[Antennas] Icom AH-4 Tuner To a Resonated Whip???

Wed Mar 2 02:53:57 EST 2005

 Hi Dave,
An end-fed 1/2-wave monopole presents a very high feed-point impedance,
which is the limiting case for the matching network in the AH-4.
Theoretically, this radiator is equivalent to an open circuit, which the
network cannot match. The AH-4 manual describes a half-wave, or multiple
thereof, as an "undesirable antenna length".
Here is another link to the manual:
http://www.icomamerica.com/support/manuals/ah-4.pdf
Cheers for now, 73,
Adam VA7OJ/AB4OJ
-----Original Message-----
From: antennas-bounces at mailman.qth.net
[mailto:antennas-bounces at mailman.qth.net] On Behalf Of DavidE Benedict
Sent: 01 March 2005 23:18
To: antennas at mailman.qth.net
Subject: [Antennas] Icom AH-4 Tuner To a Resonated Whip???
Hi Dave,
The AH-4 should tune a 50 to 75 ohm resistive load. How do you intend
feeding the antenna from the tuner? The AH-4 will not match a half-wave
monopole (e.g. a half-wave wire) worked against ground.
You can download the manual here:
http://www.icom.co.jp/manual/external/transceivers/AH-4.pdf
Cheers for now, 73,
Adam VA7OJ/AB4OJ
Hi Adam,... Thanks for the reply.
I think that the AH-4 can work most any length wire against ground...why not
a 1/2 wave monopole?
David
w7dbh
NW Oregon
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