Auto balanced tuner

[David Andrews-3]

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)

 

_______________________________________________
Elecraft mailing list
Post to: [hidden email]
You must be a subscriber to post to the list.
Subscriber Info (Addr. Change, sub, unsub etc.):
 http://mailman.qth.net/mailman/listinfo/elecraft   

Help: http://mailman.qth.net/subscribers.htm
Elecraft web page: http://www.elecraft.com

[Vic K2VCO]

David Andrews wrote:
> 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?

Here's a really nice one:

<http://www.hamware.de/hardware/tuner502/descr-at502-e.pdf>

Get ready to sell your car and mortgage your home, however.
--
73,
Vic, K2VCO
Fresno CA
http://www.qsl.net/k2vco
_______________________________________________
Elecraft mailing list
Post to: [hidden email]
You must be a subscriber to post to the list.
Subscriber Info (Addr. Change, sub, unsub etc.):
 http://mailman.qth.net/mailman/listinfo/elecraft   

Help: http://mailman.qth.net/subscribers.htm
Elecraft web page: http://www.elecraft.com

[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" <[hidden email]>
To: <[hidden email]>
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)
>
>
>
> _______________________________________________
> Elecraft mailing list
> Post to: [hidden email]
> You must be a subscriber to post to the list.
> Subscriber Info (Addr. Change, sub, unsub etc.):
> http://mailman.qth.net/mailman/listinfo/elecraft
>
> Help: http://mailman.qth.net/subscribers.htm
> Elecraft web page: http://www.elecraft.com
>

_______________________________________________
Elecraft mailing list
Post to: [hidden email]
You must be a subscriber to post to the list.
Subscriber Info (Addr. Change, sub, unsub etc.):
 http://mailman.qth.net/mailman/listinfo/elecraft   

Help: http://mailman.qth.net/subscribers.htm
Elecraft web page: http://www.elecraft.com

[Stewart Baker]

I made a carbon copy of this ATU. It works pretty well, however at
impedance extremes it was a bit lossy.

73
Stewart G3RXQ
On Wed, 20 Aug 2008 09:12:01 -0700, Vic K2VCO wrote:
> David Andrews wrote:
>> 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?
>>
> Here's a really nice one:
>
> <http://www.hamware.de/hardware/tuner502/descr-at502-e.pdf>
>
> Get ready to sell your car and mortgage your home, however.


_______________________________________________
Elecraft mailing list
Post to: [hidden email]
You must be a subscriber to post to the list.
Subscriber Info (Addr. Change, sub, unsub etc.):
 http://mailman.qth.net/mailman/listinfo/elecraft

Help: http://mailman.qth.net/subscribers.htm
Elecraft web page: http://www.elecraft.com

[AC7AC]

CONTENTS DELETED

The author has deleted this message.