CAP 413 Radiotelephony Manual
Chapter 2 Page 4
b) All numbers used in the transmission of altitude, height, cloud height, visibility and
runway visual range information which contain whole hundreds and whole
thousands shall be transmitted by pronouncing each digit in the number of
hundreds or thousands followed by the word HUNDRED or TOUSAND as
appropriate. Combinations of thousands and whole hundreds shall be transmitted
by pronouncing each digit in the number of thousands followed by the word
TOUSAND and the number of hundreds followed by the word HUNDRED;
examples of this convention are as follows:
1.4.3 Numbers containing a decimal point shall be transmitted as prescribed in 1.4.1 with
the decimal point in appropriate sequence being indicated by the word decimal.
1.4.4 All six figures shall be used when identifying frequencies irrespective of whether they
are 25 kHz or 8.33 kHz spaced. Exceptionally, when the final two digits of the
frequency are both zero, only the first four digits need be given. In technical terms an
8.33 kHz frequency is referred to as a “channel”, however the word “channel” is not
used in RTF. Military phraseology for identifying UHF frequencies appears in Chapter
10 paragraph 2.1.
1.4.5 When it is necessary to verify the accurate reception of numbers the person
transmitting the message shall request the person receiving the message to read
back the numbers.
1.5 Transmission of Time
1.5.1 When transmitting time, only the minutes of the hour are normally required.
However, the hour should be included if there is any possibility of confusion. Time
checks shall be given to the nearest minute and preceded by the word 'TIME'. Co-
ordinated Universal Time (UTC) is to be used at all times, unless specified. 2400 hours
designates midnight, the end of the day, and 0000 hours the beginning of the day.
Table 4
Number Transmitted as Pronounced as
10 One Zero WUN ZERO
100 One Hundred WUN HUN DRED
2 500 Two Thousand Five Hundred TOO TOUSAND FIFE HUNDRED
11 000 One One Thousand WUN WUN TOUSAND
25 000 Two Five Thousand TOO FIFE TOUSAND
Table 5
Frequency Transmitted as Pronounced as
118.125 One One Eight Decimal One Two
Five
WUN WUN AIT DAY SEE MAL
WUN TOO FIFE
119.050 One One Nine Decimal Zero Five
Zero
WUN WUN NINER DAY SEE MAL
ZERO FIFE ZERO
122.500 One Two Two Decimal Five WUN TOO TOO DAY SEE MAL FIFE
118.000 One One Eight Decimal Zero WUN WUN AIT DAY SEE MAL
ZERO
31 March 2011
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