Selecting The Receive Frequency - AOR SDU5600 Operating Manual

Section 5-2-2

5-2-2 Selecting the receive frequency

This section will explain how to select and monitor the receive frequency of the companion receiver.
It must be noted that the SDU5600 employs the following principle:
Spectrum / Step Resolution - Receive Frequency (RX.FREQ) = Centre Frequency (CF)
Method 1: While the SDU5600 is in SPECTRUM MODE (default when first switched on) or STEP
RESOLUTION MODE, use the ten keys to directly enter the desired centre frequency, followed by
the kHz or MHz key to complete the sequence.
Method 2: Usually the main dial changes the position of the marker, however press the
CENTRE FREQ. soft key to display the CF legend in reverse contrast (as diagram
below), now you can alter the centre frequency by turning the main dial as well as via
the keypad . The frequency step in use is as selected by the SDU5600 (not the
frequency step selected in the receiver), 20kHz in the example below. While tuning the
receive frequency or CF by rotating the main dial there may be up to approx. 2
seconds of delayed response between the SDU5600 and the companion receiver.
Notes: If the companion receiver is of interactive type such as the AR5000 series the centre frequency can be operated
via the receiver's tuning dial (or keypad depending on level on inter-operability). The frequency step in such use is as
selected by the receiver (the diagram below shows a tuning step of 100kHz).
Receive frequency cannot be adjusted when the companion receiver has been selected as Other(10M) and Other(45M),
the soft keys change colour to dark blue and the main keypad will not initiate frequency entry... producing an error beep
if the feature is enabled. This is also true when communication between the SDU5600 and the companion receiver has
been disrupted.
Pressing the ten keys to enter the centre frequency in the following instances will be void:
ê When the FUNC legend is shown in reverse contrast.
ê When the companion receiver has been selected as Other.
ê
When the SDU5600 is in the marker mode following the key press of FUNC + MK.F keys.
ê While the SDU5600 is in a process of entering calculation data.
Once the entry by the ten-keys has been made, entry by the main dial is invalid. To resume the entry by the main dial press the CLR
key once followed by the CENTRE FREQ. key.
Centre frequency and Receive frequency step:
ê The frequency step shown on the SDU5600's screen is valid when operated by the main dial.
ê The frequency step selected by the companion receiver is valid when the SDU5600 is being controlled by the
companion receiver.
FUNC + 1
Spectrum
mode
FUNC + 2
Step
Resolution
mode
20