ITU-R TF.768-2: Recommendation for Standard Frequency and Time Signal Broadcasts | Study Guides, Projects, Research Voice

Rec. ITU-R TF.768-2 1

SYSTEMS FOR DISSEMINATION AND COMPARISON

RECOMMENDATION ITU-R TF.768-2

STANDARD FREQUENCIES AND TIME SIGNALS

(Question ITU-R 106/7)

(1992-1994-1995)

Rec. ITU-R TF.768-2

The ITU Radiocommunication Assembly,

considering

a) the continuing need in all parts of the world for readily available standard frequency and time reference signals

that are internationally coordinated;

b) the advantages offered by radio broadcasts of standard time and frequency signals in terms of wide coverage,

ease and reliability of reception, achievable level of accuracy as received, and the wide availability of relatively

inexpensive receiving equipment;

c) that Article 33 of the Radio Regulations (RR) is considering the coordination of the establishment and

operation of services of standard-frequency and time-signal dissemination on a worldwide basis;

d) that a number of stations are now regularly emitting standard frequencies and time signals in the bands

allocated by this Conference and that additional stations provide similar services using other frequency bands;

e) that these services operate in accordance with Recommendation ITU-R TF.460 which establishes the

internationally coordinated UTC time system;

f) that other broadcasts exist which, although designed primarily for other functions such as navigation or

communications, emit highly stabilized carrier frequencies and/or precise time signals that can be very useful in time and

frequency applications,

recommends

1that, for applications requiring stable and accurate time and frequency reference signals that are traceable to

the internationally coordinated UTC system, serious consideration be given to the use of one or more of the broadcast

services listed and described in Annex 1;

2that administrations responsible for the various broadcast services included in Annex 2 make every effort to

update the information given whenever changes occur. (Administrations are also requested to send such information to

the Bureau international des poids et mesures (BIPM).)

ANNEX 1

Characteristics of standard-frequency and time-signal emissions in allocated bands

and characteristics of stations emitting with regular schedules with

stabilized frequencies, outside of allocated bands

1The characteristics of stations appearing in the following tables are valid as of November, 1991 for Tables 1

and 2 and as of April, 1993 for Table 3. For information concerning changes which may have occurred since that date,

reference may be made to the Annual Report of the time section of the Bureau international des poids et mesures (BIPM)

or directly to the respective authority for each service as listed in Annex 1.

ITU-R TF.768-2: Recommendation for Standard Frequency and Time Signal Broadcasts, Study Guides, Projects, Research of Voice

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Rec. ITU-R TF.768-2 1

SYSTEMS FOR DISSEMINATION AND COMPARISON

RECOMMENDATION ITU-R TF.768-

STANDARD FREQUENCIES AND TIME SIGNALS

(Question ITU-R 106/7)

Rec. ITU-R TF.768-2 (1992-1994-1995)

The ITU Radiocommunication Assembly,

considering

a)that are internationally coordinated; the continuing need in all parts of the world for readily available standard frequency and time reference signals

b)ease and reliability of reception, achievable level of accuracy as received, and the wide availability of relatively the advantages offered by radio broadcasts of standard time and frequency signals in terms of wide coverage,

inexpensive receiving equipment;

c)operation of services of standard-frequency and time-signal dissemination on a worldwide basis; that Article 33 of the Radio Regulations (RR) is considering the coordination of the establishment and

d)allocated by this Conference and that additional stations provide similar services using other frequency bands; that a number of stations are now regularly emitting standard frequencies and time signals in the bands

e)internationally coordinated UTC time system; that these services operate in accordance with Recommendation ITU-R TF.460 which establishes the

f)communications, emit highly stabilized carrier frequencies and/or precise time signals that can be very useful in time and that other broadcasts exist which, although designed primarily for other functions such as navigation or

frequency applications,

recommends

1 the internationally coordinated UTC system, serious consideration be given to the use of one or more of the broadcast that, for applications requiring stable and accurate time and frequency reference signals that are traceable to

services listed and described in Annex 1;

2 update the information given whenever changes occur. (Administrations are also requested to send such information to that administrations responsible for the various broadcast services included in Annex 2 make every effort to

the Bureau international des poids et mesures (BIPM).)

ANNEX 1

Characteristics of standard-frequency and time-signal emissions in allocated bandsand characteristics of stations emitting with regular schedules with

stabilized frequencies, outside of allocated bands

1 and 2 and as of April, 1993 for Table 3. For information concerning changes which may have occurred since that date, The characteristics of stations appearing in the following tables are valid as of November, 1991 for Tables 1

reference may be made to the Annual Report of the time section of the Bureau international des poids et mesures (BIPM)or directly to the respective authority for each service as listed in Annex 1.

Rec. ITU-R TF.768-

TABLE 1

(1))^

ATA

′^ N

′^ E

8 (PEP)

1, 1^000

4/^

±^10

BPM

′^ N

′^ E

2.5,5,10,^15

1, 1^000

20/30(UTC)4/30 (UT1)

±^10

HLA

′^ N

′^ E

(5)^5

(6)^7

±^10

IAM

′^ N

′^ E

±^10

(7)JJY

′^ N

′^ E

2.5,5,8,10,^15

±^10

LOL

′^ S

′^ W

3/^

±^20

′^ N

′^ E

T^

2.^

1, 1^000 (12)

4/^

±^ 1 000

Rec. ITU-R TF.768-

=^ +^

Rec. ITU-R TF.768-2 5

ATA^1000 A 1000 A 1000 A 1000 A

BPM (1)^ (1)^ (2)^ (1)^ (1)^ (2)

IAM A A A A A A A A A

JJY^1000 A 1000 A 1000 A 1000 A 1000 A 1000 A