Complete Units

Building Blocks, Complete Units, Boards, most or all construction already completed, only minimal hookup and setup required. Some hand tools and interfacing may be required.
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An assembled 5W HF Amplifier kit compatible with the Ultimate3S transmitter kit, and also for standalone use in homebrew projects
R526.00
Arduino_Shield.jpg
A shield for the arduino range to do wspr and other beacon modes, assembled
R381.00
Arduino_Pro_Mini.jpg
ATMega328p 5V 16MHz Arduino Pro Mini
R80.00
ArduinoNano.jpg
ATmega328P Nano V3 Arduino Controller Board
R80.00
BPF
Band Pass Filter Kit (Assembled)
R198.00
Shack Clock Kit Assembled
R481.00
DS1302_RTC.jpg
DS1302 Real Time Clock Module
R38.00
HF 20W Dummy Load Assembled
R271.00
NokiaLCD.jpg
Graphic LCD 84x48 - Nokia 5110
R78.00
The basic QNC unit is a small box that is inserted in between the main antenna coax from the main antenna and the radio to reduce noise
R1,599.00
KY-040.jpg
KY-040 Rotary Decoder Encoder Module For Arduino AVR
R42.00
LPF
Pluggable (interchangeable) low pass filters for use with QRP transmitters or laboratory instruments, Assembled
R192.00
The Oven Controlled Crystal Oscillator (OCXO) is a very high precision Si5351A frequency synthesiser, assembled
R471.00
PL2303HX.jpg
PL2303HX USB To RS232 TTL Adapter Module
R48.00
Polyphase Network for SDR Receiver Assembled
R321.00
ProgRock is a crystal replacement for those hard-to-get values. Assembled and Tested.
R461.00
Relay Switch Board Assembled and Tested
R421.00
S15351A Frequency Synthesizer Oscillator Assembled and Tested
R255.00
High performance SDR receiver module with I-Q audio output assembled and tested
R641.00
LM2596 DC-DC Adjustable Step Down Power Supply Module
R48.00
5W HF Amplifier (Assembled) (5WPA(A))
Assembled and tested.

This 5Watt HF PA (Linear Amplifier) kit is fully compatible with the Ultimate3S transmitter kit, and also for standalone use in homebrew projects. It has the unique feature of onboard raised cosine envelope shaping for perfect click-free CW. There is a discrete component power modulator with foldback current limiting, adjusted by an 8-bit DAC controlled by the microcontroller to generate the raised cosine envelope shape.

This 5W HF PA kit features an IRF510 MOSFET as the amplifier. But it also includes a discrete component power modulator (like a voltage regulator), which is controlled by an 8-bit Digital to Analogue Converter (DAC). A microcontroller can load a 74HC595 shift register with a sequence of DAC values which closely replicate an ideal raised cosine RF envelope. This makes a very clean CW transmission, practically eliminating key clicks. 

Features:

  • Approx 16dB of gain at HF
  • IRF510 MOSFET PA stage providing 5W or more RF output from 200mW drive (varies by band)
  • Raised-cosine keying envelope generation
  • Option for standalone envelope shaping, without external microprocessor control
  • 80 x 37mm PCB, compatible with Ultimate3S transmitter kit
  • Discrete component power modulator with foldback current limiting
  • Designed for typically 12V or 13.8V operation
  • Large heatsink
  • Supports RD15HVF1 transistor substitution for VHF/UHF operation

The kit is on an 80 x 37mm PCB, the same size as the Ultimate3S transmitter kit and relay-switched filter kit. It can be used with the Ultimate3S transmitter kit. Firmware versions v3.12 and above are capable of generating the raised cosine keying envelope. The connections required for use with the Ultimate3S transmitter kit are described in App Note AN004. Requires Ultimate3S firmware v3.12 and above.

