[Elecraft] KAT100 question
Vic Rosenthal
[email protected]
Tue Nov 26 16:44:00 2002
Peter Halpin wrote:
> You will be OK with a 1/4w antenna, but a 1/2w is VERY high impedance: more
> than a few k_Ohms. The way to go here would be to make the wire about 5%
> longer than a true 1/2w, but you'd still have a lot of loss on the coax: too
> much to be acceptable.
> One way to get around this problem is to use a 9:1 (or even a 16:1)
> impedance transformer (aka UNUN) and use it at the end of your coax to feed
> a wire that's around 75' long. It's an old trick, and works a treat. The
> transformer ensures that your SWR on the line is never more than 3:1 - quite
> an acceptable level.
Remember, I'm trying to get this to work on 80 and 160 meters. Wouldn't a 75'
wire have a very low radiation resistance and high capacitive reactance on 160?
Vic K2VCO