[Milsurplus] AN/APA-38 Panadaptor

[Michael Hanz]

The APR-4Y was part of the AN/ALR-5, which was an early 1950s Korean War 
revision of the WWII equipment.  My manual is dated 1955.  It was 
composed of two different parts - the R-444/APR-4Y receiver, and the 
CV-253/ALR four band plug-in "Electronic Frequency Converter" covering 
38 to 1,000MHz that you mentioned, which was way beyond the original 
individual tuners in sensitivity and selectivity.  The manual is T.O. 
12P3- 2ALR5-2.

- Mike  KC4TOS

On 9/27/2023 4:32 PM, Ray Fantini wrote:
> Ok, so it's a AN/ALA-2 or 10 that I want. Thanks for the information. 
> While we are on the subject when was the APR-4Y interduce? Looks 
> something like the old 4 but uses all miniature tubes and has the FM 
> detector that makes it way more fun than the regular 4
>
> Ray F/KA3EKH
>
> ------------------------------------------------------------------------
> *From:* Michael Hanz <aaf-radio-1 at aafradio.org>
> *Sent:* Wednesday, September 27, 2023 4:25 PM
> *To:* Ray Fantini <RAFANTINI at salisbury.edu>; 
> milsurplus at mailman.qth.net <milsurplus at mailman.qth.net>; 
> mrca at mailman.qth.net <mrca at mailman.qth.net>; MMRCG <MMRCG at groups.io>
> *Subject:* Re: [Milsurplus] AN/APA-38 Panadaptor
>
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> The AN/APA-38 was more associated with the APR-1 and earlier APR-4 
> series, Ray - thought they all worked with the 30MHz output of the 
> receivers.  The mate to the APR-4Y was also the AN/ALA-2 (and 
> AN/ALA-10, like the one below). These last two were identical except 
> for the addition of a small "look-through" module that allowed seeing 
> through momentary gaps in the associated jamming transmitter to see if 
> the enemy radar was still pinging.  They all used 400Hz power.
>
> - Mike
>
>
> On 9/27/2023 3:50 PM, Ray Fantini 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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