Home

Explore

View Cart

Deals

Saved

Suggested searches

Plant-based protein powders
Vegan leather handbags
Bedroom decor
Waterproof jackets
Hoodies

Learn more about how we use your data to personalize your experience and ads. Recommendations are for informational purposes only.

Elecraft

A photo of the KIO2 RS-232 Serial Interface circuit board with IC chip, capacitors, and DB9 connector, labeled KIO2 rev A.

A photo of the KIO2 RS-232 Serial Interface circuit board with IC chip, capacitors, and DB9 connector, labeled KIO2 rev A.

Elecraft

KIO2_KIO2 RS-232 Serial Interface

4.5 (1,234)

Sold 100+ last 30 days

20% off first order

$99.95

Color

Black

Quantity

Product description loading

Product description loading

This is the product description text that will appear here.

Shopping designed around you.

Start selling

For brands

For creators

Build your store

Information

Shop Pay

Help center

Social

X (Twitter)

Instagram

Legal

Terms of Service

Privacy Policy

Your Privacy Choices

Powered by

|

Start selling for free

Language

© Shopify Inc. 2026

Quantity

1

Description

Introduction You'll be able to do full computer control of the K2 with the KIO2 installed, and you won't need an external level converter, since the KIO2 provides true RS-232 levels. Compatible with most contesting and logging software, as well as our own K2VOICE and K2REMOTE programs. The KIO2 Programmer's Reference provides extensive i...

Delivery & Returns

Elecraft

4.8 (8)

You might also like

Elecraft K160RX circuit board with toroidal coils, relays, and capacitors used in receiver module.

Elecraft

K160RX_K160RX 160M Option

Elecraft K2 transceiver shown front-facing with LCD frequency display, tuning knob, and front panel controls.

Elecraft

K2PK3_K2 PAK 3 (K2, KNB2, KSB2, KAT2) - $75 Package Savings

Elecraft K2 transceiver shown front-facing with LCD frequency display, tuning knob, and front panel controls.

Elecraft

K2PK2_K2 PAK 2 (K2, KNB2, KSB2) -$50 Package Savings

Elecraft KX2 transceiver operating outdoors on a rock with antenna connected; person logs contacts beside hiking gear.

Elecraft

KX2-M_KX2 Transceiver-Assembled, E877035-SIDE KX-KX2 heatsink set compete w/both ends and lexan cover, Install Labor-Labor to install SIDE KX option

Elecraft

KX3 Transceiver

A clear plastic package containing a mini banana plug, labeled with 'KX2GNDPLUG' and a barcode.

Elecraft

KX2GNDPLUG_Mini Banana Plug for the KX2 and AX3

SPOOLTENNA

SPOOLTENNA

5

(33)

Elecraft KX3 transceiver with KXPD3 paddle attached beneath front panel; paddle sold separately from the radio unit.

Elecraft

KX3-K_KX3 160-6M Transceiver, Kit

K-POD external tuning controller with large rotary knob and programmable buttons.

Elecraft

K-Pod_K-Pod Control Panel for the K4/K4/0/K3S/K3

Elecraft KPA500 amplifier and KAT500 antenna tuner shown side by side with front panel displays and controls.

3% off

Elecraft

KPA500/KAT500 PowerCombo-F

$4,639.90$4,764.90

Elecraft KXAT2 automatic antenna tuner circuit board with relays, toroidal inductors, and power connector.

Elecraft

KXAT2_KX2 Antenna Tuner (Kit)

Top view of Elecraft KAT500 Antenna Tuner with cover removed revealing internal circuit board, relays, toroidal inductors, and internal components.

Elecraft

KAT500-K_KAT500-K High Power ATU, Kit

KXIBC2 printed circuit board with mounted chips, resistors, connectors, and visible labeling.

Elecraft

KXIBC2 KX2 Internal Battery Charger, Kit

Elecraft

K144RFLK_K144XV Reference Lock Board, Kit [Sales]

Elecraft KX3 transceiver and PX3 panadapter shown connected, with color spectrum display and front panel controls visible. KXPD3 Paddle shown connected to KX3

5% off

Elecraft

PX3-F_PX3 Panadapter Factory Assembled, $50 Discount

(1)

Elecraft KAT2 20W internal automatic antenna tuner circuit board with toroidal coils and RF components.

Elecraft

KAT2_KAT2 20W Internal ATU

Front view of Elecraft K2 HF transceiver with LCD display, tuning knob, controls, and fold-down stand.

