I’ve got 2 T-Beams, 1.1 boards.
Both of them are running on 433Mhz, LongSlow and 20 dbm.
I’ve got the same antenna on both. I mounted one on a 4th floor window and I took the other for a walk with me.
My friend and I were texting each other successfully for about 300m. Beyond 300 metres, I was able to receive messages up to 1km (didn’t try to go further) but none of my messages were going back.
If I’m understanding everything correctly, if there are 2 boards with the same antenna and transmitting power, and I can receive a signal, I should be able to send the same signal on the same path right? Given the same obstructions and transmission power, my friend should have received my messages too?
I will try reversing the situation tomorrow by taking his board for a walk, and leaving mine on the window.
What do you guys think?