![]() If you are using rigCAT (i.e., a rig XML file containing command definitions and minimum and maximum allowable frequencies), an entry outside the limits will not be sent to the rig - the display will revert to the rig frequency following the next rig poll cycle. The number of digits that may be entered displayed is currently hardcoded to seven digits to the left of the decimal and three to the right. In addition to allowing you to set the rig frequency, it will track with changes made on the rig itself. The frequency display is also a control it displays frequency in kHz. The combo box on the right will allow the selection and control of the transceiver's receive filter bandwidth. The combo box on the left will allow the selection and control of the operating mode of the transceiver. The logged frequency value will only be correct for LSB and USB operation. This frequency value is used with the waterfall audio frequency to compute the logged frequency. If fldigi is being used with an FM transceiver you probably should enter the simplex frequency or the input frequency of a repeater being used. When no CAT is available the control is simply a convenient way of keeping track of the transceiver USB/LSB suppressed carrier frequency, the mode and the audio tracking point.
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