I am currently experimenting with LoRa communication and after getting some promissing results with the RFM95W on 868MHz i wanted to test the 2.4 GHz version of LoRa using the Nice-RF module SX1280 to be able to send more data.
After soldering the first two modules on some breadboard expansion pcbs and while checking my solder joints i wondered why the Antenna Pin seems to be connected to ground.
But when checking the other not yet soldered modules from my order the outcome is the same. Can anybody tell me what their experience was with this module?
The Datasheet is not mentioning that, so i am wondering if bought some faulty modules...
I do not see much information in the links you provided. But, the antenna pin could be connected to ground through an inductor and that would have no effect on the antenna you use.
good idea, in this case the continuation test with a multimeter would result in a connectivity reading as well.
I guess i can only know for sure when i actually tried to get a first sketch running and maybe it was just false alarm, will report back.
Most such devices use a 1/4 wave length antenna. An antenna must he 1/2 wavelength to be resonant. The missing 1/4 wavelength is all the components connected to the device ground. So your device will not operate properly without a ground connection to the antenna connection.
Hello everybody,
the modules seem to work fine, i managed to get some basic setup up and running - now i need to wait for the proper 2.4 GHz antennas and figure out the correct use of the sx12xx library (used sandeepmistry for the 868 lora so far) - but this topic can be closed - thanks to all for your responses.
The API interface for the SX127X devices and supported by the sandeepmistry library, is a lot different to the API needed for both SX128x and SX126x devices.