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I also did this RF sampler and works great with my B+K 35mhz osc. I also did one more thing to make it convient to hook my frequency counter on and sample at the same time. I drilled another hole in the box and put another bnc connector  with another 100ohm resistor that connects on to the same point as the one for the scope. I then drilled a hole in the side of my Wawassee jb-1004 freq counter and put a bnc connector in the case and grounded it and ran a wire from the center terminal of the bnc and connected onto the wire that samples frequency that went around the bridge wire between the coaxial input of the freq counter. So now I don't have to have 2 coax jumper cables; 1 going from the transmitter to the freq counter and the other to the dummy load. It only requires 1 bnc jumper cable to the one I put on the side of the counter and it does a great job. I checked against my other jb-1002 fcm Wawasee and it is dead on in its sampling.