I have recently purchased nRF52840 dongle which I wanted to use as a ZigBee sniffer. I bought it on AliExpress and it supposed to be original Nordic board, but it turned out to be a copy made in China. After programming it with Sniffer firmware I saw that no packets are received - the led is flashing that it is in packet capturing mode.
Then I tried to compile (with a difficulty) some BLE sample programs included in SDK to see whether BLE is working, but it doesn't work as well.
My assumption is that the radio peripheral is not working. I am not sure how else I could check the radio. I have never used nRF products before.
I had a look at the dongle board and there is one thing that I am not sure of. I measured resistance between R0 (antenna input) and the ground - see the picture below. The resistance is 0 Ohms. Since there are only capacitors that are connected to the ground from the antenna to the IC pin, I don't know why the resistance is 0. Unless there is something internal (inductor) inside that chip that would create this value.
Could anyone advise what resistance should I expect at this point? If 0 Ohms resistance is correct what else can be the problem with the radio?
I would appreciate any help.