The kit can also be built in a standalone mode, with onboard raised cosine envelope keying generated by an optional ATtiny84 microcontroller. This is plugged into the IC socket on the PCB instead of the 74HC595 shift register chip. The ATtiny84 is programmed to produced the raised cosine RF envelope and also provides a key-out signal which can be used to key a driver stage. This application of the kit is perfect for use in your homebrew transmitter projects. It is described in App Note AN005, which also includes discussion of a 5W CW transmitter built using the QRP Labs VFO kit and this 5W HF PA kit. The programmed ATtiny84 microcontroller is available as an option when purchasing the PA kit

Finally, one or more circuit blocks may be bypassed. A simplified assembly manual details a simplified way to assemble the kit, without using the power modulator and raised cosine keying generator circuits. This may be suitable for people who wish to build a more simple PA that does not include the raised cosine keying facility.

This is a Class-C or D amplifier for CW operation or FSK modes. It is not a Linear for SSB purposes. It might be possible to bias it for Linear operation, this will require some experiment. 

An assembled 5W HF Amplifier kit compatible with the Ultimate3S transmitter kit, and also for standalone use in homebrew projects
R526.00
Arduino_Shield.jpg
Arduino Shield (Assembled) (ARDS(A))
Assembled and tested. This is a versatile Arduino shield kit, which could be used in a variety of ways, for example: - QRSS/WSPR Transmitter - Signal generator (using Si5351A module or AD9850 DDS module) - Clock generator (3 independent outputs, using Si5351A module kit) - GPS-disciplined reference - And much more... Always download the latest information from the website at https://www.qrp-labs.com/uarduino.html This kit is an Arduino shield kit only (additional items are shown in some of the photographs, to illustrate possible applications). The kit contains PCB, Arduino headers for connection to an Arduino Uno, Reset button, 4-way headers for plugging in an LPF module, two 10-way headers for plugging in a frequency synthesiser module, necessary components for a QRP power amplifier (around 1/4 Watt on 30m band; varies depending on band), and BNC connector for RF output. An Arduino board and additional plug-in modules should be purchased as required for your intended application. It is compatible with the QRP Labs LPF kit, QRP Labs Si5351A module kit, QRP Labs OCXO/Si5351A module kit, and QRP Labs relay-switched LPF kit. It can also be used with the SKM61 GPS receiver module, and popular AD9850 DDS modules. This diagram shows a typical application, a QRP WSPR transmitter. All green-shaded modules are QRP Labs kits. In this example, the "Ultimate Arduino shield" is plugged onto the Arduino Uno. Si5351A Synthesiser module and LPF kits are plugged into the Arduino shield. A GPS receiver module such as the SKM61 is connected to provide precise timing, and location information for WSPR.
A shield for the arduino range to do wspr and other beacon modes, assembled
R381.00
Arduino_Pro_Mini.jpg
ATMega328p 5V 16MHz Arduino Pro Mini (ATMega328p 5V 16MHz Arduino Pro Mini)
ATMEGA328 328p 5V 16MHz Arduino-Compatible Module Board

Description:

New version, Pro Mini 328  5V  16MHz ,  arduino-compatible
High Quality components and soldering material
Bootloader Ready, plug and play.

Package included:

1 x Pro Mini 328  5V  16MHz arduino-compatible


Notice from customer Mattias Schlenker:

If uploading sketches using the Arduino IDE fails, follow these steps to update the bootloader:

  -Prepare an Arduino Uno, Mega or similar to act as ISP as described at http://arduino.cc/en/Tutorial/ArduinoISP
  -Wire it up as shown in flasbootloader_connected.png (Picture Reveiw of SKU099688)
  -Use Arduino IDE to flash the bootloader of the corresponding Pro/Pro Mini (5V, 16MHz) to SKU099688 or SKU066315
ATMega328p 5V 16MHz Arduino Pro Mini
R80.00
ArduinoNano.jpg
ATmega328P Nano V3 Arduino Controller Board (ATmega328P Nano V3 Arduino Controller Board)
Specification:

Microcontroller Atmel ATmega328
Operating Voltage (logic level): 5V
Input Voltage (recommended): 7V ~ 12V
Input Voltage (limits): 6V ~ 20 V
Digital I/O Pins: 14 (of which 6 provide PWM output)
Analog Input Pins: 8
DC Current per I/O Pin: 40mA
Flash Memory: 32KB (ATmega328) (of which 2 KB used by bootloader)
SRAM: 2KB (ATmega328)
EEPROM: 1KB (ATmega328)
Clock Speed: 16MHz
Chip: CH340G (CH340B is the update version of CH340G, CH340B comes with crystal, but CH340G doesn't, and we default sending CH340G version)

Note:

Improved USB chip for speed and stability using WIN7/WIN8. This version comes with the pin headers unsoldered and not included the USB cable.


