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"WIDE". This will remove QRM ahead of the noise blanker. The
optimal level setting may be different when the NB filter is engaged.
Note: The panadapter has its own noise blanker, affecting only the
behavior of the display. Use <DISPLAY> <NB> to select its mode. If the
panadapter blanker mode is AUTO, then it will turn on whenever the
receiver's noise blanker is turned on.
Noise Blanker Tip: On extremely noisy bands, the noise blanker will
often be far more effective if front-end gain is reduced. Try turning off
the preamp and even turning on the attenuator. This can keep noise
from hitting the AGC threshold, resulting in a much greater audible
difference between NB ON vs. OFF.
• Noise Reduction (NR): Tap [NR] to turn noise reduction on/off;
hold [ADJ] to adjust the noise reduction settings.
• Auto-Notch (NTCH-A): Tap [NTCH] to turn auto-notch on/off.
Applies only to speech modes.
• Manual Notch (NTCH-M): Hold [MANUAL]. Adjust the notch pitch
using VFO A. Applies only to CW and SSB modes. If both auto-notch
and manual notch are turned on, the icon changes to NTCH-A/M.
Advanced Receive Features
• If you're using both the left and right receive audio channels (i.e.,
with headphones or dual speakers), you can take advantage of the
K4's stereo audio effects. See AUDIO EFFECTS (AFX).
• All models of the K4 include simultaneous dual receive on any two
HF-6 meter bands. For details on sub receiver use, see DUAL RECEIVE.
• The K4HD model has a superhet front end that can benefit stations
in extremely high-signal operating environments. See HDR RECEIVE
(K4HD).
• The RX Dyn. Range Optimization menu entry can be used to
customize behavior of the K4's analog-to-digital converters (ADCs). In
general it should be left at the default setting of ON, which configures
the ADCs for best response to very strong signals. The OFF setting will
slightly improve preamp-off sensitivity. When dynamic range
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