Elecraft KPA100 Manual - Manual (Page 57)

57
When an antenna tuner is being adjusted, it can present a very wide range
of impedances to the power output stage. For this reason, initial tune-ups
should be done in QRP mode (10 watts or less). Use only that amount of
power required for your tuner to operate correctly.
Note: If the POWER control is set above 20 watts, power will be
temporarily set to 20 watts when you hold
T U N E
. This can be overridden
by holding
T U N E
and
D I S P L AY
together.
Controls
High Power Configuration and Fan Control
High power (QRO) operation is controlled by the PA menu entry in the
secondary menu. Tap
M E N U
to bring up the primary menu, then tap
D I S P L AY
to select the secondary menu (SEC will flash on the LCD).
Next, scroll to the PA entry using the VFO knob or
B AN D +
/
B AN D -
.
To edit the PA parameter, hold
E D I T
.
The PA parameter has four possible settings:
 OFF puts the K2 in QRP mode (POWER range 0.1-15 W)
 ON is the normal setting (see POWER Control, below)
 Fx.xx shows the KPA100 board's firmware revision
 Exxx shows KPA100 error status, if any (see Troubleshooting)
While editing, tap
D I S P L AY
to change the KPA100 fan mode:
 FAN nor is the normal setting; the fan stays off until needed
 FAN LoHi keeps the fan at low speed, going to high if needed
 FAN Hi keeps the fan at high-speed at all times in QRO mode
Note: In all fan modes, the fan will switch to high speed at a heat sink
temperature of about 40 degrees C. It will turn off within 2 to 4 minutes
after going back below 37 degrees C.
To exit parameter edit, tap
M E N U
once. You can optionally tap
D I S P L AY
again to return to the primary menu (PRI will flash). Tap
M E N U
a second time to return to the normal frequency display.
POWER Control
If PA is set to OFF in the menu, or if the high-current supply is missing,
the POWER control range will be 0.1 to 15 watts. The 10 bargraph LEDs
show output up to 10 W (1 watt per LED bar).
If the PA is set to ON and a high-current supply is connected, the
POWER control covers 0.1-110 watts. The lower third of the control's
rotation provides 0.5-watt increments up to 10 watts (1 watt per LED bar).
The upper two-thirds of the control's rotation provides 1-watt increments
from 11-110 watts (10 W per LED bar). The bypass relays on the
KPA100 will switch at the 10-watt point.
Front-Panel Switches
R F / AL C
: RF or ALC meter mode. Use only for test, not continuously.
AN T 1 / 2
Selects one of two antennas on the Elecraft KAT100 ATU.
T U N E
Puts the K2/100 into tune (key down) mode at no more than 20
watts. Can be overridden by holding
T U N E
and
D I S P L AY
together.
PA KEY Output (KPA100, J7)
The PA KEY output can key an external amplifier's T-R relay. The "8R
HOLD" keying option must be enabled when using the PA KEY output.
See 8R Menu Setting on page 48 for details.
Temperature Calibration (CAL tPA)
See page 48 for PA temperature sensor calibration instructions.