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both main and sub RX are placed on the frequency of VFO A
(see DIVERSITY MODE). Sub receiver AF gain is controlled by the outer
concentric knob to the left of the LCD.
VFO B/sub can be set to a different band from VFO A/main (see DUAL
RECEIVE). In this case you may also wish to use dual panadapter mode
(see PANADAPTER). To enable independent band selection for VFO B,
set MENU:VFO B Different Band to YES.
The K4D model also allows the sub RX to use a different antenna from
main; this is described in the ANTENNA SELECTION section. Separate
antennas are required for DIVERSITY MODE, which is selected by
holding [DIV]. This sets the sub receiver to the same band and
frequency as VFO A, allowing the operator to hear the signal from the
two antennas in left and right channel audio, often improving copy in
fading conditions.
Receiver Controls
The middle row of switches above VFO A controls the most important
receiver settings, including [PRE] (preamp), [ATTN] (attenuator), [NB]
and [LEVEL] (noise blanker), [NR] and [ADJ] (noise reduction), [NTCH]
and [MANUAL] (notch filter), [FIL] (filter preset), and [APF] (audio
peaking filter). Tap [B SET] to set up the sub receiver.
For detailed information on these controls, see RECEIVER SETTINGS.
Message Play/Record Controls
In CW, PSK, and FSK modes, tapping [M1]-[M4] plays recorded
message text. Holding [M1]-[M4] does auto-repeat for both text and
DVR messages. Tap [REC] to enter message text; this brings up the
built-in alphanumeric keyboard. Also see CW Messages.
In speech modes, the message play and record buttons activate the
DVR (digital voice recorder). See DIGITAL VOICE RECORDER (DVR).
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