Elecraft

K2 Transceiver Kit

“No image available” placeholder graphic displayed.

Elecraft

KXV3B_KXV3B Transverter Interface upgrade for earlier K3 radios

Modern Morse

4.5

(12)

KXPACBL cable set including KXPA100 to KX3 control cable, CAT6 interface, RF BNC to PL-259, and power cable with APP connector.

Elecraft

KXPACBL_KXPACBL, KXPA100 Integrated Cable

KXIBC2 printed circuit board with electronic components, labeled test points, and two attached lead wires.

Elecraft

KXIBC2-F_ KX2 Internal Battery Charger, Installed

AC power adapter with two-prong plug and inline power brick, ending in a DC barrel connector cable.

Elecraft

KXBC2_External Lithium-ion Fast Charger for KXBT2

Front view of Elecraft K4D-F HF transceiver with color display showing frequency readouts and dual spectrum waterfall graphs.

Elecraft

K4D-F_K4D Transceiver, Factory Assembled

Elecraft PR6-10 preamp with RF connectors and power leads.

Elecraft

PR6-10 AMP

Elecraft KHPD1 paddle shown installed on KH1 with control labels, knobs, and headphone icon visible.

Elecraft

KHPD1_KH1 Keyer Paddle

Diagram of 39-inch cable with connector splitting to MiniDIN male and MiniDIN female connectors on opposite ends.

Elecraft

KXFT817CBL_KXPA100 Interface Cable

Graphic showing Elecraft KPA500 amplifier and KAT500 antenna tuner with visible front panel indicators and controls.

Elecraft

KPA500 & KAT500 Power Combo (NOTE: Select 1 PWR Cable Below) $75 Package Savings

Top view of Elecraft KAT500 Antenna Tuner with cover removed revealing internal circuit board, relays, toroidal inductors, and internal components.

Elecraft

KAT500-F_KAT500-F High Power ATU

Radioddity

Radioddity

4.7

(286)

Xiegu G90 HF Radio | SDR | QRP | Auto Antenna Tuner | 20W | Remote Head - Radioddity

Xiegu G90 HF Radio | SDR | QRP | Auto Antenna Tuner | 20W | Remote Head - Radioddity

Radioddity HF-010 Portable HF Antenna | 6-80M | 3.5-50MHz | SWR 1-1.5 | Quick-Tuning - Radioddity

Xiegu DE-19 Data Interface Expansion Adapter | for PC Data Communication | G106 G90 X5105 XPA125B - Radioddity

Radioddity G90-H3 Stand | Heat Dissipation Holder | for Xiegu G90 XPA125B | Wide Compatible | POTA Accessory

Elecraft

KH1-F_KH1 Hand-Held, 5-Band Transceiver, Factory Assembled

Tufteln

Tufteln

Tufteln

4.4

(17)

Elecraft K2 transceiver shown front-facing with LCD frequency display, tuning knob, and front panel controls.

Elecraft

K2PK1_K2 PAK 1 (K2, KNB2) - $35 Package Savings

Elecraft AF1 audio filter circuit board with control knobs, components, and 9V battery installed.

Elecraft

AF1_AF1 Audio Frequency Filter

Front view of Elecraft K4-F HF transceiver with color display showing frequency readouts and dual spectrum waterfall graphs.

Elecraft

K4 Transceiver

Elecraft

W2 WATTMETER

Elecraft

KX2-F_KX2 Transceiver --(KXBT2 Battery sold separately)

(1)

Powerwerx SS-30DV switching power supply with front power switch and output terminals; image labeled “COMBO.”

Elecraft

PWR-SupplyCmbo_SS30DV Power Supply Combo

Front view of Elecraft K4D-F HF transceiver with color display showing frequency readouts and dual spectrum waterfall graphs.

Elecraft

K4D-F/PKG2_K4D-F Package 2 (K4D, KAT4, KPod & MH4), $125 Package Savings

Elecraft directional coupler TX sensor with labeled ports and Ethernet cable coiled beneath the unit.

Elecraft

DCHF-2000a_DCHF-2000a Additional Coupler

Elecraft KX3 transceiver and PX3 panadapter shown connected, with color spectrum display and front panel controls visible. KXPD3 Paddle shown connected to KX3

Elecraft

PX3-K_PX3 Panadapter Kit

HamRadioDuo Store

4.9

(48)

Elecraft KPA1500 amplifier shown front-facing with LCD status display, power and SWR bar meters, and control buttons.

