[AMPS] blocking cap current

[Rich Measures]

>
>
>> >Because we are interested in CURRENT through the blocking cap,  
>> >not current through the tube's capacitance, when we are selecting 
>> >a blocking cap.
>> 
>> Is this strictly correct, since we can see that a major part of the
>> current through the blocking cap at the higher frequencies is caused by
>> the current through the plate - ground capacity?
>
>Let's look at only 14pF total capacitance at the anode side of the 
>blocking cap, 3000 ohms load resistance at the anode end of the 
>tank, and 3000 volts RMS.
>
>Doing it the incorrect way Rich suggested, blocking cap currents 
>on ......28 MHz....:
>
>..... 7.39 amperes.
>
€  agreed, Tom.  Can you explain how the half cycle pulses of 
anode-current, supplied through the HV-RFC from the HV supply, are able 
to pass through the DC blocking capacitor? 
  
>Working the problem while considering the RF power transferred to 
>the tank (by simply adding the current responsible for output power 
>to his method) we get:
>
>....... 8.39 amperes.
>
€  This is not the answer one gets with the formula on page13-13 of the 
ARRL Handbook, Tom.
>.........


Rich...

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


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