Tuesday, 31 July 2007

Antenna Work

The coax originally connecting the antenna (in its G5RV form) was removed long ago in favour of all balanced line. But, this unfortunatly puts the feeder/element combined lengths at a rather unfortunate multiple of 1/4wavelengths for my main bands, and so getting the thing to tune up well isnt easy, and on 40m the low SWR point is very sharp. Im going to add another 13ft of feed to hopefully bring the length away from the current wavelenth multiples that are creating the high impedance problems. The new feedline arrived today, and so hopefully i can get it patched in soon. Ive also constructed a coaxial balun that i will try in place of the ATUs internal toroid, which i dont have great faith in.

No comments: