Front panel board components – Elecraft KSB2 User Manual

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BFO Setup for LSB/USB

Tap the

B A N D -

button to see the BFO setting for the first SSB filter (BF1). You should see a display

similar to BF1 t120

. The BFO frequency control parameter (in this case 120 ) has a range of 000-255.

(A lower-case letter t appears in the BFO display for BF1, e.g. BF1 t120

. This is a reminder that on

transmit, BFO setting BF1 is always used, regardless of how you set the BFO for FL2 through FL4.)

Tap

D IS P L A Y

to show the present LSB BFO frequency in kHz. Adjust the VFO knob until the BFO

is as close as possible to the LSB/BF1t freq. from Table 3. Then tap

B A N D -

to return to the BFO

parameter display.

Tap

M O D E

to select USB mode. You should now see a display similar to BF1 t200

Tap

D IS P L A Y

to show the present USB BFO frequency in kHz. Adjust the VFO knob until the BFO

is as close as possible to the USB/BF1t freq. from Table 3. Tap

B A N D -

Exit the menu by tapping

M E N U

Using only FL1, listen to a few SSB stations. (Use LSB on 40 meters and below, and USB on 20

meters and above.) In later sections we'll describe various ways to set up FL2, 3, and 4 on receive (see
Table 3). You'll also be able to fine-tune the transmit BFO settings, if necessary, to match your voice.
Note: Use CAL FIL only on 17 meters and below. The BFO settings for LSB and USB are swapped on 15,
12 and 10 meters due to the K2's frequency mixing scheme.

Front Panel Board Components

Remove the two screws that hold the Control board to the Front Panel board. Remove the four chassis

screws that hold the Front Panel assembly to the chassis, then carefully unplug the Front Panel assembly.

Remove the knobs, optical encoder hardware, and the flat-head screw to the left of the encoder shaft.

(Do not remove the screw holding the associated standoff to the Front Panel PC board.) Separate the Front
Panel from its PC board.

The front-panel SSB components will be installed in a small area located between the four

potentiometers on the left-hand side of the board.

Install the following components on the Front Panel board:

__ C4-C8 (all .01 µF)

__ Q3 (2N3906)

__ RP3 (10 K, 8 pins) __ R13 (68.1K, 1%)

Turn the Front Panel board upside down and install the microphone configuration connector, P1. The

short ends of the pins go into the board, and the connector must be soldered on the front side. Be very
careful when soldering the pins of P1, which are very close to pushbutton switch S6.

Re-assemble the Front Panel board (including knobs and hardware), but leave it unplugged.