[Elecraft] Auto balanced tuner

[Don Ehrlich]

I have done it using motorized matched roller inductors and capacitor 
controlled by a PIC.  It is built into an old Tempo-1 cabinet and works 
great at over 500 watts (limited by my little amp).  It is in constant 
communication with my K3 and auto-tunes from memory as bands or frequency is 
changed.
I have not yet uploaded any pictures of this tuner to my web page but if 
anybody is curious then I could do so.

What power level are you running?  Below a hundred watts or so you can use 
relays to switch in pairs of inductors and / or a range of capacitors.  I 
have done that also and it is a much faster tuning system and mechanically 
more simple .. but it is also a lot more fragile.

Don K7FJ



T
----- Original Message ----- 
From: "David Andrews" <david at violinman.co.uk>
To: <elecraft at mailman.qth.net>
Sent: Wednesday, August 20, 2008 6:27 AM
Subject: [Elecraft] Auto balanced tuner


> I'm using a h/b 1930's link (balanced) tuner. It's as efficient as I can
> get, and open wire feeders closely balanced. What I'd really like is the
> same automated, either using motorised variable caps or switched
> caps/inductance. Has anyone any links or have they managed it themselves?
>
>
>
> David G4CWB (K3)
>
>
>
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