This ~1W to ~5W WSPR beacon runs continuously on the 10m band. It handles extreme environmental temperatures pretty well (it is 42°C plus here). Our article on this beacon's design and operation will appear in the May/June 2025 issue of the QEX magazine soon. References WSPR TX by G0UPL QEX May-June 2025 TOC ...
Ismo (OH2FTG) recently introduced me to a bunch of Tokmas RF parts. Out of these, the Tokmas CID10N65F GaN FET stood out. It seems to have a lot of potential (for HF + 6m) at a very low price point. This RF MOSFET part can be purchased from LCSC. It seems Tokmas CID10N65F has the potential to completely replace the RD16HHF1 part from Mitsubishi Electric! Datasheet Datasheet excerpt: ...
I have designed, built and tested an all-HF WSPR beacon which produces 1W @ 5V and is rugged and cost-effective. Results Power consumption: Around 420mA @ 5V. Cost Cost: Around 500 INR. Time to build Time to build: Less than 30 minutes. Files The files for this project are published here for personal (non-commercial) usage. For a 5W (QRO) WSPR beacon, please hold on for our upcoming QEX magazine article ;) ...
I have built probably the easiest, reasonably rugged and most cost-effective 100mW WSPR (or FT8) beacon. The Build Here is my quick and dirty build with whatever I had lying around: We have replaced the traditional expensive Mini-Circuits transformer with a cost-effective Bourns coupled inductor. Analysis Power consumption: Before RF generation starts ➔ 20mA @ 5v. After RF generation starts ➔ 52mA @ 5v. So the power input consumed in the RF generation process is more than 150mW it seems (which is good). ...
The Easy WSPR Encoder can be accessed here. Update: You may find this software more useful.
I am building an easy-to-use and cost-effective WSPR pHAT for Raspberry Pi Zero 2 W. Design 3D render: We have replaced the traditional expensive Mini-Circuits transformer with a cost-effective Bourns coupled inductor. Status Results: To be built and tested soon! Time to build: Less than 20 minutes