I bought Solar-Powered IoT Device Kit recently.
Is there a way to attach an antenna to the BLE transmitter of that kit to amplify the signal?
I've tried simple parabolic reflector after googling but that was not enough.
Thanks in advance.
There does not appear to be any sort of "Antenna output here" pins or wording, so my guess would be no.
The BLE chip has the antenna built into it from the factory, and on its own it has an external PA output pin that you can use to send the signal through an external amplifier, but that would involve manufacturing your own board and amplifier I think.