AOR SDU5600 Specifications download pdf (Page 20)

The bottom line of the LCD displays the icon “STEP SET” to indicate that the AR-ONE is

Waiting for you to change the step size.

Use the main tuning dial or arrow key to select the desired step size. To accept the displayed

tuning step size, push the ENT key.

The tuning step size can be programmed in 1 Hz increments (via the keypad) so unusual

step sizes are possible.

The acceptable step size range is less than 1 MHz in 1 Hz steps.

2-7 IF Bandwidth

The IF bandwidth determines how SELECTIVE the receiver will be when monitoring signals

off air. However, it is not simply a case of using the narrowest filter at all times, particular

modes require differing amounts of bandwidth in order to operate, otherwise the receive

system simply will not produce intelligible sound. Correct receive mode and IF bandwidth

must always be selected for optimum reception. If the bandwidth selection is too narrow,

distortion or signal break-up may occur. If the bandwidth selection is too wide, adjacent

interference may be encountered. For this reason, a selection of IF filter bandwidths are

fitted as standard.

Typical examples of receive mode and IF bandwidth are:

300 KHz -- VHF FM broadcast (220 KHz may be also be used – mono only).

200 KHz -- VHF FM broadcast (110 KHz may be also be used – mono only).

100 KHz or 30 KHz – Wireless mic, etc. (30 KHz for satellite FAX, too).

16 KHz – PMR, amateur band, etc. FM 6 KHz may also be used.

8.5 KHz or 6 KHz – VHF/UHF airband, shortwave, medium & long wave, PMR, etc.

3 KHz – Short wave amateur band, short wave utility such as oceanic airband etc.

0.5 KHz – Morse code used by radio amateurs and some marine traffic on shortwave.

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AOR SDU5600 Specifications Page 20