CRT implosions (was: Re: "screen mold")
aw288 at osfn.org
Wed Oct 5 21:55:24 CDT 2005
> There were a few that used elctrostatic that were not PPI but time domain.
If you are talking the A-scope (and variants), well, "a few" being
"most" when it comes to pre-1950 radars. The A-scope was the tube that was
used to get ranging information, using a cursor connected to a mechanical
counter (yes, the origins of the mouse, folks). Anyone that pulled range
off a PPI tube was given KP duty peeling potatoes.
> There were a variety of radars used some very crude appearing by most
> standards for display. A few the CRT was simply a scope doing TDR on the
> radar pulse and it was the operators duty corrolate the antenna position
> with the displayed reflection.
A quick glance at the azimuth indicator, a real time selsyn dial, would be
all the correlation required. The most correlation would be for the very
earliest radars, and that would be yelling at the azimuth operator to give
you a reading.
> There was at least one airborne system that
> used two smaller tubes to display azmuth and elevation based of one
> transmitted source and two seperatly recived returns.
The two scopes were a B-scope and a C-scope. They show different
projections (very handy for intercept, as the operator could
construct a 3D image of the airspace in his head). The radars you are
talking about use only one scope, and the receiver timeshares the
scope. None of the early lobe switching radars used two scopes (unless
one was just a repeater).
> There were also airborne landing aids systems that were crt based as well.
> I used to see them on Cannal st NY back when 1$ was a good hours pay.
I see these scopes all the time, as I collect radar gear.
> Yes they did. But not all. Airborne systems were prone to mechanical
> shock and that was a known thing. Having a radar fail was nearly as
> serious as damaging the trained operator.
What does this have to do with graticle thickness?
> key words, "appear much" as in not commonplace but did exist. Even the
> military had inerta.
No, they were common, even fairly early into the 1940s. Even the 12 inch
P4s for television were available in good numbers.
aw288 at osfn.org
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