104
Radio Type
K4, K4D, or K4HD depending on installed hardware modules. If a K4D
or K4HD is detected and the option module is in use, then the K4D or
K4HD icons will appear (to the right of the RIT/XIT box).
Reference Frequency
Specifies the actual frequency of the K4's internal reference oscillator
(VCO). This value is calibrated at the factory. Once the value is
calibrated, VFOs will typically be accurate to within +/- 1 Hz.
This setting can be adjusted if it becomes necessary due to component
aging. For that purpose you'll need a known-accurate signal source
(such as WWV). You can use CW mode and SPOT while in the menu
entry to adjust the parameter until the incoming signal matches the
CW sidetone pitch.
If a stable external 10 MHz reference is in use (typically +10 dBm), "Ext
Ref Lock" will appear instead of the manually set reference frequency,
because the external reference is assumed to be accurate. If the
external reference is too low in amplitude for stable operation, a
warning will be displayed, and the K4 will continue to use its internal
10 MHz TCXO. Also see ER100 (Error Messages).
RIT CLR 2nd Tap Restore
When set to YES, taps of the [CLR] switch will alternately clear the
RIT/XIT offset, then restore it.
RIT Knob Alt. Function
Sets the function of the OFS knob when RIT and XIT are turned off
(NONE, VFO coarse tuning, or panadapter center frequency).
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