1988 No. 70*1* STANDARD UNDER THE RADIOCOMMUNICATIONS ACT 1983
*1* Notified in the Commonwealth of Australia Gazette on 29 April 1988. 1988 No. 70 STANDARD UNDER THE RADIOCOMMUNICATIONS ACT 1983 - LONG TITLE
FOR RADIOCOMMUNICATIONS EQUIPMENT USED IN THE
CITIZEN BAND RADIO SERVICE AND OPERATING ON
FREQUENCIES NOT EXCEEDING 30 MHz
1988 No. 70 STANDARD UNDER THE RADIOCOMMUNICATIONS ACT 1983 - PART I
PART I-PRELIMINARY
1988 No. 70 STANDARD UNDER THE RADIOCOMMUNICATIONS ACT 1983 - REG 1
Citation
1. This standard may be cited as "Ministerial Standard 312".
1988 No. 70 STANDARD UNDER THE RADIOCOMMUNICATIONS ACT 1983 - REG 2
Commencement
2. This standard shall come into operation on 1 May 1988.
1988 No. 70 STANDARD UNDER THE RADIOCOMMUNICATIONS ACT 1983 - REG 3
Interpretation
3. (1) In this standard unless the contrary intention appears-
"A3E" means an emission whose basic characteristic is that of a double
sideband, amplitude modulated single channel carrier containing primarily
analogue telephony information;
"ALC" means automatic level control;
"ALC threshold" means the operating point on a transmitter output power
characteristic at which an increase in the modulating signal level does not
cause a proportional increase in output power;
"CB radio" means a radiocommunications transmitter or receiver used or
intended for use only in the Citizen Band Radio Service;
"Citizen Band Radio Service" means a two-way radiocommunication service
within the mobile service used for personal radiotelephone communications over
short distances within Australia or the Territories of Australia;
"dB" means decibel;
"dBm" means decibel relative to one milliwatt;
"device" means a device to which this standard applies;
"emission" means radiation produced, or the production of radiation, by a
radiocommunications transmitter;
"Hz" means Hertz;
"J3E" means an emission whose basic characteristic is that of a single
sideband, amplitude modulated suppressed carrier on a single channel
containing primarily analogue telephony information;
"kHz" means Kilohertz;
"MHz" means Megahertz;
"multi-role device" means a device which is or includes a
radiocommunications transmitter and which is capable of operation on:
(a) frequencies not exceeding 30 MHz allocated to the Citizen Band Radio
Service; and
(b) any other frequencies;
"out-of-band emission" means an emission which results from the modulation
process on a frequency or frequencies outside the permitted bandwidth, but
excluding spurious emissions;
"permitted bandwidth" means:
(i) the 8 kHz band centred on the operating carrier frequency, where
the transmitter operates in the A3E emission mode; or
(ii) the 4 kHz band centred on a frequency 2 kHz above the suppressed
operating carrier frequency, where the transmitter operates in the J3E upper
sideband emission mode; or
(iii) the 4 kHz band centred on a frequency 2 kHz below the suppressed
operating carrier frequency, where the transmitter operates in the J3E lower
sideband emission mode;
"pX" means peak envelope power;
"radiation" means the outward flow of energy from any source by means of
radio transmission;
"radio transmission" has the same meaning as in section 3 of the
Radiocommunications Act 1983;
"radiocommunications transmitter" has the same meaning as in section 3 of
the Radiocommunications Act 1983;
"rated peak envelope power" means the peak envelope power at the transmitter
output with a modulating signal comprising two non-harmonically related
sinusoids, in the frequency range 300 to 3000 Hz inclusive, at a level of
modulation so that:
(a) the transmitter is operating 10 dB above the ALC threshold; and
(b) the radio frequency sidebands corresponding to the modulating
signals are of equal level;
"receiver" has the same meaning as in section 3 of the Radiocommunications
Act 1983;
"reference sideband power" means the level of radio frequency sidebands
produced when a transmitter is operating at rated peak envelope power;
"spurious emission" means an emission on a frequency or frequencies which
are outside the permitted bandwidth and the level of which may be reduced
without affecting the corresponding transmission of information;
"standard device" means a device which complies with this standard;
"standard modulating signal" means a modulating signal comprising two
non-harmonically related sinusoids, in the frequency range 300 to 3000 Hz
inclusive, at a level of modulation 20 dB below that required to establish
rated peak envelope power;
"transmitter" means a radiocommunications transmitter;
"unwanted emission" means a spurious emission or an out-of-band emission;
"W" means Watts; and
"degrees C" means degrees Celsius.
