This standard specifies the technical requirements for television transmission and reception equipment in satellite communication earth stations, except for antenna subsystems and terminal equipment subsystems. This standard applies to the establishment, technical transformation and manufacturing of satellite communication earth stations. GB/T 11444.3-1989 Technical requirements for transmission, reception and ground communication equipment of domestic satellite communication earth stations Part 3: TV/FM equipment GB/T11444.3-1989 Standard download decompression password: www.bzxz.net

National Standard of the People's Republic of ChinawwW.bzxz.Net
GB/T 11444.3—1989
Technical requirements for transmitting, receiving and ground communication equipment used in domestic satellite communication earth stations
Part 3: Equipment for television/frequency modulation
Transmitter, receiver and ground communicationequipment used in domestic satellite communicationearth stationsTechnical reguirements-Part 3:Equipment for television/frequency modulationPromulgated on July 4, 1989
Implemented on March 1, 1990
Promulgated by the State Administration of Technical Supervision
National Standard of the People's Republic of China
Technical requirements for transmitting, receiving and ground communication equipment used in domestic satellite communication earth stations
Part 3: Equipment for television/frequency modulation requirementsPatr3: Equipment for television/frequency modulation1 Subject content and scope of application
GB/T11444.3—1989
This standard specifies the technical requirements for television transmission and reception equipment in satellite communication earth stations, except for antenna subsystems and terminal equipment subsystems.
This standard applies to the establishment, technical transformation and technical basis of equipment manufacturing of satellite communication earth stations. 2 Reference standards
GB 11443.1
GB11443.4
3 Equipment composition
General technical requirements for domestic satellite communication earth stations Part 1 General requirements General technical requirements for domestic satellite communication earth stations Part 4 TV/FM carrier channel equipment consists of transmitting equipment, receiving equipment, TV channel equipment and other units. See Figure 1 for a typical block diagram. Each functional unit can be a single device or several functional units can form a device. The interface level between each unit is a recommended typical value. Each functional unit should generally have a main and a standby and be adaptable to automatic or manual switching. 1
High momentum
Amplifier
Designated
Receiver
Micro-device
Arranged
Group
Evidence
Micro-strip
Figure 1 Block diagram of transmitting, receiving and ground communication (TV channel) equipment State Technical Supervision Bureau 1989-07-04 Approved by the State | |tt||Semi-production
Companion guard solution
1990-03-01 implementation
4 Equipment working conditions
a. Temperature: 5~40℃;
b. Relative humidity: 5%~85%,
c. Air pressure: 70~106kPa,
GB/T11444.3—1989
d. Power supply: single-phase AC, voltage 220±22V, frequency 50±1Hz. Note: High power amplifier uses three-phase AC power supply, voltage 380±38V, frequency 50±1Hz. 5 Equipment input and output connectors
5.1 RF
Coaxial L16-50K
5.2 IF
Coaxial Q9-75K
5.3 Baseband
Coaxial Q9-75K
5.4 High power amplifier output
FDM-70 waveguide flange
5.5 Low noise amplifier input
FDM-40 waveguide flange
6 Transmitter
Includes high power amplifier and medium power amplifier. High power amplifier is usually a klystron amplifier or a traveling wave tube amplifier. 6.1 High power amplifier
6.1.1 Frequency range
5925~6425MHz (or extended to 5850~6650MHz)6.1.2 Saturated output power
Classification into three categories:
Nominal value
A. 3kW (34.8dBW)
B. 1 kW (30 dBW)
C.0.4kW(26dBW)
Note: Waveguide flange output.
6.1.3 Bandwidth
Minimum value
2.7kW(34.3dBW)
0.9kW(29.5dBW)
0.36kW(25.6dBW)
Klystron high power amplifier:>36MHz(in-band gain fluctuation 1dB)Traveling wave tube amplifier:>500MHz(in-band gain fluctuation 3dB)6.1.4 Gain (6dB below saturated output power) is divided into three levels when including medium power amplifier:
A.≥75 dB
B.≥70 dB
Not including medium power amplifier:≥37dB
6.1.5 Gain slope
Not worse than ±0.05dB/MHz (fo±18MHz)Note: f. is the center frequency of the working frequency band, the same below. 2
6.1.6 Gain stability
GB/T11444.3—1989
Gain stability is not less than ±0.5dB/d (constant excitation, constant temperature) 6.1.7 RF level adjustment
0~20dB continuously adjustable
6.1.8 Amplitude/frequency characteristics
≤0. 4dBpβ (fo±14. 4MHz)
<1.0dB,-,(fo±18MHz)
6.1.9 Input standing wave ratio
Klystron amplifier: 1.25:1 (max)TWTA amplifier: 1.3:1 (max)6.1.10 Output standing wave ratio (cold state)
Klystron amplifier: 1.25:1 (max)TWTA amplifier: 1.3:1 (max)6.1.11 Load standing wave ratio
Klystron amplifier: 2.0:1 (max)TWTA amplifier: 1.5 ：1 (maximum) 6.1.12 Multi-carrier intermodulation ratio
<-24dBc (when the total power of two equal carriers is 7dB lower than the saturated output power of a single carrier) 6.1.13 AM/PM conversion coefficient
Klystron amplifier: <4/dB (when it is 6dB lower than the saturated output power) Traveling wave tube amplifier: <3%/dB (when it is 6dB lower than the saturated output power) 6.1.14 Residual AM
<—-40dBc (F.<4kHz)
≤—20(1+lgF)dB c
(4kHz
Tip: This standard content only shows part of the intercepted content of the complete standard. If you need the complete standard, please go to the top to download the complete standard document for free.