Amateur Radio
7 posts in this category
Predicting where a weather balloon’s radiosonde will land from its own radio telemetry alone, testing it on a real flight, and backtesting it against years of launches from Uccle.
Adding computer control to a Ham IV antenna rotator for satellite tracking, using K3NG’s rotator code on an Arduino Pro Micro with an LCD, and calibrating the heading.
Replacing the blown backlight bulb of a 1981 Ham IV rotator controller with a strip of LEDs, a diode, a resistor and a capacitor.
A small PIC 16F648A APRS tracker running the OpenTracker firmware, with a 300 mW HX1 transmitter on the back and a header for a GPS module. Hand-solderable 1206 parts.
A USB CAT interface for the Kenwood TS-50 made from a cheap USB-to-TTL adapter, and how to connect it to the radio.
A home-built serial CAT interface for the Kenwood TS-50 so logging software can follow band and mode changes. Superseded by the USB version.
The story behind the photo on my QSL card: the Hydrocopter that carried me across the ice to Holmön island (EU-135) for a DXpedition in Sweden.