I have problem with my 315Mhz SAW based transmitter if the battery is mounted at the backside underneath of the transmitter circuit. It's transmission power will attenuated at large size around -2dBm down to -40dBm.
Do you have any experience on this problem? You know it's quite headache, since I been using many types of battery sheilding material and ferrite beads, filters caps...still doesn't work!
Anybody there please help..thanks!