Hi Tom:
The vacuum tube dates from the early 1900s and shortly thereafter
RDF of all kinds followed.
It's interesting that Robert Watson Watt, the inventor of RADAR
while working for the weather service developed a direction finder
for lightening strikes that had application to aircraft radio
beacons.
https://prc68.com/I/InstantaneousDirect-readingRadiogoniometer.shtml
More about Radio Direction Finding at:
https://prc68.com/I/RDF.shtml
--
Have Fun,
Brooke Clarke
https://www.PRC68.com
axioms:
1. The extent to which you can fix or improve something will be limited by how well you understand how it works.
2. Everybody, with no exceptions, holds false beliefs.
-------- Original Message --------
Date: Thu, 27 Jul 2023 11:02:34 -0700
From: Tom Brent <[email protected]>
To: "[email protected]" <[email protected]>
Subject: [Milsurplus] NAVAIDS
Message-ID: <[email protected]>
Content-Type: text/plain; charset="utf-8"
Can anyone point me to information regarding when dedicated aeronautical non-directional beacons were established? An article in the February 1935 issue of Aero Digest by Fred Lutz talks about the Kruesi radio compass being
?available for the first time for the use of air transport lines, commercial operators and private pilots?
and further, that it had been adopted by the US Army Air Corps. However, it also states that it will work as long as there is a broadcasting station within the sets range and I?m interpreting this use of the term ?broadcasting station? to mean a commercial radio station operating in the AM broadcast band. The Kruesi receiver tunes 150-1500 KHz.
The establishment of low frequency radio range systems (A-N radio ranges) is well documented online but it is the simple NDB that I?m curious about. I?ll continue along my course of looking through old aviation magazines but if anyone could steer me on the correct bearing to find this information it would be appreciated.