[Milsurplus] radar help

[WA5CAB at cs.com]

So AN/SPA-1 would or could have been paired with AN/SPR-1.  Which has a 
similar manual in that it covers both AN/APR-1 and AN/SPR-1.

In a message dated 8/15/2010 5:11:59 AM Central Daylight Time, 
aaf-radio-1 at aafradio.org writes: 
> The aircraft version of the AN/SPA-1 is the AN/APA-6.  The only 
> difference between the two appears to be a steel cover and a shipboard 
> shock mount.  Since it works off of the video (wideband audio) output of 
> any surveillance receiver, it saw wide usage in signals analysis early 
> in the war.  Superseded by the AN/APA-11, which eliminated the flaky 
> meter in favor of direct comparison on the scope of two signals with a 
> Lissajous approach.  The tech manual has both designations on the cover. 
> See http://aafradio.org/countermeasures/surveillance_bay.htm for a 
> description.  It is not complete without the O-10/APA-6X, so there are 
> actually two boxes to look for... :-)

Robert Downs - Houston
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