On Friday 12 December 2003 01:04, David Smith wrote:
> I'm building an 8877 amp for 2m - K1AGB grounded-grid stripline design -
> and I'm having problems with the proposed input matching circuit (which is
> the same as for the more popular W6PO design).
>
> The original circuit uses a T type match with a blocking cap and variable
> inductor with a "white slug" in series with the input, then a variable cap
> to ground, then a fixed inductance to the cathode of the 8877. I can't
> find a source for the variable inductor, so I wonder if anyone can suggest
> alternatives?
Wind an airspaced coil of similar size, and manually squeeze/stretch it (and
the second L) until you get a match that tunes nicely with the variable C.
Rewind for more/less L as you find necessary.
Steve
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