[Amps] GS35B tuned input

Bill, W6WRT dezrat1242 at yahoo.com
Wed Feb 24 10:30:37 PST 2010


ORIGINAL MESSAGE:

On Tue, 23 Feb 2010 06:19:20 -0800, "Jim Thomson" <Jim.thom at telus.net>
wrote:

>###  a Pi net IS a LP filter.  Are you sure low Q promotes instability ??

REPLY:

I am sure in the case of a simple parallel resonant circuit. A pi-net,
I don't know. Have not tried one at high Q. 

An 8877 is an excellent candidate for a simple parallel resonant
circuit since its input impedance is very close to 50 ohms anyway.
Likewise for a pair of 3-500Zs. (115 ohms for a single, 57.5 for a
pair). 

73, Bill W6WRT


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