1988 No. 70 STANDARD UNDER THE RADIOCOMMUNICATIONS ACT 1983 - PART 2
PART 2-GENERAL
1988 No. 70 STANDARD UNDER THE RADIOCOMMUNICATIONS ACT 1983 - REG 4
Devices to which this standard applies
4. (1) Subject to sub-clause 4 (2) this standard applies to:
(a) CB radios operating on frequencies not exceeding 30 MHz; and
(b) multi-role devices.
(2) Parts 3 and 4 of this standard do not apply to a multi-role device in
respect of its operation in services other than the Citizen Band Radio
Service.
1988 No. 70 STANDARD UNDER THE RADIOCOMMUNICATIONS ACT 1983 - REG 5
Equipment markings
5. (1) Subject to sub-clause 5 (3), there shall be displayed on a device-
(a) a compliance statement in the form set out in item 1 of the
schedule-
(i) indicating that the device complies with this standard; and
(ii) citing the type approval number shown on the compliance statement
certificate issued in respect of the device under Section 12 of the
Radiocommunications Act 1983; and
(b) its type or model designation which shall be distinctively different
from that of imported equipment requiring modification before it complies with
this standard.
(2) A statement or marking displayed on a device in accordance with
sub-clause 5 (1) shall be clearly visible on the exterior surface of the
device, indelible, tamper proof and affixed in such a manner as not to be
removeable except by destruction or defacing.
(3) Paragraph 5 (1) (a) does not apply to a device unless the importer,
manufacturer or supplier of the device, as the case may be, has been issued
with a compliance statement certificate in respect of the device.
1988 No. 70 STANDARD UNDER THE RADIOCOMMUNICATIONS ACT 1983 - REG 6
Adjustment mechanisms
6. (1) For the purpose of this clause an 'adjustment mechanism' is a
mechanism which enables the operation of a standard device to be altered so
that the device contravenes the requirement of this standard.
(2) Any adjustment mechanism shall be contained within the housing of a
device and shall be accessible only with the use of tools such as screwdrivers
and spanners.
1988 No. 70 STANDARD UNDER THE RADIOCOMMUNICATIONS ACT 1983 - REG 7
Conditions of operation
7. (1) The requirements of Parts 3 and 4 shall be met by a device when it
operates at:
(a) ambient temperatures of between 0 degrees C and 55 degrees C inclusive;
and
(b) primary supply voltages within +-10% of that declared by the
manufacturer.
1988 No. 70 STANDARD UNDER THE RADIOCOMMUNICATIONS ACT 1983 - PART 3
PART 3-TRANSMITTER
1988 No. 70 STANDARD UNDER THE RADIOCOMMUNICATIONS ACT 1983 - REG 8
Application
8. In this part 'transmitter' means a device which is a radiocommunications
transmitter operating on frequencies not exceeding 30 MHz.
1988 No. 70 STANDARD UNDER THE RADIOCOMMUNICATIONS ACT 1983 - REG 9
Emission modes
9. (1) Subject to subclause 9 (2), a transmitter shall be capable of
operation only in the A3E or J3E emission modes.
(2) Where the type of information to be transmitted is other than speech
telephony the duration of any such transmission shall not exceed 3 seconds in
any 60 second interval.
1988 No. 70 STANDARD UNDER THE RADIOCOMMUNICATIONS ACT 1983 - REG 10
Nominal carrier frequency
10. A transmitter shall, subject to clause 11, be capable of operating only
on a channel designated in the first, third or fifth column of the table set
out in item 2 of the schedule, being a channel whose nominal carrier frequency
is specified opposite that channel.
1988 No. 70 STANDARD UNDER THE RADIOCOMMUNICATIONS ACT 1983 - REG 11
Frequency error
11. The carrier frequency error of a transmitter shall not exceed +-1.4 kHz.
1988 No. 70 STANDARD UNDER THE RADIOCOMMUNICATIONS ACT 1983 - REG 12
Transients
12. Emissions from a transmitter shall be inhibited until the operating
carrier frequency has stabilized within the limit specified in clause 11.
