[Milsurplus] RADAR Simulator Question

[Francesco Ledda]

The AN/MPQ-T1 had two monstreous scan converters to simulate the drop  
of chaff. The CRT-Videotubes were a big pain to align. Amazing 60s  
technology, Nike people know what I am talking about....

Sent from my iPhone


On Oct 9, 2009, at 6:25 PM, n griggs <n_griggs at bellsouth.net> wrote:

> 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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>
>
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