30-Meter Amateur Radio beacon using Parallax Propeller
Eldon Brown, WA0UWH, has been experimenting with a Parallax Propeller he received for Christmas. Being an avid amateur radio operator, Eldon decided to code up a low power radio beacon on the 30-Meter amateur radio band (10.10 to 10.15 MHz.) He wrote this simple program to generate very slow speed CW (Morse code) radio transmissions (a/k/a QRSS) using the Propeller.
At first he generated the desired signal directly from the Propeller with only the addition of a small attached wire antenna. He went on to modify the design to include a low pass filter (above right) to eliminate the PLL synthesizer phase jitter from the Propeller. He connected a proper outdoor antenna through the filter and is transmitting on 10.1387 MHz.
Check out Eldon’s WA0UWH website for the complete project log.This entry was posted in Parallax Propeller, project logs, RF, wireless and tagged amateur radio, radio beacon.