[ARC5] TN 1B/APR-1 and TN 2B/APR-1 Military Radio Tuners

[Kenneth G. Gordon]

On 20 Jun 2013 at 14:19, Jim Sinclair wrote:

> Gordon,
> I was working in my dad's attic and found a TN-2b/apr-1. He worked on
> aircraft radios during WWII . Call was w6fkq. Seems to be intact. Any
> interest? Jim Sinclair

Hello, Jim:

Those tuning units will work in several similar receivers. 

The RDO is one. 

There is some interest in that series of equipment, but not as much as I think 
there should be.

The receivers were designed specifically to search wide frequency ranges to 
find the frequencies of enemy equipment, mainly radar.

Most of those TUs are pretty "deaf" in modern terms, but they were designed 
to look for signals that were very strong anyway, so it didn't matter.

The APR-1 is a simplified airborne version of those search receivers.

The RDO is very large, very heavy, and is meant to be installed on a capital 
ship.

The TUs (TNs) covered from something like 22 MHz up through at least 
10,000 MHz. Maybe even 30,000 MHz. I can't remember. Some, at least, are 
motor driven.

I have at least 6 different units here, each covering a different frequency 
range.

I sold a few duplicates to a collector in Australia a few years ago, but that 
was the only person I have ever run across who was interested, before or 
since.

He didn't pay much for them, but I was glad to get rid of them at the time to 
someone who appeared to apprecate them.

Ken W7EKB