Increasing the wireless signal strength on equipment Mikrotik — a task that requires a comprehensive approach, not just mechanically adjusting a slider in the interface. Many users mistakenly believe that increasing the parameter Tx Power Increasing the gain to its maximum value will solve the problem of "dead zones" indoors or outdoors. In reality, the physics of radio waves dictates its own conditions: one-sided transmission amplification without taking into account the receiver's sensitivity often leads to an asymmetrical communication channel, where the router "shouts" but doesn't hear responses from client devices.
To achieve real results, it is necessary to analyze the current antenna configuration, select the correct frequency range and optimize the protocol software settings. Wireless. Legislation in most countries limits the maximum equivalent radiated power (EIRP) to 100 mW (20 dBm) for indoor use., and exceeding these limits can lead to fines or disruption to critical infrastructure. In this article, we'll cover the technical aspects of configuration that will allow you to get the most out of your equipment. RouterOS, while remaining within the framework of reasonable and safe use of the spectrum.
Analysis of hardware limitations and antenna system
The first step to increasing coverage is understanding the physical characteristics of your device. Routers Mikrotik series hAP, cAP or LHG have different gain factors for their built-in antennas, which directly impact the overall signal strength. Trying to compensate for a weak antenna with software gain is often pointless, since antenna gain (dBi) is a fixed physical quantity that depends on the design of the emitter.
If you're using external antennas, it's critical to ensure their impedance matches the router port (standard is 50 ohms). Using antennas with inappropriate impedance can result in signal reflection back to the transmitter, causing overheating and even failure. RF module. In the interface WinBox Always check that the type of connected antenna (Omni, Sector, Dish) matches the selected profile in the wireless settings.
⚠️ Attention: Never connect or disconnect external antennas while the router is powered on. Static electricity or a power surge during connection can instantly burn out the sensitive radio chip, requiring a board replacement.
It's also worth considering that different models support different frequency bands. Devices that only operate in the 2.4 GHz band won't be able to provide high speeds over long distances due to airborne noise, even at maximum power. Switching to 5 GHz or using dual-band models often provides a more noticeable improvement in connection quality than fine-tuning (gain tuning) in the older band.
Setting Tx Power and Regulatory Domains
The main tool for power management in RouterOS is a parameter TX Power, available in the menu WirelessHowever, simply setting the maximum value is not the best strategy. You first need to configure it correctly. Country (Country), as this selection determines the list of available channels and the maximum permitted power. If you select a country with strict restrictions (such as the US or EU countries), the power slider will prevent you from exceeding the legal limit.
For experimentation and testing in an isolated environment, some users choose the mode no_country_set, which removes software restrictions. This allows you to set the power level above the standard 30 dBm, if your hardware supports it. However, remember that in this mode, you assume full responsibility for compliance with the radio spectrum regulations in your country.
Risks of using no_country_set
Using this mode in populated areas may cause interference with weather radars or military installations operating in the 5 GHz band, which could have serious legal consequences.
The optimal setting often lies somewhere in the middle: the power should be sufficient for the client device (smartphone, laptop) to reach the router. If the router's power is 100 mW and the smartphone's is 15 mW, you'll see a full signal strength at long distances, but the internet won't work. power balance more important than its absolute maximum.
Optimization of the 2.4 GHz and 5 GHz frequency bands
Frequency band selection plays a crucial role in range and stability. The 2.4 GHz band has the best wall penetration, but it's extremely congested. Microwaves, Bluetooth devices, and neighbors' routers all operate in this band. Increasing power in this band often only adds noise to the overall mix without improving signal quality (SNR).
The 5 GHz band offers more clear channels and less noise, but is less effective at penetrating obstacles. To increase coverage in 5 GHz, Mikrotik It is recommended to use channel width 20/40/80 MHz Use with caution. A narrow channel (20 MHz) is less susceptible to interference and has a higher energy density per hertz, which can improve range in challenging conditions.
When setting up dual-band routers, it makes sense to separate the zones of responsibility: leave 2.4 GHz for IoT devices and older gadgets, and use 5 GHz for the main traffic. Setting up Band in the wireless profile, it allows you to force clients to switch to a less congested range.
