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Re: [Amps] IM distortion and such

To: Tom W8JI <>
Subject: Re: [Amps] IM distortion and such
From: R L Measures <>
Date: Fri, 30 Jun 2006 16:32:46 -0700
List-post: <>
On Jun 30, 2006, at 8:11 AM, Tom W8JI wrote:

>> So by you saying "almost", your saying it could happen?
> When we can't possibly know every circumstance in the world,
> never couldn't apply.
> Besides, VHF starts at 30 MHz. An oscillation at 30MHz in a
> tank resonant near ten meters could be a problem since it
> would pass right through the tank.

When grounded, a 3-500Z's grid resonates c. 88MHz.  At resonance and  
above resonance, the grid is semi-transparent.  As frequency  
decreases below resonance, the grid acts as a better and better  
shield between the anode-output and the cathode-input.  Thus,  
parasitic oscillations at 30MHz in a 3-500 seems unlikely.  The  
lowest frequency parasite that I have heard of in a 3-500 was c. 95MHz.

R L MEASURES, AG6K. 805-386-3734

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