[TenTec] swr

[Dr. Gerald N. Johnson]

You could always try a Hygain AV-6110 for $250 bucks.

Grabbing my handy Lightning Calculator copyright 1932, I see my coil 
would be about 300 microhenries and the few on line references about 
such a loading coil tend to show 42 to 70 microhenries. Where my coil 
would be 6" diameter and 4" long with 12 turns to the inch, a 50 
microhenry coil would be 3" long, 2-1/2" diameter and 12 turns to the 
inch. And if it wasn't enough inductance for resonance, it would still 
definitely improve the load Z for the tuner.

73, Jerry, K0CQ

On 8/15/2010 9:54 PM, Ken Brown wrote:
>
>>   Fundamentally the 43 foot
>> vertical is way too short for 160 and needs a BIG loading coil
>> containing about 77 feet of wire, and forcing that to be done in the
>> tuner will tend to smoke the tuner.
>>
> You are correct that a 43 foot radiator is way to short to be resonant
> on 160 meters, and either an added length of wire or an  inductance can
> compensate for the capacitive reactance to make it a non-reactive,
> resonant  load. I do not think that you are correct to say that a
> loading coil would require 77 feet of wire to provide the necessary
> inductive reactance. Because of the coupling (mutual inductance) of the
> multiple turns of the coil, the necessary inductive reactance will be
> had with less than 77 feet of wire. If it is not wrapped into a coil,
> then 77 feet would be about what you would need.
>
> DE N6KB
>
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