Differential tuners like the MFJ-986 have some positives and some negatives.
The biggest complaint I heard (I worked in a store that sold them) was that
they wouldn't tune a (insert just about any antenna here). A standard T or Pi
tuner would and the differential won't. With a differential there is usually
only ONE tune combination while a T or Pi has from a few to many combinations
that will show a low SWR. Finding the only combination is sometimes difficult.
The problem with a T or Pi is that only one of the possible tune combinations
is the most efficient one, while with the differential if you get one, it is
the most efficient. I spent some time with a MFJ-259 and charted where mine
would tune and then I had trouble with the Roller Inductor counter slipping
making getting back to the correct setting impossible. The concept was good
but the execution was poor.
Clint - W5CPT
----- Original Message -----
From: kd4e
To: towertalk@contesting.com
Sent: Tuesday, November 07, 2006 9:33 PM
Subject: [TowerTalk] Differential Tuner - Good Idea?
Can someone explain the plusses and minuses
of the differential tuner design for HF?
More of them are showing up and I have read
the market hype but not read a good discussion
of strengths and weaknesses.
--
Thanks! & 73,
doc, KD4E
... somewhere in FL
URL: bibleseven (dot) com
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