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[AMPS] FT100D driving Alpha 87a

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Subject: [AMPS] FT100D driving Alpha 87a
From: (Patrick)
Date: Sun, 29 Jul 2001 22:19:52 GMT
  I remember this being addressed one time on a newsgroup in relation
to driving a transverter. There was a pin on one of the back
connectors that could have power placed on it to vary the output
power. I checked around on the Net and could not find where this
information is located. You might can check a tech manual on the
FT-1000D and see if the info is there. I'll keep looking around and
see if I run back across the info.


On Thu, 26 Jul 2001 18:00:06 -0700, you wrote:

>I am using an FT1000D to drive an Alpha 87a, and am thinking of building a 
>"DC ALC" circuit to throttle back the juice to 60-80W out whenever the amp 
>is in "Operate" mode (because otherwise one day in the heat of battle I will 
>forget to reduce the drive power manually and probably cook the 3CX800s).
>This would not be RF derived ALC, just a DC voltage applied in steady state 
>to reduce the power in the same manner as turning down the drive control on 
>the front panel.
>AG6K, to whom I earlier mentioned this plan, has observed that using 
>suitable cathode resistors might be a more simple and reliable way to allow 
>the Alpha to accept a full 200W of drive. Point taken, although I am not 
>keen on adding 100W of dissipation to the cathode compartment and am willing 
>to take my chances with the reliability of an active circuit.
>I was wondering what others think about this DC ALC approach, and if anyone 
>is currently using it?
>Tnx es 73,
>Curt W6XJ
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