New open-source project transforms Android phones into ham radio transceivers
Ham radio operator Vance Vagell has released a video detailing the Android-only companion app for the open-source kv4p HT project. Coupled with the plug-and-play USB-C radio, the kv4p HT app can send text messages, notifications included, using only radio-based APRS messaging. The app can scan unlimited memories and groups and transmit/receive 44kHz 8-bit ADC/DAC audio. Additionally, the app further improves the audio quality by including a variety of filters to help users communicate accurately. Supported devices can even utilize Android’s live captioning capabilities to maximize accessibility.
The hardware behind the radio magic is detailed on the kv4p website and includes the following:
- DRA818V radio module
- ESP-WROOM-32 dev board
- Short and or long antenna
- USB C 180-degree OTG male-to-male
- SMA female 90-degree connector
- Sticky gel pads
- Custom PCB
Fortunately, the website offers a video of the entire build process and set up as a supplement to the written instructions. Users must also print or order the custom case to house the radio components.
As exciting as the prospect of off-grid communication with this system is, it is important to note that it does require a license to use. Users must have at least a technician-class amateur radio license to legally broadcast signals. For those willing to do a bit of studying, a test is the only thing standing between them and amateur radio goodness.
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