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ELECRAFT K4 Programmer's Reference Manual page 25

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SET/RESP format: TUn; where 0=exit, 1=tune, 2=tune LP, 3=ATU tune, 4=ATU
extended search tune. This emulates the TUNE, TUNE LP, and ATU switch functions. TU3
is the equivalent of tapping ATU once; TU4 emulates a 2nd tap within 5 seconds. TU0 is
returned automatically the K4 drops transmit for any reason.
TX (Go to Transmit; SET only)
SET format: TX;. Places radio in transmit mode. Exit by sending RX.
UP/UPB (VFO Move Up; SET only)
SET format: UP; (move VFO A up one unit based on current VFO B step size) or UPB;
(same for VFO B). Also see DN/DNB and RU/RD (RIT offset up/down).
TBD: Support for K3 variants.
VG (VOX Gain)
SET/RESP format: VGmnnn; where: m = mode (V/voice, D/AF Data); nnn = 000-060.
Sets VOX gain for specified mode. Also see VX, VI, and SD.
VI (VOX Inhibit or anti-vox)
SET/RESP format: VInnn; where nnn = 000-060. Sets VOX inhibit (anti-vox) level for
voice modes. Also see VX, VG, and SD.
VT$ (VFO Tune Step)
SET/RESP format: VT$n; where n is 0 - 5 (0 - 1Hz, 1 - 10Hz, 2 - 100Hz, etc.)
VX (VOX On/Off)
SET/RESP format: VXmn; where m = mode (C = CW/direct data, V = voice, D = AF
data), and n = 0 (OFF) or 1 (ON). Turns VOX on/off for the specified mode. In CW, PSK-D,
and FSK-D modes, VOX ON means "hit-the-key" CW is enabled (live paddle). Also see
VG, VI, and SD.
TOGGLE format: VX/; turns VOX mode on if it was off and vice-versa.
WM (Wattmeter Calibration)
SET/RESP format: WMpnnn; where: p is the power class (L = low range, H = high range,
X = mW/transverter range) and nnn is the calibration value (default in all three cases is

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