>
>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, www.vcnet.com/measures.
end
--
FAQ on WWW: http://www.contesting.com/FAQ/amps
Submissions: amps@contesting.com
Administrative requests: amps-REQUEST@contesting.com
Problems: owner-amps@contesting.com
|