOs as well. Last time was 9th of September. In the start of the life of the transponder it was much easier.
I do not know what is different - but one thing could be the attitude of DO-64. If that is the course I would expect the effect to change from orbit to orbit ?
One thing that is sure is that it is on the receive side. Even without a preamplifier I can hear the noise floor of the transponder. May be something has gone wrong - only time will show.
Perhaps someone from Delfts knows ?
73 OZ1MY Ib ----- Original Message ----- From: "SV1BSX" sv1bsx@yahoo.gr To: amsat-bb@amsat.org Sent: Saturday, September 27, 2008 1:04 PM Subject: [amsat-bb] Re: Status DO-64?
Hi Ib,
tks for reply and informative note. However I wondering about the DO-64 ! If you "shoot" the satellite with 2x19 el and 70 W, I suppose the ERP from a similar system is 2-3 KWatts. In case you had not easy access to satellite with this power, I wondering what is changed, as I remember that during the first weeks of
transponder's
activation the satellite was accessible, even if somebody was using 200-300 Watts ERP (that is my max power and I managed a lot of QSOs).
Anyway, too bad if the satellite-uplink is not enough sensitive any
longer.
I can't imagine ....5-10 KW ERP uplink-power for a good enough access. This way is a non-usable object for the majority of amateur satellite operators.
73, Mak SV1BSX
----- Original Message ----- From: "OZ1MY" oz1my@privat.dk To: "SV1BSX" sv1bsx@yahoo.gr; amsat-bb@amsat.org Cc: rob@itr-datanet.com Sent: Saturday, September 27, 2008 12:46 PM Subject: Re: [amsat-bb] Re: Status DO-64?
Hi Mak and Rob, I just had a pass here over Copenhagen with max elevation of 86 degrees. I were able to hear myself using 70 W to my normal 2x19 element antenna - but very faint. I also heard a CW station. Conclusion - it is on but very difficult to use unless you have a lot of power for the uplink (more than I have). Have a nice weekend all 73 OZ1MY Ib ----- Original Message ----- From: "SV1BSX" sv1bsx@yahoo.gr To: amsat-bb@amsat.org Sent: Saturday, September 27, 2008 11:33 AM Subject: [amsat-bb] Re: Status DO-64?
Hi Rob,
I agree. Today morning I tried at 08:02 - 08:10Z, Orbit #2252,
excellent
pass for my location.
As you pointed out, I also heard the beacon with a true 559 on CW (Hi Hi DELFI-C3), however it was impossible to access the transponder.
So, your note is correct.
73, Mak SV1BSX
----- Original Message ----- From: "Rob Hardenberg PE1ITR" rob@itr-datanet.com To: amsat-bb@amsat.org Sent: Saturday, September 27, 2008 11:13 AM Subject: [amsat-bb] Status DO-64?
Hi All,
Er there station making qso's on DO-64? Last 2 weeks I tried serveal
times
but I can't hear my signal on the transponder. It looks like the transponder receiver is not working. I can hear the beacon and transponder noise very well.
73 Rob PE1ITR http://www.pe1itr.com
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Sent via AMSAT-BB@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
Sent via AMSAT-BB@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb