[Milsurplus] RADAR Simulator Question

[n griggs]

I first saw one of these in high school!  We had a student run radio/tv studio and broadcast on the local cable system.  When we weren't running programming, the flying spot scanner - a B&K TV Analyst - was used for the video and a FM radio tuned to the local NPR station was the audio.  The unit was about 15 inches wide by 8 inches deep by 8 to 10 inches high.  There was a lid over the main section allowing you to change the graphic sheet then closing it to keep external light from shining in.  The only draw back was the heat created by the tubes used inside - horizontal oscillator & output and vertical oscillator.  The graphic sheets were the same kind used for overhead projectors.  You can also use clear plastic and a grease pencil but the heat may make the printing run after a while.  Dry transfer lettering could also be used.  I haven't seen one in AGES!!!  This was back in the early 70's.  We only used the video output on the unit.  It
 also had sweep outputs as well as selectable frequencies for IF and tuner front end alignment.  I think it also had a color bar generation circuit as well.

Neal KC4YCM

--- On Fri, 10/9/09, J. Forster <jfor at quik.com> wrote:

From: J. Forster <jfor at quik.com>
Subject: Re: [Milsurplus] RADAR Simulator Question
To: "Tony Snider" <trsnider at cox.net>
Cc: milsurplus at mailman.qth.net
Date: Friday, October 9, 2009, 11:35 AM

Hi Tony.

I've reported the bounces to the Postmaster. Thanks.

Interesting. They are called flying spot scanners.

At present we are looking at doing the scene simulation digitally, but the
capability to scan in maps might be very useful. I'll get back to you in a
few days. OK?

How big are the units physically? Can you try emailing me a pic in a day
or so?

Best,
-John

=============


> 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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