title: Radio Theory Handbook. Beginner to Advanced.
author:  Mr Ronald Bertrand 
description: Ron Bertrand has a broad experience in the Radio Communications and related industries. With over 40 years experience involved in the delivery of training programs to technical trainees, technical officers and radio (amateur) experimenters. In 1997 Ron founded the Radio &amp; Electronics School (RES) in Australia. RES is an organisation of volunteer mentors and is not for profit. RES has worked together with many thousands of students of all ages to help them achieve their goals. Such goals could be anything from a hobby to a career in radiocommunications. RES is an online school and can be found at www.res.net.au
zlib_text: Radio Receivers    
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  3.9-a Reaction - type Receiver 
  In the previous project, in the context of Pic.3.26, we have seen how important it its for an oscillatory circuit of 
  the receiver to have as big Q- factor as possible. The bigger it is, the receiver gets more selective, i.e. capable 
  to separate the signal of the station the oscillatory circuit is tuned at from the multitude of signals in the 
  reception antenna, at the same time suppressing other signals. There is yet another important thing to be 
  emphasized: the voltage in the oscillatory circuit is Q times bigger than the voltage that is being led to it from 
  the antenna. If Q=95 and the voltage in the antenna is, say, 1 mV, the voltage exiting the circuit is then 95 
  mV. It is then clear that the Q- factor should be as big as possible. Some improvements can be made by using 
  the silver - coated wire instead of the plain copper o