The parameters that must be reviewed in a radio link for alignment are: Signal Level of each polarity and SNR.

It is recommended that the signal values ​​be between -45dBm and -60dBm (the higher the better but not exceeding -45 dBm), the signal between polarities is recommended to be equal but can have a maximum difference of 4dB and the value of SNR that is a value of 32 dB or more. If the SNR value is very low (example: 10 dB) it represents that the noise level is high and is close to the signal level.

The alignment of a radio link is critical to ensure effective and reliable communication between two points. During this process, there are several important parameters that must be reviewed and adjusted to optimize link performance.

Although the minimum acceptable values ​​may vary depending on the specific application, link distance, equipment used, and frequency spectrum, here we provide a general guide on the most important parameters to consider and the values ​​that are commonly considered acceptable or desirable.

1. Signal Level (RSSI)

Received Signal Level (RSSI) is a measure of the power of the received signal. For most links, a high enough RSSI value is sought to ensure reliable communication.

• Minimum acceptable values: This can vary, but generally an RSSI of at least -70 dBm is sought for high capacity data links. For less demanding applications, an RSSI of -80 dBm may be acceptable.

2. Signal to Noise Ratio (SNR)

The Signal to Noise Ratio (SNR) measures the difference between the signal level and the background noise level. A high SNR indicates that the signal is much stronger than the noise, which is desirable.

• Minimum acceptable values: An SNR of 20 dB is generally considered good for most applications, although some may require higher values ​​to achieve maximum performance.

3. Signal Quality

This parameter can include measurements such as bit error rate (BER) or packet error rate (PER). It indicates how “clean” the signal is and directly affects link performance.

• Minimum acceptable values: Ideally, the BER should be as low as possible, preferably less than 1×10^-6. For PER, values ​​less than 1% are generally acceptable.

4. Channel Bandwidth

Channel bandwidth affects the data capacity of the link. Wider channels offer greater capacity but may be more susceptible to interference.

• Minimum acceptable values: Depends on link capacity requirements. It is important to choose a bandwidth that balances capacity and resistance to interference.

5. Physical Alignment

Precision physical alignment of antennas is crucial to maximizing signal quality.

• Minimum acceptable values: The alignment should be as precise as possible. Laser alignment systems or integrated alignment assistance systems can help achieve optimal alignment.

Additional considerations

• Interference: Evaluates the presence of interference sources that may affect the quality of the link.
• Fresnel Zone: Ensures the Fresnel zone is free of obstructions to minimize signal losses.
• Polarization: Correctly aligns the polarization of the antennas to minimize signal drift and cross-talk.

Remember that these values ​​are general and may vary depending on the equipment and specific link conditions. It is important to consult the manufacturer's technical documentation and perform field tests to determine the optimal values ​​for your particular situation.