[amsat-bb] Re: Status DO-64?

Sat Sep 27 14:24:00 PDT 2008

During the 20:45 UTC pass over Delft I uplinked a pulsed carrier to
test the transponder functionality.
The 10 pulses with various length were successfully received by our
omnidirectional SDR station within the passband. The used power was
75W with 14dBd antenna gain. (about 1.8kW ERP)
The transponder is working just fine at that moment.
However, We are still interested in all of your uplink experiences and
signal reports.

73's

Wouter Weggelaar
PA3WEG
Delfi-C3 Team

On Sat, Sep 27, 2008 at 3:07 PM, Rob Hardenberg PE1ITR
<rob at itr-datanet.com> wrote:
> 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 at yahoo.gr>
>> To: <amsat-bb at 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 at privat.dk>
>>> To: "SV1BSX" <sv1bsx at yahoo.gr>; <amsat-bb at amsat.org>
>>> Cc: <rob at 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 at yahoo.gr>
>>> > To: <amsat-bb at 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 at itr-datanet.com>
>>> >> To: <amsat-bb at 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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>>> >> > author.
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>>> >>
>>> >>
>>> >> _______________________________________________
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>> author.
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>>> >
>>> >
>>>
>>>
>>> _______________________________________________
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>>
>>
>> _______________________________________________
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>
>
>
> _______________________________________________
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