Emerson ROC809 Instruction Manual page 155

Revised July-2017
 If a duplicate Network ID and Channel exists on the network, a
node may indicate connectivity to a Network but will not appear
in the Discovery list.
 A node will not appear on the Access Points Discovery list if there
is a second unit setup as an access point.
4. If you are still experiencing trouble with a Network Radio Module,
check for any possible physical interference from the environment:
 Raise antennas above obstructions like trees or compressors. For
best communication, the antennas must have line of sight.
 Mount antennas outside of metal enclosures. Antennas must have
at least 10 feet of vertical separation from other antennas.
 Check for mismatched antennas. Avoid using the incorrect
antenna for the frequency of radio. Make sure that the antenna
used is for the frequency range of the radio.
 Check if the cable runs are too long or if the cable is of the wrong
type. Less than 3 dB of loss for the entire cable run is
recommended. LMR-400 has 3.8dB of loss per 100 feet. The
recommended maximum is 75 feet.
 Waterproof all cable connections. If water gets into the cable, it
can cause high VSWR/antenna reflect power.
ROC800-Series Instruction Manual
Troubleshooting 6-15