[Milsurplus] Radar simulator

[James Duffer]

There must be a trigger that is initiating the sweep for your display.  Using this sweep trigger to initiate another trigger delayed by whatever range you want the fake target to appear.  This would generate a phony range mark which then must then be gated on and off so that the required number of hits per scan can occur and the targets spacing established.  (they would be all at the same range, appearing as a ring of blips.  Your display may already have range marks which could be chopped up to appear as a ring of targets.  Getting a target to appear at random would require the delay from the sweep trigger to be  varied between the targets, but consistent for the generation of each target (lets say 40 hits).  That would be more involved.

Good luck with your project.

From: Military1944 at aol.com
Date: Thu, 12 Feb 2009 05:27:29 -0500
To: milsurplus at mailman.qth.net
Subject: Re: [Milsurplus] Radar simulator









Whilst replying to another message on this topic I had a brain wave.
 
There is a set time between 1 revolution of the ppi display. 
 
It is simply a matter of timing, so, as the display unit provides a pulse 
at 0 deg (top dead centre) then I could simply use this to trigger the pc, and 
after given time periods the pc could send a blip down say a USB port and drive 
the video i/p. 
 
I might have cracked it. 
 
The only snag I can now see is in the old days with Z80 and 6502 machine, 
programming was easy, even in machine code. I have no idea how to create a 
program to run under XP. So it seems I will need to solve one problem before I 
can solve the other problem. Oh dear!!
 
cheers, Ben. 
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