A few more questions for the experts

[mark@1C]

I can do nothing else,but a Google searching,may it help you.
and this time I will focus my searching on Radio Navigation and so on.
I"m not sure what's your meaning of "quick".If it's not in a very hurry.I can do searching like this every time I've got some leisure.
and maybe you can put some Information Requests to us(all your fans) once a week,for example.I believe it's a pleasure for many fans to help you.

some results from Google about Radio matter,

http://en.wikipedia.org/wiki/Battle_of_the_Beams
http://en.wikipedia.org/wiki/List_of...fare_equipment
http://www.taphilo.com/history/WWII/...vigation.shtml
http://en.wikipedia.org/wiki/GEE_(navigation)
http://www.vectorsite.net/ttwiz.html
http://www.cvni.net/radio/nsnl/nsnl1...l124ww2de.html
http://www.carc.org.uk/html/archive2.html
http://www.xs4all.nl/~aobauer/knickebein_fug28a.htm
http://www.486th.org/Photos/AC2/MkySet.htm
http://www.spitfirespares.com/Spitfi...adio%202l.html
http://elshamwolds.50g.com/cologne1942.html
http://www.pdf-search-engine.com/avi...stems-pdf.html
http://en.wikipedia.org/wiki/Oboe_(navigation)
http://www.xs4all.nl/~aobauer/Navigati.pdf
http://s110605900.websitehome.co.uk/...eam-main-a.htm