[Amps] Q meter [TSPA]

[John T. M. Lyles]

The Q meters that use resonance of a component against a known 
standard capacitor or inductor are not so useful to measure unloaded 
Q of a tank circuit. I am referring to the old Hp and Boonton Q 
meters. They are used to measure Q of coils, DF of capacitors, and so 
forth. Loaded Q of a tank circuit, i.e., with the tube plate 
resistance at one end and the load Z at the other, can be calculated. 
Unloaded depends on the quality of components, skin resistance, 
connection integrity, etc. In VHF/UHF cavities, the unloaded can be 
quite high.

73
John
K5PRO


>Date: Thu, 06 Jan 2005 15:26:28 -0500
>From: Will Matney <craxd1 at ezwv.com>
>Subject: [Amps] PLATE RESISTENCE
>To: amps at contesting.com
....
>Even though the Q is a factor plugged into the formula, there are "Q
>meters" for testing the actual Q of a built component-network. After the
>tank is complete, or just the tank coil itself, the actual Q can be
>found with the meter and then compared to the value you arrived at from
>the formulas. Most LCR meters have the capacity to test the Q of a
>component or circuit. There are more accurate Q meters available though.
>