[Milsurplus] [MRCA] AN/APR-4Y

[J. Forster]

I'd like a copy of the photo, please.

The sensitivity of a RADAR ELINT receiver does not have to be super. If it
is alive at all, it will see the RADAR long before the RADAR can possibly
see you.

-John

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



> Have been wasting tons of time on primitive counter measure receivers that
> I bought at Dayton, mainly an AN/APR-4Y Have known that the APR-1, 4 and
> RDO were all sort of dogs being all octal base tubes and not supporting FM
> but somehow always held out hope for the APR-4Y being that it was a later
> design and used seven pin tubes (6AK5, 6AL5) and the like that maybe
> provided somewhat better performance. The thing is I am finding out that
> there is almost nothing out there on these radios, wanted to know if
> anyone had any information on them or something like a manual. Both the
> APR-4 and the Y have the schematic located under the cover of the IF deck
> and I did photograph and clean up a picture of the schematic for the
> APR-4Y if anyone wants one but a couple things I have been looking for are
> (1) what is the B+ voltage that was provided to the tuning heads? Think it
> may be +300 but not cetin. (2) What was the rated sensitivity for the
> APR-4 in AM narrow and wide? And what was it for the 4Y in AM narrow, wide
> and FM? (3) Is the CV253/ALR multiband head the only correct head for the
> 4Y being that I don't have it have been working with a TN-17 head from a
> regular APR-4, and last but not least I now realize that the APA-10
> Panadaptor appears to be a correct display for that receiver. Saw two at
> Dayton including one in good condition but did not buy it and am now
> regretting it.
> Ray F
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