I did that on my 630m inverted-L. Obviously 43-feet vertical is very
short on 495-KHz (less than 10% of a quarter wave), so the antenna is
heavily base loaded by a coil plus the 122-foot top section adds a
little capacity. I ran three wires in parallel spaced a foot apart
in the vertical section tied together at both ends with 1/2 inch
copper tube and the top hat is two parallel wires space 2-foot with
another 1/2 inch copper tube at the far end. This lowered the Q
enough to get SWR<2.0 over 5-KHz bandwidth.
I will have to retune to 472-479 KHz when I hang the antenna back up
after repairs as this is the proposed frequencies for a future ham band.
I operate with 100w (1.3w ERP) under the call sign WD2XSH-45 (ARRL
sponsored Experimental License).
73, Ed - KL7UW
http://www.kl7uw.com
Dubus-NA Business mail:
[email protected]
______________________________________________________________
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:[email protected]
This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
Message delivered to [email protected]
