Elecraft KAT500 Owners Manual - Manual (Page 12)

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Connect the equipment as described in Figure 3 and the associated notes.
50-ohm coaxial RF cables with PL-259 connectors.
 Be sure your transceiver is configured to deliver power to the antenna output that connects to
the KPA500.
 The KAT500 allows up to three antenna connections, selected from the front panel (See
Operation, page 14).
AH-4 Interface Cable.
 Wire the cable as shown in Table 2, Icom AH-4 Interface Cable Wiring, above.
 The Interface Cable includes the Key Line (sometimes called a PTT line) which controls the
amplifier, enabling it for normal transmission and inhibiting it when necessary to protect
other equipment.
 The transceiver grounds the Key line to enable the KPA500 amplifier. Opening this line
anywhere between the transceiver and the KPA500 will inhibit the amplifier.
Key Line Cables
 The Key Line (sometimes called a PTT line) controls the amplifier, enabling it for normal
transmission and inhibiting it when necessary to protect the amplifier other equipment.
 The key line between the KPA500 and the KAT500 consists of a two conductor (center wire
and shield) cable and connects to the Elecraft equipment using RCA-type male connectors.
 The key line between the KAT500 and the Icom transceiver must be wired as shown in
Table 3. Icom Key Line Cable Wiring.
External Device Controlling the Key Line.
 If you have an external device that must control the key line, you may insert it series with the
key line an either place indicated with the using the appropriate connectors to match the
external device.
Computer interface cable.
 Not required, but used for controlling the KAT500 from a personal computer, customizing
the KAT500’s operation or for updating firmware (see Utility Program on page 20).