Elecraft K3 Owner's Manual - Manual (Page 51)

51
Front Panel Temperature Sensor
• Turn the K3 OFF. Allow about 15 minutes for
the radio to cool to room temperature.
• Turn the K3 ON.
• Locate the CONFIG:FP TEMP menu entry.
Adjust the parameter to match the reading of a
room thermometer. Note: Deg. C = (deg.
Fahrenheit - 32) * 0.555.
Front panel compartment temperature can be
monitored continuously. Tap D IS P , then use VFO
B to select the FP xxC alternate display.
PA Temperature Sensor
• Turn the K3 OFF. Allow about 15 minutes for
the PA heat sink to cool to room temperature.
Do not turn the K3 ON during this period.
• Turn the K3 ON.
• Locate the CONFIG:PA TEMP menu entry.
Adjust the parameter to match the reading of a
room thermometer. Note: Deg. C = (deg.
Fahrenheit - 32) * 0.555.
PA heat sink temperature can be monitored
continuously. Tap D IS P , then use VFO B to select
the PA xxC alternate display.
S-Meter and RF GAIN Control
S-meter and RF GAIN control calibration is
normally adequate using the factory settings. The
optional S-meter calibration procedure below may
provide better results.
You can optionally linearize main and sub
receiver IF gain using the “Calibrate RF GAIN”
procedure in K3 Utility (Calibration tab). This
should be done before S-meter calibration.
Calibrating the S-meter requires a 1- µ V/50- µ V
signal source (an accurate signal generator such as
an Elecraft XG1 or XG2 can be used).
• Switch to a band applicable to your signal
generator.
• Select CW mode.
• Set transmit power to 0.0 W using P WR .
• The S-meter has both relative and absolute
modes. Refer to the CONFIG:SMTR MD
menu entry description if you wish to switch
from relative to absolute. (Relative mode is
easier to calibrate and is the factory default.)
• Turn the attenuator off ( A T T ).
• If you have CONFIG:SMTR MD set to NOR ,
turn the preamp on ( P R E ). If SMTR MD is set
to ABS , turn the preamp off.
• Tap A G C to select slow AGC ( AGC -S ).
• Bypass the ATU, if installed, by holding A T U .
• Set RF GAIN to maximum (fully
clockwise). (Note: If you’ve assigned the RF
gain control for the present receiver to squelch,
its RF gain will default to maximum unless
you’re controlling RF gain from a remote-
control computer application.)
• Normalize DSP filtering (hold N O R M ; pg. 14).
• Connect the signal generator to ANT1 and set it
for 50 microvolts RF output.
• Tune to the frequency of the signal generator
(tune for peak audio response). You can also
use auto-spot (pg. 30) to accurately match the
pitch of the signal, ensuring that it is centered in
the passband.
• Locate the CONFIG:SMTR PK menu entry;
set it to OFF .
• Locate the SMTR SC menu entry (S-meter
scale). Use the VFO A knob to set it to the
default value (
14 ).
• Locate SMTR OF (S-meter offset). Adjust it
for an S-9 reading. The default value ( 24 ) may
suffice.
• Switch the signal generator to 1- µ V output; the
S-meter should now indicate about S-2 to S-3.
If not, change SMTR SC by 1 unit (try 15 first,
then 13, then 16, then 12). After each SMTR
SC change, re-adjust the SMTR OF setting for
an S-9 indication.
• When you have completed this procedure,
disconnecting the signal generator should now
show NO bars on the S-meter.