Check forward power of the transmitter at the antenna. Check
back at the 8310 itself if there is no or low power at the antenna.
Make sure the antenna cable is OK.
Check the battery connection. Make sure it is made to the
external battery input and not the solar panel input.
Check the battery voltage during a transmission. The voltage
should not drop more than 0.5 volts during the transmission.
Make sure the voltage is greater than 10.5 and less than 14.9 volts.
The 8310 will not make a transmission if the voltage is outside
these limits.
Make sure fail-safe has not tripped - use System Status - display
status to check or look at recording status. .