After watching Gil's videos about the MR100 I bought one, calibrated it and started the WIN-PCC-Sark100-Software. Everything works fine, but when I scan my 50-Ohm-Dummy (homebrew bundle of 1/8W resistors in oil) from 1-52 MHz it shows a strange picture: from 1-4.6 MHz it's SWR 1:1, Z=R=50 Ohm, as it should be. From 4.6 MHZ until 52 the SWR increases in a zig-zag-curve up to 1:5.5, Z remains at 50 Ohms and R goes down to 12 Ohms. Very puzzeling.

Then I scanned a small 47-Ohm-resitor, and the reading are weird ups and downs in SWR, R and Z all over the frequency range. Shouldn't it stay in a line? How can I trust the MR100 when checking my antennas? What is your experience if you own the MR100 or the SARK100?
Please help!

73     Henry

P.S.: Can I post the graphics here (bmp)?