[Amps] Parasitic Oscillations in RF Amplifiers

[rlm]

>> **  A dipmeter shows that a directly-grounded 3-500Z grid is not grounded
>> throughout the VHF range.
>
>Making a measurement that is meaningless won't help much.
>
>A dip meter does not tell you impedance. It will dip where impedance is
>minimum, or maximum, depending on the system being tested.
>
A dipmeter dips when capacitive reactance equals inductive reactance.  

>The only correct way to measure shielding of the grid, or impedance of the
>grid structure to ground is by measuring the anode-to-cathode feedthrough or
>transmission loss. Otherwise, you could be measuring almost anything.
>
>73 Tom
>
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>


-  R. L. Measures, a.k.a. Rich..., 805.386.3734, AG6K, 
www.vcnet.com/measures.  
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