[AMPS] Practical PI Nets

[measures]

>In a message dated 5/2/00 9:00:59 AM Eastern Daylight Time, 2@vc.net writes:
>>  
>>  >
>>  >One not too expensive device is the Almost All Digital Electronics L-C
>>  >meter. It's cheap, pretty accurate, and comes as a kit that took me under 
>> an
>>  >hour to build. It is worth changing the 5 volt regulator to a low drop out
>>  >type, though, as you get a lot more effective battery life.
>>  >
>>  >Of course, it doesn't measure at the operating frequency, 
>>  
>>  The apparent resonant frequency of two L networks in series is not the 
>>  operating frequency.  
>>  
>>  cheers, Peter
>>  
>>  -  Rich..., 805.386.3734, www.vcnet.com/measures.  
>>  end
>>  
>--------------------------------------------------------------------------
>----
>-
>Rich,
>
>Could you give an approximation to guesstimate the difference in the 
>apparent 
>measured frequency and the operating frequency?  

As I recall, on 80m the difference is typically hundreds of kilohertz, 
with the resonance of the tank being lower than the operating frequency 
where the tank was adjusted.  

> Or what factors determine 
>the difference ?
>
The biggest factor is Q.  The higher the Q, the less the difference.  

later, Dave

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


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