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3

To reduce direct coupling between chassis (generator and DUT), I use a long antenna coax (10 to 20 meters or more), and put the RF source plus attenuators on the far side of the building, with the attenuator chain some distance from the RF source on another coax. You may or may not need to take into account the loss on the coax (which might be less than the ...


4

Quite likely the signal generator, and the radio, are too leaky to do this experiment on one bench top. So the signal received by the radio is not as small as you think it is. The solution would be to eliminate the leak path, by shielding one or both ends. You'll get good results with aluminium foil: Power the HT from its battery only. Connect some of the ...


1

Not only the antenna. It would also include the antenna, the tuned LC circuits, and how tightly the antenna was coupled to the latter. Spark transmitters produced a damped wave. This edited graph from Wikipedia shows one with desirable longer duration. The longer the system "rang", the higher the average power --which is what the decremeter measured-- and ...


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