tx-saw mid/5v ttl
still me with the module problems.
How can I be sure that they are functioning? I connected to a function generator and a source but without any caps. The problem is that I wasn't paying much attention and the function generator was generating -1.5V -- +1.5V instead of 0V -- 3V; also I saw on the scope that there were many spikes, reaching even 4V (and maximum voltaje allowed is 3.5V); and there were many gnd pins and I connected them all, not just one. also, enable and vdc from the 3V voltage source.
I also put small 16.4cm antennas, the rx and tx were at 2-3m apart, but nothing. just noise.
after many hours I put them on the same test board, with vdc and gnd comming from the same source. I connected just one gnd pin (there are 3 on rx) After a few tries the out data was 800mV and constant, I don't know how. After other tries this was the best result, in the attachement. which is not that great, and it could be from other reasons, they were only a few cm apart.
what should I do? are they broken? or I don't know how to test them? (it's very possible)