VHF Radio Signal Checks and Readability Scale

It is sometimes necessary to verify that your transmitter and receiver are operational. This can be done by:

1. establishing contact on the working channel and conducting your tests (the actual wording of the test is given in the example below), Continue reading

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Calling on VHF Radio

The calling examples used are sample call signs only.

Before transmitting, listen for a period long enough to ensure that harmful interference to transmissions already in progress is not likely to occur. If such interference seems likely, wait until the transmissions in progress are completed before making your call. Continue reading

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Expressing Numbers and Time on VHF Marine Radio

Numbers Expressed in Words

0 – ZERO

1 – ONE

2 – TWO

3 – THREE

4 – FOUR

5 – FIVE

6 – SIX

7 – SEVEN

8 – EIGHT

9 – NINE

. – DECIMAL

?,000 – THOUSAND

All numbers except whole thousands should be transmitted by pronouncing each digit separately. Whole thousands should be transmitted by pronouncing each digit in the number of thousands followed by the word THOUSAND.

10 becomes ONE ZERO

75 becomes SEVEN FIVE

100 becomes ONE ZERO ZERO

5,800 becomes FIVE EIGHT ZERO ZERO

11,000 becomes ONE ONE THOUSAND

68,009 becomes SIX EIGHT ZERO ZERO NINE

Time

The twenty-four hour clock system should be used in expressing time in the Maritime Mobile Service. It should be expressed and transmitted by means of four figures, the first two denoting the hour past midnight and the last two the minutes past the hour.

Some examples of time using the twenty-four hour clock system are shown below.

Some Times as Expressed by VHF Procedures

Time Expressed as

12:45 a.m. 0045 ZERO ZERO FOUR FIVE

12:00 noon 1200 ONE TWO ZERO ZERO

12:45 p.m. 1245 ONE TWO FOUR FIVE

12:00 midnight 0000 ZERO ZERO ZERO ZERO

1:30 a.m. 0130 ZERO ONE THREE ZERO

1:45 p.m. 1345 ONE THREE FOUR FIVE

8:30 p.m. 2030 TWO ZERO THREE ZERO

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Phonetic Alphabet for VHF radio

The words of the International Telecommunication Union (ITU) phonetic alphabet should be learned thoroughly. Whenever isolated letters or groups of letters are pronounced separately, or when communication is difficult, the alphabet can be easily used. When it is necessary to spell out words, the following table should be used. The syllables to be emphasized are shown in bold type. Continue reading

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VHF Marine Radio Operator

Procedures

The efficient use of VHF radio depends to a large extent on the operator’s method of speaking. As the distinctive sounds of consonants are apt to become blurred in the transmission of speech, words of similar length containing the same vowel sounds may sound alike. Special care is necessary in their pronunciation. Continue reading

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