PE2BZ's blog

Launched on the 14th of april on a Yokohama balloon, a wspr tracker with PA3DJR callsign.

Transmitting 4 bands,

minute zero at 10 meter
minute two at 15 meter
minute four at 30 meter
minute six and minute eight on 20 meter. (default and telemetry extended)

Antenna wire is 1/4 wave for 20 meter, 503 cm from antenna out hanging down and 1/4 wave for 10 meter, 251 cm, up from ground connection to balloon.

Appears to make a great resonator for 15 meter , over 80 percent of the reports comes from the 15 meter band transmission.