Is it necessary to modify the DR-135 to operate packet at 9600 bps ?
No. A simple software command sets the EJ-41U into 9600 mode. The correct insertion and monitoring connections are designed into the DR-135. CAUTION! 9600 bps packet operations are not “plug and play” with many OTHER BRANDS AND MODELS of radios. Deviation and equalization settings are critical, particularly when using an external TNC. It may be necessary to properly set those units using instrumentation such as an oscilloscope to achieve best results. DR135 eliminates such hassle.