[Amps] Fwd: Pi-L In-circuit Adjustment Question
TexasRF@aol.com
TexasRF at aol.com
Sun Feb 20 21:35:40 EST 2005
Hi Rich, no, I said "C1 resonates the network" but no matter, we both know
what the intent was.
While driving up to my eme operating QTH this morning I was thinking about
the subject and came to an interesting conclusion: there is no practical way to
couple a grid dip meter into network to look for a dip while the amplifier
is running key down to produce the needed impedance represented by the plate
load impedance calculation. The rf signal present will QRM the heck out of the
dip meter!
Then the thought; removing the rf enclosure lid to make the measurement
makes the L and the C change. The only way to get an accurate measurement is to
build a remotely operated dip meter into the circuit. This seems like a lot
of bother knowing that QRM will negate the reading anyway.
Therefore, I must conclude that your statement about a Pi network not being
resonant just might be true as it can't be disproved.
There is a lot more to be said about this subject as it seems to come up
from time to time. I can't tell if you are really serious about this "non
resonant network" or just pulling our chain about it.
I would appreciate knowing the answer to this before spending a lot of time
building up the remotely tuned dip meter or thinking too much about it.
By the way, I had a grammar slip in an earlier e-mail calling a point "mute"
really meaning "moot". I know you saw that and thank you for graciously not
pointing it out!
Best Regards,
Gerald K5GW
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