AOR SDU5600 Specifications download pdf (Page 24)

5-4-2 Step resolution mode

Example of the screen is shown here, the parameters are:

Centre frequency (CF) = 122.5MHz

Display step = 25kHz

Frequency span = 8MHz

Start frequency = 118.5MHz

End frequency = 126.5MHz

Marker frequency = 124.35MHz

In the step resolution mode, the frequency

span is determined by the entry of display

step size, which is OPPOSITE to the

spectrum analyser mode where the

display step size is determined by the

entry of frequency span.

Centre frequency (CF)

Press the CENTRE FREQ. key to make

the centre frequency display read-out

appear in reverse contrast. Enter a

desired frequency via the ten-keys

followed by the kHz or MHz key, this is

now the centre frequency. The main dial

of the SDU5600 may also be used to

select a frequency, you must still use the

kHz or MHz key to complete the

frequency entry sequence.

Assuming that communication between

the SDU5600 and the companion

receiver has been correctly established,

the centre frequency of the SDU5600

becomes the receive frequency of the

companion receiver.

Display step (STEP)

Press the SPAN/STEP

special key

to reverse the contrast of STEP numeric display on the top line of the LCD.

Enter the frequency step size, using the ten-keys followed by the kHz or MHz key to confirm the entry. Once the frequency step has

been entered, the display step will automatically calculate the SPAN and display STEP and SPAN on the top line of the display.

Note: If you select a step size which is too large, the SDU5600 will default to 31.250kHz step with span of 10MHz... and

will produce an error beep (if the beep facility is enabled). If you select a step size which is too small, the SDU5600 will

default to 0.500kHz step with span of 0.160MHz... and will produce an error beep (if the beep facility is enabled).

Special key - CENTRE FREQ.

This hardware special key is a duplicate of the soft key CENTRE FREQ. and has identical action. Either key may be used to the

same effect.

Effective frequency coverage of the companion receiver

The frequency spread (both sides of the centre frequency) must be contained within the frequency coverage of the companion

receiver. If exceeded, correct monitoring will be impossible.

Display frequency bandwidth is obtained by the following formulae:-

In the spectrum analyser mode: CF +/- (Frequency span divided by 2)

In the step resolution mode: CF +/- (Display step x 160)

Example of the automatic calculation of frequency span

In the above illustration, the frequency STEP is 25kHz, so the SPAN is calculated by the SDU5600 as:

25kHz x 320 = 8MHz

where 320 is the horizontal x-axis resolution of the LCD.

Section 5-4-2

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AOR SDU5600 Specifications Page 24

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