Correct positions of the diodes


I have two CN101L's, both from different brands. One's response was extremely non-linear and it turned-out that a silicon and a germanium diode were interchanged on the PCB board. With de diodes on the proper place the meter corresponds normal. Then I calibrate both meters on 14.25 MHz on each range with a BIRD 43. The trim-pots on the board are indicated with 'L', 'M' and 'H'. The meters are now very accurate in the 80 - 15m range, they can match the BIRD. The deflection of the needle is about 10% less on 10 and 160 m.