Fmuser TV-15W analog TV Transmitter portable small power UHF VHF TV transmitter


Sample/Wholesale
Price
Shipping
Carrier
Buy it Now
1 pcs sample
1333 USD
/pcs
238 USD
DHL/UPS 7-10days

2 pcs
1153 USD
/pcs
385 USD
DHL/UPS 7-10days


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The 15W UHF VHF TV transmitter is composed of three parts, a modulation unit, a power amplifier (PA) unit and a switching power supply. In the modulation unit, video signals are adjusted to the suitable modulation depth via a level adjusting potentiometer and then clamped by a diode. The audio signals are sent to a FM oscillator for frequency modulating after its frequency deviation is adjusted by the level potentiometer. The FM oscillator employs a LC oscillator and generates6.5MHz FM signal by a variable capacitance diode. The frequency of the crystal oscillator is multiplied to generate the wanted visual carrier. 6.5MHz FM signal and video signal modulate the visual carrier simultaneously. A bandpass filter will filter out unwanted components and the signals will be sent to the PA unit by a broadband amplifier.

PA unit is composed of first stage PA and final stage PA units. The first stage PA unit consists of a module and a transistor and adopts a class-A broadband amplifier. The gain of the module is 34dB and the total gain of the PA is about 54dB. Working current of the triode transistor can be calculated by measuring voltages on both ends of the resistor R6 (2W 1W).

The power supply unit contains a switching power supply which features small size, lighter weight and high efficiency and can provide over-current and short-circuit protections, so that the transmitter will work at a stable 28V DC voltage. The overall equipment uses one 28V/10A power supplies. In the case of one of the power supplies is out of order, the transmitter will be switched off into safety mode automatically.

Specifications:

General
Dimensions :120mm*400mm*420
Temperature range:0- 40’C
Relative humidity:90% (at 25’C)
Voltage:220VAC /50-60Hz  (please let us know your voltage and frequency , we can custom make for you )
Power consumption:70W
Operating channel:any appointed channel within UHF or VHF
Modulation method
Vision: negative polarity, AM
Sound: FM

TV standard:    
NTSC  ( Pleast let us know the standard you need , we can custom make for you )
Vision/sound power ratio:10:1
Output power:15W
Output impedance:50W
Unwanted radiation:in adjacent channel -50dB
Intermodulation distortion:in- band -50dB

Video characteristics
Video input voltage:1Vp-p ± 3dB
Video input impedance:75W
Vision carrier stability:± 500 Hz/Day
Amplitude vs. Frequency:0-5MHz ± 0.5dB
Random spurious S/N:50dB
Differential gain: 7%
Differential phase:5′

Audio Characteristics
Audio input level:100mV
Audio input impedance:unbalanced
Max. frequency deviation :± 50KHz
Audio harmonic distortion:40Hz – 150Hz 2%
FM S/N:60dB

15w tv 15w tv-415w tv-2  15w tv-3


Sample/Wholesale
Price
Shipping
Carrier
Buy it Now
1 pcs sample
1333 USD
/pcs
238 USD
DHL/UPS 7-10days

2 pcs
1153 USD
/pcs
385 USD
DHL/UPS 7-10days


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