1988 No. 70 STANDARD UNDER THE RADIOCOMMUNICATIONS ACT 1983 - REG 13
Carrier power
13. The output carrier power of a transmitter operating in the A3E emission
mode shall not exceed 4 W.
1988 No. 70 STANDARD UNDER THE RADIOCOMMUNICATIONS ACT 1983 - REG 14
Rated peak envelope power
14. The rated peak envelope power of a transmitter operating in the J3E
emission mode shall not exceed 12 W.
1988 No. 70 STANDARD UNDER THE RADIOCOMMUNICATIONS ACT 1983 - REG 15
Modulation limiting
15. Where a transmitter operates in the A3E emission mode the depth of
amplitude modulation under any modulation conditions shall not exceed 100%.
1988 No. 70 STANDARD UNDER THE RADIOCOMMUNICATIONS ACT 1983 - REG 16
Automatic level control
16. Where a transmitter operates in the J3E emission mode a step increase of
20 dB in the level of standard modulating signal shall not cause-
(1) any transient pX to exceed 12 W by more than 1 dB;
(2) where the transient pX exceeds 12 W, the time taken for the output
power to reduce within 0.5 dB of the steady-state pX to exceed 10
milliseconds.
1988 No. 70 STANDARD UNDER THE RADIOCOMMUNICATIONS ACT 1983 - REG 17
Out-of-band emission suppression
17. Where a transmitter operates in the A3E emission mode the power of each
out-of-band emission shall not exceed:
(a) 11 dBm, where the frequency of the emission differs from the operating
carrier frequency by greater than 4 kHz but not greater than 8 kHz;
(b) 1 dBm, where the frequency of the emission differs from the operating
carrier frequency by greater than 8 kHz but not greater than 20 kHz;
(c) -24 dBm, where the frequency of the emission differs from the operating
carrier frequency by greater than 20 kHz.
1988 No. 70 STANDARD UNDER THE RADIOCOMMUNICATIONS ACT 1983 - REG 18
Spurious emissions
18. The power of each spurious emission from a transmitter operating in the
A3E emission mode shall not exceed -26 dBm.
1988 No. 70 STANDARD UNDER THE RADIOCOMMUNICATIONS ACT 1983 - REG 19
Unwanted emission suppression
19. Where a transmitter operates in the J3E emission mode the power of each
out-of-band emission shall be attenuated relative to the reference sideband
power of the transmitter by at least:
(a) 24 dB, where the frequency of the emission differs from the centre
frequency of the permitted bandwidth by greater than 2 kHz but not greater
than 6 kHz;
(b) 34 dB, where the frequency of the emission differs from the centre
frequency of the permitted bandwidth by greater than 6 kHz but not greater
than 10 kHz;
(c) 59 dB, where the frequency of the emission differs from the centre
frequency of the permitted bandwidth by greater than 10 kHz.
1988 No. 70 STANDARD UNDER THE RADIOCOMMUNICATIONS ACT 1983 - PART 4
PART 4-RECEIVER
1988 No. 70 STANDARD UNDER THE RADIOCOMMUNICATIONS ACT 1983 - REG 20
Conducted spurious signals
20. The power of each spurious signal from a device which is a receiver
shall not exceed -57 dBm.
1988 No. 70 STANDARD UNDER THE RADIOCOMMUNICATIONS ACT 1983 - SCHEDULE
SCH
SCHEDULE
Item 1: THE FORM OF A COMPLIANCE STATEMENT (Clause 5)
"COMPLIES WITH MS312
TYPE APPROVAL NO . . . . . ."
Item 2: NOMINAL CARRIER FREQUENCY (Clause 10)
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-- Channel Carrier
Frequency
(MHz) Channel Carrier
Frequency
(MHz) Channel
Carrier Frequency (MHz)
------------------------------------------------------------------------------
-- 1 26.965 15 27.135 29
27.295 2 26.975 16 27.155 30
27.305 3 26.985 17 27.165 31
27.315 4 27.005 18 27.175 32
27.325 5 27.015 19 27.185 33
27.335 6 27.025 20 27.205 34
27.345 7 27.035 21 27.215 35
27.355 8 27.055 22 27.225 36
27.365 9 27.065 23 27.255 37
27.375 10 27.075 24 27.235 38
27.385 11 27.085 25 27.245 39
27.395 12 27.105 26 27.265 40
27.405 13 27.115 27 27.275
14 27.125 28 27.285
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