A question for the math experts:
I would like to measure the Q of a pi network plate circuit directly
using an SWR analyzer.
Let's say the tube is in circuit with power off. I have connected a
2200 ohm resistor from anode to ground to simulate the tube's plate
load impedance. I connect an SWR analyzer (50 ohm) to the output, set
to 14 Mhz, and tune the tank circuit for a perfect 1:1 SWR at that
frequency. Now I vary the frequency of the analyzer by a certain
amount - say 1 Mhz for discussion purposes - and now the SWR reads
2:1, so the 2:1 SWR bandwidth is 2 Mhz at 14 Mhz.
From this is it possible to calculate the Q of the tank circuit?
Obviously, the higher the Q, the smaller the 2:1 SWR bandwidth, but
is it possible to calculate it exactly?
This would be a very useful thing to do in order to check one's
calculations against reality.
Thanks in advance,
73, Bill W6WRT
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