Fw: Re: [Antennas] WTD: Balanced Output Tuner Plans

2003年3月01日 01:25:19 +0000

Sandy and Kees Talen wrote:
> Interesting point. Keeping "good contact" is a major problem,
> though and that wire is pretty lossy..... 
>> Roller inductors cost money, are low Q (probably because of 
> roller resistance as it picks up "stuff" and the metal framework), 
> and they are high loss in the tuner if you use the ones with smaller
> wire, but they do allow the needed "infinite adjustability".
>> Tapped Inductors are high Q but the fixed taps are limited to 
> where you put them (hopefully to match YOUR antennas) and if 
> you loan it to a friend with different impedance antennas/
> transmission lines, he won't like it unless your taps are alligator
> clips). Moving alligator clips is a pain.
>> What we need is a variable, high Q inductor, using cheap stuff 
> like PVC.
>> Lets see ...this giant slug tuned coil using cheap cable toroids.
> ....just kidding.
>
A variometer has these properties
Stewart G3YSX