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

[Karl Kanalz]

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: antennas@mailman.qth.net
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

---
Outgoing mail is certified Virus Free.
Checked by AVG anti-virus system (http://www.grisoft.com).
Version: 6.0.368 / Virus Database: 204 - Release Date: 5/29/02