1. Phạm vi Định nghĩa và chữ viết tắt

Shall not exceed 3 dB.

Cordless telephone equipment having transmitter power of less than 1 W shall conform to following specific technical requirements beside general ones illustrated in Section 3.1.

Frequency tolerance limits at different frequency bands for equipments with different channel separation are given in table 3

Shall not exceed 1 W

Permissible tolerance under normal measurement conditions for:

+ Base unit: ± 1.5 dB

+ Mobile unit: ± 1.5 dB

3.2.3. Spurious Emission

Power of any spurious emission component of the transmitter shall not exceed the values given in table 4.

Working mode	Spurious emission criterion
Standby mode	2.0(-57.0 dBm)
Operation mode	0.25(-36.0 dBm)

The maximum sensitivity shall not exceed the values given in table 5. Table 5: Maximum sensitivity of receiver

(Apply to both integral antenna equipments and external antenna ones)

Cordless telephone equipment having transmitter power of 1 W to 25 W shall conform to following specific technical requirements beside general ones illustrated in Section 3.1.

3.3.1. Frequency Tolerance

Frequency Tolerance limits for equipments at different frequency bands are given in Table 6.

Allowed tolerance under normal test conditions:

+ Base Unit: ±2.0 dB

+ Mobile Unit: ±3.0 dB

Power of any spurious emission component shall not exceed 2.5

Maximum sensitivity of receiver for base unit and mobile unit shall not exceed 6

Scheme of measurement is shown in Figure 2.

a) The equipment shall be placed in the test fixture connected to the artificial antenna.

b) The carrier frequency shall be measured in the absence of modulation. The measurement shall be made under normal test conditions.

c) The result on the frequency meter shall be recorded.

Scheme of measurement is shown in Figure 3.

a) The transmitter under test shall be connected via a 50 variable attenuator to the frequency meter;

b) The carrier frequency shall be measured in the absence of modulation under normal test conditions;

c) The reading of the frequency meter shall be recorded.

(Applied only for equipment with chargeable battery)

Scheme of measurement is shown in Figure 4.



Figure 4: Arrangement for measurement of frequency stability

a) The carrier frequency shall be measured in the absence of modulation

b) Equipment under test shall be placed in the test fixture connected to artificial antenna (in the case of transmitter having 50 antenna socket, equipment under test shall be directly connected to artificial antenna without the use of the test fixture).

c) Under normal test conditions, the adjustment of the test power supply shall be performed so that the lower limit voltage is obtained.

d) During the adjustment, the reading of the meter and the maximum frequency deviation shall be recorded.

e) Measurement results shall be processed using statistical method.

Radiated measurement method for integral antenna equipment.

Scheme of measurement is shown in Figure 5.



Figure 5: Arrangement for radiated measurement of carrier power

a) Transmitter under test shall be placed on a support that can be freely rotated through 360° about a vertical axis at the altitude of 1.5 m from the ground plane and 10 m away from the test antenna. The transmitter shall be switched on and measured in the absence of modulation;

b) The spectrum analyzer shall be tuned to the transmitter carrier frequency;

c) The test antenna shall be raised or lowered through the range of 1 m to 4 m until the maximum signal level is detected on the spectrum analyzer;

d) The transmitter shall be rotated through 360° about a vertical axis until the maximum signal is received. The value of received signal shall be recorded;

e) Using measurement arrangement of figure 5, the substitution antenna shall replace the transmitter. The substitution antenna shall be connected to the signal generator;

f) The frequency of the signal generator shall be adjusted to the transmitter carrier frequency;

g) The input signal to the substitution antenna shall be adjusted in level until a received signal level equals to that obtained in step d) is detected.

The value of the maximum effective radiated power of the equipment under test is equal to the power supplied by the signal generator.

4.2.2. Transmitter carrier power

Conducted measurement method for equipment having an external 50 antenna socket.

Scheme of measurement is shown in Figure 6.



Figure 6: Arrangement for measurement of transmitted power of transmitter having 50 antenna socket

a) The variable attenuator shall be set at the maximum level. The power sensor shall be calibrated;

b) Transmitter under test shall be switched on in the absence of modulation;

c) Attenuation shall be gradually decreased until the transmit power level is obtained on the power meter;

d) The value of transmitter carrier power is the sum of the value obtained on the power meter and the attenuation (including connector and cable losses)

4.3. Maximum frequency deviation

4.3.1. Integral antenna equipment

Scheme of measurement is shown in Figure 7.

a) Transmitter under test shall be placed in the test fixture connected to the artificial antenna;

b) The level of test signal shall be 20 dB above the level corresponding to a deviation at 1000 Hz of 12% of the channel separation;

c) On the signal generator, the modulating frequency shall be varied within the audio frequency band:

+ Between 300 Hz and 25 kHz for channel separation of 25 kHz

+ Between 300 Hz and 2550 Hz for channel separation of 10 and 12.5 kHz

d) This value shall be recorded.

