Icom IC-7100 Quick Start Manual page 4

D. Operating Mode
The current mode of operation (FM, LSB, USB, etc.) is displayed at the top edge of the
screen. Touch the mode indicator to access a popup screen to change the operating mode.
On the popup screen, there are a number of soft keys for selecting the various modes.
• Pressing the SSB button toggles between USB and LSB.
• Press FM for operation on 2m or 70 cm.
• For Winlink operation, pressing the DATA button on the mode select popup
screen rotates through four possible data modes. When accessing a local RMS
Gateway on 2m or 70 cm, choose the FM DATA mode (FM-D is what shows on
the screen). For HF Winlink, you would choose the USB DATA mode regardless
of which HF band you are using. However, note that we don't intend to operate
HF at Holy Cross-Germantown, given our antenna situation.
The difference between "regular" FM and FM-DATA mode is that the microphone audio
is muted in FM DATA mode. So, if you can't get through on a voice channel and you
hear a report that "someone is transmitting an unmodulated carrier, touch the mode
indicator and the data button to exit FM DATA mode.
You can run Winlink using the "regular" FM mode, but background noise in the room
may be picked up by the microphone and corrupt the audio from the TNC.
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