08-06-2020, 10:13 PM
(25-09-2015, 07:11 PM)colly0410 Wrote: I'm trying to think what would have been the nearest British mainland TX to the Channel Islands during the war & how strong it would it have been there. Start point would have been the closest but closed down for normal service in 1939. However it started transmitting experimental horizontal polarised transmissions, I wonder if these would have been picked up well on horizontal long wire type aerials used with crystal sets?
Been reading about why the BBC used horizontal polarised medium wave transmissions in WW2: In On Air a History of BBC Transmission on WorldRadioHistory.Com website (used to be American Radio History).... It was to try & prevent the Luftwaffe from using them for direction finding. It said they would not be received so good in the far field as if vertical polarisation was used, but that was outweighed by planes not being able to to direction find them. HP was used for Droitwich & Start Point..... I'm trying to think of why they couldn't be DF'd? Was it that the frame aerials used for DFing were vertical polarisation & wouldn't work with HP? Or am I barking up the wrong TX mast?
