locked Unable to decode FST4W-300 locally on 40m and 30m

Kenji Rikitake JJ1BDX

Testing conditions:

  • Transmitter: Yaesu FT-891 output 5W with SCU-17 and WSJT-X 2.3.0-rc1 on Ubuntu 20.04 with a mobile whip
  • Receiver: Airspy HF+ Dual Port + gqrx 2.11 and WSJT-X 2.3.0-rc1 on macOS 10.14.6 with a YouLoop magnetic loop antenna
  • The distance between TX and RX was about 10 meters

Result of FST4W-300:

  • On 3.5688MHz + 1536Hz: OK
  • On 7.0388MHz + 1536Hz: undecodable
  • On 10.1389MHz + 1536Hz: undecodable

Any thoughts on why the signals of 40m and 30m were not decodable? Frequency drift of FT-891?

73 de Kenji Rikitake, JJ1BDX

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