[Elecraft] Re: may have it wrong

[N2EY at aol.com]

In a message dated 6/17/05 2:12:37 AM Eastern Daylight Time, 
rondec at easystreet.com writes:


> Wayne N6KR wrote:
> 
> "...what you 
> described won't work very well, because both wires need to be about 33 
> feet long at this frequency. By cutting one 33-foot piece of wire in 
> half, you've made a 20-meter antenna  :)"
> 
> --------------------
> 
> A modeling program like EZNEC predicts that a 33-foot center fed wire will
> show a gain of about 6.9 dbi on 7 MHz and about 7.1 dBi on 14 MHz. That's
> essentially no difference at all. 

> 
> Of course, that assumes no difference in matching network losses, which I'd
> not expect a KX1 user to see using such an antenna without a feed line. (Of
> course, if a coaxial feeder is used, then some means to holding down the SWR
> on the feedline is very important to avoid losses there.)  
> 
> 

There's more to it, though:

On 40 meters, the feedpoint impedance will look like a resistance of a few 
ohms and a reactance of several hundred ohms or more. Will the matching network 
be able to handle that, and do it without undue loss? 

73 de Jim, N2EY