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1

If you do not use the tuner, you are getting some power (another answer here says around 4%) reflected back into the final stage of the power amplifier (PA) of the radio. This will cause the final transistor(s) to heat up, and the cooling fan will be used to remove the heat. If you do use the tuner, you move the mismatch from the PA to the tuner circuitry, ...


1

For transmit, compared to a perfect SWR of 1:1, an SWR of 1.5:1 will give about 4 % loss of power radiated by the antenna due to reflections at the antenna / feed line junction. All other things equal, this will result in about 0.2 dB drop in signal strength for a remote station receiving your transmissions. Similarly, for your receive , compared to a ...


2

If it is convenient to reduce the swr by fixing the antenna, that would be a more effective solution. But, as you say, 1.5 is not that bad, and likely you would like to continue using the antenna in the phone region anyway. So is it better to run it at 1.5 or engage the tuner? It is probably easier on the radio to use the tuner. The disadvantage of the ...


2

Short version of the answer: VFO B was USB, not USB-D. After manually changing VFO B to USB-D it worked. Longer version: I went back to testing this again and finally noticed that the mode indicator was changing from USB-D to USB every time the WSJT-X keyed up the radio. Apparently telling WSJT-X to use data mode only ensures the radio is using data mode ...


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