QRP-Labs

Sort By:  
An assembled 5W HF Amplifier kit compatible with the Ultimate3S transmitter kit, and also for standalone use in homebrew projects
R526.00
A 5W HF Amplifier kit compatible with the Ultimate3S transmitter kit, and also for standalone use in homebrew projects
R401.00
Arduino_Shield.jpg
A shield for the arduino range to do wspr and other beacon modes, assembled
R381.00
Arduino_Shield.jpg
A shield for the arduino range to do wspr and other HF beacon modes
R281.00
BPF
Band Pass Filter Kit (Assembled)
R198.00
BPF
Band Pass Filter Kit
R98.00
Shack Clock Kit Assembled
R481.00
Clock Kit for The Shack
R381.00
The QRP-Labs Ultimate3S kit in a bundle with the popular bands. Deluxe 6-band U3S set
R2,400.00
HF 20W Dummy Load Assembled
R271.00
HF 20W Dummy Load
R171.00
QLG1 GPS Receiver kit from QRP-Labs
R462.00
QLG1 GPS Receiver kit from QRP-Labs (Assembled)
R562.00
LPF
Pluggable (interchangeable) low pass filters for use with QRP transmitters or laboratory instruments, Assembled
R192.00
LPF
Pluggable (interchangeable) low pass filters for use with QRP transmitters or laboratory instruments
R92.00
The Oven Controlled Crystal Oscillator (OCXO) is a very high precision Si5351A frequency synthesiser, assembled
R471.00
Polyphase Network for SDR Receiver Assembled
R321.00
Polyphase Network for SDR Receiver
R221.00
ProgRock is a crystal replacement for those hard-to-get values. Assembled and Tested.
R461.00
ProgRock is a crystal replacement for those hard-to-get values
R361.00
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
5W HF Amplifier Kit (5WPA)
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. 

This is a kit and you will only be receiving a plastic bag with components that you have to assemble yourself using appropriate tools and skills. Assemblers may be available at additional cost for some kits. The photos are only representative examples of the completed kit. Always download the latest information from the website at http://www.qrp-labs.com

A 5W HF Amplifier kit compatible with the Ultimate3S transmitter kit, and also for standalone use in homebrew projects
R401.00
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_Shield.jpg
Arduino Shield Kit (ARDS)
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...
This kit is an Arduino shield kit only (additional items are shown in some of the photographs, to illustrate possible applications but are not part of the supplied kit). 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 connecting 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.

This is a kit and you will only be receiving a plastic bag with components that you have to assemble yourself using appropriate tools and skills. Assemblers may be available at additional cost for some kits. The photos are only representative examples of the completed kit. Always download the latest information from the website at http://www.qrp-labs.com
A shield for the arduino range to do wspr and other HF beacon modes
R281.00
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
BPF
Band Pass Filter Kit (BPF)
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.

This is a kit and you will only be receiving a plastic bag with components that you have to assemble yourself using appropriate tools and skills. Assemblers may be available at additional cost for some kits. The photos are only representative examples of the completed kit. Always download the latest information from the website at http://www.qrp-labs.com
Band Pass Filter Kit
R98.00
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
Clock Kit (CLOCK)

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.

This is a kit and you will only be receiving a plastic bag with components that you have to assemble yourself using appropriate tools and skills. Assemblers may be available at additional cost for some kits. The photos are only representative examples of the completed kit. Always download the latest information from the website at http://www.qrp-labs.com

Clock Kit for The Shack
R381.00
Deluxe 6-band U3S set, Kit (Deluxe 6-band U3S set, Kit)

Deluxe 6-band U3S set, Kit

This is a deluxe set of kits containing all the kits you need to build a smartly boxed, GPS-disciplined, 6-band QRSS/WSPR modes transmitter using the Ultimate3S.

