Description We have built the simplest, power efficient and 'ready-for-solar' APRS Digipeater and iGate on a MCU (RPi Pico 2 W)! Our existing KISSLink v1 BLE KISS TNC device is capable of running in standalone mode with an alternate firmware! Goal(s): Our design prioritizes low power, reliability, and unattended deployment over flexibility. And yes, we want to do this with cheap, widely available BaoFeng radios. This means a couple of things: ...
Description We have built a Bluetooth-enabled and APRSdroid-compatible digital interface (KISS TNC) for less than 15 USD (for the fully-loaded make including cables). We call it the KISSLink v1. This digital interface can be powered from the USB 5V or the inbuilt battery. Schematic Previous Next / [pdf] View the PDF file here. RX path simulation (AF front-end) ...
The design Here is a "safe" APRS interface for BaoFeng and other radios. Sample schematic: Previous Next / [pdf] View the PDF file here. Render ...
OCXO's are awesome - this is what I learned while trying to get WSPR working reliably on the 2m band. Hardware Here is all you need for reliable WSPR'ing on the 2m band: A RAW OCXO "can" works fine too! Note: This modded Si5351 board image comes from SimonsDialogs. Essentially we are modding the CLK2 output port to become an input port which accepts the OCXO's output signal. ...