> For many of us overdriving means splattering or driving the amp into
> nonlinearity.
>I don't think the safety circuits will prevent that.
>73
>Bill wa4lav
>
>
>At 06:42 PM 7/26/01 -0700, you wrote:
>
>>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.
>>
>>
>>
>>73 and good luck
>>Jim W7RY
>>
>>
>>
>>----- Original Message -----
>>From: "Curt Terwilliger" <ki6j@hotmail.com>
>>To: <amps@contesting.com>
>>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
>>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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>> >
>> >
>> > --
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>> >
>>
>>
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