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The K1-A compact, high-performance CW rig that you can build

NEW: ready built aivalable from QRPproject

HF operation is more fun than ever these days--five watts is all you need to work worldwide DX. That's why we've packed up to four bands into our affordable, easy-to-build K1-4 transceiver. The new four-band K1-4 covers 40, 30, 20, and either 17 or 15 meters. (All band parts are supplied with the kit and 17 or 15M are chosen as the last band at build time.) You can also upgrade the K1-2 to a K1-4 by purchasing the four-band KFL1-4 module and replacing the KFL1-2 in your original K1-2. Combining a K1-4 with an extra KFL1-2 band module on 80 + (15 or 17M) gives you all six bands on your K1! Both module types simply plug in to the K1's main board, internally, and you can swap either type in at any time.

“I Can’t Believe It’s a Kit!”

As suggested by the 9-volt battery in the photo, the K1 is small - only 2.2"H x 5.2"W x 5.6"D, and weighs 1.4 pounds. Yet we've included many features you'd expect in a desk-top HF transceiver, including RIT and XIT, full break-in CW, memory keyer, three crystal filter bandwidths, configuration menu, speaker, and digital display. The K1 is styled to match our all-band K2 transceiver, with the same “look and feel,” attention to detail, and operating Mojo you'd expect from Elecraft.

An HF radio you'll never leave at home

Looking for adventure? With its low receive-mode current drain of under 60 mA, the K1 is a natural for portable operation. Add the internal battery (KBT1) and internal auto-tuner (KAT1) to create a true, all-in-one-box station! Hikers will appreciate our unique Wide-Range Tilt Stand (model KTS1), which supports the radio at any desired viewing angle. (Photo shows ground mount configuration.)

Ideal for first-time kit builders

We use only through-hole components in the K1 to make construction and testing a breeze. And our wireless design methodology eliminates nearly all point-to-point wiring. Finally, the front panel and filter boards plug directly into the RF board to form a clean, rugged assembly. You'll be tempted to leave the cover off to admire your work!

You also won't need a lab-full of test gear to align the K1. It includes a built-in digital voltmeter, wattmeter, and frequency counter.

Comprehensive Assembly Manual

You'll find the K1 manual easy to follow, with step-by-step assembly, clear illustrations and photos, and modular checkout of each major section. There's also a detailed theory of operation section, as well as a complete troubleshooting guide.

Strong Customer Support for Europe from QRPproject in Berlin, Germany. Our technical support via telephone and the Internet will get your Elecraft K1 up and running quickly. On-line manuals, frequently asked questions (FAQ), application notes and our user group e-mail list make building the K1 a great experience.

K1 Options

KFL1-2 Additional 2-Band Filter Module:

The original KFL1-2 gives you two bands of your choice (80, 40, 30, 20, 17, or 15 M). Combining the KFL1-2 with a K1-4 gives you all six of these bands. Swapping band modules takes only a couple of minutes, even with the antenna tuner and/or internal battery installed

KNB1 Noise Blanker

The KNB1 reduces impulse noise including noise from automobile ignition and noisy power lines

KAT1 Internal Automatic Antenna Tuner . The KAT1 packs a fully-automatic tuner into a small module that plugs directly into the K1's Filter board, with no wiring. It allows you to connect most end-fed, random length antennas directly to the K1's antenna jack--even with no feed line. Also works with coax-fed antennas

KBT1 Internal Battery Adapter

Ideal for those who like to travel light, the KBT1 packs 8 AA cells into your K1 and still leaves room for the ATU, noise blanker, and speaker. You can operate for 5 to 10 hours at the 2-3 watt level using either NiMH or Alkaline cells

KTS1 Wide Range Tilt Stand

The KTS1 allows you to set the K1 on nearly any rough or irregular surface and aim the front panel upwards for easy operation. You can also attach a lightweight keyer paddle directly to the stand, eliminating the separate heavy base. Includes short arms for regular desktop use

FDIMP FingerDimple for the K1 and K2


Covers up to 150 kHz of four (K1-4) HF bands. (Your choice of 80, 40, 30, 20, 17 and 15 meters)
Rugged, attractive custom enclosure
Small, portable size. 2.2h x 5.2w x 5.6d inches. 1.4 lb.
Operates on 12 volts nominal (9 V min, 15 V max)
Receive current as low as 55 mA
3 MHz, low-noise analog VFO with 10-turn potentiometer for smooth tuning
BNC antenna connector – a QRP/portable standard

Easy-to-read 3-digit LCD for text and bar-graph
100 Hz frequency display resolution
RIT and XIT for split operation, with dual-color LED status indicator (LED can be disabled for lower current drain.)
Built-in high-sensitivity speaker
Menu system for configuration and calibration; all parameters stored in nonvolatile memory
XIT button can be used as a programmable function button to quickly access an often-used menu entry
Single conversion superhet receiver; 4.915 MHz IF
Receive sensitivity: 0.15 µV (attn. Off, typical.)
Narrow double-tuned bandpass filters
Bar graph S-Meter mode
Switchable attenuator with LED status indicator
Sharp 4-crystal filtering helps prevent receiver overload from signals outside the RX passband
Three programmable filter bandwidths


Adjustable CW power output, nominally 0-5 watts or higher.
Rugged, SWR-protected PA transistor

Harmonics/spurious outputs: better than 40 dBc
Diode-switched full break-in; programmable delay


Built in memory keyer with iambic modes A and B
9 - 50 wpm with int. keyer, > 70 WPM ext. keying
Two 80-byte EEPROM message buffers

Auto-repeat and message chaining
Programmable message repeat interval, 1-250 sec. (longer delays useful for beacons)
Keying jack can be used with a hand key or computer as well as a keyer paddle

The K1-4 uses one Bandpassfilter (BPF) and one Low Pass Filter (LPF) for two bands witch caps switched by relais to resonate.

Your old K1 can be modified to a K1-4 by purchasing the extra 4-band modul.

For direct access to the QRP-Shop K1-4 page click here 

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