ELECRAFT K3S - Specifications

8
Specifications
Some specifications apply only if the corresponding option modules are installed (see Options, pg. 47).
GENERAL
Frequency Range
Main and Sub Receivers: 100 kHz - 30 MHz and 44-54 MHz (see receiver Sensitivity
spec). Transmitter: Amateur bands between 1.8 and 54 MHz (limits vary by country).
144-148 MHz with K144XV option. 630 m (472 kHz) at ~0.5 mW) with KBPF3A.
Expanded coverage of MARS allocations on request (U.S.).
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.
Frequency Memories
100 general-purpose memories; 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 ant. jack supplied with KAT3A ATU).
BNC jacks for RX antenna in/out and transverter in/out (on supplied KXV3B module).
Modes
USB, LSB, AM, FM, CW, DATA (FSK D [direct], AFSK A [Audio], PSK D [Direct]
and DATA A [Audio]). Built in PSK, RTTY, and CW text decode/display.
VFOs
Dual VFOs (A and B) with separate weighted tuning knobs
Remote Control Port
USB-B port and RS232 port (RJ45 jack plus supplied RJ45 to DE9 adapter). USB port
can also provide line-level audio in/out on the same cable.
Audio I/O
Line-level isolated TX/RX audio interface (mono in, stereo out); front (1/4”) and rear
(1/8”) stereo headphone jacks; stereo speaker jack.
Transverter Interface
Transmit, 0 dBm typ.; XVTR IN/OUT connectors (BNC) on supplied KXV3B
module. KXV3B also includes connectors for K144XV internal 2-meter module.
Buffered IF output
BNC connector (KXV3B); see pg. 41 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. 51 for replacement instructions).
Supply Voltage
and Current
13.8 V nominal (11 V min, 15 V max). 17-22 A typical in TX for K3S/100, 3-4 A
typical in TX for K3S/10. 1.0 A 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 K3S/100; 13.8VDC @
6A for K3S/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, 1.0 A max; 13 V no-load, 12 V max load (@ Vsupply = 13.8 V)
Weight (K3S/100)
Approx. 8.5 lbs. (3.8 kg). With KRX3A 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).