Introduction

The KX3 2 Meter option adds a new band to the KX3 band stack for operation at 144 Mhz. Consisting of a board and a separate SMA antenna connection, it can be installed in any KX3.

The KX3's all-mode operation is available when it is installed. This includes all functions needed to operate the KX3 on FM repeaters, Digital Modes, CW and phone modes.

Overview

For FM repeaters, you can use the built-in 100 memories to scan repeaters. You can program the KX3 repeater offsets, PL tones with the Elecraft Memory Editor, free for download from the Elecraft web site, too.

If you're serious about operating 2 meters on any mode other than FM, be sure to get the XG50 signal source and run the Temperature Compensation Procedure, also found on our web site.

Specs

RECEIVER

MDS - 144 dBm, typical, at 500 Hz bandwidth
Frequency Range: 120 MHz – 150 MHz, typical, with reduced sensitivity outside of 144-148 MHz

TRANSMITTER

Frequency Range: 144 MHz – 148 MHz
Output Power:

2.5 W Minimum with 13.8 Vdc supply (2.5 to 3 watts typical)
2 W Maximum with 11 Vdc supply
1.5 W Maximum with 9 Vdc supply

Additional Features

Power Consumption: 120 mA receive, squelch open, typical , in addition to the normal KX3 current demand whenever the 2 meter is selected
Sleep Mode can reduce the overall radio current to about 150 - 180 mA in FM Mode (squelched)
Max: 1.7 A at 3W output , total radio current , typical for the KX3 when transmitting

Accessories

SMA-RA: A right angle adapter with SMA connections on both ends.
SMA-BNC: An adapter to connect BNC coax to the SMA connector for the KX3-2M

Reviews

KX3 2M/4M option Product Review on eHam.net

FAQ

Q: What is the exact product that I need to order to get the right 2M option kit for my KX3?

A: You will be ordering the right kit of parts based on what you currently have installed in your KX3. Here's what you need to order:

Order this product	If you have this in your KX3
KX3-2M-AT	The KXAT3 internal automatic antenna tuner.
KX3-2M-NOATU	Do NOT have the KXAT3 internal automatic antenna tuner

Q: Does the KX3-2M board use the same antenna port that I use for the other bands?

A: No. The KX3-2M option will have its own antenna port. It is an SMA type connector found on many popular 2M handhelds so there are a lot of options for antennas you can use. Elecraft also has a number of adapters for SMA connections. See the Accessories section for details.

Manuals & Downloads

KX3-2m/4M Installation and Operating Manual

Title	Manual	Revision	Download Size
KAT500 Owners Manual	KAT500 Owners Manual	Rev D1 (8/30/19)	4.2 Mb
KAT500 Serial Command Reference	Elecraft KAT500 Automatic Antenna Tuner Serial Command Reference	Ver. 02.012 (9/14/2023)	507Kb

KAT500 Fully Automatic Tuner Manuals