[1000mp] mixing inrad and yaesu filters

[Bill Miner]

John,

Narrow crystal filters with steep skirts will have a ringing problem
with noise pulses and they generally have ripple within the bandpass. 
Collins mechanical filters tend to ring much less and have a very FLAT
bandpass.

OBTW  Collins Radio is very much still in business supplying high end
avionics to the US Government as well as  components such as mechanical
filters.

73,
Bill - K6WLM

John Tait wrote:
> 
> Subject: Re: [1000mp] mixing inrad and yaesu filters
> 
> > Looking at George's list (very handy), the Collins filters have a much
> > broader shape-factor.  For example, the YF-115C 500 hz filter has a 2.6
> > factor.  Are there other factors that would indicate that a Collins filter
> > should be used for CW, over a regular crystal filter?
> 
>  The only advantage that a mechanical filter has, is price.. A crystal
> filter is superior to a mechanical filter. Shape factor is an indication of
> the quality of the filter. The lower the number, the better is the quality..
> A shape factor of 1 is a "perfect" filter..i.e. the the sides of the
> response curve are vertical. The modern penchant for Collins filters is
> misleading...cashing in on the excellent reputation that the original
> Collins filters had. That company ceased to exist years ago..unfortunately.
>   HNY es 73
>       John EI7BA
> 
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