HamPi Radio
High performance 16 Band DIY Amateur Radio Transceiver for Home Constructors
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The HamPi Radio Project HAM Transceiver
Welcome to the HamPi Radio project—a high-performance, 16-band self-build amateur radio transceiver designed specifically for the dedicated home constructor and radio electronics enthusiast. Engineered to deliver exceptional receiver and transmitter quality without the frustration of complex digital menus, the HamPi provides tactile, real-knob controls right on the front panel. Make fast adjustments instantly without wading through complicated sub-menus.
Whether you are passionate about homebrew ham radio building or looking for a robust LF / HF / VHF transceiver project, the HamPi delivers:
Continuous Coverage Receiver: Tunes from 160kHz to 144MHz (CW & SSB).
Multi-Band Transmitter: Delivers 100W on HF bands (160m–10m), with lower power output on 8m, 6m, and 4m (Yes, 8 meters is included!).
Digital Modes: Native support for FT8 and WSPR data modes is fully operational.
Advanced QRM Filtering: High-performance SSB and CW crystal filters are housed on a dedicated sub-board alongside a custom-designed noise blanker. This blanker effectively eliminates intrusive spikes, woodpecker interference, electric fences, and static crashes from -90dBm to over 0dBm.
Advanced Features for the CW Operator
For the CW operator, this HAM transceiver offers rapid, intuitive control over essential functions:
Tactile Front Panel Adjustments: One-press buttons for RIT functions, a dedicated crystal CW filter, a 4-stage audio filter, a sharp notch filter, and IF gain controls.
Advanced Keying Capabilities: Built-in IAMBIC A & B keying, FIFO keying, and full break-in support.
Linear Amplifier Delay: Adjustable linear delay from 0–1000mS (in 100mS steps) for full and semi break-in. This control utilizes an internal relay, making Linear Amplifier connection incredibly straightforward.
Adjustable Side-Tone: CW pitch/side-tone is fully adjustable from 400Hz to 1000Hz (in 100Hz steps).
CW Decode software is currently in active development.
What is Included in the DIY Ham Radio Kit?
This is a complete DIY ham radio kit based around 4 main PCBs. To make construction accessible while keeping performance high, the boards are supplied with the SMD parts pre-fitted. The remaining leaded components, final assembly, and alignment are completed by the constructor.
A current HamPiRadio being tested on WSPR (12 May 2026)
An alternative front panel. The front panel is evolving. It will be interesting to see whether the black or this one is most popular.
Latest news: 19Sept 2026
The HamPiRadio is performing well. A local friend / radio ham / radio engineer Keith has been helping for over a year now. When I have time I get on air and pop a few contacts. See QRZ.com ZL3AX. Data modes are working and WSPR database shows just how many countries have heard the HamPi in the few hours it has been putting out a WSPR signal. FT8 has been working for many months now.
Today (17 Aug '26) three Noise Blanker sub boards (it fits on the Radio Board) have been built and perform beyond expectations. Interfering pulses are removed from below -90dBm to above 0dBm. Over much of this range there is nothing to be heard of the interfering signal at all.
The Radio Board, CPU, Keypad, Front panel assembly and Band Pass Filter boards are performing very well.
The Radio Board has gone through a number of improvements and about to be put to PCB very soon. Iss 10 works extremely well. One change is a decision to have the SSB and CW Crystal filters on a small plug-in sub board (42 x 38mm). It will be supplied built and tested. The reason is that to get these filters working well needs care and a spectrum analyser is needed. Getting the crystal filters to work while part of the main board proved difficult, and is so it is much better to build and test off-board. The other big change is there is a small plug-in sub board for the Noise Blanker. This is a much improved and redesigned approach to catch those nasty crashes, woodpeckers and here in NZ my electric fence for the cattle.
The PA Board is working very well on all HF bands using the RD100HHF1 devices, which can easily produce 150W or more on the lower bands. Taking into consideration the LPFs , the amount of power has to be throttled back to closer to 100W. This board (the final board in this project) is now in full focus again. We are focussing on getting the upper frequencies and low pass filtering improved for working on 8, 6 and 4mtr bands (Yes that's right, 8mtrs is now part of the project). Although we were going to stop with HF bands for a full release, it was decided to spend some time hacking a couple of older version boards sing the RD70HVF1 devices that will easily give power on the 2mtr band. The Iss 5 PA board is now on order. It will work from 160 - 6m. It also has provision for experimentation on 4 and 2m, but due to time to launch as a working rig, these two bands have been 'paused'.
Apart from the above it just leaves the case metalwork, and that isn't a big task. A few days with that and more can be ordered. This has to happen after the PA mods are done due to the rear 3mm panel of the HamPi is the heat-sink.
If you are keen, knowledgeable, and available we are also keen to hear from you. Areas that could do with assistance in speeding the project up are:
To build up a HamPiRadio using the latest PCBs. The idea is to check this website instructions can be followed and a couple of rigs successfully constructed. You'll need very good soldering / construction / testing skills and test equipment.
The case, so sheet metalwork design experience. The case is out of date and needs checking over and reproducing.
This website!
Interested? See the contact page.
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