[Antennas] Log Periodic

2002年5月23日 14:33:04 -0400

I have a KMA-1330 HF Log Periodic 18 ft boom 8 element (13 to 30 mhz) =
- love the antenna it does a good job... The antenna uses a twin boom =
separated from each other by insulated material. One boom is the center =
of the coax the other boom the shield - feed through a bead balun.=20
I Have been told (instruction book states this) and convention dictates =
that the feed point (front of the Log) should not allow that the shield =
touch ground. The entire antenna is isolated from the mast by the =
insulated material also. Where along the feed line is it ok to ground =
the shield - a few feet, 10 20 100 etc feet - it is now grounded at a =
remote switch box at the base of a 75 foot tower. I have had the Log in =
the air for about 2 years, and it works well, but have always wondered =
about the grounding of the shield of the coax.
Thanks
Myles W1IKO
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