Operation
PRE AMP/ATT
The pre-amplifier can improve the receiving effect of some weak signals of high
frequency range and the sensitivity of the receiver.
1. Press [PRE] key at the bottom of the screen in a short time and the character
P will appear on the top left corner of the screen, indicating that the pre-amplifier
is turned on.
2. Press [PRE] key again in a short time and the character A will appear on the
top left corner of the screen, indicating that the pre-attenuator is turned on.
3. Press [PRE] key again in a short time and no character will appear on the
top left corner of the screen, indicating that the current state is shoot-through
state.
■
Before they are used in frequency range less than 14MHz, disabling the
pre-amplifier is recommended so that the radio can be in the shoot-through state,
which is conducive to strengthen the front-end performance of the receiver and
reduce the influence of interference signals.
■
When the S meter displays that the received signals exceed S9+20dB,
turning on the pre-attenuator is recommended to avoid the decreasing of the state
of the receiver due to strong signals.
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Pulse Interface Suppressor NB
Pulse interference suppressor can effectively eliminate some kinds of pulse
noise, especially the interference caused by automobile ignition system.
1. Press [NB] key at the bottom of the screen in a short time to enter the NB
function setting, and corresponding menu will display on the screen.
2. Continue to press [NB] key in a short time to select different NB function
setting menus, and rotate the main knob for setting.
The NB function menu includes the following options:
NBSW: NB function switch. Default OFF
NB Level: setting of NB suppression level.
NB Width: setting of NB suppression width
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