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GY/T 196-2003: Technical specifications for coverage networks of FM sound broadcasting
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Technical specifications for coverage networks of FM sound broadcasting
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GY/T 196-2003
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Basic data | Standard ID | GY/T 196-2003 (GY/T196-2003) | | Description (Translated English) | Technical specifications for coverage networks of FM sound broadcasting | | Sector / Industry | Radio, Film & TV Industry Standard (Recommended) | | Classification of Chinese Standard | M62 | | Classification of International Standard | 33.160 | | Word Count Estimation | 15,111 | | Date of Issue | 2003-10-29 | | Date of Implementation | 2003-12-01 | | Summary | This standard specifies the ground VHF (VHF) FM radio overlay network segment the main technical requirements, service areas and FM radio transmitter interference between transmitters state estimation methods. This standard does not include FM simulcast coverage networks involving relevant technical regulations. This standard applies to the preparation of FM radio overlay network planning and conducting FM radio frequency assignment and management. | GY/T 196-2003: Technical specifications for coverage networks of FM sound broadcasting---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Technical specifications for coverage networks of FM sound broadcasting
GY
Central Republic Radio, Film and Television
Technical Regulations for FM Broadcast Coverage Network
Shi 2.2003-12-01 Real 003-10-29
Chinese State Administration of Radio, Film and Television Publishes Industry Standards
Foreword
This standard is based on the original.1991 administrative document "Planning Methods for FM Broadcasting Coverage Network" of the Science and Technology Department of the Ministry of Radio, Film, and Television, and China's current legislation.
The stereo FM broadcasting plan is based on the recommendations of ITU-R P.370-7 and ITU-R BS.412-9. If necessary, you can also consider participating
Plan adjustments according to relevant ITU Recommendations.
This standard is under the jurisdiction of the National Radio and Television Standardization Technical Committee.
Drafting organizations of this standard. Institute of Standardization Planning of the State Administration of Radio, Film and Television, Administration of Radio Stations of the State Administration of Radio, Film, and Television
Bureau, State Radio, Film and Television Administration Monitoring Center.
The main drafters of this standard. Shi Hongxiang, Zhang Zhaoxiong, Cheng Ruiting, Zhang Jiandong, Zhu Yunyi, Peng Zean, Ding Wenping.
Technical Regulations for FM Broadcast Coverage Network
1 Scope
This standard specifies the main technical requirements for FM broadcasting coverage networks on the ground meter wave (VHF) segment, the service area and transmission of FM broadcasting transmitters.
Method for estimating the interference between machines. This standard does not include the relevant technical regulations related to FM synchronous broadcast coverage networks.
This standard is applicable to the preparation of FM broadcasting coverage network planning and the assignment and management of FM broadcasting frequencies.
2 Normative references
The clauses in the following documents have become the clauses of this standard after being referenced. For dated references, all subsequent
Neither amendments (excluding errata) or revised versions are applicable to this standard, however, parties who have reached an agreement under this standard are encouraged to study
Is the latest version of these files available? For undated references, the latest version applies to this standard.
GB/T 4311-2000 meter wave FM broadcasting technical specifications
GB 6364-1986 electromagnetic environment requirements for aeronautical radio navigation stations
GB/T 7400.1 General part of radio and television terminology
GB/T 7400.2 Radio and television terminology radio broadcasting
GB/T 14433-1993 Technical Regulations for Color TV Broadcast Coverage Network
GJB 2081-1994 Compatibility between broadcast services in the 87MHz ～ 108MHz frequency band and aviation services in the 108MHz ～ 137MHz frequency band
GJBz.20093-1992 VHF/UHF aeronautical radio communication station electromagnetic environment requirements
ITU-R BS.412-9 Planning standards for terrestrial FM sound broadcasting in the VHF band
ITU-R BS.704 planning reference receiver characteristics for stereo FM sound broadcasting
ITU-R IS.1009 The sound broadcasting service in the frequency band of about 87MHz to 108MHz is the same as the aviation service in the frequency band of 108MHz to 137MHz.
Compatibility
ITU-R P.370-7 VHF/UHF radio wave propagation curve in the range of 30MHz to 1000MHz
3 terms and definitions
The following terms and definitions apply to this standard.
3.1
Service field strength
E (50, 50)
The radio wave field strength for direct public reception refers to the radio wave field when the probability of the transmitter to be received is 50% at the location and time.
Strong.
3.2
Normalized service field strength
E1 (50, 50)
Service field strength when effective radiated power is 1kW.
