Suitably used in bi-directional transmission (can be reserved) and signal equalization of multi-class trunk transmission or high-required distributive network. Adopt PHILIPS, NEC imported power doubler modules. Audio pre-amplifier is low-noise microwave tube push-pull amplifier to insure enough gain. It has 1 input and 2 outputs, and each connection has over-current protection. The output branch or distributiveness can be changed following it. Double-equalizer is used, so adjusting multi-class transmission flatness is simple and convenient. Attenuator and equalizer are plug-in, so customers can choose fixed or adjustable style. High-reliable switch power (or linear power) and strict waterproof and anti-thunder design insure steady durative work.
-Product Display
-Product description
SA822 rf bi-directional amplifier is a high-performance device with 1 input and 2 output ports and overcurrent protection. The audio preamplifier uses a low-noise microwave tube push-pull amplifier with high gain and low noise. The dual equalizer design is convenient for adjusting the multi-level transmission flatness, and the attenuator and equalizer plug-in design can meet different needs. In terms of forward transmission, there are a variety of frequency ranges to choose from, such as 47/54/85~862MHz, etc., and it performs well in many technical parameters such as rated gain and in-band flatness. Reverse transmission also has good performance in parameters such as frequency range and return loss. It is suitable for a variety of cable TV network application scenarios such as two-way transmission, multi-level trunk transmission or signal balancing of high-standard distribution networks.
-Product advantages
High gain and low noise: The audio pre-amplifier adopts a low-noise microwave tube push-pull amplifier, which makes it provide high gain while effectively reducing noise, so as to output a clearer and more stable signal, compared with some ordinary amplifiers, it can better maintain the quality of the signal in the signal amplification process.
Wide frequency range and good in-band flatness: There are many options for the forward transmission frequency range such as 47/54/85~862MHz, and the reverse transmission also has a corresponding wide frequency range, and the in-band flatness in their respective frequency ranges is excellent. This means that the signal can be amplified in a more balanced manner at different frequencies, and there will be no over-amplification or under-amplification of some frequency signals, so as to ensure the consistency and stability of the signal in the entire frequency band.
High Output Level and Low Distortion: At rated gain, the SA822 provides high output levels for signal strength requirements such as long-distance transmission or multi-user allocation. At the same time, through reasonable circuit design and optimization, the intermodulation distortion, intermodulation distortion and other indicators are well controlled, which effectively reduces the signal distortion and ensures the accuracy and reliability of the signal.
Functional design is more reasonable:
Double equalizer design: The double equalizer design is used to facilitate the adjustment of multi-level transmission flatness. In the complex cable TV network, the signal may appear different degrees of attenuation and distortion after multi-level transmission, and the design of the double equalizer can adjust and compensate the signal more finely, so that the signal always maintains a good quality during the transmission process, which is a function that some traditional one-way amplifiers or simple two-way amplifiers do not have.
Plug-in attenuator and equalizer: The attenuator and equalizer are designed as plug-ins, and users can flexibly choose fixed or adjustable plug-ins according to the specific conditions and needs of the actual network to meet different signal conditioning requirements. This design greatly improves the adaptability and scalability of the device, and can better cope with various complex and changeable network environments and the individual needs of different users.
Higher Reliability and Stability:
Overcurrent Protection Ports: Equipped with 1 input and 2 output ports, each with overcurrent protection. When there is abnormal current fluctuation or short circuit and other faults in the network, the overcurrent protection can cut off the circuit in time to prevent the equipment from being damaged due to overcurrent, which effectively protects the safety of the equipment, and also reduces the risk of paralysis of the entire network system due to equipment failure, which is more reliable than the amplifier without overcurrent protection.
A variety of power supply options and lightning protection: the power supply voltage is available in a variety of options, which is convenient for users to choose according to the actual situation, and has a certain lightning protection ability, which can resist the damage to the equipment by natural disasters such as lightning strikes to a certain extent, and further improve the stability and reliability of the equipment in outdoor or harsh environments.
