I sent a JT-65 CQ transmission into a dummy load and recorded the audio using DM780's audio recorder (my FT897/SignaLink setup doesn't allow easy Audacity recordings). Then I used Audacity to analyze (i.e. playback) the recorded audio in spectrum mode. A portion of the audio appears below.
If I understand JT-65's (inter-tone) 1,271 Hz synchronizing tone, it appears very close to 1,300 Hz in the image. Now I have two questions:
1. Is the image's 1,300 Hz inter-tone frequency indeed JT-65's sync frequency?
2. What is that constant 1,000 Hz tone
Thanks in advance for your replies.