Andrew and Geoffrey both mention Keen's books. For anyone interested in Loop Antennas Ronald Keen's books are very interesting, there are three titles but updated versions can have more data! :-
- Direction and position finding by wireless 1922
- Wireless direction finding and directional reception 1927
- Wireless direction finding 1938 (revised 1947)
They all contain a lot of material which may be new to many people, some ideas long forgotten and a great deal of material? which is now called by different names.
In the 1938 edition you can find the Low Noise Vertical (before it was re- invented recently) , Twin crossed in-line loops and spaced loops ( now largely forgotten). You can also see the origins of E-Field active antennas which were used as the sense antenna ( using a valve amplifier).
The 1938 version can be found on-line. One problem is that the Ronald is miss-spelt by? ?to become? Donald, Roland and now Richard!
The last edition of 1947 included WW2 developments including Huff-Duff which was a CRT displayed automatic HF DF which played a very important role in defeating U-Boats. One of my fave tech books.
Regards, Alan G8LCO
