[Elecraft] ATU - Internal Tuner

[crmabbott at comcast.net]

Just a thought I have always heard the tuner at the feed point of the antenna defined [SGC] as a coupler.  Because it is making a tank circuit at the feed point of the antenna.    Now the 'Tuner' when it works takes in both the antenna and the coax as what it sees as the load.  The coupler has some trouble tuning if in fact it is far from antenna. I have also heard the coupler is better than tuner and tuner is better than the coupler,  but no matter for this discussion.

If the radio has an internal tuner and the output of radio is feeding a coupler at the feed point of antenna isn't the system going to be a little odd trying to adjust for each other?  I would think you need a reliable way to lock either one of them out and let signal do a pass through.

Just my thoughts..

73
Chuck  AA8VS




Date: Sun, 26 Oct 2008 16:49:31 -0600
From: Dale Putnam <daleputnam at hotmail.com>
Subject: RE: [Elecraft] ATU vs. External Tuner
To: Sandy <ebjr37 at charter.net>, John Buck <kh7t at arrl.net>, Frank
MacDonell <kd8fip at gmail.com>
Cc: Elecraft <elecraft at mailman.qth.net>
Message-ID: <BLU107-W445A2C13E6505A66BC2189D0250 at phx.gbl>
Content-Type: text/plain; charset="iso-8859-1"


The balanced antenna, center fed, with balanced line, is the lower loss system 
of many. The fun part... is that while looking for inexpensive feedline, I've 
found that the "poor, fast replaced" speaker lead wire... you know the stuff, 
clear, copper, and only two conductors, work out very nicely for an antenna. In fact... a broad banded, dipole can be fashioned out of that wire, with the 
two elements having the ends twisted together, and still using just one run of 
the wire for feed, works right nice. The balanced line feeds through walls and 
up past the insulation nicely too. And the T-1 tunes it real nice. --... 
...--Dale - WC7S in Wy
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