AOR AR-ONE Specifications download pdf (Page 21)

The speed at which the receiver steps up or down depends upon the STEP SIZE which is

default to AUTO. In AUTO the step size, receiver mode etc. is taken from the factory

pre-programmed band plan but may be overridden at any time.

Push the UP arrow key to tune the receiver upward in whichever step size is selected, use

the DOWN arrow key to tune the receiver downward in frequency.

2-5 Changing receive mode

Due to the necessities of signal bandwidth, channel occupancy and transmission efficiency.

Different receive modes are used by various services. In addition to this specification for

tuning step and receive mode are allocated by departments of Governments following

international discussions so are not consistent throughout the world. For this reason, it is

necessary to change receive mode in order to monitor various transmissions.

For your convenience, receive mode and tuning step size have been pre-programmed into

the AR-ONE auto-mode band plan data at the factory to simplify operation of the receiver,

especially while you familiarize yourself with all functions. Should you wish, the defaults

may

be manually overridden at anytime so that you may select an alternative receive mode and

tuning step on any frequency.

Amplitude Modulation – Used by broadcast services throughout the world on long wave,

medium wave and shortwave. AM is also used by VHF airband, UHF military airband and

some PMR (Private Mobile Radio) and utility services.

There are two common types of FM (Frequency Modulation, these are:

NFM – Narrow Band Frequency Modulation – this provides high quality communication for

relatively short distance operation. FM uses a greater frequency bandwidth than other

modes such as SSM so is less efficient.

NFM is the most common mode used above 30 MHz with the exception of the airbands.

NFM is widely used on the VHF bands: VHF marine band, 2m amateur band, 70 cm

amateur band, PMR (Private Mobile Radio) and utilities.

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AOR AR-ONE Specifications Page 21