Elecraft K2ATOBKIT - Manual (Page 15)

15
Fine-Tuning Filter Settings
You can optionally fine-tune your BFO settings
for each mode by ear or by using a computer-based
tool such as Spectrogram.
If you have the KSB2 option (SSB adapter), and
you made the recommended changes to the second
crystal filter, you may wish to fine-tune the LSB and
USB BFO settings so that the filters have the same
noise pitch.
Note: Only the SSB BFO settings for FL2, 3, and 4
should be made in receive mode. The SSB BFO
settings for FL1 should be made in transmit mode,
either listening to your signal locally or having a
nearby station listen for you. This is because FL1 is
always used in transmit mode (and for receive, when
selected), whereas FL2-4 are only used in receive
mode. FL2-4 can be set up differently without affecting
your transmitted signal. Refer to the KSB2 manual for
more details.
AF GAIN Potentiometer Test
The following two steps apply if you made the AF
GAIN potentiometer smoothness modification.
Rotate the AF GAIN control slowly, near the
counter-clockwise end of its rotation, while listening to
a steady carrier (e.g., the internally-generated signal at
4.000 MHz). There should be no noticeable noise
(crackles, etc.) as you rotate the control.
Set the AF GAIN control to its fully counter-
clockwise position (minimum gain). You should hear
complete silence, with no audio signal leak-through.
13. Speaker grille cloth
Grille cloth (part #E850089) can optionally be added to
your original K2 top cover. (The KPA100 module
already has grille cloth for its speaker.)
Remove the speaker from the top cover. This may
involve removing the battery option (KBT2) or other
top-cover options. If you do have to remove a battery,
be sure to turn the battery switch OFF using the rear-
panel slide switch. Also, disconnect both leads from
the battery terminals and cover the terminals with tape
to prevent accidental shorts.
Trim the supplied grille cloth to the size of the
speaker frame.
Place the #4 fibre washers (black) at each of the
top cover's four speaker mounting holes. Trim the
corners of the grille cloth so it just fits between the
fibre washers, not touching them.
Place the speaker on top of the fibre washers and
grille cloth. Secure it with four 3/8" (9.5 mm) screws,
#4 lock washers, and 4-40 nuts. Do not over-tighten the
nuts.
Re-install the top cover or KPA100 module.