[Milsurplus] RADAR Simulator Question

[Tony Snider]

John,

YOUR EMAIL ALWAYS BOUNCES!!

I have a few old FAA surplus units there is a photo multiplier tube and a
crt with what looks like a slide projector slide in between them of a map,
part of a radar display. I assume it comes out as video. I assume they were
used to provide a map overlay on a radar screen. I assume it comes out as
video, but I know nothing about them , sounds like might to the job though
Tony

----- Original Message ----- 
From: "J. Forster" <jfor at quik.com>
To: <milsurplus at mailman.qth.net>
Sent: Tuesday, October 06, 2009 1:31 PM
Subject: [Milsurplus] RADAR Simulator Question


> In designing a simulator for a WW II vintage SG-1 RADAR, a design question
> has come up.
>
> First off, the RADAR has a PPI display and the objective is to create a
> realistic looking display on the console screen and also on various
> repeater displays located about the ship (Battleship Massachusetts).
>
> Rather than stripping the guts out of the displays and replacing them w/
> LCDs, they'd prefer to emulate the original signals and use the existing
> hardware as built.
>
> The PPI displays are magnetic deflection CRTs w/ rotating yokes. Each
> display has a yoke servo that takes a synchro signal from the antenna.
> This is no problem at all. The same signal will be digitized and used as
> an address in a scene PROM or RAM.
>
> The sweeps will all be locally generated w/in the displays, requiring only
> a trigger signal as originally done.
>
> My question is about the video. We'll either inject that as an AM
> modulated signal at IF frequency or at baseband, but the issue is how many
> bits are needed to create a realistic video display?
>
> I can only hazard a guess here, as I've never tried it before. At a WAG,
> I'd say somewhere between 2 and 8 bits should suffice, but I really don't
> know. One more thing. I don't know, but don't think the RADAR has an IF
> gain that varies w/ the sweep, but am not positive.
>
> Any suggestions are welcome.
>
> Best,
> -John
>
> ==============
>
>
>
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