[Milsurplus] radar help - Army/Navy countermeasures equivalents

[Mike Hanz]

Correctamundo.  There are a number of other WWII JAN Army/Navy 
countermeasures equivalents, like:
.
AN/APR-5 = AN/SPR-2
AN/APT-1 = AN/SPT-1
AN/APT-2 = AN/SPT-2
AN/APQ-2 = AN/SPT-4
AN/APQ-9 = AN/SPT-5
.
Generally speaking, the innards were all the same between an Army/Navy 
pair - it was only the dust cover and shock mount that differed.  I have 
a manual excerpt for the APA-6 at http://aafradio.org/docs/APA-6.html 
and it records in part, "It [SPA-1] also uses a heavy steel dust cover 
which gives it adequate protection against damage due to placement of 
heavy objects on its top surface."  I guess the shipboard Navy tended to 
put stuff on top of the equipment - anathema in a flight situation.

On 8/15/2010 11:16 AM, WA5CAB at cs.com wrote:
> 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  Superseded by the AN/APA-11, which eliminated the flaky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... :-)
>