[Yaesu] Mechanical vs. Crystal filters

[Hans Remeeus]

4 x yes.

Some examples:

The Inrad #705F (500 Hz) and #712F (300 Hz) Collins filter 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 #702 (2100 Hz) and #714 (1800 Hz) criystal filters have a 
shape factor of 1.5.

#702 -  BW6: 2.175, BW60: 3.350 Hz
#714 -  BW6: 1.925 Hz, BW60: 2.862 Hz

All are 455 kHz IF-filters.

Those are significant differences!


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



kd4e schreef:
>  > Hans Remeeus wrote:
>> The marketing of Collins filters is excellent.
>> The performance of e.g. Inrad crystal filters is even better...
> 
> Please clarify ...
> 
> Is the consensus that, for example, in a Yaesu
> FT-897D one were to remove the "Collins" mechanical
> filters and replace them with Inrad crystal filters
> one would see a discernible difference?
> 
> Would the difference be worth the hassle?
> 
> Or is the difference only discernible in the lab?
>