Try and obtain either a CIA or VNA and sweep complex Z between the frequency
extremes on both bands.
Next, you can use TLW software and find combinations of C and L for several
common tuners. Once you see the L and C extremes to obtain a match across the
two bands, you can then select these component values. Over these frequency
extremes you will likely exceed 2:1 SWR points and adding remote motors in a
sealed enclosure will work well.
To keep mechanics simple, I would first try an L network as only two controls
are needed. TLW lets you try high-pass and low-pass L networks. Hopefully,
component reversal won't be needed. But the only way to know for sure is to
first conduct the complex Z sweep measurement. Once you know that information,
TLW will take over, generally with very good accuracy.
Paul, W9AC
Sent from my iPhone5
>> On 2014-09-14 9:45 AM, Gary Marks wrote:
>> I have an Inverted-L antenna for 80M & 160M and would like to make or buy a
>> remote matching system that would work on both ends of both bands that would
>> accept full power.
>> I built a system many years ago from a Doug DeMaw, W1FB, article in the May
>> 1985 issue of QST but it has never worked as well as I wanted for whatever
>> reason.
>> If anyone is interested, this article can be found at the ARRL QST archives
>> http://www.arrl.org/arrl-periodicals-archive-search by entering W1FB ,
>> 1985, May, QST.
>>
>> Anyone have an idea of a matching system that would do all of the above ?
>> _______________________________________________
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