[ARC5] AN/APX-1 and AN/APX-2 IFF systems

[J. Forster]

They are deaf as a post only by modern standards. They have a NF in the
10-15 dB range, I think, which is comparable to ELINT receivers w/o RF amp
stages even into the 1960s, like the SR-209 or GLR-9. The tuners are
basically a preselector, mixer, LO, and sometimes an IF stage.

Fact is, because of the RADAR Equation, this kind of set doesn't have to
be very low noise. The transmitters have KW to MW EIRPs.

Best,

-John

===============



> On 2 Jan 2012 at 14:20, Mike Hanz wrote:
>
>> I think those are APR-1 and APR-4 surveillance receiver tuning units,
>> Ken.  The APX series are IFF transponder units.  I've stayed away from
>> radar collection because you can't really do anything with the stuff
>> except look at it. :-)
>
> Sigh...yes. That's about right. The tuning units are beautifully built,
> but deaf as a rock. As I
> said, I have two RDOs, and at least one APR-2, maybe even an APR-4, but
> really don't have
> any use or appreciation for any of them. I got them in a load (about 5
> tons) of receivers from
> an estate left to me by an old boss (1970s).
>
> I think the RDO's were about 1 ton for the pair. ;-)
>
>> Happy new year,
>>    - Mike
>
> And Happy New Year to you, Mike, and everyone else here.
>
> I and the family are still in Texas, near Houston, where we have been for
> the past 10 days.
> We came down here for our middle son's wedding, which took place on
> December 28.
>
> Can't wait to get home to Idaho.
>
> Traffic down here is a singular wonder to behold!!!! :-(
>
> Ken W7EKB
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