K1 Two Band HF Transceiver

K1 Option Information

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

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 two bands into our affordable, easy-to-build K1 transceiver. The KFL1-2 two-band module covers your choice of two bands (80, 40, 30 20, 17 and 15 meters available). The module plugs in to the K1's main board, internally, and you can swap in a different KFL1-2 module, with different bands, 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.

Click here for more of what our customers and others say about Elecraft kits. 

QST K1 Review (.pdf, 03/ 2001 issue. ARRL Members Website)


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!


K1 internal pictures.

K1 Backlight Mod Kit (manual, pdf) Picture   

K1 Quick Reference Card (pdf)

K1 Data Sheet (pdf)

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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

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

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KFL1-2  Additional 2-Band Filter Module: 

 Gives you two bands of your choice (80, 40, 30, 20, 17, or 15 M). Swapping band modules takes only a couple of minutes, even with the antenna tuner and/or internal battery installed.

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KNB1 Noise Blanker  

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

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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.

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KBT1 Internal Battery Adapter -Product no longer available.

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.



q      Covers up to 150 kHz of  two HF bands. (Your  choice of 80, 40, 30, 20, 17 and 15 meters)

q      Rugged, attractive custom enclosure

q      Small, portable size. 2.2h x 5.2w x 5.6d inches. 1.4 lb.

q      Operates on 12 volts nominal (9 V min, 15 V max)

q      Receive current as low as 55 mA

q      3 MHz, low-noise analog VFO with 10-turn potentiometer for smooth tuning

q      BNC antenna connector – a QRP/portable standard

q      Easy-to-read 3-digit LCD for text and bar-graph

q      100 Hz frequency display resolution

q      RIT and XIT for split operation, with dual-color LED status indicator (LED can be disabled for lower current drain.)

q      Built-in high-sensitivity speaker

q      Menu system for configuration and calibration; all parameters stored in nonvolatile memory

q      XIT button can be used as a programmable function button to quickly access an often-used menu entry




q      Single conversion superhet receiver; 4.915 MHz IF

q      Receive sensitivity: 0.15 µV  (attn. Off, typical.)

q      Narrow double-tuned bandpass filters

q      Bar graph S-Meter mode

q      Switchable attenuator with LED status indicator

q      Sharp 4-crystal filtering helps prevent receiver overload from signals outside the RX passband

q      Three programmable filter bandwidths




q      Adjustable CW power output, nominally 0-5 watts or higher.

q      Rugged, SWR-protected PA transistor

q      Harmonics/spurious outputs: better than –40 dBc

q      Diode-switched full break-in; programmable delay




q      Built in memory keyer with iambic modes A and B

q      9 – 50 wpm with int. keyer, > 70 WPM ext. keying

q      Two 80-byte EEPROM message buffers

q      Auto-repeat and message chaining

q      Programmable message repeat interval, 1-250 sec. (longer delays useful for beacons)

q      Keying jack can be used with a hand key or computer as well as a keyer paddle



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