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W1 140W Computing Wattmeter and SWR Bridge (previously called WM1)
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.)
Specifications
- 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
Manual
W1
Software Download Page (Includes VB6 Source)
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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 its 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.
Specifications
- 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
Manual
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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.
Specifications
- 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
Manual
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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.
Specifications
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AF Output Level
200 mV max, adjustable, female RCA connector
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Frequency 700 Hz
and 1900 Hz
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Harmonic
Distortion -55 dB typical
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Current Drain
About 3ma. from on-board 9-V battery
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Size PC board:
3.5"L x 2.4"W; 1.0"H
Manual Order
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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.
Specifications
Power
Rating: 250 Watts
Bandwidth: Input VSWR
less than 1.2 when connected to a 200 resistive load, 500 kHz to 55
MHz.
Manual
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List
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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.
Specifications
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Frequency Range: 1 MHz to 30
MHz
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Coupling Loss: 20 dB or 30 dB
(29.8) +/- 0.25 dB
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Directivity: 30 dB
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Power Rating: 30 dB coupler,
250 W; 20 dB coupler, 25 W
Manual
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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.
Specifications
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Power Rating: 20 watts maximum; 50% duty cycle.
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Bandwidth: Input VSWR less than 1.1, 0 to 30 MHz, 1.2, 0 to 144 MHz,
1.3, 0 to 225 MHz
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Power Measurement Accuracy: 10%, typical, 1 watt to 20 watts
Manual
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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.
Specifications
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Power Requirement: 9V battery or external 12 to 15 volts DC
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Current Consumption: approximately 25 ma.
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Excess noise output: approximately 35 dB
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Bandwidth: within 3 dB from 100 kHz to 500 MHz
Manual
Order / Price
List
App Note: How
to align the K2's crystal filters with a noise generator and Spectrogram
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XG1 Receiver Test Oscillator / S-Meter Calibrator
Ever wonder how well an HF receiver is really working--or how one receiver
compares to another? One of the most important performance measurements is
sensitivity. But measuring sensitivity (MDS or signal-to-noise ratio) usually
requires an expensive, lab-grade signal generator.
The XG1 Receiver Test Oscillator is an inexpensive alternative. The XG1 is a fixed-frequency (7.040 MHz) signal source with highly-accurate 1
microvolt and 50 microvolt output levels. Thanks to its precision, low-level
crystal oscillator, the XG1 achieves 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 XG1s can be compared, 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.
Additional features of the XG1 include an on-board 3-Volt battery (standard coin
cell), low-battery LED (yellow), power-on LED (green), and reverse-transmit
warning LED (red). The unit is diode-protected against brief accidental
transmit, and has been tested at up to 10 watts for 2 seconds. However, the
provided test procedures include warnings about disconnecting the key, mic, etc.,
so accidental transmit into the XG1 is very unlikely.
An output frequency of 7040 kHz was selected because nearly all multi-band HF
transceivers, as well as many monoband transceivers, cover the 40 meter CW band.
But the XG1 also provides reduced output levels at harmonics of 7040 kHz, so it
can be used for receiver alignment and qualitative tests on 20, 15, and 10
meters.
Since the oscillator's output is only about 10 nanowatts, the unit requires no
enclosure and no interstage shielding. Careful PC board layout and component
selection ensure that RF leakage is virtually eliminated.
Like the other mini-modules, the XG1 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 our model BNC-MM to
eliminate the coax cable and directly connect the XG1 to the back of a receiver
or transceiver. Rubber feet are also included so the unit can be used on the workbench.
Specifications
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RF Output Level: 1 µV
(-107 dBm) and 50 µV (-73 dBm) into 50 ohms
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Output Accuracy:
Typically Better than +/-2 dB at 25 deg. C
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Frequency: 7040.0 kHz
(+/-200 Hz at 25 deg.C before optional calibration)
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Reverse Protection: 5
watts for 4 seconds,10 watts for 2 seconds (typical; not guaranteed)
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Current Drain: About 2.5
mA from on-board 3-V,220 mA-hr battery (est. life 80 hours)
Manual
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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 20MK. 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.
Specifications
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RF Output Level: 1 µV
(-107 dBm) and 50 µV (-73 dBm) into 50 ohms
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Output Accuracy:
Typically Better than +/-2 dB at 25 deg. C
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Frequencies: 3.579.5, 7.040 and 14.060
MHz; Switch Selectable
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Reverse Protection: 5
watts for 4 seconds,10 watts for 2 seconds (typical; not guaranteed)
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Current Drain: About 250
uA (typ.) from on-board 3-V,220 mA-hr battery (est. life 850 hours)
Manual
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