Table 6-3. Secure Net Radio Interface Unit

TB 11-5820-890-10-7

S-16

MS/RATE

COMSEC Mode

Interface

Radio/Ext Audio Delay

Cypher

Radio Cypher/Plain

Table 6-3. Secure Net Radio Interface Unit

System Troubleshooting Procedures. These steps will assist you in isolating faulty system components

when you have a problem communicating in a net using data transmission. These procedures assume

that the net and secure FH voice communication has been established. If you are unable to communicate

using data transmission, do the following troubleshooting steps in the order provided.

CHECK LOCAL RADIO. Use the data radio on the FH voice net to determine that the radio net is

operating.

CHECK WITH OTHER NET MEMBERS. Do you have data communication with some stations but

not others? The other station may be out of range, temporarily off the air, or has not checked into

the net. If data communication can be established with another station, your system is probably

OK and the problem may be at the distant net station.

CHECK SYSTEM CONFIGURATION. Verify proper cabling, initialization and subscriber parameters,

radio set and KY-90 switch settings, etc.

NOTIFY MAINTENANCE. If the problem cannot be isolated, notify unit maintenance personnel and

inform your NCS of your communication problem.