Chapter 3: Service & maintenance
50
Maintenance
Salt deposits
In case the equipment has been exposed to sea water there is a risk of salt
crystallization on the keys and knobs and they may become inoperable. Clean
the MF/HF radio and speaker microphones with fresh water.
Weekly installation check
Go through the following weekly check procedure:
1. The Antenna Tuning Unit will tune automatically to the antenna first time
the equipment is keyed on a new frequency or when the PTT button is
pressed. During the tune sequence and normal transmission all transmitter
circuits are monitored to ensure safe operating conditions. If transmission
conditions are bad (bad antenna installation, high temperatures, etc.) the
transmitted power will be reduced to a safe limit. If the transmission
condition is improved automatic recovery to full power takes place.
2. If a GPS is connected, check the position and time in the MF/HF radio’s
display. If time is not contained in the NMEA sentences the time of position
is indicated as —:—. In this case check if the GPS output setting can be
changed to allow time information. Otherwise UTC time must be entered
manually each time the transceiver is switched on.
3. Send a DSC call to the appropriate coast station. The acknowledgement
from the coast station is received by the 2187.5 kHz watch receiver if the call
was sent on that frequency. If the call is sent on HF only the audio signal
output from the 2187.5 kHz watch receiver should be checked.
Error messages and warnings
Errors and warning messages are shown in the display and are read-only. The
messages contain instructions how to proceed.