Package include:

1 x No welding Arduino Compatible Nano V3.0 Board
ATmega328P Nano V3 Arduino Controller Board
R80.00
BPF
Band Pass Filter (Assembled) (BPF(A))
Assembled and Tested.

This Band Pass Filter (BPF) kit is for receiver input filtering. It uses the popular double-tuned-circuit which is reliable and easy to build, without needing access to any special equipment.

Kits are available for 10 HF bands 160, 80, 60, 40, 30, 20, 17, 15, 12, and 10m.

The kit uses a high-quality double-sided PCB with silk-screen, solder-mask and through-hole plating. The capacitors supplied with the kit are high-quality RF ceramics of the C0G type (a.k.a. NP0 - near-zero temperature coefficient).

Designed for the relay-switched LPF kit, or your own projects!

The Band Pass Filter kit is the same size as our LPF kit, 1.5 x 0.5 inches (38.1 x 12.7mm). The kit can therefore be used with our relay-switched filter kit. It has a 50-ohm input and output impedance.

Please read the kit-building instructions (see below) for more details on the circuit, design trade-offs, construction, and adjustment procedures.
Band Pass Filter Kit (Assembled)
R198.00
Clock (Assembled) (CLOCK(A))

This is a shack clock kit which can optionally also be connected to a GPS receiver module such as the QLG1 to provide precise time. Alternatively it can be used standalone or with a different 1 pulse per second (pps) signal source.

This clock kit is based on the same hardware as Ultimate3/3S QRSS/WSPR kit and a special firmware version. A GPS receiver module such as the QLG1 can optionally be connected for precision time-keeping. The display format is customisable; as well as time and date, you can also choose to display GPS data (e.g. location, number of received satellites, etc).

The clock can be configured to display time, date, and various information decoded from the GPS serial data stream. Two Analogue temperature sensors an optionally be connected to the kit, so that temperature measurements can be displayed (for example, indoor and outdoor temperature). The contents of the display are configurable. The photographs on this page show the default configuration of the clock display.

Shack Clock Kit Assembled
R481.00
DS1302_RTC.jpg
DS1302 Real Time Clock Module (DS1302 Real Time Clock Module)
DS1302 Real Time Clock Module for Raspberry Pi and Arduino
DS1302 Real Time Clock Module
R38.00
Dummy Load (Assembled) (20wDummyLoad(A))
Assembled and tested.

A useful shack accessory, this is a simple 50-ohm 20W dummy load kit using 20 individual 1K resistors in parallel. Additionally this kit has a diode-capacitor rectifier for detecting the peak voltage of the RF waveform, which may be measured using a DVM.

The dummy load kit comes with 20 1K 1% 1W resistors, a diode-capacitor rectifier for peak voltage readings using a DVM, and a BNC connector. There are two identical PCBs, and the resistors are sandwiched between them to minimise stray inductance. The PCB size is 1.7 x 1.4 inches (43 x 36mm). The sandwiched-together assembly is about 0.6 inches (15mm) thick. Please note that the BNC connector is threaded but no mounting nut is included.

Measured DVM power output indication

This is a simple and inexpensive peak voltage detector and you should not expect amazing accuracy from it. However it can give a useful indication of output power, and even a reasonably accurate one if you calibrate it using a known accurate power meter. The following measurements were made on one kit (as constructed for the assembly manual photography) and power output 0.8mW to 10W. The power measurement was made using the peak-to-peak measurement function of a 100MHz digital oscilloscope. The DVM used was an inexpensive common yellow plastic few-$ type. The two graphs below show the same data, but the second graph (blue line) is zoomed in to show the very low power region 1-400mW. 

