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[Domenic M. Mallozzi]

In a message dated 3/16/01 8:34:41 PM !!!First Boot!!!, k2aq at ARRL.NET writes:

<< HEATH at LISTSERV.TEMPE.GOV >>

Hi

As with any Q-meter the coil must be within the frequency range of the
Q-meter before you start. this especially true with torroids wound on ferrite
cores.


To use the QM-1

Set the Range switch to the appropriate frequency range (A,B, C, or D) and
set the left hand frequency dial to the frequency you want to measure Q at.
Set the CAL-Q switch on the QM-1 to CAL
Connect the coil to the "L" terminals
Set the level control until the meter reads "X1"
set the CAL-Q switch to Q.
Adjust the resonance dial until the meter peaks.
Read the Q on the meter and the approximate inductance on the resonance dial.

Some general notes:

-Q of a coil varies with frequency, especially those with ferrite cores.
-If you need more capacitance to resonate the coil than the Q meter dial has
you can put a cap in parallel with the internal variable by putting it on the
"C" terminals (located on the right of the two "L" terminals on top of the
QM-1. Obviously you will have to recalculate the resonating capacitance based
on the internal value plus the cap accross the C terminals. Also the added
caps own Q will cause the Q of the coil to be a bit low. If you need to use
this technique use the best cap you can for the added cap (air or mica are
good choices).

If you have more questions send me an e-mail. Pretty familiar with Q meters
so should be able to help.

73's

Dom
N1DM

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