[ARC5] Flying the Beams

[zakariya.abu at yandex.com]

Bob,

This is indeed a very interesting and well known site by the 
enthusiasts. By the way, the LF 200-400 kHz nav system allowed the use 
of ordinary radios. In the late 1930s/1940s even dedicated sets like 
Motorola Airboy and Airboy Sr.; Mitchell Airboy Sr., and RCA AVR-15A 
were manufactured among others for the purpose. During WW II the Detrola 
Mod. 438 and Setchell-Carlson Model 524, both known in the military as 
BC-1206B and BC-1206C, were present on many US-made aircraft, especially 
during ferry flights.

I would like to consult with the members if the "most sophisticated" 
receiver for the LF nav system was the Aircraft Radio Corp. R-11A LF 
receiver + L-10A loop antenna + C-48 control unit with Dzus mounting, 
which belonged to the Aircraft Radio Corp. Type 12 family? This set used 
the loop antenna, as well, which offered more possibilities. An example 
of this control unit can be viewed here:

https://www.si.edu/object/control-unit-radio-compass-arc-12-c-48:nasm_A19840570000

I wonder if the loop antenna of the above mentioned set was effective in 
the 200-400 kHz range.

Does anyone have the original LF beacons maps, which covered Latin and 
South America, Europe, Africa and Asia/Pacific other that the one based 
on google maps that is available at flyingthebeams.com? I only have the 
US LF beacons' map as attached.

73

Jan SP5XZG


W dniu 21.03.2024 o 02:02, Robert Nickels pisze:
> Since I know many here are also interested in aviation and radio 
> navigation, I wanted to share an excellent new website:
> 
> https://flyingthebeams.com/
> 
> The creator,  Doug Davis, has done an exceptionally good job of 
> explaining not only the Low Frequency Radio Range (LFR) but the 
> evolution of airborne navigation to the present day, with many 
> illustrations and photos that I haven't seen elsewhere.   To his 
> credit,  he has also preauthorized the use of material from this site 
> for educational purposes,  as long as it is unaltered and attribution is 
> given.     An enormous amount of effort has been put into researching 
> and developing this site.
> 
> To my surprise he was able to find actual audio clips of the LFR in 
> operation, which I didn't know even existed!   There are also on-site 
> photos of the few remaining intact radio range sites that I've only been 
> able to view via Google Maps. In addition to navigation, the "Early 
> Radio Tech" page provides a great summary of the development of radio 
> with high quality graphical illustrations.
> 
> A terrific resource for anyone interested in the topic.
> 
> 73, Bob W9RAN
> 
> 
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