In the latest test I am transmitting a signal using BPSK  carrier inversion driven by the one pulse-per-second output of a GPS receiver.  This highly accurate time-stamped signal is used in the analysis of ionospheric propagation.   Receivers having precise time resolution are used to measure time-of-flight of this and other time-stamped signals.

Here are the details:

• Power: 1W
• Frequency: 7.0399 MHz
• Modulation: BPSK, 1 Hz phase inversion
• ID modulation: 18 wpm morse, on/off keying
• Transmitter location: Friday Harbor, WA (48° 30′ N, 123° 1′ W)
• Transmit sequence:
  • Minute 0 – 3 : PPS BPSK
  • Minute 4: morse ID, followed by carrier off
  • repeats every five minutes