User's Manual Part 1

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RF Settings
Optional IF Filter Enable
When enabled the optional IF filter (if physically fitted) is selected automatically
when AFSK or CW mode is selected. This is useful when the transceiver is used in
some data transmission applications.
Use the Scroll keys to select the setting required (example
shown “Enabled”):-
press the key
Note:- This setting is only available if the narrow filter setting is selected during
programming from the programming software.