Elecraft

KPA1500-X_1500+ W Solid State Amplifier

Elecraft KXPA100 amplifier shown angled with heat sink fins, LED power and SWR indicators and front panel controls.

Elecraft

KXPA100-F_KXPA100 100 W External Amplifier-Assembled (incl. DC power cable)

KXIBC2 printed circuit board with mounted chips, resistors, connectors, and visible labeling.

Elecraft

KXIBC2 - KXIBC2 KX2 Internal Battery Charger, Kit

Open Elecraft ES80 case holding KX3 transceiver, PX3, and MH3 microphone with AX Line accessories secured in lid straps.

Elecraft

KX3/PX3SHKPK-F_KX3 Shack-in-a-Pack, Assm. - $75 Package Savings

Hand holding populated K2B2 circuit board with coils, capacitors, and ICs, showing detailed RF module assembly.

Elecraft

KSB2_ KSB2 SSB Option for K2

Chameleon Antenna

Chameleon Antenna

4.9

(1.7K)

Two black CHA 34HD reducer sleeve components

limited stock available

Elecraft

K144RFLK_K144XV Reference Lock Board, Kit

Front view of Elecraft KRC2 controller with XCVR, PC, 12VDC, and four function button connections.

Elecraft

KRC2 Band Decoder

Black RS-232 serial cable with DB9 connectors and DB9 gender changer adapter.

Elecraft

KPAK3AUX_KPAK3AUX AUX Cable Set Optional KPA500 or KPA1500 to K3/K3S/K4 & some non-Elecraft radios

Elecraft KXPD2 compact Morse code paddle with dual levers and adjustment knobs for portable CW operation.

Elecraft

KXPD2_KXPD2 Precision Keyer Paddle for KX2 and KX3

Elecraft KX2 transceiver in an open carry case with microphone and battery pack, with closed case shown beside it.

Elecraft

KX2SHKBX-IBC_KX2 Shack-in-a-Box w/KXIBC2 - $50 Package Savings

(2)

Elecraft BL2 circuit board with transformer module, switches, and RF input/output connectors mounted on a green PCB.

Elecraft

BL2_BL2 250W 1:1 & 4:1 (switched) Balun

Elecraft directional coupler TX sensor with labeled ports and Ethernet cable coiled beneath the unit.

Elecraft

DCHF-200a_DCHF-200a Additional 1.8-54 MHz 0.1-200W Coupler

Elecraft KX3 transceiver with KXPD3 paddle attached beneath front panel; paddle sold separately from the radio unit.

Elecraft

KX3-F_KX3 160-6M Transceiver, Factory Assembled

Front view of Elecraft K4-F HF transceiver with color display showing frequency readouts and dual spectrum waterfall graphs.

Elecraft

K4-F_K4 Transceiver, Factory Assembled

g7ufo.radio

g7ufo.radio

5

(20)

Closed view of a black logbook tray attached to KH1 transceiver.

Elecraft

KHLOG1_ KH1 Log Tray

Front view of Elecraft K4D-F HF transceiver with color display showing frequency readouts and dual spectrum waterfall graphs.

Elecraft

K4D-F/PKG1_K4D-F Package 1 (K4D, KAT4 & MH4), $100 Package Savings

Large green circuit board with toroidal coils and relays, labeled KXPA100 ATU module for Elecraft KXPA100 amplifier.

Elecraft

KXAT100-F_KXAT100 Internal 100W ATU (Factory Installed)

Open K2 assembly with circuit board, transformer, wiring, and metal chassis, showing internal components.

Elecraft

KBT2_KBT2 Internal Battery Kit

Elecraft dummy load board labeled “Warning Hot” with resistors and RF input connector for 20 watt testing.

Elecraft

DL1_DL1 20W Dummy Load with RF detector

Elecraft KX2 transceiver operating outdoors on a rock, with notebook, trekking poles, and antenna connection nearby.

Elecraft

KX2 Transceiver

Powerwerx SS-30DV switching power supply with front power switch and output terminals.

Elecraft

SS30DV_SS30DV Compact Switching Power Supply

Elecraft KX2 transceiver in an open carry case with microphone and battery pack, with closed case shown beside it.

Elecraft

ES60_ES60 KX2 Compact Padded Carrying Case

Bioenno Power

4.9

(140)

12volt 12 amp hour LFP battery

K4/0 remote panel shown on a desk, featuring a color display, tuning controls, and front-panel buttons.