3.3
Interfering field strength
Ei (50, T)
The field strength of a non-receiving transmitter that interferes with the desired transmitter.
For stable interference, the time probability T is 50%; for tropospheric interference, T is 10%.
3.4
Normalized interfering field strength
Ei1 (50, T)
The interference field strength when the effective radiated power is 1kW.
Stable interference, T equals 50%; tropospheric interference, T equals 10%.
3.5
Minimum usable field strength
Emin
In the case of natural and artificial noise without interference from other transmitters, the field strength necessary to satisfy the reception under specified conditions
The minimum value.
3.6
Usable field strength
Eu
When there is natural noise, artificial noise, and interference in the actual situation (such as co-channel adjacent frequency interference caused by the frequency planning results),
Minimum field strength required to satisfy reception under specified conditions.
3.7
Nominal usable field strength
Enom
In the case of natural noise, artificial noise and other transmitter interference, the quotient of the field strength necessary for satisfactory reception under specified conditions
Fixed minimum.
3.8
Harmful field
The sum of the interference field strength of the non-receiving transmitter and the dB value of the protection rate required by the receiving transmitter to resist the interference.
3.9
Field strength for rebroadcasting
The service field strength at which the transmitting source reaches the receiving antenna of the relay station.
3.10
Effective height of the transmitting antenna
h1
The difference between the average altitude of the center of the transmitting antenna element and the average altitude between the distance of 3km to 15km from the antenna along the receiving direction. It is equal to
The sum of the height of the transmitting antenna (ha) and the relative height of the transmitting antenna site (hr).
3.10.1
Height of transmitting antenna
ha
The center of the transmitting antenna is higher than the ground level.
3.10.2
Relative height of transmitting antenna field
hr
The difference between the altitude of the location where the transmitting antenna is located and the average altitude between the distance of 3km to 15km from the antenna along the receiving direction.
3.11
Degree of terrain irregularity
Δh
Draw a horizontal line cluster on the topographic profile within the range of 10km to 50km from the transmitting point along the receiving direction, and first find out the length of the section cut off from the profile.
The sum is a 4km horizontal line, and then the horizontal line whose cross-section length is 36km is found, and the height difference between the two horizontal lines.
3.12
Effective radiated power
Pe
The sum of the power fed to an antenna (taking into account feeder loss) and the dB value of the gain of the antenna in the receiving direction. The expression is shown in equation (1).
Pe = PG – L ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯ (1)
In the formula.
P--the nominal power of the transmitter, that is, the rated output power of the transmitter when it is calibrated at the factory;
G--the power gain of the transmitting antenna relative to the half-wave oscillator in the transmitting direction;
L--Feeder loss.
3.13
RF protection ratio
Under specified conditions, in order to achieve the required reception quality, the required signal field strength and interference signal field strength at the receiver input
The minimum difference between dB values.
For other terms and definitions, see GB 7400.1 and GB 7400.2.
Note 1. In this standard, the unit of height is m and the unit of distance is km.
Note 2. The field strength E is expressed in dB relative to 1μV/m, that is, E (dBμV/m) is equal to 20lgE (μV/m); the power P is expressed in dB relative to 1kW,
That is, P (dBkW) is equal to 10lgP (kW). When it comes to field strength, it generally means that the height of the receiving antenna (h2) is 10m, which is no longer specified one by one.
4 Main technical requirements
4.1 FM broadcasting band
87.0MHz to 108.0MHz.
4.2 Channel settings
Channel interval. 100kHz. Nominal carrier frequency is an integer multiple of 100kHz;
Channel width..200kHz;
Maximum frequency deviation. ± 75kHz;
Receiver IF. 10.7MHz.
The FM stereo broadcast uses a pilot system.
4.3 Minimum Available Field Strength
Table 1 of ITU-R BS.412-9 is used. The minimum available field strengths for rural and urban areas (referred to as prefecture-level cities and above) are
54dBμV/m and 66dBμV/m.
4.4 Nominal available field strength
Use the lowest available field strength value.
4.5 Turn-over field strength
The service field strength from the source transmitter for the program to the receiving antenna of the relay station is not less than 40dB.
4.6 Propagation curve
Field strength curve using Recommendation ITU-R P.370-7. See Figure 1, Figure 2.
This standard does not consider the interference field strength of the mixed land-water path. If necessary, the warm sea curve of Recommendation ITU-R P.370-7 may be used, and
The field strength calculation method of land-sea mixed path listed in 5.2.3 of GB/T 14433-1993 is used.
