[Amps] L-C-L vs C-L-C

[Larry Benko]

Ron,

There are 2 types of both networks (lowpass and highpass).

*C-L-C Pi* is a lowpass with the ability to ground one side of the 
capacitors
*L-C-L Pi* is a highpass with both sides of the capacitors hot
*C-L-C Tee* is a highpass with both sides of the capacitors hot and this 
is the common Tee tuner topology
*L-C-L Tee* is a lowpass with the ability to ground one side of the 
capacitor

Larry, W0QE

On 7/9/2015 9:26 PM, Ron Youvan wrote:
>> -----Original Message-----
>> From: Amps [mailto:amps-bounces at contesting.com] On Behalf Of
>> chris at chrishays.com
>> Sent: Thursday, July 09, 2015 6:54 PM
>> To: amps at contesting.com
>> Subject: [Amps] L-C-L vs C-L-C
>
>> Another reason I suspect is the C-L-C pi network allows both the 
>> variable
>> capacitor rotors to be at ground potential.  This lets the shaft be at
>> ground potential making for a safer control that is not affected by the
>> proximity of the human operator's hand. No insulated shaft required 
>> either!
>
>   I am having a lot of trouble visualizing a C-L-C (usually called a 
> "T" not a Pi)
> network where any part of either capacitor is grounded, please explain 
> more.
>