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The Ultimate3S QRSS/WSPR Transmitter Kit is the new edition of the third version in the "Ultimate" QRSS/WSPR kit trilogy. It can produce QRSS, Hell, WSPR, Opera and PI4 slow-signal modes anywhere from 2200m to 2m and even 222MHz bands. Plug-in LPF filters are available for all 16 HF/MF/LF/VHF bands from 2200m to 222MHz.

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$33

The Si5351A VFO/Signal Generator kit has a rotary-encoder tuned output, and a separate independent fixed (configurable) output. Both outputs have a range of approximately 3.5kHz to 290MHz. A GPS receiver can be connected to maintain precise frequency output.

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$33

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).

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$19

10W HF Linear Power Amplifier. Comfortably produces 10W from 12V supply (CW, PEP and Digital modes). Compact design with huge heatsink included, which will not overheat even on continuous 100% duty-cycle operation. 26dB gain with +/- 1dB gain flatness from 1.8 to 30MHz.

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$26

A 5W HF PA kit 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.

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$20

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).

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$25

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.

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$11

LightAPRS is the most affordable, smallest, lightest, powerful and one of few open source APRS trackers available. It makes tracking pico balloons, weather balloons, model rockets, RC aircraft, and anything else that flies simple and easy. It is able to report location, altitude, temperature and pressure to the internet (APRS-IS) or direct to an amateur radio once a minute with a solar panel/super capacitors or just 4xAAA batteries. Because LightAPRS is open source you can add your own custom sensors via I2C/SPI pins. 

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$115

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!

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$4.90

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.

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$8.50

This GNSS/GPS receiver module kit is mostly SMD (pre-assembled), and includes a high sensitivity active antenna with 2m coax and SMA connectors. 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.

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$20

This GPS receiver module kit is mostly SMD (pre-assembled), and includes a high sensitivity active antenna with 2m coax and SMA connectors, and a USB to Serial converter. 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.

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$23

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 more...

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$14

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.

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$7.75

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.

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$16

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.

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$16

This Low Pass Filter (LPF) kit is based on the G-QRP technical pages design by Ed Whetherhold W3NQN. Kits are available for 16 bands 2200, 600, 160, 80, 60, 40, 30, 20, 17, 15, 12, 10, 6, 4, 2m and 222MHz. 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 low-loss RF ceramics of the NP0 type (near-zero temperature coefficient). Designed for the U3 & U3S kits, U2 kit, relay-switched LPF kit, Arduino shield, or your own projects!

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$4.60

The U3/U3S case is made from black anodised aluminium, dimensions 122 x 45 x 160mm deep. It's a 4-part case: front panel, back panel, top half and bottom half. The 4 parts are held together by 8 screws. The front and rear panels are drilled and silk-screen printed for the Ultimate3 and Ultimate3s kits, as shown. The case also includes an accessory kit, with switches, buttons, connectors etc.

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$22
+ shipping