[TenTec] 422 HF Amp Input Low Pass Filter Board question
W4EF at dellroy.com
Wed Feb 25 14:04:53 PST 2009
Jim Brown K9YC wrote:
>On Wed, 25 Feb 2009 02:01:59 +0000, K0BX wrote:
>>My Question is - Should I just order a new board from TT?
>Sure -- provide some stimulus to the economy! That's the only good
>reason to do it. Every Ten Tec amp I've ever seen will get to full
>power (or close to it) with less than 50W drive, and I typically run
>at about 30 watts. The only reason to worry about an SWR indication
>on the amp input is if the transceiver is folding back to protect
>itself, and it certainly should not at that relatively tame SWR.
The Centurion is a pair of 3-500Z running in zero-bias mode (something
like 2500Vdc on the plates), so the power gain is much lower than the
Titan amps with the 3CX800s. Driving the Centurion is more or less like
driving a Drake L-7 or an SB-220. You typically need on order of 100 to
120 watts to get "full power" which is typically around 1200 watts (a
little more if you have a stiff main and lots of drive power).
That said, I still agree that the less than perfect input VSWR shouldn't
be an issue for most exciters.
73, Mike W4EF.....................
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