NAVTEX test

 

In the NAVTEX test mode, the test box can send NAVTEX messages on 490 kHz, 518 kHz or 4209.5 kHz to a NAVTEX receiver in order to check the receiver/printer.

 

Set Number

As you may wish to test several NAVTEX receivers, each receiver can be given its own individual set number for recognition. Default number is 1. Press OK to confirm or press  or  to change to another number. Then, press OK and go to the test.

Connect the wire antenna supplied with the test box to RF OUT and use this setup:

NAVTEX receivers (NAVTEX test_image1)

If the signal is not strong enough to enable the test, you may connect the RF Amplifier (optional accessory) as shown below.

1) In the Send mode, select frequency and press OK.
2a) Select Carr if you wish to send the un-modulated carrier. Press EXIT to stop transmission.
2b) Select Msg to send a pair of test messages – a navigational warning and a SAR message.
3) Use ↑ or ↓ to set the number of times you wish to transmit the test messages.
4) Use ↑ or ↓ to set the transmitter site letter in your NAVTEX message.
5) Press OK to send. The display will count down for every pair of test messages being sent. 
6) Check that the NAVTEX receiver receives/prints the following messages:
 

NAVTEX MESSAGE    XZ01 *                                  
0123456789ABCDEFGHIJKLMNOPQRSTU            
NAVTEX TEST SEQ BY FUTRONIC                        
GMDSS TEST BOX                                       
 

NAVTEX MESSAGE    XD00 *                                 
0123456789ABCDEFGHIJKLMNOPQRSTU            
NAVTEX TEST SEQ BY FUTRONIC                        
GMDSS TEST BOX                                       
SECOND TIME
FIRST MESSAGE ID 01

*) Transmitter site letter (X) may vary. Depends on your own setting.
The messages are identified by X = Transmitter site, Z = “No messages on hand” (for test purposes), D = SAR message, 00-99 = Message No.

Please note that the NAVTEX receiver may have been set to neglect routine messages with a transmitter ID letter and message number already received within a certain period of time. If so, a test signal from the test box may also be neglected. In order to solve this problem, the test box automatically adds 09 to every routine message number being sent. 

Changing the Transmitter ID letter in the test message may also solve the problem.

SAR messages are always received, even if they are transmitted repeatedly.

CONTACT
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