[Elecraft] 200Hz vs 250 Hz filter

[Bill W4ZV]

Ed Muns, W0YK wrote:
> 
> BTW, all this discussion about what each filter's bandwidth actually is
> vs.
> what it's name is, raises a related point.  With the K3, the DSP bandwidth
> at which a given crystal filter kicks in can be set to the nearest 50Hz.
> For example, if your "500 Hz" filter actually measures 565Hz at the -6dB
> point, then you can tell the K3 it is 550Hz wide.  Same for the center
> frequency.  If yours is off by a few Hz, that can be cranked into the Fc
> parameter for the filter.
> 

This is another reason I prefer the 500 Hz.  When you use DUAL PB at the
minimum width setting, the K3 sets DSP WIDTH = 150 and selects whichever
roofing filter is active at 600 Hz.  Since the 500 filter is actually 565
Hz, I set my CONFIG Menu to 600 (the point at which the 500 engages).  So my
500 Hz is used instead of the next higher roofing filter when DUAL PB is set
to minimum.  Of course you could also set a 400 Hz to be selected at 600,
but then you would have a deadband for normal operation between its 435 Hz
bandwidth and the next higher filter engagement at 650.

73,  Bill

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