Deluxe set contents:

The Ultimate3S QRSS/WSPR Transmitter Kit transmits various QRSS, Hell, Opera, PI4 and WSPR slow-signal modes on any LF, MF, HF or VHF band (all amateur bands from 2200m to 2m). This set comprises:

  • Base U3S kit with LCD module, microcontroller with latest firmware, and all board-mounted components
  • Si5351A synthesiser module kit (Si5351A chip is pre-soldered at the factory)
  • Relay-switched 6-band Low Pass Filter extension kit
  • Low pass filter kits for 10, 15, 20, 30, 40 and 80m
  • QLG1 high-sensitivity GPS receiver kit
  • 2 extra BS170 transistors, as spares or in case you want to try higher power output
  • Ultimate3 enclosure kit, drilled, printed, and with controls, connectors and accessories. Shipped separately from China by airmail

The kits are easy to build, with through-hole components only (no surface mount soldering). Additional plug-in low pass filter modules are available for any of 13 amateur bands from 2200m to 6m. The kit can transmit on any frequency up to 150MHz, with the appropriate low pass filters.

NOTE... LPF bands: if you want to have different LPF bands than the 6 listed above, that is fine! Please specify the required changes on the customer notes entry in the order form. 

NOTE... Receiver: if you add the receiver kit as an optional extra when you order, please note that the receiver kit includes a band pass filter kit. This is for your choice of any one band from 160m to 10m. Please specify which band you want for the band pass filter in the customer note fields when you checkout. 

NOTE... GPS: All the above kits will fit together inside the supplied enclosure. However the GPS patch antenna cannot work through a metal box! So you must either arrange for the GPS receiver to be outside in its own box, or you need to use an external antenna and run some coax into the box.

Please read the manuals and understand your kits before purchase. 

Printed instructions are not supplied with the kit! You need to download the following PDF instruction documents (click links to go to the web page where you can download the document):

The QRP-Labs Ultimate3S kit in a bundle with the popular bands. Deluxe 6-band U3S set
R2,400.00
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
Dummy Load Kit (20wDummyLoad)
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
R171.00
GPS Kit (QLG1)
This GPS receiver module kit includes an extremely sensitive patch antenna, with factory pre-soldered Mediatek chipset RF module. It has three onboard LEDs for visual status indication, 3.3V regulator and power supply filtering, and 5V logic level conversion. It's easy to build and directly compatible with all QRP Labs kits.

The RF module uses the MediaTek chipset and it is essentially comparable to the QRP Labs supplied SKM61 GPS module. The board size is relatively large (91 x 64mm), this is to provide additional patch antenna gain. Most GPS receiver modules with built-in patch antenna are a compromise between small physical size and sensitivity. If we drop the size constraint, it appears that the antenna sensitivity is optimum with a large patch antenna (25 x 25 x 4mm size is the largest available) and a large 6 x 6 cm PCB ground plane. According to the antenna datasheet the gain is 7.5dBic over that of a 30 x 30mm ground plane. Most small GPS modules are of course smaller than 30 x 30mm. 

The board also includes supply filtering, 3.3V voltage regulator, and level converters to provide 5V input/outputs. The connectors are 0.1-inch pitch so they are easy to solder to. The 4-way connector pads section can be connected DIRECTLY to the Ultimate 3/3S QRSS/WSPR TX kit, with no pullups or decoupling capacitors. There are three 3mm LEDs on board, that give a visual indication of what is happening. They are:

Red: Power (always on)
Yellow: Serial data (flashes when the serial data burst is active)
Green: 1pps (flashes on for 0.1s once per second, when the 1pps signal is present)

Advantages of this module, compared to the SKM61 (and other comparable small GPS receiver modules), are:

1) higher sensitivity of built-in patch antenna, due to large ground plane
2) Provices facility for SMA connector and components for external active antenna if you prefer
3) Has onboard power / data / 1pps LEDs for an immediate visual indication of what is going on
4) Proper level conversion for use with 5V systems, not just pull-up resistors like on the SKM61
5) Larger connection pads with 0.1-inch pitch, suitable for easy wire soldering or pin headers
6) Voltage regulation and all components already on-board, no need for anything other than wire, for U3 connection
7) Low cost
8) A kit - fun and educational to build!

