Again: Can I put a variable condenser in series with the inductor in a pi
network to get a variable inductance? An old WRL GALAXY with a large number
of parallellt sweep tubes used this methode. If possible, how do I calculate
voltage rating of the condenser?
----------
>Från: "Roy Koeppe" <royanjoy@ncn.net>
>Till: "Amps Reflector" <amps@contesting.com>
>Ämne: [AMPS] Re: Elementary question...(Shame)
>Datum: tis 2 nov 1999 21.18
>
>
>Phil, thanks for the following:
>
>"A roller coil gives the advantage of being able to tune the tank
>for maximum efficiency at any power setting and frees one from many
>hours of tapping a fixed coil in place in a new amp.
>
>It is very simple; you tune the tank circuit for maximum power output.
>With a roller coil, you just have one more item to tune.
>
>Antenna tuners with roller coils work the same way. A tapped coil
>may not be close enough to give a perfect match in every case."
>
>(((73)))
>Phil, K5PC
>
>BUT,
>
>Couldn't (wouldn't) maximum output likely correspond to a rather low-Q
>setting of L1, rather than the usual 10 or 12? With a high L to C ratio
>in the pi-net, efficiency is improved at the expense of harmonic
>attenuation (low, loaded tank Q).
>
>So, it seems to me, just tuning all three components for maximum, full
>bore output, could end a person up with an undesireable loaded Q tank
>situation.
>
>Other comments please. (My danged ISP dumped all my e-mail, so I had to
>retrieve the responses from the archives after I realized what had
>happened--and the ISP admitted to it--sorry for the delay).
>
>73, Roy K6XK Iowa
>
>
>
>
>--
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>
>
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