Mini-Module Kits


Our new line of easy-to-build, high-performance mini-module kits are inexpensive, ideal for first-time builders, and will serve many useful functions in your shack and at your electronics workbench. They can be built in a single evening, and include complete, illustrated assembly manuals.

The mini-modules include a two receiver test oscillators, (XG1 and XG2), a Two Tone IMD test generator (2T-gen), a wideband noise generator (N-gen), 20-watt dummy load (DL1), and 150-watt balun (BL1), 250W 1:1/4:1 Balun (BL2) and directional coupler (CP1). All are small, PC-board-only modules that can be used as is--with the supplied rubber feet--or installed in an enclosure of your choice. 

Each module includes a PC board-mount BNC connector to facilitate connection to station equipment. The dummy load and balun are only about 1.5 x 3"--ideal for portable or home use. (They'll even fit side-by-side directly on the KAT2 antenna tuner's dual antenna jacks.) The N-gen, DL1 and BL1 are further described below. 

Additional mini-module kits will be announced in coming months. 

W1 140W Computing Wattmeter and SWR Bridge

The Elecraft W1 is a versatile microprocessor based RF power and SWR meter than can be used with any transmitter from QRP levels to 140 watts output from 1.8 to 30 MHz. The W1 automatically selects the proper power range of up to 1.4, 14 or 140 watts and indicates the peak forward power and SWR on built in bar-graph LEDs.

High resolution power and SWR readings are also available through a connector as RS232 serial data for display on a computer. (This interface uses a simplified RS-232 style interface that can drive short cables of less than six feet or directly to a USB adapter.) Elecraft will also be supplying a W1 compatible USB adapter as an option for the W1. The LEDs can be turned off under computer control for use as a dedicated remote computer read Wattmeter / SWR Bridge.

The W1 designed to be used as a stand-alone unit. Optionally, it may be built into existing equipment or an enclosure of your choice. (Battery and BNC connectors can be mounted on the rear of the PCB.)


  • Power Measurement Ranges (Auto-ranging):
    • 150 mW to 1.4 W
    • 1.5 W to 14 W
    • 15W to 140 W
  • SWR Range: 1.1 to greater than 5:1
  • Frequency Range: 1.8 – 30 MHz
  • Computer readable via modified RS-232 or optional USB Computer Interface. (Free VB6 Program.)
  • Accuracy: 0.5 dB typical.
  • Dimensions: 5-3/8” x 2-11/16” (13.7 cm x 6.8 cm)
  • Power: 9V battery or external 12 to 14 VDC


W1 Software Download Page (Includes VB6 Source)

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W1 Assembled 640.jpg (111588 bytes)

AF1 Active Filter with Audio Amplifier

The Elecraft AF1 is a versatile audio filter that can be used with any receiver or transceiver. It can improve intelligibility of CW, phone, or data signals, and is especially well suited to radios that have inadequate I.F. or audio filtering. The AF1 uses straightforward analog circuitry and no surface-mount components, so it’s an ideal project for first-time kit builders.

A rotary switch on the unit allows you to select a low-pass characteristic with adjustable upper frequency roll-off, or a narrow bandpass characteristic. The bandpass filter offers two levels of selectivity, and its center frequency may be tuned from about 350 Hz to about 950 Hz. The low-pass filter is active during bandpass operation, allowing you to further control the upper frequency response. The output amplifier drives low impedance phones or a small loudspeaker. Power can be supplied via either an on-board 9-V battery or an external supply. An LED indicates power on/off status.


  • Filters: Variable Cutoff Low pass filter (SSB/CW) plus two levels of narrow CW bandpass filtering with tunable center frequency.
  • Built-in audio amplifier with volume control.
  • Dimensions: 5-1/2” L x 2-7/8” W x 7/8” H (14 cm x 7.3 cm x 2.2 cm). Height not including feet or knobs
  • Power: 9V battery or external 12 to 14 VDC


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AT1 41 dB HF/VHF Switched Attenuator

The Elecraft AT1 is a versatile and accurate HF/VHF step attenuator that permits selecting any level of attenuation between 0 and 41 dB in 1 dB steps. The AT1 features an unusually high upper power limit of 2 watts, making it ideal for many applications where attenuators with a lower power rating cannot be used such as at the output of a QRP transmitter for QRPp experimentation.

The AT1 step attenuator is designed to be used as a standalone unit. Optionally, it may be built into existing equipment or an enclosure of your choice.


