[1000mp] mixing inrad and yaesu filters

[John Tait]

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