Hello Yan, do you mean the pad marked in red in the picture below? I don't think that is the fault, it is just where the braid of the cable going to the TRX is grounded. See the pictures below.
I was wondering if the problem might lie in the HW changes that Anton/ZAO made to the original BOM. In a post lower down in this thread Anton writes:
??? 56,2 Ohm 1% resistor (1206), 2 pcs (to replace the original 50 Ohm ones)??? 287 Ohm 1% resistor (0603), 2 pcs??? 787 Ohm 1% resistor (0603), 2 pcs??? 1nF capacitor (0603), 2 pcs??? 10nF capacitor (0603), 2 pcs??? 1uF capacitor (0603), 2 pcs??? 10uF 16V tantalum capacitor (size A), 1 pcs
Also the pair of 47 kOhm resistors (0603, traces between the AD8361 outputs and the FWD, RFL test points) to be replaced with ~100 Ohm ones, or to be shorted alltogether.
There should be 10 turns in the "binocular" windings (instead of the original five turns).
(end of the citation)
I honestly have no idea if the increased number of turns on the binocular ferrite (10 instead of 5) must be and is reflected in the firmware.
I need to measure the voltages from the detectors on the test points. Can someone please advise me what voltages I should expect there or what voltages are expected by the firmware in the microcontroller?
73, Mat¨§j OK2MTB