  • Range: 0 to 41 dB in 1 dB steps
  • Power Handling: 2 W (continuous duty)
  • Accuracy: Below 50 MHz: ± 0.25+0.01(A) dB, 54 to 220 MHz: ± 0.50+0.01(A) dB (Where A is the attenuation in dB.)
    Dimensions: 5-3/8” x 2-11/16” (13.7 cm x 6.8 cm)
    No power source required


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AT1 Completed_640.jpg (53134 bytes)

2T-gen 2-Tone Test Oscillator

How do you know how clean your HF SSB transmitter or amplifier is? One of the most important performance measurements is Transmit Intermodulation Distortion (IMD). 

Elecraft's new 2T-gen is a 2-tone test oscillator that has been designed to provide a standard 2-tone (700 and 1900 Hz) audio source for testing of SSB transceivers and linear amplifiers. This type of testing is almost universally used as a measure of transmitter linearity for amateur radio equipment. (Linearity impacts both SSB fidelity and the amount of SSB splatter that causes adjacent channel interference.) Results of 2-tone IMD tests can be found in every ARRL review of new transceivers and power amplifiers. 

The 2T-gen is battery operated and provides sufficient output level (0-200 mV) to be connected directly to the microphone connector of almost any transceiver. Transmitter linearity can be determined by observing the 2-tone envelope on an oscilloscope or station monitor. For more exacting IMD measurements the output can be measured using a spectrum analyzer.

For the 2T-gen, F1 is 700 Hz and F2 is 1900 Hz, which results in a 3rd order product of 3100 Hz and a 5th order product of 4300 Hz. The amplitude of these undesired outputs is usually increased as the transmitter output is increased, and is caused by various transmitter amplifier stages beginning to operate in compression.

Like our other low cost mini-modules, the 2T-gen is quite small: the PC board is just 2.5"W by 3.5"L. Rubber feet are also included so the unit can be used on the workbench.

See the CP1 Directional Coupler below for an excellent 2T-Gen accessory.


  • AF Output Level 200 mV max, adjustable, female RCA connector

  • Frequency 700 Hz and 1900 Hz

  • Harmonic Distortion -55 dB typical

  • Current Drain About 3ma. from on-board 9-V battery

  • Size PC board: 3.5"L x 2.4"W; 1.0"H




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BL2  Wideband 1:1 & 4:1 (Switchable) 250W Balun

BL2 Balun: Our highly-efficient balun can handle up to 250 watts and can handle 1:1 and 4:1 ratios via an on board switch. It  is very small (just 1.5 x 3") and lightweight, making it an excellent choice for both home and field use. It uses a special winding technique to reduce losses and extend the useful range, resulting in an SWR of less than 1.2:1 from 500 kHz to 55 MHz (200-ohm load). It includes rugged screw terminals for the balanced output as well as ground, and can be used in a variety of matching applications.


  • Power Rating: 250 Watts

  • Bandwidth: Input VSWR less than 1.2 when connected to a 200 resistive load, 500 kHz to 55 MHz.


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CP1 Directional Coupler

The CP1 is a dual directional coupler that provides high directivity, can be internally or externally terminated and can be constructed with a coupling loss of either 20 dB or 30 dB. It can be used to sample a transmitter's forward power and reflected power output. As an example the forward power port can be connected to an oscilloscope for display of the transmit envelope. It is an ideal companion to the 2T-Gen 2 Tone test generator. For more advanced applications is can be used with a spectrum analyzer and tracking generator to sweep the return loss (SWR) of an antenna or other device in real time over a frequency range.


  • Frequency Range: 1 MHz to 30 MHz

  • Coupling Loss: 20 dB or 30 dB (29.8) +/- 0.25 dB

  • Directivity: 30 dB

  • Power Rating: 30 dB coupler, 250 W; 20 dB coupler, 25 W


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DL1 Wideband 20W Dummy Load

The DL! dummy load can handle a full 20 watts (continuous) and more intermittently. Its SWR is less than 1.3:1 through 225 MHz. It includes an integral RF detector for use with a voltmeter, allowing you to accurately calculate transmit power.


