R L Measures wrote:
>> But that resonance belongs to the whole circuit, involving the
>> anode and
>> cathode and all their associated components. There are too many
>> unknowns
>> in that loop to understand what the frequency of the observed dip
>> might
>> be telling us about reverse feed-through from the anode back to the
>> cathode.
>
>It tells me that the grounded grid is no longer acting as a perfectly
>wondrous shield between the anode and the cathode.
Sorry, wondrousness is not a valid SI unit. I thought the intention of a
measurement was to quantify something.
>>> I must admit that I've never had a lot of use for GDO
>>
>> Me neither, because it's so difficult to understand what a dip
>> actually
>> means, except in the very simplest cases.
>
>The dip means that the entire circuit has a resonance at that
>frequency.
>>
>> The GDO is deceptively simple instrument. The trick is to tell when it
>> stops being simple, and starts being deceptive.
>
>Can a dipmeter indicate resonance when there is none?
Probably not - but the instrument never tells you what that dip MEANS,
and with a dipmeter the interpretation is always open to question.
--
73 from Ian GM3SEK
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