24 Oct
2008
24 Oct
'08
7:57 p.m.
I dont think the electrodes changed in the tubes. I think it was sine / cosine on the XY
deflection plates, (which would generate a circle).
Modulating from 0,0 to X, Y display circle max was from a sine cos pot on the antenna.
The line was drawn with a sawtooth generator at a ramp rate that was scaled to the grid
('radar mile', 1 Usec). This produced the familiar rotating radar display. Echoes
modulated Z (beam intensitiy).
Randy
From: cclist at sydex.com
To: cctalk at classiccmp.org
Date: Fri, 24 Oct 2008 13:46:48 -0700
Subject: Re: CRT displays [was: computer graphics in the 1950s]
On 24 Oct 2008 at 21:24, Tony Duell wrote:
Weren't they used for radar displays?
Cheers,
Chuck
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I just
want to mention that there were polar-coordinate tubes. They may be
Interesting,. I'd not heard of those before. I will have to try to find
some data sheets, etc.
I don't recall them being mentioned in the ook 'CRT Displays' (part of
the Radiation Lab series), but I may well have missed them.