I'm working with Xbee Pro with wire antenna to transmit data from inside a refrigerator. The receptor outside is the Xbee with RPSMA antenna. I use an extern MCU to control the data transmission, transmitting every second.
When temperature is about 4 °C or higher, the reception is ok, every second I get the data. But when the temperature drops from that point, reception starts to be poor, starting to receive each 5 seconds or less.
The transmitter is reporting the Not Ack Received notification. The input voltages seem to be fine (3.3 V) and both the Xbee and MCU are working.
Does temperature affect the transmission or the antenna in any way? Should I change the antenna of the receiver or transmitter?