Mike,
What you would be checking for is opposite sideband suppression and
you'll need a very strong single tone signal source. S9 + 20 or
thereabouts is a good level, and this can be on or around 20m. There's a
procedure to do the calibration in the KXFL3 installation instructions,
but the following is a fairly quick approach if you have a handy signal
to use.
- Turn AGC MD (menu) to OFF. Set AF gain to 1 before tuning to a strong
signal. Set the PBT BW for 2 kHz, which should be FL1 setting.
- Set mode to CW and check your PITCH setting. Multiply the pitch by 2
and set up RIT for minus this amount. For example, if PITCH is 550 Hz,
set RIT to -1.10 kHz. Turn RIT OFF once it's set up.
- Tune to the signal and adjust the preamp setting if needed to try and
get the level to S9+10 or more.
- Turn RIT on to hear the opposite sideband. The signal should be very
weak and likely close to the noise floor. You'll also normally need to
turn the AF gain way up to hear it.
- Turn the AF gain back down then reduce the PBT BW so you get a change
to FL2 and then again to FL3. The opposite sideband should be very weak
for those settings as well. If it jumps up considerably, or if it's
just not very weak for any of the BW settings, a calibration would be
helpful. In that case, follow the procedure in the KXFL3 installation
instructions.
- Don't forget to turn AGC back on when done :-)
73,
Rich AC7MA
On 07/08/2013 10:12 AM, Mike WA8BXN wrote:
The instructions suggest that realignment of the filter may be necessary if
some of the capacitors are pressed on the board. Is there any simple way to
tell if such realignment is necessary? Is it very likely that if those parts
are not touched realignment is not needed?
73 - Mike WA8BXN
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