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[AMPS] FT100D driving Alpha 87a

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Subject: [AMPS] FT100D driving Alpha 87a
From: (2)
Date: Thu, 26 Jul 2001 18:50:25 -0700
>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.

/\  100w?  The average duty-cycle of SSB is 15% during transmit.  

good luck, Curt

-  R. L. Measures, 805.386.3734,AG6K,  

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