I have had several replies about the NB, and I thank all of you The only difference that I see in the 2 radios, is the firmware. Mine is 2003 and the other one is 1820 something. If anyone is using 2003 and is using the NB, can you tell me if it works on your radio? Defective NB maybe? Everything is OK according to the manual in configuration. Thanks,73 Paul K9OT