10 20 50 1 000 100.200 400 600 800
h = 150 m1
h = 75 m1
h = 1.200 m1
h = 600 m1
h = 300 m1
h = 37.5 m 1
h1 = 1200m
h1 = 600m
h1 = 300m
2020 g
(µ
))
h1 = 150m
h1 = 75m
h1 = 37.5m 1010
– 10-10
µv
– 20-20
– 30-30
– 40 -40
– 50-50
400 600 800 1000
10 20 50 100.200
Log scale linear scale
Distance (km)
Pe is 1kW;
h2 is 10m;
Δh is 50m;
The uppermost dashed line is the attenuation curve of the radio wave field strength in free space;
The frequency is 30 MHz to 250 MHz (band I, band II and III);
land;
50% time probability;
50% location probability.
Figure 1 Field strength curve (A) when the effective radiated power is 1kW
h = 150 m1
h = 75 m1
10 20 50 1 000 100.200 400 600 800
h = 1.200 m1
h = 600 m1
h = 300 m1
h = 37.5 m 1
(µ
))
h1 = 1200m
h1 = 600m
h1 = 300m
h1 = 150m
h1 = 75m
h1 = 5
µv
– 10-10
– 20-20
– 30-30
– 40 -40
– 50-50
400 600 800 1000 10 20 50 100.200
Log scale linear scale
Distance (km)
Pe is 1kW;
h2 is 10m;
Δh is 50m;
The uppermost dotted line is the curve of the attenuation of the radio wave field strength in free space;
The frequency is 30 MHz to 250 MHz (band I, band II and III);
land;
10% time probability;
50% location probability.
Figure 2 Field strength curve when the effective radiated power is 1kW (B)
4.7 Terrain ruggedness (Δh) and attenuation correction factor F (Δh)
The curve using Recommendation ITU-R P.370-7 is shown in Figure 3.
Distance d (km)
The frequency is 80MHz ~ 250MHz (band II and III).
Figure 3 Curve of attenuation correction coefficient F (Δh) as a function of distance d and Δh
For the convenience of calculation, the attenuation correction coefficient values at d = 50km ～ 100km and d≥200km in Figure 3 are listed, as shown in Table 1.
Table 1 Table of terrain ruggedness and attenuation correction coefficient corresponding to Figure 3
Δh
F1
dB
F2
dB
10 -7.0 -3.4
20 -4.4 -2.4
30 -2.6 -1.5
40 -1.3 -0.7
60 0.7 0.6
70 1.9 1.1
80 2.6 1.5
90 3.5 2.0
100 4.3 2.4
150 7.6 3.9
200 10.0 5.2
300 13.9 7.0
400 16.9 8.2
500 18.9 9.1
a F1 is a value when d = 50km to 100km.
b F2 is the value when d≥200km.
F (
h)
4.8 RF protection ratio
The curve using Recommendation ITU-R BS.412-9 is shown in Figure 4.
According to the curve in Figure 4, the RF protection ratios for a given FM broadcast carrier frequency interval are listed in Table 2.
When the carrier frequency difference is greater than 400kHz, the value of the RF protection ratio should be lower than -20dB.
For a specific carrier frequency difference (intermediate frequency) of 10.7MHz, the value of the RF protection ratio should be lower than -20dB.
When quoting the above-mentioned RF protection ratio, the technical conditions of FM broadcasting should meet GB/T 4311-2000.
M1
M2
S1S1
S2
M1
M22020
10-10
20-20
00 100 100.200.200 300 300 400 400
The difference between the desired carrier frequency and the interference carrier frequency (kHz)
M1--Mono broadcast stable interference;
M2 mono broadcast, tropospheric interference (protection rate 99% of the time);
S1--wide stereo, stable interference;
S2--wide stereo, tropospheric interference (protection rate 99% of the time).
Figure--4 maximum frequency
Broadcasting, deviation ± 75kHz, frequency between 87MHz and 108MHz, radio frequency protection ratio curve required for broadcasting
Table 2 Comparison table of FM broadcast carrier frequency interval and RF protection ratio
RF protection ratio
dB
Carrier frequency interval
kHz
Tropospheric interference
300 -7 -7
400 -20 -20
4.9 Orthogonal polarization discrimination rate
Transmitting antennas generally use horizontal polarization. In special cases, other polarization methods can be used. The orthogonal polarization discrimination rate is 10dB.
4.10 Field Strength
4.10.1 Service field strength or interference field strength
The service field strength or interference field strength is calculated according to formula (2).
