Elecraft

XTAL FILTERS

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PERRY BAKER

XTAL FILTERS

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

PERRY WA8THK FP#582
GAINES, MICHIGAN -USA
http://www.usol.com/~wa8thk/WA8THK.htm

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Don Wilhelm-3

RE: XTAL FILTERS

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
>
>

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PERRY BAKER

RE: XTAL FILTERS

--- Don Wilhelm <[hidden email]> wrote:

> 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.

XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

Thanks Don
and others for the email
on the filters for ssb and cw

Got it clear now as to how it works

op1 is SSB tx and rx

any others (FL2 FL3 FL4) are for receive on the
main board, and the tx goes to the op1 for tx
Got it ..

Now that I have had the rig for a year or so. and
installed the Dsp at Christmas time
its fun to go back over it and see just how it works

Very nice radio

Next year I may ask Santa for the 100w board
(not that its needed , but to have something to build)

Perry
WA8THK

> >
> >
>
>

PERRY WA8THK FP#582
GAINES, MICHIGAN -USA
http://www.usol.com/~wa8thk/WA8THK.htm

__________________________________________
Yahoo! DSL Something to write home about.
Just $16.99/mo. or less.
dsl.yahoo.com

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Don Wilhelm-3

RE: XTAL FILTERS

Perry,

One clarification - the BFO used for transmit is always the one associated
with FL1 for whatever mode you are set for - and on SSB the OPx filter is
in-line for transmit (to do its sideband 'stripping task'), so for proper
SSB operation, you must have the SSB FL1 set to OPx. On CW, the transmit
signal does not pass through any of the filters, but the BFO frequency
setting for the FL1 CW filter determines the actual signal frequency.

73,
Don W3FPR

> -----Original Message-----
> Thanks Don
> and others for the email
> on the filters for ssb and cw
>
> Got it clear now as to how it works
>
> op1 is SSB tx and rx
>
> any others (FL2 FL3 FL4) are for receive on the
> main board, and the tx goes to the op1 for tx
> Got it ..
>
> Now that I have had the rig for a year or so. and
> installed the Dsp at Christmas time
> its fun to go back over it and see just how it works
>
> Very nice radio
>
> Next year I may ask Santa for the 100w board
> (not that its needed , but to have something to build)
>
>
> Perry
> WA8THK
>
>
> > >
> > >
> >
> >
>
>
> PERRY WA8THK FP#582
> GAINES, MICHIGAN -USA
> http://www.usol.com/~wa8thk/WA8THK.htm
>
>