[1000mp] Mechanical x Crystal Filters

[James Headrick]

Eric,  this answer to your question may not be too helpful.  Actually a 
crystal filter is a mechanical filter where the mechanical parts are plates 
of quartz.  When something is called a
Collins Mechanical filter it probably uses Ni-Span C or some other metal in 
the mechanical parts.  The mechanical vibration resonances are what are 
used used in filter design.  Quartz inherently has a much higher Q than 
that of metal, so a quartz filter can have sharper edges than those made of 
metal.  Some people don't like sounds that go with a sharp edge, steep 
sided filter,  its a personal preference sort of thing.    73   jim  w3cp


At 01:27 4/7/2003 -0300, you wrote:
>Hi,
>
>My name is Eric - PY2EMC and I am trying to understand the differences
>between crystal filter versus mechanical filter.
>
>I want to understand where and when I can use one or another.
>
>Where can I found this information ?
>
>I appreciate any help.
>
>73's & DX
>Eric - PY2EMC
>http://www.cwsp.org.br
>
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