278A40 UHF Booster DTMB TV Signal Amplifier Booster Adjustable Gain For Digital Signal Outdoor Use

278A40 UHF Booster DTMB TV Signal Amplifier Booster Adjustable Gain For Digital Signal Outdoor Use

287A40 UHF signal preamplifier/trunk line amplifier group: 278A40 + 1302J
1. Designed specifically for Digital Terrestrial Television (DTT: Digital Terrestrial Television)
2. Built-in GSM mobile phone signal filter can effectively prevent the interference of mobile phone transmitting base station to UHF signal
3. A UHF amplifier with DC PASS function especially suitable for remote receiving or building multi-user receiving
4. Dual-signal output at the user end is convenient for home multi-ground equipment
5. 2-in-1. As a preamplifier, it can be used in the front end of antenna. It can also be used indoors as a trunk line amplifier.

278A40 Technical Characteristics & Technical Parameters:
1. Designed for digital terrestrial TV signal receiving, using SMD patch technology and for NXP (for Philips) low-noise components to ensure the technical performance of the product
2. Built-in GSM filter to prevent interference of mobile phone base station to UHF signal
3. Aiming at the ground signal frequencies in Shenzhen and Hong Kong, this product further optimizes the above frequencies in a targeted manner
4. DC-PASS switch is specially designed for remote receiving users and building single antenna multi-user receiving, which provides convenience for serial connection of amplifiers
5. It can be used as an antenna amplifier or an indoor trunk amplifier
6. The shell adopts a pull-out waterproof design to effectively prevent rainwater from entering
7. LED light work instructions
8. It can be installed on the wall or column (if you use cable ties to fix on the column, please take the amplifier out of the black waterproof box first, and pass the cable ties through the 2 square holes behind the black waterproof box)

- Input frequency range: 470 ~ 862MHZ
- Gain: 25-40dB
- Gain control: 0-15dB
- Filter frequency: 862~900, >20dB
- Noise figure: 2.0dB
- Output level: 105dBμV (maximum)
- Impedance/connection: 75Ω / F type English system
- Power supply: 12±1 VDC, 90mA max.
- Power supply output: 12±1 VDC, 210mA max.

Attention:
- The maximum gain of this amplifier is 40dB, which is suitable for use in medium signal, weak signal area or long signal line.
- If it is used in a strong signal area, buyers need to adjust the gain to a proper state according to the actual receiving situation (adjust the gain output knob by yourself).
- If you can't get a good receiving effect, please consult us.

Use of DC PASS Switch:
Situation A:
When receiving HK signal, the remote receiving customer needs to use 2pcs amplifiers in series (schematic diagram: antenna-amplifier-filter-amplifier-power supply-receiving equipment), so it is necessary to DIY the second stage amplifier a direct current passes through the device, so that one power supply can be used to supply power to the first (antenna end) and the second amplifier at the same time.

Therefore, this product has designed a DC direct current pass switch for this purpose. When using a series amplifier, buyers need to turn on the power pass switch by themselves.

Situation B:
For example, in the buyer's signal receiving system, when signal line is too long (signal attenuation) or the signal needs to be transmitted to another place, you need to connect the amplifier in series. This product can function as a trunk line amplifier.


1302J Characteristics and Power Supply Parameters:
1. 13V regulated output: in order to prevent the customer's signal line from being of poor quality, causing the voltage to reach the amplifier to work badly, there is a reserved space for the power supply voltage design
2. With short-circuit protection function
3. Power supply has a separate switch design and power supply working indication (blue)
4. Double output of output signal

- Input frequency: 40-862MHZ
- Impedance / connection method: 75Ω/F English system
- Output voltage/current intensity: 13±1VDC/300mA max.
- Applicable power supply: 100-240 VAC, 50/60Hz, 5W
- Appearance size: 113x60x31.4mm

Package Included:
- 1 x Set of 278A40 UHF Booster