Elecraft KAT500 Owners Manual User Manual
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In addition to the supplied cables, you will need two E850463 Aux cables. Normally you will have one
already connected between your K3 and KPA500, so you may need one additional cable. This is the same
cable included in the KPAK3AUX cable set. You can purchase the cable from Elecraft (order E850463)
or, you can construct your own cable using male and female DB-15 connectors wired as follows.
IMPORTANT
Do not use standard VGA cables. The E850463 Aux cables are wired differently.
Table 1. E850463 Aux Cable Wiring.
CONNECTOR PINS
SIGNAL
2 2
AUXBUS
3 3
BAND
1
5 5
GND
9 9
BAND
2
10
10
PTT (or KEY)
11 11
Inhibit
12 12
GND
13 13
BAND0
14 14
BAND3
15
15
ALC (Normally not used. See your KPA500 Owner’s Manual)
The basic E850463 Aux cabling setup is shown in Figure 1. If your station setup requires that other
equipment (e.g. SteppIR controller) have access to the key line to inhibit the amplifier, use the cabling
described in Figure 2.
50-ohm coaxial RF cables with PL-259 connectors.
Be sure you select the antenna output on the K3 that connects to the KPA500.
The KAT500 allows up to three antenna connections, selected from the front panel (See
Operation, page 14).
Two wire power cable with a female 2.1 mm coaxial connector.
Connect to the station 11 to 15 VDC power supply with the white striped lead to the positive
terminal.
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).
E850463 Aux interface cables with male and female connectors.
Do not use common VGA cables; they are not wired correctly for this use. You can order
E850463 from Elecraft or you can make your own (See E850463 Aux Cable Wiring, above).