The KX3 was released in 2012. In radio years, that's ancient. The IC-705 exists now. The X6100 is cheaper. The KX2 is smaller. Xiegu keeps releasing new models every 18 months.

And yet. The KX3 remains the radio that serious QRP operators compare everything against. There's a reason.

I bought mine used in 2021 for about $900 with the internal tuner and roofing filters installed. It's been my primary portable radio since then — POTA, SOTA, Field Day, hotel room DXing, and occasionally my main shack radio when the IC-7300 is being used for something else.

What Makes It Special

The receiver. This is a $1,500 receiver with a transmitter attached. Close-in dynamic range and selectivity rival desktop rigs costing three times as much. During contests, when the band is wall-to-wall signals 500 Hz apart, the KX3 lets you pull out individual stations like they're in separate rooms.

The continuously variable crystal filter — adjustable from 50 Hz to 4 kHz in real-time with a knob — is something no other portable radio offers. You don't pick preset bandwidths. You dial in exactly what you need for the current situation. Narrow CW in a pileup? 200 Hz. Comfortable SSB ragchew? 2.4 kHz. Wide AM reception? 4 kHz. One knob.

The audio. Both RX and TX. I consistently work stations who comment that my audio sounds "full" and "broadcast quality" on SSB — from 10 watts into a wire antenna. The transmit DSP and mic equalization are excellent.

On receive, the built-in speaker is adequate for portable use. Through headphones, it's genuinely enjoyable to listen to for hours.

CW performance. If you're a CW operator, this is the radio. Full break-in QSK (relay-less), adjustable sidetone, built-in keyer and memory, and that variable-width filter for pulling weak signals out of the noise. The CW experience on the KX3 is better than many desktop HF rigs.

The ergonomics. Every function you use regularly is one or two button presses away. No menu diving for common adjustments. Band change, filter width, AF/RF gain, noise reduction — all accessible without taking your hand off the radio. Elecraft's interface design philosophy is "the operator's hands should never leave the front panel."

Where It Shows Its Age

No waterfall. The panadapter display is tiny and primitive — a basic spectrum scope on a small portion of the LCD. You can add an external SDR panadapter, but that adds bulk and cost. The IC-705's color waterfall is in another league visually.

10 watts max. Stock is 10W on all bands, 12W on some. You can get a KXPA100 amplifier that mates to it for 100W — but the combined package is $1,800+ and defeats the portability advantage.

The price. A new KX3 with options (internal tuner, roofing filters, 2m module) runs about $1,800-2,000. For a QRP radio. You can buy an IC-7300 for less. The value proposition only makes sense if you need exactly what the KX3 does — which is be the best portable HF radio, period.

Build quality concerns. The chassis is sturdy, but the connectors (particularly the headphone jack and mic connector) are the weak points. Mine developed an intermittent headphone connection after two years of field use. Fixable, but annoying.

No FM, no D-STAR, no digital voice. If you want VHF FM repeaters, you need the optional 2m module (SSB/CW only, no FM without a mod), or bring a separate radio.

KX3 vs IC-705

This is the comparison everyone asks about. They're not really competing — they serve different operators.

Choose the KX3 if:

  • CW is your primary mode
  • Receiver performance is your top priority
  • You want tactile controls over a touchscreen
  • You don't need a waterfall (or will add an external one)
  • VHF/UHF isn't important
  • You want the lightest weight for backpack portable (KX3 body: 1.4 lbs vs IC-705: 2.2 lbs with battery)

Choose the IC-705 if:

  • You want a color waterfall/spectrum display
  • Built-in battery matters
  • You need VHF/UHF (the 705 covers 2m and 70cm)
  • GPS logging appeals to you
  • D-STAR or digital voice is on your list
  • Touchscreen operation suits your style

The IC-705 is a better all-rounder. The KX3 is a better radio for the specific task of working weak signals on HF in challenging conditions. Different tools.

KX3 vs KX2

Elecraft's own KX2 is smaller, lighter, and cheaper (~$1,100). Why get the KX3 instead?

  • Bigger display
  • Better audio from the larger speaker
  • More controls on the front panel (KX2 requires more multi-function button presses)
  • Higher power option (15W vs 10W, though both are still QRP)
  • Internal battery bay holds more cells

The KX2 is for the ultralight crowd who count every ounce. The KX3 is for operators who want the performance without sacrificing too much usability. If you're doing SOTA summit activations where weight is critical: KX2. Everything else: KX3.

Field Use Reality

POTA activations: KX3 + KXAT internal tuner + 20Ah LiFePO4 + end-fed wire in a tree. Setup time: 15 minutes. Operating time: limited only by my patience and the battery. The internal tuner handles the random impedance of field antennas without complaint.

I've done 47 POTA activations with this setup. Failed to get 10 contacts exactly once (terrible band conditions on a Tuesday afternoon). The radio is never the limiting factor.

SOTA summits: KX3 + internal batteries (8 AA lithium cells) + 20m end-fed halfwave + lightweight whip mast. Total radio + battery weight: about 2.5 lbs. With a CW paddle and a wire antenna, my entire SOTA setup weighs under 5 lbs.

Hotel DXing: KX3 sitting on the desk, headphone cable out the window connected to a 20m wire tossed over a tree or railing. I've worked 5 continents from a Marriott in Nashville running 5 watts. Not efficiently — but the fact that it works at all from hotel power with random wire is the point.

Should You Buy One in 2026?

New? Only if you're a CW-primary operator who prioritizes receiver performance and compact portability above all else, and money isn't the primary constraint.

Used? At $700-900 for a well-equipped used unit, the KX3 is one of the best values in ham radio. These radios hold value because they last — there's no mechanical failure mode that kills them like some rigs. Check that the firmware is updateable and all options are installed.

The KX3 doesn't do everything. It does one thing — high-performance portable/QRP HF — better than anything else you can buy at any price. In 2026, that's still true. When Elecraft eventually releases a successor (the KX4?), the KX3 will still be an excellent radio. Some designs just get it right.