Specifications

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6-13-2 Configure audio LPF (low pass filter)
The audio low pass filter is useful to cut off high tones (allowing low tones to pass) to
improve intelligibility of weak signals in close proximity to adjacent interference and to
remove hiss making listening for extended periods easier on the ears.
There are four available pass frequencies: 3KHz, 4KHz, 6KHz and 12KHz.
The lower the frequency the more limited the audio bandwidth. For highest fidelity for
listening, select 12.0KHz. The filter selection can be set to auto mode to select the proper
filter setting automatically. The default is AUTO.
To access the configuration menu, push the FUNC key and then push the 7 key.
Push the down arrow key to move the cursor to the “LPF” selection point.
This menu is to configure the low pass filter.
Use the main tuning dial, the right arrow key or the left arrow key to select the desired high
pass filter setting (AUTO / 3KHz / 4KHz / 6KHz or 12KHz).
Push the ENT key to accept the data and return to a standard display. Alternatively, push the
ESC key to abort entry, or, push the down arrow key to move to the next item on the
configuration menu (De-Emphasis).
6-14 Configure Audio De-emphasis
This is really only applicable to FM mode and affects the sharpness of recovered audio.
The FM transmissions in different world areas have different defaults for de-emphasis.
For example, a value of 750 is selected in Europe, other settings may result in the recovered
audio sounding very muffled.
The available range is as follows: THRU, 25μS, 50μS, 75μS, and 750μS
The audio de-emphasis can be set to auto mode to select the proper setting automatically.
The default is AUTO.
To access the configuration menu, push the FUNC key and then push the 7 key.
Push the down arrow key to move the cursor to the “De-Emphasis” selection point.
This menu is to configure the audio de-emphasis.
Use the main tuning dial, the right arrow key or the left arrow key to select the desired
de-emphasis setting (AUTO / THRU / 25uS / 50uS / 75uS or 750uS).
Push the ENT key to accept the data and return to a standard display. Alternatively, push the
ESC key to abort entry, or, push the down arrow key to move to the next item on the
configuration menu (PRIO-CH).
6-15 Configure PRIO-CH (Priority Channel)
The priority function enables you to carry on scanning, searching or monitoring while the