Elecraft KPA100 Manual - Manual (Page 49)

49
Tap
M E N U
to enter the K2 menu, then scroll to the CAL menu
entry. Hold
E D I T
to highlight the CAL parameter. Select CAL tPA
(KPA100 temperature calibration). Then hold
E D I T
again to activate the
C A L t P A function.
Using the VFO knob, adjust the temperature shown on the LCD to
match the room temperature in degrees C (Celsius). To convert
Fahrenheit to Celsius, subtract 32, then multiply the result by 0.55.
Tap or hold
M E N U
to exit CAL tPA.
Select and activate the CAL CUR menu entry. Set the current limit
to 3.50 amps if it was set lower than this. This should prevent any HI
CUR
warnings when driving the K2/100 to full power.
KPA100 Power Supply Test
In following tests, you'll connect both your low-current and high-current
power supplies to the K2 in different combinations. This will test the K2's
dual-supply capability, which is useful for emergency-power situations.
For example, if a 12 volt battery is kept float-charged and connected to
the K2's low-current DC input jack, the transceiver can be operated at the
10- to 15-watt level even if the power mains go down or the high-current
supply fails.
i
Do not key the transmitter during these tests.
Turn the K2 off. Disconnect the low-current power supply.
Make sure your high-current power supply is turned off.
Connect the high-current supply (20 A) to KPA100-J3.
Connect the KPA100's internal K2 DC cable (KPA100-J4) to the
K2's Aux 12V input (K2-P3, on the RF board).
Rotate the K2's POWER control fully counter-clockwise.
Turn your high-current supply on. The K2 should remain off.
Check your high-current supply's voltage and current drain, if it has
built-in metering. The voltage should be the same as its no-load voltage
(nominally 13.8V). The current should be nearly zero.
Turn on the K2. You should not see a NO PA PS message, since
you do have a power supply connected to the KPA100.
Check the K2's voltage and current using the
D I S P L AY
switch. The
voltage indicated should be the same as the high-current power supply's
voltage, less about 0.3 to 0.5 volts (the voltage drop across diode
KPA100-D9). The current should be about 100-200 mA higher than with
the KPA100 removed.
Tap
M E N U
, then tap
D I S P L AY
to access the secondary menu.
Scroll to the PA menu entry, then hold
E D I T
and change the parameter to
O F F . Exit the menu.
Verify that the POWER control range is 0.1-15 watts.
Use the menu to set the PA parameter to ON. Exit the menu.
Verify that POWER can now be set in 0.5-watt increments up to
10.0 watts, and 1-watt increments from 11 to about 110 watts. Below 11
watts, the KPA100 will be in "bypass" mode. You should hear the bypass
relays on the KPA100 (K1 and K2) switch at this point.
Turn the K2 off. Also turn off your high-current power supply.
Leaving the high-current power supply connected, but turned off,
connect the low-current power supply to the K2's normal DC input jack
(barrel connector, RF-J3).
Turn the K2 ON. After ELECRAFT is shown on the LCD, you
should see the message NO PA PS. POWER range will be 0.1-15 W.
Turn the high-current power supply on. You should see
PA PS ON . POWER range should again be 0.1 to 110 watts.
Turn the high-current power supply off. After 1 to 10 seconds,
should see NO PA PS. The delay depends on how long it takes for the
high-current power supply to drop to about 8 volts.