E = Pe E1 (50, T)-F (Δh) ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯ (2)
In the formula.
E--service field strength or interference field strength;
Pe--effective radiated power;
E1 (50, T)-normalized service field strength or normalized interference field strength;
F (Δh)-attenuation correction factor when taking into account the rugged terrain.
4.10.1.1 When calculating the normalized service field strength or stable interference field strength E1 (50, T), check Figure 1 (T = 50); calculate the tropospheric interference field
Strong time check Figure 2 (T = 10). When calculating by computer, take the values according to Table 3 and Table 4, respectively.
When the distance d < 10km, take the value in Table 5.
When the effective height of the transmitting antenna h1 < 10m, take the value when h1 = 10m;
When the effective height of the transmitting antenna h1 > 1200m.
hdc 4.170 = (km) ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯ (3)
When the distance d≥dc, find the field strength according to formula (4).
4.170 (300,), (
hdEdhE − = ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯ (4)
When the distance d < dc, find the field strength according to formula (5).
−−
) (1200,
)] (1200, (300,140) [
) (1200,
) (1200, (300,140)) (1200,
), (
dE
dcEE
dE
dcEEdE
dhE
20 < ⋯⋯ (5) < 100 (km)
100≤d ＜ dc （km）
d≤20 (km)
In the formula.
E (h1, d) is the field strength at the transmitting antenna effective height h1 (m) and distance d (km).
4.10.1.2 F (Δh)-The terrain ruggedness Δh attenuation correction coefficient. Changes with distance and Δh can be found out in Figure 3. Computer calculation
When using, take the value according to Table 1.
When Δh < 10m, take the value when Δh = 10m; when Δh> 500m, take the value when Δh = 500m.
4.10.2 Harmful Field
The calculation of the harmful field of a single interference source is according to formula (6).
E = Ei (50, T) A ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯ (6)
In the formula.
E--harmful field;
Ei (50, T)-The interference field strength formed by the interference transmitter. The stable interference field strength Eis (T = 50) and convection were calculated during the calculation.
Layer interference field strength Eit (T = 10);
A--The protection rate required by the transmitter to resist the interference. In the calculation, the protection ratio As of stable interference and the
Protection rate At.
Compare Eis As and Eit At, and take the bigger one as the harmful field.
4.10.3 Available field strength
When there are multiple interferences, the available field strength can be obtained by "simplified product method". The calculation point is the location of the transmitter to be received. For the calculation method, see
GB/T 14433-1993 5.2.5.
Table 3 1kW effective radiated power field strength a in dBμV/m
h1
km
10 20 37.5 75 150 300 600 1200
10 52.80 58.80 63.80 70.70 77.80 84.50 87.00 87.00
15 45.10 51.10 56.10 62.20 69.10 76.10 81.60 83.40
20 39.20 45.20 50.20 56.20 63.20 70.80 77.30 80.90
25 34.50 40.50 45.50 51.20 58.30 66.20 73.10 78.30
30 30.80 36.70 41.60 47.10 54.30 62.20 69.50 76.20
35 27.60 33.30 38.10 43.90 51.20 59.00 66.30 74.00
40 24.70 30.30 35.00 40.80 48.20 55.80 63.40 71.90
45 22.30 27.70 32.30 38.40 45.10 52.70 60.60 70.00
50 20.20 25.60 30.00 36.00 43.10 50.20 58.30 67.90
60 16.70 21.80 26.00 31.40 37.70 45.00 53.70 63.80
70 13.80 18.60 22.60 27.70 33.70 40.80 49.40 59.80
80 11.70 16.20 20.00 24.20 30.00 36.30 45.00 55.70
90 9.80 14.00 17.60 21.50 26.70 32.70 41.30 51.90
100 7.70 11.70 15.00 18.70 23.40 28.80 37.20 48.00
150 2.10 4.80 7.00 9.20 11.70 15.20 22.00 31.70
200 -1.40 -0.10 1.00 2.10 3.70 6.60 11.30 19.40
250 -4.50 -4.50 -4.50 -3.40 -1.60 0.70 4.60 10.60
300 -9.40 -9.40 -9.40 -8.20 -6.90 -4.90 -1.30 3.00
350 -14.10 -14.10 -14.10 -13.20 -11.50 -9.60 -6.90 -2.60
400 -18.10 -18.10 -18.10 -17.40 -16.10 -14.00 -11.50 -7.50
500 -26.50 -26.50 -26.50 -25.70 -24.30 -22.50 -19.90 -16.50
600 -34.60 -34.60 -34.60 -33.80 -32.30 -30.70 -28.20 -24.70
700 -42.90 -42.90 -42.90 -42.10 -40.70 -39.10 -36.40 -33.20
800 -51.10 -51.10 -51.10 -50.30 -48.80 -47.20 -44.60 -41.30
900 -59.30 -59.30 -59.30 -58.40 -56.90 -55.30 -52.70 -49.40
1000 -68.00 -68.00 -68.00 -66.80 -65.20 -63.50 -61.10 -58.00
a Time probability is 50%, h2 = 10m, Δh = 50m.
