Specifications

Detail

5.2.6 Missing MMSI

Symptom: DSC operation is not working

Possible cause/remedy: When powering up the VHF for the first time after leaving factory

no MMSI identity resides in the VHF. For the DSC operation to function the VHF must be

programmed with MMSI identity (refer to menu 4.5.1).

5.2.7 Radio time

Symptom: DSC logs are sorted with wrong time stamp or radio time is incorrect

Possible cause/remedy: A wrong radio time indication should occur only if GPS position

source is not connected or providing correct time data. A valid GPS time signal will update

the UTC time used for time stamping the DSC logs.

If a GPS/position source is not connected to the VHF and hence position and time is entered

manually, it is necessary that the “radio time” also be entered manually, at least on powering

up of the VHF. This will ensure correct time stamping of the DSC logs.

The UTC time is the suggested time to be entered when prompted for entering position and

time manually (every four hours).

5.2.8 Channel not free

5.2.8.1 DSC Channel not free

Symptom: DSC transmission delayed

Possible cause/remedy: Transmission of a DSC call which is not of category distress or

urgency will be postponed if the VHF is already in the process of decoding an incoming DSC

call. As soon as this decoding process has finalized the transmission will take place.

5.2.8.2 Working channel not included in DSC call

Symptom: In a DSC station call a proposed working channel is included resulting from

scanning through a preset table of working channels. If, for some reason a free channel from

this table is not found withing 1 second, no proposed working channel will be included in the

DSC call.

Possible cause/remedy: If the squelch is at all times open the channels thus scanned

through will all be interpreted as occupied. Adjust for higher squelch setting to avoid this

situation.

5.2.9 Device failure

If any of the checks and tests described in this section do not assist in resolving any

difficulties experienced in the operation and/or performance of the VHF installation, a fault

may have developped in the VHF itself.

In seeking further assistance from an authorized Thrane & Thrane representative be sure to

provide as much information as possible in regards to the observed behaviour also including

the type of the VHF, its serialnumber (printed on type label or found in menu 4.6.1.2) and

software Main release version (menu 4.6.1.1).

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