Introduction

  • The Ultimate Broadband Receiver Built with an Android Smartphone (hereinafter referred to as “smartphone”)
    Handheld Piggyback Station
    Can be used just like a handheld radio Attaches to the back It can also be operated in a fixed configuration

　Trinity This is a handheld broadband receiver (Handheld Wide Band Receiver) built by combining a 1-yen smartphone (Samsung Galaxy A25 5G) and an SDR dongle (RTL-SDR V4). It was created by integrating this hardware with homemade and open-source software, as well as a bracket for securing the dongle. The control software, 3D printer files for the dongle bracket, and various parts lists are all publicly available.

  • It hasn’t changed in 40 years…
    　In the summer of 2026, I went to Ham Fair for the first time in a long while. Considering that my last visit was at Harumi, I think it’s been about 40 years. Even now, I’m still connecting my PC to my radio and meticulously managing the memory… just like back then. Well, the crowd of attendees—myself included—hasn’t changed either, lol. I really think it’s about time I came up with something new.

  • Digital disruption
    　I don’t think it’s necessary to buy a standalone wideband receiver anymore. Just as music players and digital cameras have been replaced by smartphones, I believe wideband receivers will also become Smartphone centric. All you need to do is plug in an SDR dongle when necessary.
    　There’s been a lot of buzz about the semiconductor industry’s strong performance. The biggest beneficiary of this trend is the SoC, which is featured in the スマホ. It’s achieving both higher performance and lower power consumption simultaneously. Needless to say, the Trinity is a smartphone-based system. The SDR’s software decoder can directly benefit from “Moore’s Law.”Looking at the semiconductors themselves, we can also benefit from the latest Arm technologies used in the SoC. For example, if SVE2 instructions make their way into budget smartphones, higher performance and lower power consumption will be achieved there as well. Buying a commercially available wideband receiver today would likely mean finding joy solely in the device’s physical form…

  • This composition is…
    　I think this sense of déjà vu can be explained by replacing the hardware synthesizer with a software synthesizer, as described at DTM. If you connect a decent audio interface to a PC and run software instruments, you’ve got yourself a “high-performance synthesizer.” It’s the same concept: if you plug an SDR dongle into a smartphone or PC, you’ve got yourself a high-performance wideband receiver”…