[ICOM] Question about AT tuners.

[Adam Farson]

Hi Hart,

Here is an article which may be of help:

http://www.qsl.net/ab4oj/atu/autotuner.html 

In general, the AT-100, AT-150, AT-160, AT-180 and AT-500 will match loads
over an impedance range of 16 to 150 ohms resistive (VSWR < 3:1). In the
article, they are referred to as T-section autotuners. They are fitted with
a coaxial input and output.

The AH-2, AH-3, AH-4 and the AT-120/AT-130 marine HF tuners will match
random-length antennas such as mobile whips, long-wires, insulated backstays
etc. They will match over a very wide impedance and frequency range, but the
antenna must not be a half-wave or multiple thereof at any of the
frequencies in use. The article describes this class of tuner as a pi-L
coupler.

Cheers for now, 73,
Adam VA7OJ/AB4OJ


-----Original Message-----
From: icom-bounces at mailman.qth.net [mailto:icom-bounces at mailman.qth.net] On
Behalf Of Hart Engel
Sent: 18 December 2004 06:43
To: icom at mailman.qth.net
Subject: [ICOM] Question about AT tuners.

With all this talk about tuners, that begs me to ask a question on this
reflector.

I have been told that a lot of AT tuners "can't OR can" deal with high swr
antennas. Can anyone tell me the real scoop on this because I'm in the
market for one.

Hart


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