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VFO A, normally, but you can also offset VFO B by any desired amount,
which will be preserved as VFO A is tuned.
<AFX>: Turns audio effects on or off. Holding this button selects the
AFX mode: DELAY (simulated stereo) or PITCH (low-to-high audio pitch
mapping from left to right when used with stereo headphones or dual
external speakers).
<AGC>: Selects AGC slow (AGC-S) or fast (AGC-F) for the current
operating mode. Holding this button turns AGC on or off (AGC-). Also
see MENU:AGC Decay, Fast and MENU:AGC Decay, Slow.
Note: When AGC is off, protection from excessive audio levels is
provided by an audio limiter (AF Limiter).
The remaining <MAIN RX> secondary functions are defined for some
operating modes, as described below.
CW
<APF BW>: Sets the bandwidth of the audio peaking filter to 30, 50,
or 150 Hz. 30 and 50 Hz provide more noise rejection, while 150 Hz
allows for faster code speeds.
<TEXT DECODE>: Tap this button to turn text decode on/off and set
the number of receive text lines. Threshold defaults to AUTO, but you
can select a fixed value threshold value to minimize decoding of noise
as characters. Also see CW Text Decode and Built-In Data Modes.
PSK, FSK, AFSK
<TEXT DECODE>: Same as CW text decode, but without variable
threshold.
SUB RX
The <SUB RX> button group provides access to the same secondary
functions as <MAIN RX>, except that the operating mode of VFO B/sub
RX applies.
You can also tap <SUB RX> as an alternative to tapping the [B SET]
switch. Both enter B SET mode, switching the multifunction knobs and
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