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N3REY.  You may make a copy of all articles for personal use
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COHERENT CW NEWSLETTER (Copyrighted May, 1975) CCWN 75:6

CCW FILTER KITS ARE READY

         Ray Petit has the kits for the CCW filter he has
designed ready. Those who wish these kits should send (Ray Petit,
Box 51, Oak Harbor, WA 98277) $45 to cover costs and mailing. The
kits include the printed circuit boards and most of the parts.
Those of you who have previously sent money should send the
remainder. Future issues of CCR; will include the assembly
instructions and technical explanations of the operation of the
filter.

CCW BEACON

         Andy McCaskey, WA7ZVC will soon have the capability of
providing a CCW beacon on 3,550,000 cycles for us. We are
thinking of one evening a week or perhaps by mail request.

SOME DEFINITIONS OF RELEVANT CONCEPTS

         Filter: Any transmission network used in electrical
systems for the selective enhancement of a given class of input
signals.

         Matched filter: A filter with the property that, when
the input consists of noise in addition to a specified desired
signal, the signal-to-noise ratio is the maximum which can be
obtained in any linear filter.

         Signal-to-noise ratio: The ratio of the amplitude of a
desired signal at any point to the amplitude of noise signals
at the same point.