>"Why the need for a rotating turret? "
Shortest lead lengths. This concept closely approximates a single coil plug-in
jack bar. B&W once made a similar device for PA output networks in the
pre-WWII era when just about every stage from oscillator to antenna used link
coupling and push-pull output stages. Images here:
http://amfone.net/Amforum/index.php?topic=28394.0
>"Wouldn't switching taps accomplish the same thing? Cliplead taps on the coil
>have been a staple of link coupled systems since the early days of ham radio,
>and it seems to me that one could locate the optimum taps for each band and
>then use relays to switch them."
Cliplead taps and rotary switches have been the staple as a matter of
convenience and cost. If a relay matrix can be created with short lead lengths
that do not introduce substantial loss across a wide matching range, then yes,
that may be a viable alternative. Physical layout is critically important to
minimize loss.
Paul, W9AC
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