On 11/12/2017 13:21, Jerry S wrote:
Is it possible to transmit on two frequencies at the same time with
wsjt-x FT8.
Below are screen prints receiving K4UX sending on two frequencies
yesterday on 30m.
Jerry W8DLD
Hi Jerry,
the things to note here are that the messages are the same, the SNR
numbers are very different, and the frequency separation is a multiple
of 60 Hz (particularly a multiple of 120 Hz).
This all adds up to his signal being modulated by line hum in the audio
domain, from a full-wave rectified, but not fully smoothed, PSU. I would
guess the source of the noise is at the transmitting end but that is not
conclusive as he is the strongest signal. W7OM and KE4FW are only a
little weaker and have no images to I would say with a high probability
that the problem is at K4UX's end. Noise mixing producing unwanted
images only 24 dB down from the fundamental are not desirable although,
by far, not the worst see on the bands.
73
Bill
G4WJS.
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