4.3.2. Equipment with external antenna socket

Set up measurement arrangement as shown in figure 8.

a) Transmitter under test shall be connected via a power attenuation to the deviation meter;

b) The level of test signal shall be 20 dB above the level corresponding to a deviation at 1000 Hz of 12% of the channel separation;

c) The modulating frequency shall be changed within the audio frequency band:

+ Between 300 Hz and 25 kHz for channel separation of 25 kHz

+ Between 300 Hz and 2550 Hz for channel separation of 10 and 12.5 kHz

d) The maximum frequency deviation shall be recorded.

4.4. Maximum receiver sensitivity

4.4.1. Radiated measurement for equipment without external antenna socket

Scheme of measurement is shown in Figure 9.

1) SINAD meter

2) AF load/ Acoustic Coupler

3) Receiver under test

4) Test antenna

5) Signal generator

a) The signal generator shall be set at the nominal frequency of the receiver under test. The modulating signal shall be at 1000 Hz with the deviation of 60% of the maximum deviation of related channel separation;

b) The audio level of the receiver shall be adjusted to 50% of the nominal output audio power level;

c) The output level of the signal generator shall be adjusted until a SINAD ratio of 20 dB is obtained on the acoustic coupler;

d) The test antenna shall be raised or lowered in the range of 1 m to 4 m to find the lowest level of the test signal that produces a SINAD ratio of 20 dB;

e) The receiver under test shall be rotated through 360° about a vertical axis to find the lowest level of the test signal that produces a SINAD ratio of 20 dB;

f) Using measurement arrangement 9, the substitution antenna shall replace the receiver in the same position and be connected to the measuring receiver or the spectrum analyzer;

g) The test antenna shall be raised or lowered in the range of 1 m to 4 m to find the level of the test signal obtained in step e);

h) The maximum receiver sensitivity shall be the level of signal measured on the measuring receiver.

4.4.2. Receiver sensitivity (conducted measurement)

Applied for equipments with 50external antenna socket.

Scheme of measurement is shown in Figure 10.



Figure 10: Arrangement for measurement of receiver sensitivity (conducted measurement)

a) The signal generator shall be tuned at the nominal frequency of the receiver under test. The modulating signal shall be at 1000 Hz with the deviation of 60% of the maximum deviation of related channel separation;

b) The audio level of the receiver shall be adjusted to 50% of the nominal output audio power level;

c) The amplitude of the signal generator shall be adjusted until a SINAD ratio of 20 dB is obtained;

d) The test signal input level is the value of the receiver sensitivity.

Scheme of measurement is shown in Figure 11.

a) The signal generator shall be at the nominal frequency of the receiver;

b) The signal generator shall be adjusted to the desired signal level;

c) The audio output level shall be at 25% of the nominal audio power. This level shall be recorded;

d) The input signal shall be increased to an emf (electromotive force) of +100 dB/and the level of audio output shall be recorded;

e) The amplitude characteristics of the receiver is recorded as the change of level of the audio output measured in steps c) and d) above expressed in dB.

Scheme of measurement is shown in Figure 12.

a) The test antenna shall be connected via a high pass filter to a spectrum analyzer. The test antenna length shall be chosen equivalent to instantaneous frequency of the spectrum analyzer;

b) The transmitter shall be switched on in the absence of modulation. The spectrum analyzer shall be adjusted within the range of 30 MHz to 4 GHz. The radiation of any spurious component shall be detected, the frequency of each spurious component shall be recorded;

c) The test antenna shall be raised or lowered through the specified height range until a maximum is obtained;

d) The transmitter shall be rotated up to 360° about the vertical axis, until higher maximum signal is received. This level shall be recorded;

e) Using the measurement arrangement shown in figure 12, the substitution antenna shall replace the transmitter in the same position. It shall be connected to the signal generator;

f) For each frequency at which a component has been detected, the signal generator shall be tuned;

g) The test antenna shall be raised or lowered in the range of 1 m to 4 m until a maximum is obtained;

h) The amplitude of the signal generator shall be adjusted until the level measured on the spectrum analyzer is equal to the one obtained in step d);

i) This value after the correction due to the gain of the substitution antenna and the cable loss between the signal generator and the substitution antenna is the radiated spurious component at this frequency;

j) The measurement shall be repeated with the transmitter in stand-by condition.

