[Top] [All Lists]

[AMPS] FT100D driving Alpha 87a

To: <>
Subject: [AMPS] FT100D driving Alpha 87a
From: (2)
Date: Thu, 26 Jul 2001 18:50:28 -0700
>The 87a should shut off if you over-dive it. Let the amplifier safety
>circuits take care of the problem.
>Although and ALC circuit just in case is a good idea. I would not rely on it
>for everyday use. It most likely result in splattering.
/\  amen, Jim
>----- Original Message -----
>From: "Curt Terwilliger" <>
>To: <>
>Sent: Thursday, July 26, 2001 6:00 PM
>Subject: [AMPS] FT100D driving Alpha 87a
>> 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
>> 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
>> to reduce the power in the same manner as turning down the drive control
>> 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
>> 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
>> to take my chances with the reliability of an active circuit.
>> I was wondering what others think about this DC ALC approach, and if
>> is currently using it?
>> Tnx es 73,
>> Curt W6XJ
>> _________________________________________________________________
>> Get your FREE download of MSN Explorer at
>> --
>> FAQ on WWW:     
>> Submissions:    
>> Administrative requests:
>> Problems:       
>FAQ on WWW:     
>Administrative requests:

-  R. L. Measures, 805.386.3734,AG6K,  

FAQ on WWW:     
Administrative requests:

<Prev in Thread] Current Thread [Next in Thread>