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2-3 Squelch Circuit
In normal use, LEVEL SQUELCH is used. However, VOICE SQUELCH can be selected for search and
scan operations. The LEVEL SQUELCH parameter sets the AR-ALPHA to check the signal strength of
active frequencies and to only stop when the signal strength is above a preset level (which is
programmable).
To select LEVEL SQUELCH, rotate the squelch knob clockwise until background noise disappears. The
squelch will open only when input signal strength is above this set level.
To select VOICE SQUELCH, Press the
left of the LCD screen.
Rotate the squelch knob until background noise disappears. The Squelch will open only when the
received voice audio level is above this set level. To return to LEVEL SQUELCH, repeat above steps.
2-4 VFO selection
The AR-ALPHA has five (5) VFOs being identified as "VFO-A" through "VFO-E" at the top left of the LCD.
The term VFO stands for 'Variable Frequency Oscillator' and in modern receivers refers to stored
tuneable data that contains frequency, step, step-adjust, attenuator etc. Each time VFO key is pressed,
one of the five available VFOs (A~E) is selected.
The AR-ALPHA has an AUTOMODE setting, which in most cases automatically selects the proper
receive mode, and frequency step.
, then press the 2 key. The VSQ icon will appear at the top
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