Elecraft

K4/0_K4/0 Remote Panel

Batteries America

PB-39H: 9.6v 1450mAh NiMH battery for Kenwood TH-D7, TH-G71 radios, replaces PB-39N

(1)

Elecraft

KXAT2 KX2 Antenna Tuner, Kit

Front view of Elecraft K4/10-F HF transceiver with color display showing frequency readouts and dual spectrum waterfall graphs.

Elecraft

K4/10-F_K4 10W Transceiver, Factory Assembled

Black cable with DB9 connectors on both ends and RJ45 plug, coiled and secured with a twist tie.

Elecraft

CBLP3Y_CBLP3Y KIO3B RJ45 cable (K3/P3 owners need this cable for IO upgrade)

Elecraft K4 transceiver and KPA1500 amplifier shown side by side with front panel displays, meters, and controls.

Elecraft

K4D-F/PKG3_K4D-F/KPA1500 w/Internal ATU Package 3 (K4D, KAT4, K-POD, KPA1500, KPAK3AUX, MH4, SP4x2 & ES100), $400 Package Savings

Open Elecraft ES80 case holding KX3 transceiver, PX3, and MH3 microphone with AX Line accessories secured in lid straps.

Elecraft

KX3/PX3SHKPK-K_KX3 Shack-in-a-Pack, Modular Kit - $75 Package Savings

Elecraft KH1 transceiver shown with KHLOG1 log tray, KHPD1 paddle, and telescoping whip antenna attached.

Elecraft

KH1_KH1 Hand-Held, 5-Band Transceiver

Elecraft

ES100_K4 Carrying Case & Elecraft Luggage Tag

Black USB-to-serial adapter cable with USB-A connector and 9-pin DB9 serial connector.

Elecraft

KUSB_KUSB Serial Adapter Cable

Elecraft KXUSB cable with USB connector and right-angle 3.5 mm plug, coiled with product label attached.

Elecraft

KXUSBa_KXUSB-a Extra Cable - USB RS232 to 3.5mm Cable

DC power cable with right-angle connector and red Powerpole-style connector, shown coiled.

Elecraft

E980262_Power Cable, 3ft, APP to 2.1MM connector

Black audio cable with two yellow RCA male connectors, coiled and secured with a twist tie.

Elecraft

E100416_E100416 Phono cable

Elecraft KXPA100 amplifier shown angled with large heat sink fins and front panel LED indicators and controls.

2% off

Elecraft

KXPA100-AT-F_KXPA100-AT 100W Ext Amp with KXAT100 100W ATU, Factory Assembled, $30 Discount

$1,938.95$1,968.95

Elecraft W2 wattmeter shown front-facing with LED power and SWR bar meters and control buttons.

9% off

Elecraft

W2-A_W2 WATTMETER, Assembled (Select 1 N/C Coupler Below), $50 Discount!

A set of four accessory cables for the Elecraft KX3 radio. Includes transmit audio, receive audio, RX I/Q, and ACC2 module cables.

Elecraft

KX3-PCKT_Accessory Cable Kit for KX3

Manual page showing Elecraft K2 transceiver with heatsink, titled Appendix G, 100-W Stage and RS-232 I/O (K2/100).

Elecraft

E740035_KPA100 Manual

cwmorse.us

4.9

(114)

Front view of Elecraft K4 HF transceiver with color display, tuning knob, control buttons, and dual spectrum waterfall graphs.

Elecraft

K4TOK4DUPG_K4 Upgrade Kit to K4D

Graphic showing Elecraft KPA500 amplifier and KAT500 antenna tuner with visible front panel indicators and controls.

3% off

Elecraft

PWRCOMBO-F_KPA500 & KAT500 Power Combo-$75 Package Savings + $125 Discount

$4,639.90$4,764.90

Large green circuit board with toroidal coils and relays, labeled KXPA100 ATU module for Elecraft KXPA100 amplifier.

Elecraft

KXAT100-K_KXAT100 Internal 100W ATU (Kit)

Elecraft KPA500 amplifier shown angled with LCD display, power and SWR bar meters, and front panel controls.

Elecraft

KPA500-K_KPA500 500w Amplifier, Kit - NOTE: Select 1 PWR Cable Below

Elecraft KX3 transceiver and PX3 panadapter shown connected, with color spectrum display and front panel controls visible. KXPD3 Paddle shown connected to KX3

5% off

Elecraft

PX3 Panadapter

Large green circuit board with toroidal coils and relays, labeled KXPA100 ATU module for Elecraft KXPA100 amplifier.

Elecraft

KXAT100 100W ATU