XPost: rec.radio.shortwave
From: detritus@ix.netcom.com
John Smith wrote:
> On 11/13/2011 2:19 PM, Lord Valve wrote:
> > John Smith wrote:
> >
> >> On 11/13/2011 10:25 AM, Lord Valve wrote:
> >>> Don Pearce wrote:
> >>>
> >>>> On Sun, 13 Nov 2011 08:38:28 -0700, Lord Valve
> >>>> wrote:
> >>>>
> >>>>> dave wrote:
> >>>>>
> >>>>>> On Sun, 13 Nov 2011 11:39:03 +0000, Geoffrey S. Mendelson wrote:
> >>>>>>
> >>>>>>>> It is much more important to know exactly how long and how well your
> >>>>>>>> satellite is going to work than to hope to get longer by using a
> >>>>>>>> technology that might last longer, but will more probably die
> >>>>>>>> unexpectedly when struck by a cosmic ray burst.
> >>>>>>>
> >>>>>>> Sometimes you can not predict how long a satellite will be used. A
> >>>>>>> friend of mine worked on a civilian satellite for a defense
contractor
> >>>>>>> and just before the division was sold off, cleaned out any old
documents
> >>>>>>> and files they had on it.
> >>>>>>>
> >>>>>>> Since the satellite he had worked on was way past its expected life
(but
> >>>>>>> still in use), the contracts had long expired, the work was not
> >>>>>>> classified and a new improved one was due to be launched in a few
days,
> >>>>>>> he was told to dump it all.
> >>>>>>>
> >>>>>>> A few days later, the booster exploded on the pad, and the
replacement
> >>>>>>> was destroyed.
> >>>>>>>
> >>>>>>> The sattelite was kept running for many years, although there were no
> >>>>>>> documents on what to do or how it was built.
> >>>>>>>
> >>>>>>> Geoff.
> >>>>>>
> >>>>>> What good is a diagram if the unit is 24,000 miles in the air?
> >>>>>
> >>>>> It had better *not* be in the air... ;-)
> >>>>>
> >>>>> Besides - I saw mention upthread of using the ambient
> >>>>> vacuum with just the tube elements, rather than a typical
> >>>>> evacuated glass (or other material) enclosure...is the
> >>>>> vacuum in geosynchronous orbit really hard enough?
> >>>>> It would seem to me that there are probably plenty of
> >>>>> gas molecules floating around at that height, even if
> >>>>> it would still qualify as a "soft" vacuum. Anybody?
> >>>>>
> >>>>> Lord Valve
> >>>>>
> >>>>>
> >>>>
> >>>> For all sorts of other reasons, standard enclosed tubes are used. Main
> >>>> reasons are first to contain the electrons so other metalwork doesn't
> >>>> get involved, and second to maintain the correct physical positioning.
> >>>> The helix is of very fine tolerance in both pitch and positioning.
> >>>> Space is certainly hard enough, but the environment around a satellite
> >>>> is frequently not space, but a diffuse cloud of exhaust gas which
> >>>> would extinguish a TWT immediately.
> >>>>
> >>>> d
> >>>
> >>> Ah. Good point!
> >>>
> >>> Satellites do indeed need to use propellant of some sort
> >>> to keep in position; I didn't think of that at all. And it
> >>> would seem that even if the ambient vacuum were
> >>> hard enough, conventional construction of the TWT
> >>> would be needed to keep contaminants out of it during
> >>> the satellite assembly process down on Terra firma.
> >>> But I must admit, the idea of using ambient vacuum
> >>> tickles my fancy a bit. ;-)
> >>>
> >>> Lord Valve
> >>>
> >>>
> >>>
> >>
> >> I don't recall anyone ever claiming there was no enclose on the devices
> >> ... just the reasons for enclosing them the way we do on earth is now
> >> gone ...
> >>
> >> Regards,
> >> JS
> >
> > Do you actually read this shit, or have you been into the medicine cabinet?
> >
> >
> > Lord Valve
> >
> >
> >
>
> I usually don't read imbecilic stuff ... such as yours. But, if I do, I
> certainly do not take it seriously ... perhaps you will have better luck
> with others.
>
> Regards,
> JS
Oh.
So, you're just another garden-variety cunt.
Y'all have a Real Nice Day now, y'heah?
Got guns?
Lord Valve
American - so far
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* Origin: you cannot sedate... all the things you hate (1:229/2)
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