Elecraft KXPA100 Manual - Manual (Page 19)

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Ground Connection: Connect the station ground to the thumbscrew. A good station ground with short,
direct leads connecting each piece of equipment is important for consistent, reliable operation.
DC Power Connection:
CAUTION:
If the station power supply is energized, be sure the power switch on the front panel
(see Figure 7 on page 21) is in the OFF position before proceeding.
Connect the Anderson PowerPole® connector to either mating connector on the back of the amplifier.
Red goes to red and black goes to black. Connect the other end to your power supply with the black
wire connected to the negative (-) terminal.
To avoid excessive voltage drop under full load, keep the lead length as short as you can. Also,
connect the dc supply to the lower connector. It has a slightly more direct connection inside the
KXPA100. The second PowerPole® connector on the amplifier is paralleled with the first. It can be
used to extend power to other equipment such as the KX3 transceiver.
If you experience excessive voltage drop due to the resistance of the power cable, you can use the
second connector for a second parallel lead from your power supply. If used, the second power lead
should be fused identically to the first at the power supply end of the cable.
If you connect cables to both Anderson PowerPole® connectors, we recommend you tie the two
cables together with a cable tie. That will greatly increase the force needed to pull the cables out of
the connectors on the amplifier.
Personal Computer Interface Cable: This cable is not required, but provides enhanced capability to
operate the KXPA100 from your personal computer using the KXPA Utility program, for updating
the KXPA100 firmware and other functions (see Utility Program, page 34 for details.)
RF Signal Connection Between the Transceiver and KXPA100: 50-ohm coaxial cable with a PL-
259 (UHF male) connector for the amplifier RF IN and whatever connector type is required by the
transceiver antenna output.
RF Connection to Antenna or Dummy Load: Normally a 50 ohm coaxial cable with a PL-259 (UHF
Male) connector leading to a 100 watt dummy load or antenna. A direct connection to an antenna wire
may be used here instead if it presents a low enough SWR or your KXPA100 is equipped with the
optional KXAT100 ATU (antenna tuner). There will be only one
ANT connector if you do not have the
optional KXAT100 ATU. The ANT 2 position will be filled with a plug.
Key Line Connection to the Transceiver: The key line controls the amplifier. When grounded, it
enables amplification for transmit. When not grounded, RF passes between the amplifier and antenna
without amplification for receiving or for transmitting with the driving transceiver power only. The key
line circuit must sink about 1 mA when grounded. Refer to the Owner’s manual for your transceiver to
properly connect your key line. If you are using a KX3, the key line is on the ring of the 2.5mm
ACC2
connector. For transceivers without a key line output the amplifier may be controlled manually using a
foot switch or other switch to ground the key line to enable the amplifier.