|[AMRadio] Pi-Net vs Link Couple|
w5omr at satx.rr.com
Thu Sep 22 20:13:04 EDT 2005
Byron Lichtenwalner wrote:
> Don't have the tube characteristics here, but from your description
> your changing the operating point of the amp by changing L/C ration.
> Or the "transformer effect" (turns ratio of link to plate coil) gives
> a better match to the antenna)
> If you have a 1000 pf that will take the voltage, start there. If you
> loading to an untuned link, I bet you can load that thing like your
> using a bucket of bricks.
That's the idea, Byron - to use a capacitor in series with the output of
the link to the load (antenna).
I my case, it's a relativly short run (10 ~ 15' of RG-8) to the input of
a Heathkit 2060, which the open wire line output feeds 450 ohm ladder
line, that feeds a full-wave delta loop on 75m.
With the capacitor in series (someone else suggested an air variable
broadcast tuning cap out of an old receiver) I can tune the link to load
the final a bit heavier.
1000pF would probably be a good place to start.
73 = Best Regards,
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