Improvised dummy load.
I had to adjust the PA of my mcHF and did not have a phantom charge at hand. I looked in "the trunk of the junk memories" and found an old instrument of 50 μA DC full scale that was never used. I only had to buy 29 carbon resistors of 1,500 Ω, 2 Watts, which were connected in parallel to obtain a value of 51.72 Ω. Everything was put in an ad hoc box. A PL259 female connector was located on the rear and another female BNC connector on the front. The idea was to obtain in the BNC connector a sample of the attenuated input signal ten or one hundred times, to analyze it in an oscilloscope. Since the original idea was to use it up to 30 Mhz, no precautions were taken to arrange the resistances around a radial conductor, it was enough to connect them in parallel as close together as possible and keep short terminals. With copper ribbon, all terminals were joined on each side. The signal present in the load resistor is rectified with a diode bridge 1N4148, then fi...