  • Power Rating: 20 watts maximum; 50% duty cycle.
  • Bandwidth: Input VSWR less than 1.1, 0 to 30 MHz,  1.2, 0 to 144 MHz, 1.3, 0 to 225 MHz
  • Power Measurement Accuracy: 10%, typical, 1 watt to 20 watts

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N-gen Wideband Noise Generator.(100 kHz - 500 MHz)

The Elecraft N-gen is a wideband noise source that is useful for a variety of receiver alignment tasks. It can be used in conjunction with a software program such as Spectrogram to align IF filters in the K2 or in other receivers. It can also be used to align the RF stages in Elecraft XV Transverters or other HF, VHF, and UHF equipment. Note: The N-gen does not generate repetitive pulse noise, so it cannot be used to test pulse-type I.F. noise blankers such as the Elecraft KNB1 or KNB2.

The N-gen can be powered either from its internal 9-Volt battery, or from an external source. A red LED is provided to indicate that the unit is operating.


  • Power Requirement: 9V battery or external 12 to 15 volts DC
  • Current Consumption:  approximately 25 ma.
  • Excess noise output:  approximately 35 dB
  • Bandwidth: within 3 dB from 100 kHz to 500 MHz

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App Note: How to align the K2's crystal filters with a noise generator and Spectrogram

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XG50 Kit Simple 49.380 MHz Signal Source

The Elecraft XG50 Kit  is a simple 49.380 MHz signal source specifically designed for use with the KX3 Extended VFO Temperature Compensation Procedure. Powered from a 12VDC source, the XG50 Kit produces a stable -36 dBm signal.


  • RF Output Level: 10 mv p-p (-36 dBm) into 50 ohms
  • Frequency: 49.380 MHz, ±5ppm
  • Stability: Approximately ± 2 Hz
  • Current Drain: Less than 25 ma @ 12 VDC
  • Operating Voltage: 8 - 15 VDC
  • Size PC board: 2.5"L x 1"W; 3.3"L including BNC connector


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XG2 Three Band Receiver Test Oscillator / S-Meter Calibrator

Elecraft's new XG2 Three Band Receiver Test Oscillator expands our original XG1 to three popular bands: 80, 40 and 20M. The XG2 is a fixed-frequency signal source with switch selectable oscillator frequencies on 80, 40 and 20M. Its highly-accurate precision low-level crystal oscillator generates 1 microvolt and 50 microvolt output levels with an absolute output accuracy of better than +/- 2 dB, and an extremely small unit-to-unit variation of typically +/- 1 dB. This ensures that measurements made with different XG2s are consistent, which can be helpful when evaluating used equipment found at flea markets or on the web. 

The 1-microvolt level can be used to determine a receiver's MDS (minimum discernable signal), as well as its overall receive gain. 50 microvolts is widely used as the standard "S9" reference, so this level can be used for S-meter calibration. Step-by-step procedures are included for receiver performance measurement and S-meter alignment. In addition to receiver testing, the XG2 can be used as a reference to calibrate other lab instruments.

The XG2 also includes an on-board 3-Volt battery (standard coin cell) and a low current power-on LED. The XG2 typically draws 250 uA, resulting in an estimated battery life of 850 hours. The unit is protected against brief accidental transmit, and has been tested at up to 10 watts for 2 seconds. 

The XG2 can be set to operate on 3.579.5, 7.040 and 14.060 MHz. It also provides reduced output levels at harmonics of these operating frequencies, so it can be used for receiver alignment and qualitative tests on or near most HF ham bands. 

Like Elecraft's other low cost mini-modules, the XG2 is quite small: the PC board is just 1.5"W by 3.5"L. You can use a BNC male-to-male adapter such as Elecraft model BNC-MM to eliminate the coax cable and directly connect the XG2 to the back of a receiver or transceiver. Rubber feet are also included so the unit can be used on the workbench.


  • RF Output Level: 1 µV (-107 dBm) and 50 µV (-73 dBm) into 50 ohms

  • Output Accuracy: Typically Better than +/-2 dB at 25 deg. C

  • Frequencies: 3.579.5, 7.040 and 14.060 MHz; Switch Selectable

  • Reverse Protection: 5 watts for 4 seconds,10 watts for 2 seconds (typical; not guaranteed)

  • Current Drain: About 250 uA (typ.) from on-board 3-V,220 mA-hr battery (est. life 850 hours)




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Click on pictures to enlarge.

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Male-Male BNC Connector  

This double-male BNC adapter can be used to connect our mini-modules directly to transceivers or other equipment, providing minimum-loss, high-reliability connections.

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