4.6.2. Conducted measurement (apply only to equipment with external antenna socket)

Scheme of measurement is shown in Figure 13.

a) Transmitter under test shall be connected to a spectrum analyzer through a 50  power attenuator and a filter;

b) The transmitter shall be switched on in the absence of modulation. The frequency of the spectrum analyzer shall be adjusted in the range of 9 kHz to 4 GHz;

c) The frequency and level of every spurious emission component that has been found out shall be recorded as conducted emission level distributed on the power attenuator. The emissions within the channel occupied by the transmitter carrier and its adjacent channels shall not be recorded;

d) The measurement shall be repeated with the transmitter in stand-by condition.
ANNEX A

(Normative)

NORMAL TEST CONDITIONS

● Temperature: +15°C to +35°C

● Relative humidity: 20% to 75%

● AC voltage: 220 VAC/50Hz

● When use lead-acid battery power source, DC voltage shall be 1.1 times the nominal voltage of the battery.
ANNEX B

(Normative)

ABSOLUTE MEASUREMENT UNCERTAINTIES AND MEASUREMENT RESULT PROCESSING

B.1. Absolute measurement uncertainties: maximum values

Carrier frequency	< ±1 x 10-7
Carrier power	< ±0.75 dB
Maximum frequency error	< ±5%
Receiver sensitivity at SINAD of 20 dB	< ±3 dB
Receiver amplitude characteristic	< ±1.5 dB

B.2. Processing, explanation of radiated measurement results in comparison with criteria in the technical documentation shall be carried out as follow:

+ Measured results shall be compared with corresponding limits in order to determine whether the equipment meet requirements of this standard or not.

+ Measurement errors for each parameter shall be included in the measurement report.
ANNEX C

(Normative)

MEASUREMENT REQUIREMENTS AND METHOD GENERALIZATION

C.1. Cordless telephone equipment having transmitter power of less than 1 W

Table 7: Table of measurement requirements and methods

N°	Technical parameter	Technical criteria	Method of measurement
1	Transmitter carrier frequency	Compliant to Table 1	Section 4.1.1
2	Emission class	F3E; G3E
3	Channel separation	10; 12.5; and 25 kHz
4	Transmitter power	< 1W	Section 4.2.1
5	Transmitter power tolerance	± 1.5 dB	Section 4.2.1
6	Spurious emission power	Standby mode: ≤ 2.0 nW Active mode: ≤ 0.25	Section 4.6.1
7	Carrier stability	±20 x 10-6	Section 4.1.3
8	Maximum frequency deviation	Table 2	Section 4.3.1
9	Frequency tolerance	Table 3	Section 4.1.1
10	Maximum receiver sensitivity	Table 5	Section 4.4.1
11	Transmitter amplitude characteristic	≤3.0 dB	Section 4.5
12	Criteria of interface with PSTN	TCN 68- 188: 2000	TCN 68 – 188: 2000

C.2. Cordless telephone equipment having transmitter power of 1 W to 25 W

Table 8: Table of measurement requirements and methods

N°	Technical parameter	Technical criteria	Method of measurement
1	Transmitter carrier frequency	Compliant to Table 1	Section 4.1.2
2	Emission class	F3E; G3E
3	Channel separation	25 kHz
4	Transmitter power	1W ≤ P ≤ 25 W	Section 4.2.2
5	Transmitter power tolerance	Base unit: ± 2.0 dB Mobile unit: ± 3.0 dB	Section 4.2.2
6	Spurious emission power	≤ 2.5	Section 4.6.2
7	Carrier stability	±5x10-6 to ±10 x 10-6	Section 4.1.3
8	Maximum frequency deviation	Table 2	Section 4.3.2
9	Frequency tolerance	Table 6	Section 4.1.2
10	Maximum receiver sensitivity	≤ 6 at SINAD 20 dB	Section 4.4.1
11	Transmitter amplitude characteristic	≤ 3.0dB	Section 4.5
12	Criteria of interface with PSTN	TCN 68- 188: 2000	TCN 68 - 188: 2000

REFERENCES

[1] ITU-R Rep. 1025-1: “Technical and Operational Characteristics of Cordless Telephone and Cordless Telephones”

[2] ITU-R Rec. SM.329-7 (March 1999): "Spurious emission"

13] ITU-R M.478-5 (10/1995): "Technical characteristics of equipment and principles governing the allocation of frequency channel between 25 and 3000 MHz for the FM land mobile services"

[5] ETS 300 086 (January 1991): "Radio Equipment and System Land Mobile Service Technical characteristics and test conditions for radio equipment with an internal or external RF connector intended primarily for analog speech "

[6] ITU-R Rec. M.1033-1: "Technical and Operational Characteristics of Cordless Telephone and Cordless Telecommunication Systems"

[7] ETR 027 (September 1991): "Radio Equipment and Systems; Methods of Measurement for Mobile Radio Equipment"