[Yaesu] Mechanical vs. Crystal filters

[Hans Remeeus]

The Inrad #705F (500 Hz) and #712F (300 Hz) Collins filters have a shape 
factor of more than 2.5.

#705F -  BW6: 595 Hz, BW60: 1,560 Hz (pancake)
#712F -  BW6: 340 Hz, BW60: 850 Hz

The Inrad #528 (500 Hz) and #703 (400 Hz) crystal filters have a shape 
factor of 1.7.

#528 -  BW6: 520 Hz, BW60: 870 Hz
#703 -  BW6: 445 Hz, BW60: 760 Hz

All are 455 kHz IF-filters.

Please notice for example the significant difference between #705F and #528.

Price of Collins filters: $125
Price of crystal filters: $155

For $30 more you get filters with a much better shape factor and 
performance!


73,
Hans Remeeus (PA1HR)
http://www.remeeus.eu
Communication is about people, the rest is technology.



KC3VO at aol.com schreef:
> How about a comparison of filters with the SAME bandwidth?    You 
> compared two sets of entirely DIFFERENT filters!  Compare SSB 455 khz 
> crystal filters to SSB 455khz mechanical filters, of the same advertised 
> bandwidth, and also note size and cost, if possible. 73, KC3VO
> 
>