[Amps] I answered it.

Ron Youvan ka4inm at tampabay.rr.com
Sat Jan 29 05:36:09 PST 2011


Hi  Steve Cook:

> The question I watching for an answer to was:
> I the Q changes (because the tank L is set to a non optimal inductance
> value) what happens to the voltages across the plate tune and antenna
> loading capacitors.
> The original question, as I read it, did not address open antenna
> connections or the like.
> So for me, if I want to operate on 10MHz with my Kenwood TL-922 amp
> which does not have a setting for 10MHz -- do I need to operate at
> reduced voltage to keep the tank voltages from soaring?
> Did I get the question wrong?
> I still don't know what the answer is.
> What happens to the tank voltages when the Q goes up or down due to the
> setting of the tank inductance???

   A well asked question.  I didn't recall the original question.
First we are allowed only 200 Watts, so 3dB over a 100 Watt transceiver will not be noticeable.  If 
the "tank" is not resonant the efficiency will be extremely low, if the transformer ratio is 
incorrect (the two capacitors form a auto-transformer) because of the incorrect inductance the 
loading will be too high or too low, depending.  The "plate tune" capacitor can easily arc at the 
capacitor, it is unlikely that the "loading capacitor" would arc as the load will remain across it.
BTW:  Wikipedia says "CW only" and the ARRL says "RTTY and data" ??? and it is only good for 
contacts within USA, so I see no use for using it without some special interest.
-- 
    Ron  KA4INM - If you have any criticism for me constructive or otherwise
                  keep it to yourself, at my age I just don't care anymore.


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