Weak wireless signal strength often becomes a major obstacle to comfortable work, especially in offices or large apartments with thick walls. Equipment owners Mikrotik RouterOS offers a significant advantage over home router users, as it provides deep control over the radio interface. Unlike standard solutions, it allows fine-tuning not only transmitter power but also receiver sensitivity parameters and client interaction algorithms.
However, blindly increasing parameters without understanding the physics of radio waves can have the opposite effect—the network will become unstable or even stop working altogether. Many factors must be considered, from interference in the air to the quality of the antenna and feeder line. In this article, we'll explore proven signal boosting methods, starting with software settings. tx-power and ending with the installation of external amplifiers.
Analysis of the current state of radio broadcasting
Before making any configuration changes, it's important to thoroughly diagnose the current situation. Using the built-in scanner scan In WinBox or a terminal, it will show channel load and noise levels. A high noise floor is often a more critical issue than low transmitter power, as it "drowsies out" the desired signal.
Please note the meaning SNR (Signal-to-Noise Ratio) is the signal-to-noise ratio. This parameter determines the actual speed and stability of a connection, not just the signal level in dBm. If the SNR is low, increasing the power may not yield any results until the interference sources are resolved.
- 📡 Neighboring networks: operating on the same or overlapping channel create interference.
- 🔌 Household appliances: Microwaves, baby monitors, and Bluetooth devices operate in the 2.4 GHz band.
- 🏗️ Design features: Mirrors, metal structures and thick concrete greatly attenuate (weaken) the signal.
⚠️ Attention: Channel load data may fluctuate throughout the day. Conduct your analysis during peak hours when your neighbors are actively using the internet to get a realistic picture.
Setting the transmitter power (Tx Power)
The main tool for power control is the parameter tx-power in the section WirelessIn RouterOS, this parameter can be set in dBm or as a percentage of the maximum power supported by a specific board. It's important to understand that setting the maximum value isn't always optimal.
Excessive power can cause signal distortion, especially at the edges of the coverage area, resulting in a drop in speed. Furthermore, legal restrictions must be taken into account: most countries have standards for maximum radiated power (EIRP), and violations can result in fines.
For precise settings, use the terminal. The command allows you to set a specific value in dBm if the card driver supports it. For example, for the card wAP ac or SXT The ranges of acceptable values may vary significantly.
/interface wireless set wlan1 tx-power=20Remember that the power level must be matched to the sensitivity of the client devices. If the router is too loud and the client's phone has a weak antenna, the client will see the network but will be unable to send a response data packet, resulting in connection interruptions.
Antenna Calibration and Country Settings
One of the most important, but often overlooked steps is setting the Country correctly. country determines not only the available channels, but also the maximum allowable transmission power for each standard (802.11b/g/n/ac). The default is often no_country_set, which limits the power.
When you select the correct country (eg. united_states or russia(If a profile is loaded), the system will automatically apply optimal power profiles. However, if your equipment has non-standard antennas, manual calibration may be required via the parameter antenna-gain.
| Parameter | Description | Impact on signal |
|---|---|---|
country |
Regulatory restrictions | Provides access to maximum power |
antenna-gain |
Antenna gain (dBi) | Adjusts the EIRP calculation |
frequency-mode |
Frequency mode | Affects the available frequency range |
What is EIRP?
EIRP (Effective Isotropic Radiated Power) is equivalent isotropically radiated power. It is calculated as the transmitter power minus cable loss plus antenna gain. Exceeding EIRP limits is illegal.
Selecting channel width and frequency
Channel width directly impacts throughput and noise immunity. In congested environments, channel width usage 40 MHz or 80 MHz often results in a drop in speed due to being in the coverage area of several neighboring networks. In such cases, switching to 20 MHz can significantly improve stability and range.
