Electronics - Technological Advances

How Germany Lost the Radar Race in WW2 - Binkov > . skip ad > .

Why 17 Million Telegrams Are Still Sent Every Year - Half > . 
RDF, technology - tb >> .
The Mechanical Universe - caltech >> .

Wartime Radio The Secret Listeners BBC (1979) > .

https://www.youtube.com/watch?v=RwbzV2Jx5Qo .

BBC Wood Norton & Alexandra Park

Battle of the Beams
https://www.youtube.com/watch?v=Uf5caj9ZhpQ

Search by Date
http://www.radiogoldindex.com/frame1.html
August 24, 1939
http://www.radiogoldindex.com/cgi-local/p6.cgi?DateN=19390824;Date=August%20%20%20%2024,%201939

August 28, 1939
http://pastdaily.com/2015/08/28/eyeing-pigeons-with-suspicion-august-28-1939/
September 1, 1939
http://www.teletronic.co.uk/bbcclosedown.htm

HISTORY OF THE BBC: WAR AT THE PALACE
http://www.teletronic.co.uk/herestv7.htm

Alexandra Palace Television Society - periodicals
http://www.apts.org.uk/periodical.htm .

https://en.wikipedia.org/wiki/High-frequency_direction_finding
https://en.wikipedia.org/wiki/Robert_Watson-Watt
https://en.wikipedia.org/wiki/Arnold_Wilkins
https://en.wikipedia.org/wiki/Albert_Rowe_(physicist)
https://en.wikipedia.org/wiki/Committee_for_the_Scientific_Survey_of_Air_Defence
https://en.wikipedia.org/wiki/Henry_Tizard
https://en.wikipedia.org/wiki/Frederick_Lindemann,_1st_Viscount_Cherwell
https://en.wikipedia.org/wiki/Jane_Trefusis_Forbes

RDF ..

Radio
https://youtu.be/Jth70_zH-Ps?t=32m19s
BBC Home Service
https://en.wikipedia.org/wiki/BBC_World_Service#History

BBC - Bush House - Winter 1941 to Summer 2012
https://en.wikipedia.org/wiki/Bush_House

The Vacuum Tube In Radio - 1943
https://www.youtube.com/watch?v=SoMTPzYqqxA

HOW RADIO WORKS - 1943
https://www.youtube.com/watch?v=jqGAneO79lY

Electronics: Vacuum Tubes (Valves): Triode & Multipurpose Tubes ~ 1943 US Army Training Film TF1-471
https://www.youtube.com/watch?v=04sCi50B5CY

https://en.wikipedia.org/wiki/History_of_radio
https://en.wikipedia.org/wiki/Radio
http://www.personal.psu.edu/jtk187/art2/radio.htm
http://www.explainthatstuff.com/radio.html

Secret Life Of Machines - The Radio (Full Length) > .https://www.youtube.com/watch?v=2roG4jIjvEk
Secret Life Of Machines >> .
Wireless Telegraphy >> .

A regenerative circuit is one that employs an amount of positive feedback (which is also known as regeneration or regen), that is: part of the output is fed back to the input without phase inversion, to reinforce the signal. One example is the Schmitt trigger (which is also known as a regenerative comparator), but the most common use of the term is in RF amplifiers, and especially regenerative receivers, to increase the gain of a single stage - effectively allowing an electronic signal to be amplified many times by the same active device.
https://en.wikipedia.org/wiki/Regenerative_circuit

https://en.wikipedia.org/wiki/Superheterodyne_receiver

https://www.youtube.com/watch?v=Jth70_zH-Ps

The History of Radio documentary
https://www.youtube.com/watch?v=myVGKUui55M
Radio history documentaries - playlist
https://www.youtube.com/playlist?list=PLCCBg8Rr0T3Gk5eSn1i8QocWTxlYj9cUa

S-phone
https://youtu.be/xEbkxgDIGH0?t=47m8s
https://en.wikipedia.org/wiki/S-Phone . 

London's Old Phone Boxes > .

https://www.thegreatcoursesdaily.com/radio-television-history-of-electronic-communication/
https://www.thegreatcoursesdaily.com/who-invented-radio-astronomy-a-history-of-the-radio-telescope/