[MRCA] [MMRCG] AN/APA-38 Panadaptor

[Tim]

Hi Ray - Sounds like a fun project.  I don't have a display for my APR-1
either but I needed a portable ESM spectrum analysis receiver that covered
30-500 mc.  Doesn't seem to be something available in "military surplus" so
I built my own in an ammo can.  Based on an old analog TV tuner module
driven by a ramp generator for the tuning sweep.  Works great with an
external scope.
http://www.n6cc.com/wp-content/uploads/IMG_0054-e1458011527563.jpg
http://www.n6cc.com/wp-content/uploads/IMG_0059-e1458011757632.jpg

"No signal goes unnoticed..."
Tim
N6CC

On Wed, Sep 27, 2023 at 12:50 PM Ray Fantini <RAFANTINI at salisbury.edu>
wrote:

> Is doing something completely pointless sane? I was recently so impressed
> by some of the aircraft radio dioramas at Gilbert that I have decided that
> I would like to try to attempt one myself.  First let me start by saying
> that one of the tools I use at work almost all the time is a spectrum
> analyzer, everyone knows that much has been rolled out in the past years
> from companies like Rigol with a line of spectrum analyzers with internal
> tracking generators for under one thousand dollars or the little Nano VNA
> vector network analyzers so today anyone can have a spectrum analyzer or
> VNA that would have easily cost five or ten grand ten years ago, and brand
> name analyzers like the HP ESA family and not out of the range of most
> people, but I want to take a giant leap backwards and build up my EW/ECM
> warfare “primitive” analyzer by kitting out my APR-4Y with a AN/APA-38
> panadaptor.  The old APR-1 and 4 all worked with a larger display, the
> APA-10 but never warmed to those old receivers being the 4Y had just one
> head for covering all four bands and had enough sensitivity to almost be
> called a receiver along with an added FM demodulator.  I have a APR-4Y
> with head and rack but lack the AN/APA-38 scope and think if I can come up
> with one that would be the good basis for a complete search receiver from
> the old days, a primitive spectrum analyzer.
>
> So if anyone has one that can be talked out of please let me know.
>
> Have already seen where a ARC-21 has shown up so there must still be more
> unicorns out there.
>
>
>
> Ray F/KA3EKH
>
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