[Roger Gaemperle]

Hello,

I have a question to radar specialists:

In 1944 6 more frequencies for the FuG 220 were introduced in order to make jamming more difficult. The original frequency was IV, I-III and V-VII were added.

In Monogram Close-Up Bf 110 I read that the FuG 220 antenna were vertical only for the frequency IV, for all others the angle was 45 degrees.

In Motorbuchverlag, Trenkle, Bordfunkgeraete I read that the reason for the 45 degrees was, that for the lower frequencies the dipoles got so long that they would have touched each other. With this reasoning, the frequencies V to VII could have still used vertical dipoles.

However, 45 degrees antennas are also known for e.g. VI frequency. Therefore, I guess the real reason was that after 45 degree antennas were introduced for the lower frequencies they were also applied for the upper frequencies (maybe simplified production) and quite probably also for frequency IV (the original FuG 220 radar frequency).

Can anybody confirm that there were also FuG 220 with frequency IV with antennas arranged at 45 degrees?

Thanks!
Roger