[AMPS] Impedance of amplifiers

[Rich Measures]

>
>> €  For c. five years, the ARRL Handbook had the wrong Pi-L tank values - 
>> -  despite being repeatedly told about the problem.  .
>
>Is it easy to explain what is wrong about the values? 
>
€  The error was in C2,  Eventually it was fixed. 

>  > since 1995, the Handbook has had an inaccurate method of calculating RF
>> current in a DC blocking cap.  My guess is that it will remain there until
>> sometime around 2040.  .  
>
>What is the correct method?

€ Calculate  the difference between instantaneous anode potential at max. 
conduction and anode supply potential.  Divide by 2^0.5 to convert peak v 
to RMS v. .  Disconnect the C1 side of the blocking cap.  Measure 
anode-C. with tube in socket  Calculate capacitive-reactance in ohms.  
Current=volts/ohms.    

€  later, Tom


Rich...

R. L. Measures, 805-386-3734, AG6K, www.vcnet.com/measures  


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