VHF TV Transmitter
Equipment rated specification ●Power range: ~AC380V±10；220V±20% ●Frequency: 50±2Hz； ●Designed ambient condition of equipment: Indoor use ●Above sea level height: up to 3500 m ●Atmospheric pressure: 86～106kPb ●Ambient temperature: 0°C to 45°C General Performance Working frequency: 470MHz —...
Equipment rated specification
●Power range: ~AC380V±10；220V±20%
●Designed ambient condition of equipment: Indoor use
●Above sea level height: up to 3500 m
●Atmospheric pressure: 86～106kPb
●Ambient temperature: 0°C to 45°C
Working frequency: 470MHz — 860MHz.
Nominal load resistor impedance 50 Ω coaxial, reflection loss ≥ 26 dB.
Rated output power ：3KW.
Overall Machine Technology Specification
Specification of vision part
Video input level:
1Vp-p ± 3dB positive
Sync level 0.3Vp-p
Peak white level 0.7Vp-p
Video input impedance: 75 Ω（Coaxial）
Reflection loss ≥ 30dB .
Frequency 0MHz ～ 6MHz
Periodic clutter signal to noise ratio: 50dB（peak to peak）
Continuous random clutter signal to noise ratio:
average root value（no weighted）≥ 50dB
average root value（weighted）≥ 56dB
Useless transmission power of nearby outside channel is lower than carrier 60dB
Useless transmission power of nearby inside channel is lower than carrier 40dB
2T sine square wave distortion Kp ≤ 2 %
2T sine square wave distortion to bar pulse amplitude ratio Kpb ≤ 2 %
Line frequency tilt Kb ≤ 2 %
Field frequency tilt K50 ≤ 2 %
Brightness nonlinear distortion ≤ 10 %
Differential gain distortion DG ≤ 5 %
Differential phase distortion DP ≤ 5 °
Chroma and brightness gain difference ≤ 10 %
Chroma and brightness delay difference ≤ 30ns
Variation of vision output power ≤± 0.25dB
Carrier stability in three months ≤ ± 50 0Hz/ three months
Blanking level stability ≤ 2.5%
Carrier audacious phase modulation: ± 5 °
Mode of modulation: amplitude modulation , negative pole
Amplitude degree ≤ 87.5 %
Difference of sound carrier and vision carrier: 6.5MHz ± 0.001MHz
Radio frequency sync level: 100%
RF blanking level: 75% ± 2.5%
RF white level: 12.5% ～ 15%
Specification of sound part
Output power: (relative to vision output) － 10dB
Carrier stability (based on vision carrier）better than ±5 00Hz/ three months
Maximum frequency deviation: ± 50kHz（100% modulation）
Audio input level range: 0 ± 6dBm
Audio input impedance: 600 Ω balanced
Modulation ability: bigger than ± 100kHz frequency deviation
Amplitude frequency response: 30Hz ～ 15kHz ≤± 1 .0 dB
Pre emphasis time: 50us
FM noise to signal ratio: ≥ 60 dB（1kHz,100%modulation）
Non linear distortion : 30Hz ～ 15kHZ ≤ 1%
Amplitude modulation noise (no modulation): ≤ － 46dB
Inner carrier noise (100% modulation): ≤ － 45 dB
Useless radiation power : lower than carrier 60dB
Pre emphasis time constant: 50us
1.We can produce
We can produce the transmitter according to the customer’s requirement. Regarding the input power, it is can be adjusted according to the customer’s local condition, as well as equipping monitoring system and timing switch system.
2.Terms of payment
L/C and T/T
It is according to the customer’s quantity requirement. For example, 1kw, it will take about 7 working days after the contract effective.
For 3-5kw, it will take about 15 days.
4.Warranty and after-sales service
It is one year after delivery. For the non-personal fault, we offer free maintenance and spare parts. After the warranty, we only charge the cost.
5.Installation and debugging
We can offer the service of installation and debugging. The buyer should provide the salary, room and board of our staff, as well as arranging the translator. Our staff only takes in charge the installation on the ground. We don’t take the aerial work and heavy manual work. The infrastructure construction and signal source should be offered by the buyer and settled before our staffs arrive at the site.
6.Training and acceptance inspection
We will offer drawing and instrument operation manual. The buyer will take the acceptance inspection on performance. The training for the buyer’s staff can be taken during the acceptance inspection period.