HF 20W Dummy Load Assembled
R271.00
NokiaLCD.jpg
Graphic LCD 84x48 - Nokia 5110 (Graphic LCD 84x48 - Nokia 5110)

The Nokia 5110 is a basic graphic LCD screen for lots of applications. It was originally intended to be used as a cell phone screen. This one is mounted on an easy to solder PCB.

It uses the PCD8544 controller, which is the same used in the Nokia 3310 LCD. The PCD8544 is a low power CMOS LCD controller/driver, designed to drive a graphic display of 48 rows and 84 columns. All necessary functions for the display are provided in a single chip, including on-chip generation of LCD supply and bias voltages, resulting in a minimum of external components and low power consumption. The PCD8544 interfaces to microcontrollers through a serial bus interface.

Note: There may be small blemishes on these screens as they are surplus.

Note: Your screen may or may not have a diode on the PCB. It does not affect performance and will vary depending on our shipment.

Graphic LCD 84x48 - Nokia 5110
R78.00
HF QRM Noise Canceller (QNC) (QNC1)

How Does It Work?

The basic QNC unit is a small box that is inserted in-line with the main antenna coax that comes from the main antenna to the amateur’s radio in the shack, with one small addition: It has an extra AUX Input.

The AUX antenna (“Noise Pickup  Antenna”)is simple a length of wire 6 meters long, placed lower down to catch the local noise, if it is installed too high it will pick up the far away signals which is not what we want to reduce. The focus is on the local noise, thus a lower physical installation. I ran my own wire under the eaves of my house.

The QNC unit takes the AUX signal from the local Noise Pickup Antenna inverts it, and mixes it with the Main Antenna input. The result – which contains the wanted distant signal minus the unwanted local signal – is then sent to the amateur’s radio normal input.

By adjusting the mixing the local noise on the signal can be cancelled out almost completely. The level of cancelling can be adjusted over a wide range. The best situation is where all the local stations are cancelled out and only the far away stations are audible. But then you risk talking over the local Stations trying to contact the far stations. A bit of experimentation will be required to achieve the best operation!

During the last few months I found the unit especially useful to me working the HF bands.

The QNC currently works from 1Mhz to 30Mhz, and there are plans to expand the range from 1.5 MHz to 50 Mhz.

YouTube Link QRN In Action

The basic QNC unit is a small box that is inserted in between the main antenna coax from the main antenna and the radio to reduce noise
R1,599.00
KY-040.jpg
KY-040 Rotary Decoder Encoder Module For Arduino AVR (KY-040 Rotary Decoder Encoder Module For Arduino AVR)
KY-040 Rotary Decoder Encoder Module For Arduino AVR PIC

Description:

The rotary encoder is used to measure the speed and with PWM technology can achieve rapid speed devices
With fixed bolt hole for easy installation
Great for DIY project

Specification:

Model: KY-040
Working voltage: 5V
Material: PCB + Brass
Weight: 10g
Size: 32 x 19 x 30mm

Package included:

1 x KY-040 rotary decoder module
KY-040 Rotary Decoder Encoder Module For Arduino AVR
R42.00
LPF
LPF Low Pass Filter (Assembled and Tested) (LPF(A))
Assembled and Tested.

This Low Pass Filter (LPF) kit is based on the
G-QRP technical pages design by Ed Whetherhold W3NQN. Kits are available for 13 bands 2200, 600, 160, 80, 60, 40, 30, 20, 17, 15, 12, 10 and 6m. The kit uses a high-quality double-sided PCB with silk-screen, solder-mask and through-hole plating. The capacitors supplied with the kit are high-quality RF ceramics of the C0G type (a.k.a. NP0 - near-zero temperature coefficient). Designed for the U3 & U3S kits, U2 kit, relay-switched LPF kit, Arduino shield, or your own projects!

The Low Pass Filter kit can handle at least 10W safely.

