K2TXB har gjort en fin samanstllning med bilder mm frn hstens stora EME test, en massa fina antenn arrangemang att titta p. http://www.eticomm.net/~russk2/eme/eme.htm .
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Author: sm7wsj
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Körbara Analoga satelliter
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AO-40 Update
Hej!
Det finns inte mycket att rapportera om AO40 men en av kontroll stationerna anser sig ha hrt ngot som kan tnkas vara en signal frn AO40.
ls nedan.
***************
Yes, we already thought about this idea.. but the thing
must be reproducable, which seems not to be the case
at the moment.. So we probably have to be more patient.
73s Peter DB2OS
William Leijenaar wrote:
> Hi AMSATs,
>
> Great to hear that at least some signals were heared
> from AO40.
>
> When IHU and the L-Band are working but not the TX
> completely, it is maybe possible to upload a small
> program that measures the battery voltage and sends
> the value back to earth in CW, by just switching
> on/off the TX…
>
> Its at least a small communication :o)
>
> Just an idea…
>
> 73 de LU/PE1RAH
> William in Buenos Aires
>
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Körbara analoga satelliter
Just nu!
AO40 Tyst fr tillfllet
AO7 Krbar mest i Mode B
RS15 CW beacon hrs men ingen transponder
AO27 Har hrts men ej tillfrlitlig
SO50 Hrs ibland men sporadiskt
FO29 Gr mkt bra!
ISS Hrs p packet, har krt skolkontakter p FM
Med andra ord, senaste ren har vi frlorat mycket ssom AO10,UO14 RS12/13,FO20, och nu senast batteriproblem p AO40 (som vi inte vet var det slutar) Som tur r s byggs det i AMSAT DL en P3E som ska bli en DX satellit med bde mode B och hgre frekvenser.Vi har ju ven FM satelliten ECHO frn AMSAT NA att vnta det hr ret.
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AO-40 update
Hej! Hr r en rtt fin frklaring p Oscar 40 lget,Vi hller tummarna!! 73 Hkan
*********************************
The problem is, that the Main Battery clamps the bus voltage down toabout 14V or even less, from its nominal 24V.
As Stacey described, this is obviously due to several battery cells in the main battery, which failed shortened in some sort of domino effect.
It happened so fast, that we were not able to completely isolate the main battery and use only the aux battery. At the moment both batteries are in parallel.. this will not damage the AUX battery, but it prevents it from charging.
The extremely low battery (and bus) voltage is a problem, because the transmitters and other electronics were not designed or may not work at these low voltages..
The IHU and receivers should still work, but without telemetry it is hard to predict what the current situation really is..
Since the solar panels pump all their energy into the remaining cells of the main battery, they will indeed get very hot.. Our hope now is (and that s what is to be expected) that these cells will ventall their electrolyte and dry out. When that happens, the cells should fail high resistance and our bus voltage should come up..
Thus, the improving sun angle should help in speeding up this process.But again, we yet do not know how long this will take.. but chances not bad for this to happen..
73s Peter, DB2OS
Pres. AMSAT-DL
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