[Antennas] Re: Your Antenna "pre-selector" Desires....

Thu, 30 May 2002 11:03:25 -0500

Well that was my line of thinking in general. If I was to build a selectable
inductor and put it inline then I could try to use it to bring the SWR into
a more reasonable range and then kick in the autotuner to take up the slack,
therefore I am not stressing the TS-570 as bad.

----- Original Message -----
From: "Karl Kanalz" <[email protected]>
To: "Tim Billingsley" <[email protected]>; <[email protected]>
Cc: "Joe Giacobello, K2XX" <[email protected]>
Sent: Friday, May 31, 2002 10:53 AM
Subject: Your Antenna "pre-selector" Desires....

> The "built-in" antenna tuner in your rig (the FT570), isn't *really* a
> "tuner" (per se), but more of a "line flattener", Tim.... Usually, those
> built-in "tuners" can only handle a 3:1 VSWR (not a wide range at all !).
>
> As a reader suggested to you, "All that is required is an L-match, which
is
> made...."  You can adjust the L-network by taking  your "auto-tune"
off-line
> (in other words, you aren't using the built-in tuner) and looking at the
> VSWR of the antenna system and then adjusting the L-C network for minimum
> VSWR (looking toward the at-tenna system).  *THEN* re-enable the auto-tune
> function on your FT-570, looking into the L-Network/Antenna System.
>
> Karl K - W8TIF
> McKinney, Texas
>
> -----Original Message-----
> From: Tim Billingsley
> Sent: Friday, May 31, 2002 9:43 AM
> To: [email protected]
> Cc: Joe Giacobello, K2XX
> Subject: Re: [Antennas] Antenna "pre-selector"
>
> "All that is required ... is an L-match, which is made from an inductor
and
> a variable capacitor."
>
> Would the same be applicable in my situation?
> I have a 570 with autotuner and I am looking for a way to get a better
match
> before I hit the autotune.
> As I understand it the 570 tuner has a problem with higher mismatches and
it
> can be detrimental to its health in the long run.
>
> Tim Billingsley KD5CKP
>
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