Elecraft K3 Owner's Manual - Manual (Page 8)

8
Specifications
Some specifications apply only if the corresponding option modules are installed (see Options, pg. 45).
GENERAL
Frequency Range Main and Sub Receivers, 490 kHz - 30 MHz and 44-54 MHz. Transmitter: Amateur
bands between 1.8 and 54 MHz (varies by country). 144-148 MHz with K144XV
option.
MARS coverage on request (excluding transmit from 7.550-8.999 MHz at 13 W and
higher, and 7.650-8.999 MHz at 12 W or lower).
Tuning Step Sizes 1, 10, 20, and 50 Hz fine steps; user-configurable coarse tuning steps (per-mode).
Direct keypad frequency entry in either MHz or kHz.
Memories 100 general purpose, plus 4 scratch-pad memories per band
Frequency Stability +/- 5 ppm (0-50 C) TCXO standard; +/- 1 ppm TCXO opt. (+/- 0.5 PPM typ., 0-50 C).
K3EXREF option locks TCXO to an external 10-MHz reference (+/- 1 to 2 Hz typ.).
Antenna Jacks 50 ohms nominal. One SO-239 supplied (2nd SO-239 jack supplied with KAT3 ATU).
BNC jacks for RX antenna in/out and transverter in/out (KXV3 Option).
Modes USB, LSB, AM, FM, CW, DATA (FSK D [direct], AFSK A [Audio], PSK D [Direct]
and DATA A [Audio]; PSK). Built in PSK, RTTY, and CW text decode/display.
VFOs Dual VFOs (A and B) with separate weighted tuning knobs
Remote Control Port EIA-232 standard DE-9F; USB adapter option. Full control of all radio functions.
Audio I/O Line-level isolated TX/RX audio interface (stereo outputs); front (1/4”) and rear (1/8”)
stereo headphone jacks; stereo speaker jack.
Transverter Interface Transmit, 0 dBm typ.; BNC in/out connectors on KXV3 option module. KXV3A
(updated KXV3) includes connectors for K144XV internal 2-meter module.
Buffered IF output BNC connector (KXV3 Option); see pg. 39 for interface recommendations.
Other I/O Key/Keyer/Computer, Paddle, PTT In, and KEY Out. Band information output via
binary interface and AUXBUS on ACC connector.
Real-Time Clock/Calendar Accuracy: Approx. +/- 20 ppm (+/- 2 seconds/day). U.S. and E.U. date formats.
Battery: 3 V coin cell (see pg. 48 for replacement instructions).
Supply Voltage
and Current 13.8 V nominal (11 V min, 15 V max). 17-22 A typical in TX for K3/100, 3-4 A
typical in TX for K3/10. 0.9A typical RX (less sub receiver). When using reduced
supply voltage (< 12 V), power output should be reduced (e.g. 70 W at 11 V).
Recommended supply: 13.8VDC @ 25A, continuous duty for K3/100; 13.8VDC @
6A for K3/10. For best results, use the supplied 5 foot (1.53 m) power cable. When a
battery is used, both sides of the battery cable should be protected by fast-blow fuses.
Accessory DC output Switched, 0.5 A max; 13 V no-load, 12 V max load (@ Vsupply = 13.8 V)
Weight (K3/100) Approx. 8.5 lbs. (3.8 kg). With KRX3 sub receiver option, 9.5 lbs. (4.3 kg).
Size Enclosure only, 4.0 x 10.7 x 10.0 in., HWD (10.2 x 27.2 x 25.4 cm). With projections,
4.4 x 11.1 x 11.8 in. (11.2 x 28.2 x 30.0 cm).