Looked at the pictures and have to say that I think the paint job and the labels are all Ham stuff. The RAS/HRO was already obsolete before the end of WW2 and have seen accounts of them in use at places like Shore Stations and for intercept work would think that there were tons of stuff available before the end of the war and would wonder why the Navy would depo one of those Dinosaurs. Don’t get me wrong, I love my RAS and think it’s a perfect example of the military version of the HRO and in the hands of a skilled operator outperforms many more modern radios, but all HRO receivers required a higher level of skill to use then a lot of the other stuff that was out there. The low noise floor of that receiver exceeds what a lot of the tube radios built in the fifties and sixties were not able to accomplish.

If anything, think that the paint job, different knobs and color labels were all an attempt by someone to make it look newer, kind of surprised they did not use the same shade of gray as the HRO sixty.

I attached a picture of my RAS.

Ray F/KA3EKH

 



From: [email protected] <[email protected]> on behalf of David Stinson via groups.io <[email protected]>
Sent: Saturday, October 14, 2023 11:27 AM
To: MMRCG <[email protected]>; milsurplus@mailman <[email protected]>; Nick England <[email protected]>
Subject: [MMRCG] Navy RAS Receiver - Better Audio Fidelity?
 
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Those who have worked on National RAS receivers:
As you probably know, the RAS was designed as a CW
receiver.  The RAS audio bandwidth drops off markedly
above about 800 Cycles.  Not good for AM or BCB monitoring.

Has anyone here found a non-destructive way to improve this?
The IFs are themselves narrow at 175 KC, so have thought of
placing resistors across those transformers to broaden them
somewhat.  Anyone worked this issue?

TNX OM DE Dave AB5S

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