[CQ-Contest] Collins Filters in Contest Rigs

[TOMK5RC at aol.com]

In a message dated 8/8/98 8:55:22 AM Central Daylight Time, henrypol2 at juno.com
writes:

<< Why are these filters better than the more popular standard
 stock/optional crystal filters?  Are they better than the INRAD (formerly
 IRCI) filters?  >>

Traditionally, Collins mechanical filters had better shape charactaristics
than crystal filters. Put an R4C and 75A-4 side by side and you can hear the
difference. The transducers in the mechancial filters also gave CW signals a
unique "depth" to them. If this sounds like subjective mumbo-jumbo, it is.
Crystal filter design has improved and Rockwell is manufacturing Collins
filters, so it's going to take a lab to compare them for actual shape and loss
and declare a winner.

Tom, K5RC


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