Basic Operations; Switching The Power On/Off; Adjusting The Volume; Squelch Level Setting - Alinco DR-638H Instruction Manual

5

Basic Operations

Important: The explanations herein are based on manufacturer's default
setting.

Switching The Power On/Off

Power On
Press key to turn on. Appears "ALINCO DR-
638" then displays current frequency or channel.
Power Off
Press key for over 0.5 Second to turn off.

Adjusting The Volume

Rotate the [VOL] knob of selected band clockwise
to increase the audio level, counterclockwise to
decrease.
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Rotate the SQL ring counterclockwise to hear the white noise to set the audio
level properly.

SQUELCH LEVEL SETTING

Rotate the [SQL] ring of selected band clockwise
to increase the squelch level, counterclockwise to
decrease.
A noise is heard at the minimum setting.
Squelch is to cut the white-noise in stand-by state.
Setting it too high may risk missing weaker signals but lower setting may
open squelch often hearing more noise. You should set the levels of both
MAIN and SUB bands before start operating.

Switch between VFO and MEMORY MODE

In standby, press or key to switch between VFO(Frequency)
and Memory mode. When in memory mode,
the memory channel number appears on the
left side of memory frequency.

Setting Frequency

In VFO mode, turn the dial clockwise to increase
frequency; Counterclockwise to decrease. Every
click will increase or decrease frequency by one
channel-step. To select MAIN and SUB band,
press the dial. Press
POWER
or [UP/DOWN] keys to change the frequency by
1MHz step.
The microphone
[UP/DOWN]
Press
size. Hold
Input Frequency THROUGH Microphone number key
In VFO mode, you can input the frequency by the numerical keys.
Out-of-the-band frequnecies are automatically rejected.
For example, to input 145.320MHz, press 1,4,5,3,2,0 sucsessively.
When completed, a decimal point appears at the MHz order.
When the Band lockout function is on, the operating ranges will be limited.

Setting CHANNEL

In memory mode, you can select the frequency by turning the dial.
Turn clockwise to increase, counterclockwise to decrease the channel
numbers. To switch the MAIN/SUB band, press the dial.
While a memory channel is shown in SUB band, [ ]icon appears.
key then turn the dial
[UP/DOWN]
key also able to adjust frequency.
key will increase(decrease) the frequency by one step
[UP/DOWN]
key will adjust the frequency continuously.