[Amps] Tuner Loss

[Paul Christensen]

One advantage of the reversible "L" is that the tuning/matching function is 
generally optimized with one set of variables.  But care is needed in the 
switched reversing design to keep high coil Q across the HF spectrum.  Any 
benefit in the switched L design can be undermined by long lead lengths 
going to/from switching relays, for example.

Paul, W9AC

----- Original Message ----- 
From: "Bill, W6WRT" <dezrat1242 at yahoo.com>
To: <amps at contesting.com>
Sent: Monday, March 21, 2011 4:46 PM
Subject: Re: [Amps] Tuner Loss


> ORIGINAL MESSAGE:
>
> On Sat, 19 Mar 2011 11:22:15 -0700, Robert Harmon <k6uj at pacbell.net>
> wrote:
>
>> I guess it would be good to crank the rotary inductor down to
>>a minimum inductance and start from there ?
>
> REPLY:
>
> The way I do it is to set both caps to max, then adjust the inductor for
> a dip, however slight. Then adjust ONE of the caps for a greater dip and
> back and forth between that cap and the inductor for a 1:1 SWR. In
> almost all cases, ONE of the caps will still be at max when you are
> finished. That should almost always be the most efficient point.
>
> 73, Bill W6WRT
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