ELECRAFT K2 - Page 2

Setting the AGC Threshold
Exit the
CAL S HI
function by tapping
MENU
.
Make sure the RF GAIN control is rotated fully clockwise.
Locate potentiometer R1 on the Control board (right side, as
viewed from the front of the K2).
Set your DMM for DC volts. Connect the (-) lead of the
DMM to one of the ground jumpers or to the K2 chassis ground.
Touch the (+) lead to pin 5 of U2 on the Control board. (U2 is
located just above trimmer R1. Pin 5 is the pin nearest diode
D1.)
Adjust R1 for a reading of
3.80
volts on the DMM. This is the
suggested setting, but it can be adjusted later to suite the
operator.
i
The S-meter must be realigned anytime
the AGC
threshold setting is changed. S-meter
alignment is covered
in the following steps:
S-Meter Alignment
Using the menu, select the
CAL S LO
function (S-meter
zero). Hold MENU
a second time to activate it.
Turn the VFO knob until you see only the left-most segment
of the LED bargraph lit. Then turn the knob a bit more clockwise
until this LED just turns off.
Exit the
CAL S LO
function by tapping
MENU
. Enter the
menu again and select
CAL S HI
(S-meter full-scale
sensitivity).
Turn the RF GAIN fully counter-clockwise (minimum gain).
Adjust the VFO knob until you see segment 9 of the bar graph
lit,
then turn it a bit more counter-clockwise until segment 10 just
turns on (right-most segment).
Turn the RF GAIN control back to its full clockwise position.
1