>> >For example, I can use a MFJ-259 Antenna analyzer (or the new
>> >MFJ Antenna Analyzer that measures R and X, return loss, reflection
>> >angle, and other parameters) or any other signal source to excite the
>> >cathode (or anode)
>>
>> Tom,
>>
>>The small signal level present on one of these instruments will do
><snip>
>> or such with a small signal but certainly not in AB or B where the
>> driving signal effectively biases the tube.
>
>I might not have been clear enough Jon. I specifically stated the
>function of the device was to supply a signal source, and that is
>all.
>
>I believe I specifically stated you had to use a detector to measure
>transmission loss through the tube, and that the system was
>"cold". '
>
>You are talking about something entirely different.
Perhaps I misunderstood you, Tom. It sounded like you were saying that
you could use one of the MFJ analyzers to measure the input return loss
and reflection angle of a tube. And I am saying that one of these
devices does not have enough signal to properly excite the tube into the
large signal operational area.
If you and I are talking about two different things, OK. And I don't see
the benefit of measuring insertion loss through a cold tube. Please
explain.
73,
Jon
KE9NA
-------------------------------------
Jon Ogden
KE9NA
http://www.qsl.net/ke9na
"A life lived in fear is a life half lived."
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