eHam
eHam Forums => Long Wave / Medium Wave => Topic started by: K6STI on February 22, 2020, 07:36:55 AM
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I've written some Windows utilities for the HP 4342A Q meter. They should be useful with other Q meters as well. They are particularly useful for measuring large coils at low frequencies.
If an inductance is too large to resonate with a Q meter's variable capacitor at the frequency of interest, you can add an auxiliary capacitor to achieve resonance. However, even if the Q of the auxiliary capacitor is very high, it can significantly alter indicated Q. For example, if you use a 3000 pF auxiliary capacitor with a Q of 3000 to augment a variable capacitance of 300 pF and the indicated Q is 600, the meter would read 733 if the auxiliary capacitor had no loss. All that's needed to correct indicated Q is the capacitance and Q of the auxiliary capacitor. You can use the Q meter to measure both. The utilities in this package perform the necessary calculations.
http://ham-radio.com/k6sti/hp4342a.zip
Brian
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I've written some Windows utilities for the HP 4342A Q meter. They should be useful with other Q meters as well. They are particularly useful for measuring large coils at low frequencies.
If an inductance is too large to resonate with a Q meter's variable capacitor at the frequency of interest, you can add an auxiliary capacitor to achieve resonance. However, even if the Q of the auxiliary capacitor is very high, it can significantly alter indicated Q. For example, if you use a 3000 pF auxiliary capacitor with a Q of 3000 to augment a variable capacitance of 300 pF and the indicated Q is 600, the meter would read 733 if the auxiliary capacitor had no loss. All that's needed to correct indicated Q is the capacitance and Q of the auxiliary capacitor. You can use the Q meter to measure both. The utilities in this package perform the necessary calculations.
http://ham-radio.com/k6sti/hp4342a.zip
Brian
Thanks Brian for posting that.
My Q-Meter and I thank you.
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Thanks Brian for some more good work with coil Q. I have one of the HP meters (Eb Keller's old meter) and will be able to use your program. 73, Ed, KI6R