Wider application scenarios: Due to its comprehensive advantages in performance parameters, functional design and reliability, SA822rf is not only suitable for conventional bidirectional transmission systems, but also can meet the needs of multi-level trunk transmission, signal balancing of high-standard distribution networks and other complex cable TV network applications
-Main application
Cable TV network
In the cable television network system, bidirectional amplifiers are widely used in the signal transmission of trunk and branch lines. In trunk transmission, it can amplify the TV signal emitted by the front end and then transmit it to various branch points. In feeder transmissions, it can further amplify and distribute the signal to individual user terminals. For example, in a large community cable television network, a two-way amplifier will be installed on the trunk line from the cable TV room of the community to the buildings, and the signal will be amplified and transmitted to the distribution box of each building, and then a small two-way amplifier may also be installed on the branch line from the distribution box to the user's home to ensure that each user can receive a clear TV signal.
Satellite TV reception system (in some cases)
In some complex satellite TV reception scenarios, bidirectional amplifiers are also used when the signal needs to be distributed inside a building or in a large area. For example, in large buildings such as hotels and hospitals, satellite TV signal receiving antennas receive signals and transmit them to various rooms through cables. Due to the long transmission distance or the need to connect multiple terminal devices, the bidirectional amplifier can amplify and distribute the signal to ensure that every room can receive a good satellite TV signal.
IPTV system (similar in some cases to cable TV)
In an IPTV system, although the signal is mainly transmitted based on the IP network, in the last mile access part, that is, from the network access point to the user's TV terminal part, when the signal is attenuated, the bidirectional amplifier can also play a role in supplementing the signal strength. For example, in the network renovation of some old communities, the quality of the network line is poor, and the bidirectional amplifier can help enhance the IPTV signal and improve the user's viewing experience.
-WorkShop
-Our Team
| Item |
Unit |
Technical Parameters |
| Forward Transmission |
| Frequency Range |
MHz |
47/54/85~862 |
47/54/85~750 |
47/54/85~550 |
| Rated Gain |
dB |
≥30 |
≥30 |
≥30 |
| Flatness In Band |
dB |
±0.75 |
| Rated Input Level |
dBμV |
72 |
| Rated Output Level |
dBμV |
102 |
102 |
102 |
| Gain Adjustable Range |
dB |
Adjustable: 0~15dB, Fixed: 3,6,9,12,15 |
| Slope Adjustable Range |
dB |
Adjustable: 0~24dB, Fixed: 6,9,12,15,18 |
| Noise Figure |
dB |
≤12 |
| CTB |
dB |
60 |
| CSO |
dB |
60 |
| Return Loss |
dB |
≥14 |
| Reverse Transmission |
| Frequency Range |
MHz |
5~30/42/65(or specified by user) |
| Flatness In Band |
dB |
±0.75 |
| Return Loss |
dB |
≥14 |
| Rated Gain |
dB |
0 or 20 selected |
| MAX Output Level |
dBμV |
≥110 |
| Gain Adjustable Range |
dB |
0~15 |
| Slope Adjustable Range |
dB |
0~10 |
| General response |
| Power Voltage (50Hz) |
V |
A: ~(130-265) V, B:~(30-80)V ,C:~(90-130)V |
| Thunder Stroke |
KV |
5 (10/700μS) |
| Dimension |
mm |
270×215×118 |
FAQ
1. What are the payment terms that you support?
Usually, we accept T/T, PayPal, Western Union and so on. You can select the termsof payment which is more convenient for you.
2. What about the lead time?
Usually, if there's stock, we ship the goods within 3-5 working days after the deposit is confirmed. lf it is out of stock. the lead time depends.
3.How about the shipping?
When the package is small, we normally choose FedEx, DHL, TNT, and UPS and so on, while the goods have high weight and volume, we suggest using air or sea shipment.
4. How can I place an order?
(1) Negotiation is agreed upon for the product price and specifications.
(2) The Proforma invoice will be sent for confirmation.
(3)After the agreement on the proforma invoice, the customer makes the deposit
(4) Manufacturing will be started as soon as the payment is confirmed by our bank
(5) Ship out the goods within the agreed delivery deadline.
5.Can you do OEM for us?
Yes. If there is a certain order quantity, we can do OEM including printing, logo, and customized model for you.
6.How about the Warranty?
There are 12 months for the warranty. While the warranty is not responsible for those broken by violence or updated with other brands.
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