Icom IC-7100 Advanced Instructions - Page 343

Previous view 18 DATA COMMUNICATION Adjusting the TNC output level When the data transmission speed is set to 9600 bps, the data signal coming from the TNC is applied exclusively to the internal limiter circuitry to automatically maintain band width. NEVER apply data levels from the TNC of over 0.6 Vpp. Otherwise the transceiver will not be able to maintain the band width, and your transmitted signal may possibly interfere with other stations. DDUsing a level meter or synchroscope When using a level meter or synchroscope, adjust the TX audio output level (DATA IN level) from the TNC as follows. 0.4 Vpp (0.2 Vrms): recommended level 0.2-0.5 Vpp (0.1-0.25 Vrms): acceptable level DDNot using a measuring device q Connect the TNC to the transceiver. (p. 18-2) w Enter a test mode ("CAL," and so on) on the TNC, then transmit some test data. e If the transceiver fails to transmit the test data, or transmits sporadically, (TX/RX indicator doesn't light or it flashes): - Decrease the TNC output level until the transmit indicator lights continuously. If transmission is not successful, even though the TX indicator lights continuously, increase the TNC output level. INFORMATION! When "RTTY" is selected as the "USB2/DATA1 Function" item option in the Set mode (SET(C) > Connectors > USB2/DATA1 Function), the USB port sends an RTTY decode signal. In this case, you must connect a USB cable* between the transceiver's USB port on the rear panel and the PC. (p. 17-25) *Purchase separately • T he USB driver and the installation guide can be down- loaded from our website. URL: http://www.icom.co.jp/world/index.html 18-5