Instruction Manual

ELECRAFT K4
HIGH-PERFORMANCE DIRECT SAMPLING SDR
125 Westridge Drive, Watsonville, CA 95076 | 831-763-4211 | Fax: [phone] | [e-mail] | elecraft.com
1974/10-18-21/
Modular hybrid architecture
—
Next-generation features,
operating convenience, and style
K4 Rear Panel
K4 Accessories
Dual Internal PA Fans
Advanced Digital I/O:
Ethernet, USB, 4K Video
Output
Antenna 1, 2, 3
160-6 m
Antenna 4
VHF/UHF*
Ground Wingnut
External Amp
RF Sample Input*
Full Set of Analog and Control Ports
for Station Compatibility
KPA1500 Amplier: 160-6 m full-legal-limit amp
with silent PIN-diode QSK and built-in wide-range
ATU. Matches K4 size and styling.
SP4 Speaker: Hi-delity external speaker with A/B
source selection. One or two SP4s can be directly
driven by the K4 or other transceivers.
K-Pod Controller: Includes a precision, 400-step
optical encoder for use as VFO A, VFO B, or RIT/
XIT oset, plus 8 dual-function programmable
switches. Can be directly connected to any K4
USB-A jack.
Models
(K4 & K4D upgradeable by the user at any time)
K4: Basic K4 transceiver provides 160-6 m, all-mode coverage; 100 W output; ve receive
RF sources; and wideband dual watch, allowing the main and sub receivers to be set
for the same or dierent bands.
K4D: Adds KRX4 option, with a second set of band-pass lters and additional direct-
sampling ADC module. This allows the two receivers to use dierent antennas – a
requirement for diversity receive. Having two sets of band-pass lters also optimizes
signal handling when the receivers are on dierent bands and/or antennas.
K4HD: Includes all of the above, plus our dual superhet module, the KHDR4. Ideal for
competitive eld day, contesting, and DXpedition stations. Each superhet receive
section includes up to 3 crystal lters. The superhet’s 8 MHz IF has excellent dynamic
range, so additional crystal lters are not required.
K4 Key Specs and Features
Size: 4.5”H x 13.5”W, 10” D
Weight: Approx. 10 lbs
Supply Voltage: 11-15 VDC
Current: ~2 to 3 A RX, 4-25 A TX
Frequency Range: 100 kHz - 54 MHz (VHF/UHF range to be
determined*)
Stablility: +/- 0.1 ppm typ
Modes: CW, SSB, AM, FM, Data
LCD: 7” color; touch & mouse control
Text modes: CW, PSK31/63, RTTY
KAT4 ATU: 10:1+ range; 3 ant. jacks
RX antenna sources: Up to 5
A-to-D Converter(s): 16 bits
I/O: USB-A x3, USB-B (two virtual com ports + audio), RS232 (DE9),
Ethernet, 4K video, front/rear mic, front/rear phones, LINE in/out,
speakers, PTT in, KEY out, paddle, key, ACC,12 V out.
CW QSK: Silent, PIN-diode switched
Other: RX/TX EQ, real-time clock,100% remote control including
panadapter data, remote antenna switch control*, custom in-box
software apps*
* Planned feature or option