I can post photos, but may I ask why?
The present PCB is prototype and I am just preparing another version of the board, so the next one will be different to this one, this is why I am asking about PCB layout considerations for the RAK4200.
I am having trouble with the LoraWAN communication.
I have tried various antennas and have poor performance. One unit is joining on occasion and the other never joins. So I am thinking it may be due to the layout of the PCB is not good for the RF
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I have added an external IPEX connector to the RF pin on the RAK4200 module as per the recommended layout.
How do I configure the RAK4200 in software to use the external RF pin.
I see in the data sheet that the onboard IPEX is the antenna connection by default, but I can’t find any guidance on making the RAK4200 use the external RF connection.
Hi @nmcc,
yes I would try it, but I haven’t got U.fl to SMA antenna cable adaptor. I will have one and try.
If succesful, Do you advise not to use RAK4200 RF OUT PIN without matching circuit ? Practically, how effects a short 1cm pcb trace at 868Mhz ? RAK811 had no trouble.
I haven’t had much luck yet with using the RF Out Pin. I have a matching circuit as per the schematic from RAK, but I haven’t worked out the components that I need to use yet.
I have a VNA, I just need to do some setups and some calculations to get the match correct.
@nmcc thank you,
Using RF PIN and a second pcb connector for antenna was a good static mounting option in my design. I have no more RF knowledge/instruments to calculate and analyze a pi matching circuit. But I was unlucky.
I will try U.fl connector and share the range test result here.
Your module is (H) version with iPEX (uFl) connector. This means that the RF pin is connected there. You need to use the connector for the antenna. We have another module that has no IPEX connector and there you can use Pin12.
@leanofis thank you so much for your follow up and sharing your answer.
I have wasted so much time with this. The manual should read PIN(12) RF Port (NC) RF out by IPEX only.
RAKWireless using the word default led me to believe that there was another option to use the RF pin and in that context that (reserved) only meant that the pin was not a general purpose pin, i.e. reserved for RF output