If the mounting rack is loose and will wiggle try looking at the space in the front of the front panel of the radio and the rack as you push the rear up and down you will see the nature of the problem. If the above criteria are not met the radio will probably not work properly and will be intermittent. This means that the case must also be square in the panel, becausr if the rack is even slightly tilted down in the back the short pins will not make up properly. The terra is a fairly tall radio and the box it mounts in needs to be mounted so that the front edge is fully flush with the front of the panel so that the radio goes completely into the rack. The Terra radio has a problem in that it has to be carefully installed to insure that the connectors are fully engaged. Terra Corporation TXN 960 Nav-Comm-Ecdi Operation/Installation (part TEYXN960) Avionics Manuals: Terra Corporation Part No. It'll tell you if your radio is transmitting at advertised power and if your antenna installation is bouncing it back(bad SWR) that about all I can think of off the top of my head, good luck. If you can get access to a basic watt meter you can find out if your antenna installation is a problem.
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