[Elecraft] XTAL FILTERS

[Don Wilhelm]

Perry,

The fixed bandwidth filter on the KSB2 option is identified as OP1, OP2,
OP3, OP4 or OP5 - all other filters are identified by a numerical value
representing the filter width and use the variable bandpass filter on the RF
Board.  Note that the numerical value may not be the actual bandwidth, it is
an approximation, but I usually find the actual width to be more narrow than
the number if the filter is narrow, but for some reason, the extremely wide
filter widths are actually wider than indicated - for instance, a 2.00
filter may actually be 2.5kHz wide while a 0.700 filter may be only 500 Hz
wide.  Use Specrogram or some other means to measure the actual filter width
if it is important to you.

To see which filter is currently in use, press the XFIL and AGC buttons
together.  Of course, each mode has its own set of filters, so you must
cycle through each mode and each of the 4 filters for that mode to see the
entire set.  Easier if you want to see all of them - enter the menu CAL FIL
and cycle through the filters in the menu (no need to insert the frequency
probe unless you intend to change the filters).

73,
Don W3FPR

> -----Original Message-----
>
> Question on the xtal filters used on rx.
> I have the SSB board installed
> when in CW mode. what set of filters is the receiver
> using ?
> the ones on the main board or the SSB board ?
> this is for the  K2 radio
> Perry WA8THK
>
>