Using NV2 and TDMA protocols for long-range links
For organizing wireless bridges (Point-to-Point) or access points with a large number of clients, a standard protocol 802.11 may be ineffective due to collisions. Protocol NV2 (Nstreme version 2), developed Mikrotik, uses technology TDMA (Time Division Multiple Access). This allows the router to poll clients itself, eliminating data packet collisions.
Mode tdma-period-size Allows fine-tuning of latency and throughput. Reducing the polling period reduces ping, but can reduce overall throughput over long distances. For links longer than 5-10 km, using NV2 often provides a stability boost comparable to increasing antenna power.
However, it's worth remembering that NV2 is a proprietary protocol. Client devices must support it (usually other devices). Mikrotik). Regular smartphones and laptops will not be able to connect to an access point operating in wireless mode. ap-bridge with NV2 enabled unless a special compatibility mode is used.
| Parameter | 802.11 standard | NV2 Protocol | Impact on power |
|---|---|---|---|
| Access method | CSMA/CA (random) | TDMA (scheduled) | Reduces packet loss |
| Latency | Unstable | Predictable | Improves responsiveness |
| Range | Limited by noise | High (up to 20+ km) | Effective use of signal |
| Compatibility | All devices | Only Mikrotik | Requires a homogeneous network |
Directional antennas and sector coverage
If an omnidirectional antenna's power is insufficient, the most effective way to boost the signal is to replace it with a directional antenna. High-gain antennas (15 dBi, 20 dBi, and higher) focus radio wave energy into a narrow beam. This doesn't create new energy, but redistributes existing energy, significantly increasing the range in a specific direction.
For covering large areas, such as a warehouse or outdoor courtyard, sector antennas are effective. By installing three antennas with a 120-degree aperture, you can create a 360-degree coverage zone with a much higher signal strength in each zone than a single powerful omnidirectional antenna. In the settings Mikrotik This is achieved by creating several virtual interfaces WLAN at different frequencies.
⚠️ Attention: When installing directional antennas (for example, SXT or LHG) Accurate alignment (pointing) is critical. An error of just a few degrees can lead to a complete loss of the link, as the beam becomes very narrow.
When using external antennas, do not forget to update the parameter antenna-gain in the wireless interface settings. This value is used by the system to calculate the maximum allowable transmitter power to ensure the EIRP limit is not exceeded. If you installed a 10 dBi antenna but the settings remain at 0 dBi, the router may not allow full power or, conversely, violate the regulations.
☑️ Checking the antenna system
Radio channel diagnostics and monitoring
After making configuration changes, diagnostics must be performed. Built-in tools Mikrotik, such as Sniffer And Torch, allow you to analyze passing traffic, but to assess the quality of the radio channel it is better to use the section Wireless -> Registration Table. The actual signal level is displayed here (Signal Strength) and noise level (Noise Floor) for each connected client.
The difference between the signal level and the noise level is called SNR (Signal-to-Noise Ratio)This is the more important indicator than absolute power. If the signal is -60 dBm and the noise level is -90 dBm, the connection will be excellent. If the signal is -60 dBm and the noise level is -65 dBm (due to a powerful neighboring router), the connection will be intermittent, and increasing the power won't help—you'll need to change the frequency.
For continuous monitoring, we recommend setting up log sending or using external monitoring systems (Zabbix, The Dude) by connecting to the router via SNMP. This will allow you to track signal strength changes over time and quickly respond to new sources of interference.
Frequently Asked Questions (FAQ)
Is it possible to flash Mikrotik with third-party firmware to increase its performance?
Technically, this is possible, but highly discouraged. Third-party firmware can remove software restrictions, but it cannot change the physical characteristics of the radio module. Furthermore, this will void the warranty and may lead to unstable operation or device failure due to incorrect currents.
Why doesn't increasing Tx Power improve internet speed?
Speed is limited by channel bandwidth and interference levels. If you increase power but the noise level remains high, speed will not increase. Furthermore, too much power can cause intermodulation distortion, which will lead to a drop in speed.
What is the maximum power that can be set without breaking the law?
In most countries, the indoor limit for the 2.4 GHz band is 100 mW (20 dBm) EIRP. Outdoor limits and other bands may vary. Always check local radio spectrum regulations.
Will a signal booster (repeater) help with Mikrotik?
Using external amplifiers (LNA/PA) is possible, but requires a professional approach. Cheap Chinese amplifiers often introduce their own noise and distortion, worsening the situation. It's better to use high-quality antenna equipment with the required gain.