Can you communicate freely under weak signals?

Can also communicate freely under weak signals.

In this case, you can send a message to the other party by SMS. Although his signal is not good, as long as there are some weak signals, you can receive short messages, and he can give you the answer through short messages. Although it may not be sent for a while, it can be sent as long as the signal is better. When the signal is bad, communication by SMS is much more reliable than telephone.

I think everyone will know to choose a receiver with a low threshold. Some friends often ask: the same antenna, the same tuner, the same place, but the machines are different. Why can a machine look at one but not the other? This is the result of the threshold of the receiver. Choosing a machine with a low threshold will make your investment worthwhile.

Many friends often overlook this point. Rough wires will only lead to signal attenuation, and only a few meters long is not easy to detect. If the wire is tens of meters long, it is easy to appear. The problem is that it is often not suspected to be a wire problem, and changing from east to west can't solve the problem in the end.

The principle of signal transmission and reception of communication satellites;

Signal transmission principle: user data is processed by baseband to become the carrier of analog signal, and the carrier is converted to the used satellite frequency band by frequency converter, amplified by corresponding power amplifier, and emitted by antenna aiming at satellite.

Principle of signal reception: After receiving the signal forwarded by the satellite, the receiving antenna first undergoes low-noise amplification and down-conversion to an identifiable frequency carrier, and after demodulation, FEC removal, differential removal and descrambling, the data is recovered.