Yes, alignment is very important!
In my antennas I strive for SWR = 1.0
Sigh .........
Its effective radiated power that you need to test for.
Trying to follow my friend's advice
Then ALL the individual components must be qualified for operation in a vacuum, not just a capacitor. The includes ALL solid state devices in your entire project.
Last time I spoke to the PQ guys at a conferance, it appears that is not always the case. Some launch providers do (apparently) insist on certified parts etc, but some dont, although all providers require a vacuum outgassing test.
So it depends.
A side note to that PQ conferance, I found myself sitting next to the head of the organisation that replaced\renamed NORAD. The Americans had been resticting the launches of PQs, since they claimed they could not track them on RADAR. Of course I knew this was complete non-sense, I had proved that NORAD had tracked, very accuratly indeed, my own PQ, and I told her so.
Roll forward a few years and the size of what they can track with RADAR has again been in the news.
Heat is the limiting design criteria for anything in space. All heat must be conducted to somewhere it can be radiated into space. Surely the OP has design parameters for both heat and outgassing.
Hey Paul!
I'm very curious how your SAT assigns this.
73 Victor
Heat is a problem. When the sat is in shade, heat must go out, but when it is in sunlight, heat will go in.
It can be but it depends on the orbit.
How much in the dark, how much in the sun etc.
How often you transmit etc.
I wonder how these issues were resolved in the famous AO-7
Fantastic bit of machinery.
In 1974 they didn't have Chinesium Brand capacitors.
Tom... VK3DMK.. 
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I have a QSL through this satellite
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there was a factory for the production of capacitors in my area, 30 years ago, old stocks remained, and now, when my son said that capacitors change capacitance, I was indignant, because this cannot be, they measured it with an instrument, yes, Chinese capacitors reduced the capacitance by ten times, poured old stocks on the table, we measure, for 30 years no changes, everything is great ...
HOW SO???
When Chinesium get used, their inferior ESR causes internal heat losses and they deteriorate/leak/explode.
Especially in high frequency ripple current situations.
Tom....
I'm talking about film capacitors
Hi,
I have only had problems with film caps if they are operated near their max operating voltage.
Tom...
Tom!
I don’t understand the mechanism of capacitance loss itself, for this the area of the plates or the dielectric component must change
PS what effective managers came up with so that we order capacitors more often
Hi,
Google;
how film film caps fail
This might help.
capfail.pdf (562.9 KB)
Also from an expert talking to Dave Jones.
Tom..
I was the only person to get a QSL through mine, although it was heard by heaps of hams.
Unfortunately there are only 24 hours in a day, there is not enough time or energy for everything :-)))