The kit contains the PCB with pre-soldered Mediatek chipset RF module, and all other through-hole leaded components for easy assembly. It also includes four nylon 12mm M3 hex spacers and four M3 screws, for mounting the PCB in an enclosure. The kit is supplied with a 25 x 25 x 4mm custom-manufactured tuned patch antenna. This is installed on the opposite side of the board to the other components. An SMA connector (not supplied) may be fitted if you prefer to use an external active antenna. A 3V rechargeable battery is included, which backs up ephermeris data and can ensure faster satellite lock after short-term loss of power. 

QLG1 GPS Receiver kit from QRP-Labs
R462.00
GPS Kit (Assembled) (QLG1(A))
This GPS receiver module kit includes an extremely sensitive patch antenna, with factory pre-soldered Mediatek chipset RF module. It has three onboard LEDs for visual status indication, 3.3V regulator and power supply filtering, and 5V logic level conversion. It's easy to build and directly compatible with all QRP Labs kits.

The RF module uses the MediaTek chipset and it is essentially comparable to the QRP Labs supplied SKM61 GPS module. The board size is relatively large (91 x 64mm), this is to provide additional patch antenna gain. Most GPS receiver modules with built-in patch antenna are a compromise between small physical size and sensitivity. If we drop the size constraint, it appears that the antenna sensitivity is optimum with a large patch antenna (25 x 25 x 4mm size is the largest available) and a large 6 x 6 cm PCB ground plane. According to the antenna datasheet the gain is 7.5dBic over that of a 30 x 30mm ground plane. Most small GPS modules are of course smaller than 30 x 30mm. 

The board also includes supply filtering, 3.3V voltage regulator, and level converters to provide 5V input/outputs. The connectors are 0.1-inch pitch so they are easy to solder to. The 4-way connector pads section can be connected DIRECTLY to the Ultimate 3/3S QRSS/WSPR TX kit, with no pullups or decoupling capacitors. There are three 3mm LEDs on board, that give a visual indication of what is happening. They are:

Red: Power (always on)
Yellow: Serial data (flashes when the serial data burst is active)
Green: 1pps (flashes on for 0.1s once per second, when the 1pps signal is present)

Advantages of this module, compared to the SKM61 (and other comparable small GPS receiver modules), are:

1) higher sensitivity of built-in patch antenna, due to large ground plane
2) Provices facility for SMA connector and components for external active antenna if you prefer
3) Has onboard power / data / 1pps LEDs for an immediate visual indication of what is going on
4) Proper level conversion for use with 5V systems, not just pull-up resistors like on the SKM61
5) Larger connection pads with 0.1-inch pitch, suitable for easy wire soldering or pin headers
6) Voltage regulation and all components already on-board, no need for anything other than wire, for U3 connection
7) Low cost
8) A kit - fun and educational to build!

The kit contains the PCB with pre-soldered Mediatek chipset RF module, and all other through-hole leaded components for easy assembly. It also includes four nylon 12mm M3 hex spacers and four M3 screws, for mounting the PCB in an enclosure. The kit is supplied with a 25 x 25 x 4mm custom-manufactured tuned patch antenna. This is installed on the opposite side of the board to the other components. An SMA connector (not supplied) may be fitted if you prefer to use an external active antenna. A 3V rechargeable battery is included, which backs up ephermeris data and can ensure faster satellite lock after short-term loss of power. 

QLG1 GPS Receiver kit from QRP-Labs (Assembled)
R562.00
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
LPF
LPF Low Pass Filter Kit (LPF)
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
R92.00
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
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
Polyphase Network Kit (Poly)
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
R221.00
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
ProgRock Kit (ProgRock)
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
R361.00
Per Page      1 - 20 of 32
Queries - 17
Queries execution time - 0.02005
PHP Execution time - 3.2248