Printed instructions are NOT supplied with the kit. You can download the kit-building instructions for your PCB from the links below. PCB revision 1 has nothing written on the PCB. Revision 2 has "Rev 2" written on the PCB silk-screen in two places.
Pluggable (interchangeable) low pass filters for use with QRP transmitters or laboratory instruments, Assembled
R192.00
Oven Controlled Crystal Oscillator (Assembled) (OCXO(A))
This kit is an Oven Controlled Crystal Oscillator (OCXO) version of the standard Si5351A Synthesiser module kit. The 27MHz OCXO is kit-built, it does not use an expensive commercial OCXO component. Construction of this kit is more difficult than the other kits, however it does not require any special techniques or equipment, as long as the construction steps are followed carefully.

The Si5351A is a relatively recent clock-generator chip manufactured by SiLabs. It can produce three simultaneous independent 50-ohm impedance, squarewave outputs between 8kHz and 200MHz. Configuration of the chip is via a microcontroller with I2C (two-wire) interface.

NOTE: QRP Labs tested the actual frequency range of the Si5351A outputs. The minimum frequency configuration with 27MHz crystal produces 3.515kHz output. The maximum frequency appears to be an internal limitation (not limited by the configuration) and was approximately 292MHz. Of course, outside the specified range of the datasheet, there are no guarantees...

The 27MHz OCXO is a kit-built oven made of PCB pieces. The Supplied PCB measuring 10 x 8cm breaks into 16 pieces: one main PCB and 15 small pieces which make up three boxes, that are used for the oven chamber and external box. The Proportional Integral temperature controller is simple but effective.

This OCXO/Si5351A synthesiser module kit requires a 5V supply. The tiny 0.5mm pin-spaced Si5351A chip is pre-soldered to the PCB at the factory. The remaining components are all through-hole components. The component density is quite high and construction requires following the instruction manual steps carefully. The circuit contains two 3.3V regulator and I2C level converters, for use with the I2C bus in 5V microcontroller systems. The kit has a 2 x 10-pin 0.1-inch header for all connections.

The synthesizer may be used in a variety of projects. The pinout has been designed to be somewhat similar to the popular AD9850 DDS module and may be substituted in certain cases (with appropriate software changes in the controller). This Si5351A module is also designed to be compatible with the Ultimate3/Ultimate3S QRSS/WSPR kits. It can be plugged into the U3 kit with certain minimal hardware modifications to the U3. It is directly compatible with the Ultimate 3S kit without modification. It requires Ultimate3 firmware v3.07 or above, to communicate with the Si5351A via I2C. Note that for use in the original U3 kit, not U3S, (PCB revisions 1 to 4), pin 12 of the header needs to be removed before installation.

The Oven Controlled Crystal Oscillator (OCXO) is a very high precision Si5351A frequency synthesiser, assembled
R471.00
PL2303HX.jpg
PL2303HX USB To RS232 TTL Adapter Module (PL2303HX USB To RS232 TTL Adapter Module)
Description:

Input voltage: 4.5-35V
Output voltage: 1.5-35V(Adjustable)
Output current: Rated current is 2A, maximum 3A (Additional heatsink is required)


Features:

Conversion Efficiency: Up to 92% (higher output voltage, higher efficiency)
Switching Frequency: 150KHz
Rectifier: Non-Synchronous Rectification
Module Properties: Non-isolated step-down module (buck converter)
Short Circuit Protection: Current limiting, with recovery
Operating Temperature: Industrial grade (-40  to +85 ) (output power 10W or less)

Full load Temperature rise: 40
Load Regulation: ± 0.5%
Voltage Regulation: ± 2.5%
Dynamic Response speed: 5% 200uS
Dimension: 43*20*14mm (L*W*H)


Package Includes:

1 x LM2596 DC-DC Step-down Module
PL2303HX USB To RS232 TTL Adapter Module
R48.00
Polyphase Network (Assembled) (Poly(A))
Assembled and Tested

This is a kit and you will be receiving a plastic bag with components. The photos are representative examples of the completed kit.

