19
3 BAND1 OUT; BAND0-BAND3 outputs provide 4-bit parallel band
indication
4 PTT IN (in parallel with PTT jack as well as mic PTT)
5 Ground
6 DIGOUT0; low-power external transverter select
7 K4 "power on" signal or TX Inhibit input (see TX Inhibit Mode)
8 Power On; pull to ground (0 V) for 0.2 to 1.0 sec to turn K4 on,
then release
9 BAND2 OUT; BAND0-BAND3 outputs provide 4-bit parallel band
indication
10 KEY OUT LP; low-power keying output (10 mA max) (see note below)
11 DIGOUT1; per-band/per-antenna output (see DIGOUT1 menu
entry)
12 Ground
13 BAND0 OUT; BAND0-BAND3 outputs provide 4-bit parallel band
indication
14 BAND3 OUT; BAND0-BAND3 outputs provide 4-bit parallel band
indication
15 EXT ALC; negative-going ALC voltage from external amplifier
Note: If you're controlling an Elecraft KPA500 or KPA1500 amplifier from
the K4 via the accessory cable, you normally won't need to use a separate
KEY OUT cable. There are exceptions to this; refer to the key line
interrupter information in your amplifier manual.
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