AOR AR-ALPHA, Operating Manual

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An appropriate IF filter is automatically selected in the AUTO MODE. However any combination of IF
filter and receive mode is possible in the manual mode. When you have manually selected an IF filter
bandwidth, AUTO MODE will be deactivated, but the receive mode, step size, etc. will be retained until
they are changed manually.
2-7-1 Manually selecting IF bandwidth
Press the key, then press the 0 (zero) key.
The IF Bandwidth (IFBW) select screen will appear on the LCD.
Select a new bandwidth from the list of 200, 500 Hz, 1, 3, 6, 15, 30, 100, 200, and 300 kHz by rotating
the sub dial key. The selectable IF bandwidth is displayed in white. Other parameters may be selected
(displayed in blue), however, they may not be suitable for the particular receive mode in use.
To accept the new bandwidth selection, press the MHz key.
2-8 ATTENUATOR
Activating the attenuator reduces signal to the RF input stages of the AR-ALPHA to prevent overloading
in cases where the receiver is used in close proximity to strong transmissions.
The AR-ALPHA has five settings for ATT (attenuator), AMP ON 0 dB , AMP OFF 0 dB , 10 dB , 20 dB and
AUTO .
To change the ATT parameter setting, press the key, then press the 1 key.