This polyphase network plug-in module is designed to fit the
high performance receiver module, to cancel the unwanted sideband and produce a SSB output, without need for Digital Signal Processing. It is also suitable for people with mono-input sound cards.

The polyphase network is a combination of resistors and capacitors which can convert the 4-phase audio from a Quadrature Sampling Detector into single sideband output. Low noise LM4562 op-amps are used in instrumentation amplifier configuration to provide excellent common mode noise rejection in the final difference amplifier. The PCB size is 37 x 27mm and is designed to plug into the receiver module kit. The intended application of this module is in CW, QRSS and WSPR receiving equipment where the important frequency range of interest is 700 to 1800Hz. If you have a stereo input soundcard then you can process the I-Q directly from the receiver audio output, without needing this polyphase kit.
Polyphase Network for SDR Receiver Assembled
R321.00
ProgRock (Assembled) (ProgRock(A))
Assembled and Tested.

This is a kit and you will be receiving a plastic bag with components. The photos are representative examples of the completed kit.

This kit is a simple minimalist controller for the
Si5351A Synth kit (included with the ProgRock kit). It is intended as a programmable crystal replacement. It has three independent outputs with frequency range 3.5kHz to approx 300MHz, and can be optionally GPS disciplined.

The features of this kit are as follows:

  • Includes Si5351A Synth kit AND "ProgRock" PCB kit
  • Easy construction, no surface-mount components to solder (Si5351A already pre-soldered)
  • 3 independent 3.3V p-p squarewave outputs (2 if you use GPS discipline)
  • You can feed the outputs through LPF kits to get sinewave outputs
  • 8 selectable “banks” of frequencies, chosen by 3 input control signals
  • Frequency range 3.5kHz to 200MHz
  • Extended frequency range up to approx. 300MHz if you don’t mind violating the Si5351A datasheet specifications
  • GPS frequency discipline using 1pps from a GPS receiver
  • Unique power supply noise filter circuit designed by Alan Gray G8LCO
  • Power supply voltage 5V, or using LM317LZ regulator (supplied), range is 5-12V DC
  • Minimalist configuration user interface using 4-way DIP switch, push button, and LED
  • Frequencies and configuration stored in non-volatilte memory (EEPROM) for next power-up
ProgRock is a crystal replacement for those hard-to-get values. Assembled and Tested.
R461.00
Relay Switch Board (Assembled) (Relay(A))
Assembled and Tested

This relay-switched LPF board kit can have up to five additional LPF's plugged in, permitting the Ultimate3 and Ultimate3S QRSS/WSPR kits to sequence between 6 bands (including the LPF on the main U3 board). The board size is 80 x 37mm, the same as the U3, so the boards stack together using four 25mm hex spacers. The plug-in LPF modules are available separately, click here.

The kit can also be used with your own homebrew radio projects!

Some people wish to interface this relay kit with 3.3V systems such as the Raspberry Pi, or systems which cannot support the 28mA relay current from processor I/O pins directly. This relay driver is suitable for such cases
Relay Switch Board Assembled and Tested
R421.00
S15351A Synthesizer (Assembled) (Synth(A))
Assembled and Tested.

The Si5351A is a relatively recent clock-generator chip manufactured by SiLabs. It can produce three simultaneous independent 50-ohm impedance, squarewave outputs between 8kHz and 200MHz [See note]. Configuration of the chip is via a microcontroller with I2C (two-wire) interface. This kit (a.k.a. "breakout board") contains pre-soldered Si5351A chip, 3.3V regulator, and I2C level converters.

This Si5351A synthesiser module kit (or "breakout board") runs from a 5V or 3.3V supply. The tiny 0.5mm pin-spaced Si5351A chip is pre-soldered to the PCB at the factory. The PCB size is 1.3 x 1 inches (33 x 25mm). The remaining components are all through-hole components so construction is easy. The circuit contains a 3.3V regulator and I2C level converters, for use with 5V microcontroller systems. The kit may also be built without the level converters or regulator, for use in 3.3V systems. The kit has a 2 x 10-pin 0.1-inch header for all connections. Additionally pads are provided on the PCB for soldering SMA connectors if you wish. The kit uses a 27MHz crystal as the reference oscillator.

