Custom boards based on LoRa-E5 and RAK3172

End Devices (Nodes) Hardware
42

Thanks, good info. For some of my ideas/applications 10 days would be good enough.

43

FYI LoRa-E5 module peak when transmit is 80mA (EU868) I now use RAK3172-SIP which peak 40mA for EU868 due to a correct design

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44

Dear @Charles, does the RAK3172-SIP need impedance matching in the antenna output? or is it internally matched for 50ohm?

45

It would be a surprised if the ‘antenna’ output of the RAK3172 was not designed for the direct attachment of an antenna.

46

Thanks @LoRaTracker…I mean the RF output of the RAK3172-SIP, not the RAK3172.

47

Globally they are always matched for 50Ohm, but after it depends of your board (size, thickness, …), routing traces and the antenna you use.
In all case you need to check matching. I had example with correct 50 Ohm traces and UfL about 5cm after chip output, Used some commercial antennas, some where matched correctly other not, surprising isn’t it?

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