The narrower the channel, the higher the signal energy density in that channel, which allows for more effective interference penetration. For the 2.4 GHz band in apartment buildings, it is recommended to use only 20 MHz. For 5 GHz, you can experiment with 40 or 80 MHz, if the airwaves are clear.
- 📉 20 MHz: Maximum range and penetration, lower speed.
- 🚀 40/80 MHz: High speed over short distances, low resistance to interference.
- 🎯 Frequency: Select channels that are as far away from your neighbors as possible (1, 6, 11 for 2.4 GHz).
⚠️ Attention: Interfaces and parameter names in RouterOS may differ depending on the firmware version (v6 or v7). Always consult the official documentation on the manufacturer's website before making changes to the production version.
Using external antennas and amplifiers
If software methods aren't sufficient, hardware solutions are necessary. Replacing the stock antennas with more powerful ones (with a higher dBi gain) is the most effective method. However, remember: an antenna doesn't amplify the signal; it reshapes the radiation pattern, concentrating the energy in a specific direction.
To connect external antennas to routers Mikrotik (for example, series hAP or RB) RP-SMA connectors are often used. It's important to use high-quality pigtails and cables, as low-quality cables can cause significant losses at WiFi frequencies.
☑️ Check before purchasing an antenna
In complex situations where a signal needs to be transmitted over long distances or through obstacles, external signal amplifiers (repeaters or boosters) are used, which are installed between the router and the antenna. This requires careful link calculation to avoid amplifier saturation.
NV2 and TDMA protocol optimization
In the ecosystem Mikrotik there is a proprietary protocol NV2, which can radically change network behavior. Unlike standard 802.11, NV2 uses client polling (TDMA), which avoids collisions and efficiently utilizes the airwaves even with a large number of connected devices.
Enabling NV2 can increase overall network throughput in densely populated areas. However, this mode requires configuring all access points into a single system and is not always compatible with older client devices. For home use with a variety of devices, it's best to leave the default mode. ap-bridge.
/interface wireless set wlan1 protocol=nv2
/interface wireless set wlan1 tdma-period-size=2
Experiment with the parameter tdma-period-sizeReducing this value reduces latency, but may reduce overall throughput. Adjusting this parameter requires testing under real-world network conditions.
Router location and physical environment
No amount of settings will help if the router is located in an alcove, behind a TV, or on the floor. Radio waves travel poorly through water (like aquariums or people), metal, and thick concrete. The ideal location is in the center of the apartment, high up, and away from large metal objects.
Antenna orientation also plays a role. For vertical polarization (the standard for most devices), the antennas should be vertical. If the antennas are detachable, they can be pointed toward areas with poor reception, although the Berbentuk omnidirectional antenna pattern is "doughnut-shaped," and pointing them directly at the client isn't always effective.
- 🏠 Center of the room: provides uniform coverage in all directions.
- 📏 Height: the higher, the fewer obstacles in the signal path.
- 🔋 Batteries: Keep the router away from heat sources and direct sunlight.
FAQ: Frequently Asked Questions
Is it possible to flash Mikrotik to increase its power beyond the factory settings?
Technically, RouterOS does have hidden or advanced settings, but exceeding the chip's physical limits is impossible. Exceeding factory limits through modified firmware can lead to overheating and hardware failure, and is also a violation of the law.
Why did the speed drop after increasing the power?
A "dead phone" situation has likely arisen: the router can hear the client, but the client can't hear the router. The client device (smartphone) has a low-power transmitter and can't "shout" back to the router, which is operating at maximum power.
Which antenna is best for penetrating walls?
A high-gain antenna (e.g., 8-12 dBi) has a narrower beam pattern. This "flattens" the signal, giving it a longer horizontal range. This often helps penetrate several rooms in the same plane, but performs worse on floors above or below.
Does the power supply affect WiFi signal strength?
A high-quality power supply with low ripple is critical. Cheap power supplies can generate high-frequency interference that clogs the router's sensitive receiver circuit, reducing the actual communication range.