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Q Help! - RF Cafe Forums

The original RF Cafe Forums were shut down in late 2012 due to maintenance issues. Original posts:

Amateur Radio | Antennas | Circuits & Components | Systems | Test & Measurement


spbhu
Post subject: Q help! Posted: Mon Aug 08, 2005 6:39 am

Lieutenant

Joined: Tue Aug 02, 2005 1:44 am
Posts: 3
Location: NTU
People always say a high-Q peaking inductor or low high-Q peaking inductor? What does it mean? What does Q stand for, and high Q better or low Q better?
Thanks


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IR
Post subject: Posted: Mon Aug 08, 2005 11:52 am

Site Admin


Joined: Mon Jun 27, 2005 2:02 pm
Posts: 373
Location: Germany
Hello spbhu,

Q stands for Quality Factor. It defines the ratio between the energy that is being lost on power dissipation per cycle to the entire energy of the cycle. Another way to put it is:

Qul=Xl/R (Unloaded Quality Factor)

Where:

Xl - The reactance of the inductor (2*pi*f*L)
R - The ohmic resistance of the inductor's wire.

High Q is better since it means that there is a lower resistive dissipation in the inductor. There are few ways to achieve that like using air core or lower resistance materials for the wire.

_________________
Best regards,

- IR


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Guest
Post subject: Posted: Mon Aug 08, 2005 11:53 am
Q (Quality factor) is the ratio of reactive power to resistive power in a tuned circuit.



Posted  11/12/2012

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