The synthesizer may be used in a variety of projects. The pinout has been designed to be somewhat similar to the popular AD9850 DDS module and may be substituted in certain cases (with appropriate software changes in the controller). This Si5351A module is also designed to be compatible with the Ultimate3/3S QRSS/WSPR kits. It can be plugged into the U3 kit with certain minimal hardware modifications to the U3. It is directly compatible with the Ultimate3S kit without modifications. It requires Ultimate3 firmware v3.07 or above, to communicate with the Si5351A via I2C. Note that for use in the original U3, not U3S, (PCB revisions 1 to 4), pin 12 of the header needs to be removed before installation.

Starting from PCB Rev 4, the PCB has pads that will support use of a 7 x 5-mm or 5 x 3.2-mm SMD 27MHz TCXO (not supplied) instead of the supplied 27MHz crystal. Please refer to Rev 4 assembly manual, see below. 

NOTE: QRP Labs tested the actual frequency range of the Si5351A outputs. The minimum frequency configuration with 27MHz crystal produces 3.515kHz output. The maximum frequency appears to be an internal limitation (not limited by the configuration) and was approximately 292MHz. Of course, outside the specified range of the datasheet (8kHz - 200MHz), there are no guarantees...

S15351A Frequency Synthesizer Oscillator Assembled and Tested
R255.00
SDR Receiver (Assembled) (RECV(A))
Assembled and tested. The photos are representative examples of the completed kit.

This is a high performance SDR receiver module, with I-Q audio output. It has 600:600-ohm audio isolation transformers at the output are used to reduce ground loops that often occur in SDR systems. The kit includes one
BPF kit (choice of any band 160m to 10m).

This high performance receiver module uses a Quadrature Sampling Detector (QSD), also known as a Tayloe Detector. The mixer is arranged as a double-balanced mixer for maximum performance. The receiver board has a socket for the standard QRP Labs Band Pass Filter kit. There is a transmit/receive switch onboard. Low noise LM4562 op-amps are used in instrumentation amplifier configuration to provide excellent common mode noise rejection. The receiver requires a local oscillator (LO) input at 4x the receive frequency. This could be generated by the QRP Labs Ultimate3S QRSS/WSPR kit, the VFO/Signal Generator kit, or ProgRock kit.

The audio output of the module is isolated using two 600:600-ohm transformers to reduce or eliminate the ground loop problems which can easily occur in SDR systems. The module is designed to directly drive a stereo input sound-card. For those situations where a PC has only a mono input (many PCs are like this, particularly laptops), there is an optional polyphase network plug-in module kit which cancels the unwanted sideband and produces a single sideband (SSB) output. 

The module is sized 80 x 37mm, exactly the same as the Ultimate3S QRSS/WSPR transmitter kit and VFO/Signal Generator kits, so that it can be bolted behind these modules if required. 

The receiver kit INCLUDES one Band Pass Filter kit for a band of your choice, from 160m to 10m.

High performance SDR receiver module with I-Q audio output assembled and tested
R641.00
Step-down 2A LM2596 (LM2596/2A)
Description:

Input voltage: 4.5-35V
Output voltage: 1.5-35V(Adjustable)
Output current: Rated current is 2A, maximum 3A (Additional heatsink is required)


Features:

Conversion Efficiency: Up to 92% (higher output voltage, higher efficiency)
Switching Frequency: 150KHz
Rectifier: Non-Synchronous Rectification
Module Properties: Non-isolated step-down module (buck converter)
Short Circuit Protection: Current limiting, with recovery
Operating Temperature: Industrial grade (-40  to +85 ) (output power 10W or less)

Full load Temperature rise: 40
Load Regulation: ± 0.5%
Voltage Regulation: ± 2.5%
Dynamic Response speed: 5% 200uS
Dimension: 43*20*14mm (L*W*H)


Package Includes:

1 x LM2596 DC-DC Step-down Module
LM2596 DC-DC Adjustable Step Down Power Supply Module
R48.00
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