Operation With A Yaesu Ft-817 Using The Optional Ft-817 Interface Cable; Initial Operation Settings With The Ft-817 Interface Cable; Amplifier Operation With The Ft-817 Interface Cable - ELECRAFT KXPA100 Owner's Manual

Clearing ATU Memories: At the KX3, hold
. Hold
MD
ATU memories are being cleared. Do this for each band you want to clear. The tuning
solutions for both antennas are cleared at the same time. Clearing ATU memories is
useful when changing to a new antenna to ensure the ATU stores new tuning solutions
rather than using previous tuning solutions that might not be optimum. Also, you can
clear the memories for selected bands and antennas using the KXPA Utility program
(see page 35).

Operation with a Yaesu FT-817 Using the Optional FT-817 Interface Cable

The following instructions assume that your FT-817 transceiver is connected to the KXPA100 amplifier
using the FT-817 Interface Cable as shown in Figure 4 on page 14.
ALC Adjustment: The KXPA100 Automatic Level Control (ALC) circuit must be adjusted to
provide the correct output power. See Adjusting the KXPA ALC on page 44.

Initial Operation Settings with the FT-817 Interface Cable


On the KXPA100, set the

Switch the KXPA100

Connect a 50-ohm dummy load or antenna feed line that presents an SWR of less than 1.5:1 to the
active KXPA100
will light indicating which antenna connector is active and the
have the KXAT100 ATU installed use the
the selection. Be sure you have a suitable load attached to the active antenna connector.

Amplifier Operation with the FT-817 Interface Cable

Fault Conditions: If the
30 for a description and remedy.
Apply about 2.5 watts of RF drive to the KXPA100:

Transmit Mode: The
mode. (If the LED does not light, the amplifier remains in receive mode and the RF drive simply passes
through. Check the FT-817 Interface KEYIN1 / TX GND connection in the FT-817 interface cable (see
the schematic diagram on page 43).

Band Switching: The KXPA100 automatically follows band changes at the FT-817. The amplifier also
senses the frequency of the RF from the KX3. If the band data is missing or does not agree with the
frequency sensed for any reason, the amplifier switches according to the frequency sensed.
(the knob).
OFS
C L R
switch to
3 dB ATTEN
switch to
OFF/ ON
connector. If you have the optional KXAT100 ATU, the
ANT
LED on the KXPA100 front panel lights, refer to Faults on page
Fault
on the amplifier front panel will light indicating that it is in transmit
TX LED
, and turn the
M E N U
will appear on the KX3 LCD while the
MEM CLR
OUT/AUTO.
. The LED will light.
ON ON
Man MODE
connector. Hold the KXAT100
ANT 1
25
knob to
OFS
ATU.x
ANT 1 or ANT 2 LED
LED will light. If you do not
switch to change
AN T