Table 4 1kW effective radiated power field strength a in dBμV/m
h1
km
10 20 37.5 75 150 300 600 1200
10 52.8 58.8 63.8 71.0 78.0 84.5 87.0 87.0
15 45.4 51.4 56.4 62.6 69.7 77.1 82.3 83.4
20 39.7 45.7 50.7 57.0 63.6 71.2 78.3 80.9
25 35.6 41.6 46.6 52.2 58.6 66.6 74.0 78.5
30 32.1 38.0 42.9 48.1 54.8 62.6 70.1 76.3
35 29.3 35.0 39.8 45.0 51.4 59.2 66.8 74.2
40 26.9 32.5 37.2 42.5 48.2 56.2 63.5 72.1
45 25.0 30.4 35.0 40.0 45.9 53.8 60.6 70.0
50 23.6 29.0 33.4 38.3 43.6 51.2 58.3 67.9
60 21.9 27.0 31.2 35.3 40.0 47.1 53.7 63.8
70 20.4 25.2 29.2 32.8 37.1 43.3 49.7 60.0
80 19.2 23.7 27.5 30.5 34.4 40.0 46.2 56.2
90 18.2 22.4 26.0 28.4 32.5 37.4 43.3 53.1
100 17.1 21.1 24.4 26.7 30.6 34.8 40.1 49.5
150 12.9 15.6 17.8 19.7 21.8 25.3 29.6 36.5
200 9.1 10.4 11.5 13.0 14.8 17.7 21.4 27.3
250 5.7 5.7 5.7 7.5 8.8 11.3 14.9 20.3
300 0.3 0.3 0.3 1.7 3.1 5.0 8.5 13.5
350 -4.8 -4.8 -4.8 -3.6 -2.4 -0.4 3.1 7.7
400 -9.8 -9.8 -9.8 -8.7 -7.5 -5.6 -2.2 2.1
500 -18.7 -18.7 -18.7 -17.8 -16.6 -14.9 -12.0 -7.8
600 -27.7 -27.7 -27.7 -26.4 -25.3 -23.5 -20.7 -17.1
700 -36.4 -36.4 -36.4 -35.3 -34.0 -32.3 -29.5 -25.8
800 -45.1 -45.1 -45.1 -43.9 -42.8 -41.1 -38.2 -34.6
900 -53.8 -53.8 -53.8 -52.7 -51.8 -50.0 -47.1 -43.5
1000 -61.9 -61.9 -61.9 -61.0 -60.6 -58.7 -55.8 -52.3
a Time probability is 10%, h2 = 10m, Δh = 50m.
Table 5 1kW effective radiated power (distance less than 10km) field strength unit is dBμV/m
h1
km
10 20 37.5 75 150 300 600 1200
1 96.5 102.5 107 107 107 107 107 107
2 83.4 89.5 94.4 101 101 101 101 101
3 75.7 81.7 86.7 96 97.5 97.5 97.5 97.5
4 70.2 76.2 81.2 89.9 95 95 95 95
5 66 72 77 85.2 92.7 93 93 93
6 62.5 68.5 73.5 81.4 88.8 91.4 91.4 91.4
7 59.6 65.6 70.6 78.1 85.5 90 90 90
8 57 63 68 75.4 82.6 89 89 89
9 54.8 60.8 65.8 72.9 80 86.7 87.9 87.9
5 Frequency constraints
5.1 Restrictions on frequency requirements
5.1.1 The frequency interval of FM broadcasting on the same station is generally not less than 1MHz (when the frequency of the same station is 6 or more, the frequency interval is not less than
800kHz) or 10.7MHz ± 0.2MHz.
5.1.2 When the FM broadcast is on the same channel as the terrestrial TV channel 4 transmitter with a nominal power greater than 50W (excluding), the guard band should be given up.
The assigned FM broadcast frequency starts at 87.2MHz.
