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[AMPS] Practical PI Nets

To: <amps@contesting.com>
Subject: [AMPS] Practical PI Nets
From: 2@vc.net (measures)
Date: Mon, 1 May 2000 03:33:50 -0700
>
>In a message dated 4/30/00 7:18:43 PM Eastern Daylight Time, 
>n2bc@stny.rr.com 
>writes:
>
>> 
>>  I do have an Autek RF-1 analyzer.  Would a useful approach be to provide 
>the
>>  desired plate load via a resistor, approximate the values of C1 and C2, 
>then
>>  adjust L1 and L2 for 50 ohms at the output measured by the RF-1?
>>  
>>  Any other real world approaches (sans fancy instruments) ?
>>  
>>  THX,  Bill  N2BC
>>  
>>  
>--------------------------------------------------------------------------
>----
>--------------------------------------
>
>Bill,
>
>I am currently doing the same thing with a Pi-L tank.  I use a carbon 
>resistor of the proper value to simulate the anode impedance.  I use a 
>capacitance meter to set the proper values of capacitance for Ct & Cload and 
>drive the tank output with my MFJ SWR Antenna Analyzer, using the frequency 
>meter and SWR bridge to determine the resonant frequency of the tank.  

?  A Pi-network is two L networks in series.  An L network can be 
resonant near the operating frequency but it can never be resonant on the 
operating frequency.  

cheers

-  Rich..., 805.386.3734, www.vcnet.com/measures.  
end


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