3.2 RT SETUP
3-6
1. NB (ON/OFF)
The noise blanker (NB) is set to ON or OFF. The noise blanker, U15 on TX/RX board
(05P0466) reduces pulse noise. In J2B (DSC and NBDP) and J3C (FAX) modes, the
noise blanker is automatically set to OFF and no indication appears on the display.
2. SQ FREQ. (500 Hz-2000 Hz)
The squelch circuit is controlled by AF signal in frequency, but not in the receiving
signal level. The frequency lower than the preset value is recognized as audio signal and
the higher frequency as noise.
In J2B (DSC and NBDP) and J3C (FAX) modes, the SQ is automatically set to OFF and
no indication appears on the display.
The C-CPU in the controller unit generates MUTE signal by which the input signal of
the AF power amplifier, U7 on T-IF board is switched on and off.
3. FAX RX ENABLE (ON/OFF)
The weather FAX is set to ON or OFF. When FAX RX ENABLE is set to ON, the
MODE pop-up menu contains “FAX” line. The FAX signal, 1900Hz+400Hz, 0dBm/600
Ω is connected to #10 and #11 of [REMOTE] port.
4. USER CH (USER CH ENTRY)
See page 3-11.
SQ is on 0.5 seconds after no
audio signal is detected.
SQ ON
Audio signal
SQ OFF
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