[Milsurplus] NAVAIDS

[Michael Hanz]

Hi Tom,

I have most of the Kreusi system put together here, missing only the 
control box, which is fairly trivial.  I have the parts to make a 
facsimile for that.  It doesn't answer your question directly, because I 
don't think Geoffrey Kreusi made any differentiation in terms of what 
his DF system was capable of receiving.  A stable signal from a known 
position is...well, the same thing.

You can read more about that in the _second_ part the web page at 
https://aafradio.org/flightdeck/1935/SCR-AE-183.html - along with some 
of the controversy at the Aircraft Radio Laboratory at Wright Field.  I 
do have quite a bit of paper on it, but nowhere can I find an specific 
mention of the specific _history_ of NDBs - simply the ability to 
receive and provide a direction to them.   I'm happy to share any info I 
have in the files.

          73,
- Mike  KC4TOS

On 7/27/2023 2:02 PM, Tom Brent wrote:
>
> 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.
>
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