[Milsurplus] Radar simulator

[J. Forster]

What I was trying to do is build something that would give a realistic
display of what an operator would see on the PPI, perhaps on the way out
of port or during some battle. The battle would be a lot easier to
simulate than a complex coast line. An authentic simulator would likely
not do that.

Another way to do the job is with a flying spot scanner. You'd use the
yoke azimuth synchro signals to make a DC voltage proportional to the sin
and cos of the yoke angle and pass the sweep through analog 4 quadrant
multipliers and hence to the amps of an X-Y monitor. Then you'd overlay an
optical mask and use a photodetector to generate the video for the mixer
driving the IF. I thought some about this option, but, all in all, the
digital implementation with the EPROM seems simpler, except for generating
the digital data.

The radars I'm working with also have A and R scopes, in addition to PPIs,
and the simulator I suggested will drive them all properly.

It would also be fairly easy to add aircraft targets.

Best,
-John




> I never thought about it when Ben first posted this as he obviously had
in mind building something like what John was talking about.  I never
used them as
> I was always a Comm Tech but the Radar Techs had a simulator that they
could
> use for working on the PPI's for example when we were in port and all
the radars were locked out.  I don't even recall any nomenclature except
to say the it
> probably began with "SM-" (but there were several other classes of
simulator,
> microphone, antenna, etc.).  If you could find a tube type one it should if
> nothing else be cheap.
>
> In a message dated 2/11/2009 5:24:41 PM Central Standard Time,
> trsnider at cox.net writes:
>>  I have a radar simulator here for a commercial furuno radar has lots of
>> good targets. but the down side it generates "bearing pulses"   which
is on
>> optical pick up on the antenna and generates  a square wave
proportional to
>> antenna speed, and a "heading flash" pulse when the antenna passes 0
deg az if
>> you could figure how to convert these two signals  to S-1, S-2, S-3
&R-1, and
>> R-2 synchro the video would be covered as well as EPROM's
>>
>> >> ----- Original Message -----
>>> From: Military1944 at aol.com
>>> To: milsurplus at mailman.qth.net
>>> Sent: Wednesday, February 11, 2009 3:25 PM
>>>  Subject: [Milsurplus] Radar simulator
>>>
>>>
>>> I have a Radar PPI indicator, which works, scan goes around tube etc etc.
>>>
>>>  I want to supply the video i/p with simulated returns. The thing
>>> revolves
>>> at a given period, stepper motor driven. Each scan from centre to edge
take
>>> so many microsecs.
>>>
>>>  So I need to store the appropriate number of scans per revolution,
>>> each
>>> scan length can be held in a memory, at some point during each scan a
value
>>> needs storing to indicate the trace to bright up and paint an image.
>>>
>>>  Fairly straight forward I would have thought but before I reinvent the
>>> wheel I was wondering if anyone else has tackled this type of project?
>>>
>>>  Ben G4BXD.
>>>
>>>
>>
>
> Robert & Susan Downs - Houston
> wa5cab dot com (Web Store)
> MVPA 9480
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