5.1.3 When the FM broadcast is on the same channel as the terrestrial TV channel 4 transmitter with a nominal power greater than 50W (not included), the FM broadcast frequency and ground
The frequency interval of the three carrier frequencies of the 4th channel of the face-to-face TV should not be 10.7MHz ± 0.2MHz, and 87.7MHz ～ 88.2 MHz, 92.1 MHz ～
92.6 MHz, 94.2MHz ~ 94.7MHz.
5.1.4 The coverage area above 100dB (inclusive) of one FM broadcast frequency overlaps with the coverage area above 56dB (inclusive) of another desired frequency,
The interval between the two frequencies should not be less than 800kHz.
5.1.5 The coverage area above 80dB (inclusive) of one FM broadcast frequency overlaps with the coverage area above 56dB (inclusive) of another desired frequency.
The interval between the two frequencies should not be 10.7MHz ± 0.2MHz.
5.1.6 When preparing the plan, within the range of 65km around the air navigation station, when the FM broadcasting transmitting station has a nominal power greater than 1kW (inclusive)
When transmitting, the third-order intermodulation frequency between the FM broadcasting frequencies of the station should not fall on the navigation frequency of the navigation station. When the navigation station has multiple
At frequency, at least 2 to 3 should be protected. Within 45km of the air navigation station, the transmitter power levels are 300W and 100W.
Third-order intermodulation frequency between FM broadcasting frequencies of a radio broadcasting station should not fall on the navigation station's navigation frequency, when the navigation station has multiple frequencies
At least two to three should be protected.
When revising the plan, you should consult with relevant business authorities that may be affected, and refer to the use of GB 6364-1986, GJB 2081-1994
And GJBz.20093-1992 and other standards, calculate or measure intermodulation (two signals/three signals) at the same site to reach the air navigation station, air communication station
Protect the signal field strength of the airspace with frequency points. If the standard is met or the measured site does not have the intermodulation component at the same site, the planned frequency can be modified.
When it is really difficult to meet the above criteria, it can be solved through calculation, measurement or other technical measures.
5.2 Frequency restrictions
5.2.1 The coverage area above 100dB (inclusive) of the FM broadcasting frequency is a populated area, and (1) this frequency is the same as the 6th to 12th frequency of terrestrial television
Any channel in the channel is on the same channel, and the effective radiated power of the FM broadcast is more than 10dB (inclusive) greater than the terrestrial television; or (2) 100dB of the frequency
(Inclusive) The coverage area above overlaps with the coverage area above 70dB (inclusive) of any of the channels 6 ~ 12 of the terrestrial television, and the frequency modulation of the same channel is wide.
The second harmonic of the broadcast frequency should avoid the terrestrial television image carrier frequency and color subcarrier frequency ± 1MHz, and the sound carrier frequency ± 0.2MHz.
5.2.2 Under the conditions of 5.2.1, the second-order intermodulation frequency (f1 f2) between the FM broadcast frequencies of the same station should avoid the terrestrial television image carrier frequency and
The color sub-carrier frequency is ± 1MHz, and the sound carrier frequency is ± 0.2MHz.
5.2.3 The coverage area above 100dB (inclusive) of the FM broadcasting frequency is a populated area, and (1) this frequency is the same as that of terrestrial television
Or 3 channels on the same channel; or (2) the coverage area of 100dB or more of the frequency and 70dB (inclusive) of the terrestrial TV channels 1, 2 or 3
The upper coverage area overlaps, in order to avoid the FM broadcast frequency from interfering with the local TV local oscillator frequency. When the local TV is channel 1, 2 or 3, FM
Broadcasting should avoid 87.7MHz, 87.8 MHz or 95.7MHz, 95.8 MHz or 103.7MHz, 103.8MHz, respectively.
5.2.4 A and B have overlapping coverage areas. In the coverage area where the signal field of any frequency of A and B is stronger than 100dB (inclusive),
When the frequency signal field strength of the station is lower than 83dB (inclusive), the frequency should avoid the third-order intermodulation caused by the strong signal frequency of station A and other frequencies on the same station.
Frequency (including 2f1–f2 and f1 f2–f3).
5.2.5 During the difference, the interval between the frequency to be received and the transmission frequency and other transmission frequencies on the same station should not be less than 1.2MHz. Desired frequency and transmit frequency,
The frequency interval of other transmitting frequencies on the same station and the third carrier frequency of channel 4 of the terrestrial television should not be 10.7MHz ± 0.2MHz.
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