User's Guide

SYSTEM RESET
75 The system reset command resets the radio resulting in all options, channel and synthesiser
calibration information being lost. Before further use, and following this command, an auto-calibrate
procedure must be carried out (see paragraph 77).
76 The system reset key sequence 91, (SHIFT s), RESET resets the radio and returns it to a known
state. After a system reset (plus auto-calibrate) frequency and channel settings must be re-entered.
AUTO-CALIBRATE
77 The auto-calibrate routine recalibrates the synthesiser lock times, and needs to be initiated after a
system reset. (A system reset clears the equipment of all stored data). To initiate the auto-calibrate
routine, use the following procedure:
(a) Ensure the step auto-calibrate size is 25 kHz (0.025 MHz). The key sequence is
0.0 2 5, (SHIFT s), FREQ
(b) Initiate auto-calibrate. The key sequence for this is: 91, AUX C
(c) Set the radio to the lowest available frequency, 100 MHz (VHF or VHF/UHF radio) or
225 MHz (UHF only radio).
(d) The equipment will then go through the calibration routine which takes approximately
10 minutes. During this time, the frequency display shows Calib, the channel display shows
ON and the monitor display increments from 1 to 100 to give a progress indication.
(e) When the equipment has stepped through all UHF and VHF channel frequencies (all
channels have been calibrated when the frequency display returns to the original frequency
display), stop the routine by switching off the radio. Auto-calibration can be stopped by
entering 91, AUX C.
(f) Re-enter any required channel frequencies. The radio is now ready for operational use.
GUARD RECEIVER OPERATION
78 The GUARD mode function is only available when the guard receiver option is fitted. Selection of
the guard receiver is achieved by selecting the guard ON key to the on position (shown by the adjacent
indicator being lit).
79 The guard receiver will continuously monitor the international VHF distress frequency of 121.5 MHz
when the main receiver is set to a VHF frequency or the UHF distress frequency of 243 MHz when the
main receiver is set to a UHF frequency. When a signal is detected on the guard frequency the indicator
adjacent to the guard MUTE key will light and the audio will be heard in the loudspeaker, headset, or
through the guard receiver’s audio output that is available on the facilities 2 connector.
80 When a distress broadcast is received through the guard receiver, the operator can select the
distress frequency as the equipment’s operating frequency by using the channel recall procedure, or the
frequency selection procedure.
Section 4 3000DV2 Radios
Page 20