The problem of "dead zones" in an apartment or office is familiar to many network equipment owners. Often, the cause lies not in faulty equipment, but in incorrect factory data transmission settings. MikroTik's RouterOS operating system provides administrators with powerful tools for fine-tuning wireless interfaces.
Unlike home routers with limited functionality, you can fine-tune every aspect of your radio signal. Proper setup allows you to get the most out of your existing equipment without purchasing additional amplifiers. We'll explore the technical aspects of increasing transmitter power, which will help stabilize your connection.
However, it's important to understand that blindly increasing the values doesn't always produce the desired result. There are many nuances related to the physics of wave propagation and legal restrictions. In this article, we'll discuss how to properly configure tx-power and other parameters to achieve the best coverage.
Choosing the right country and legal restrictions
The first step in setting up any wireless equipment is selecting the country. This isn't just a formality, but a critical parameter that determines the available frequencies and maximum permissible transmit power. In the MikroTik system, this parameter is set in the menu. Wireless in the field country.
Each country has its own regulatory framework, outlined in IEEE standards and local laws. For example, the United States permits higher power levels on certain channels than the European Union. If you select a country with strict restrictions, the system will forcibly limit the output power, even if you try to turn the slider to its maximum.
⚠️ Warning: Setting the country to "no_country_set" or "superchannel" removes software power restrictions, but may violate your country's laws and interfere with other communications services. Use these settings only in shielded areas or for testing.
To work legally in Russia, you must select the appropriate profile. This will ensure access to all permitted channels and optimal settings. antenna-gainIgnoring this step often results in users being unable to understand why their router isn't "breaking through" the wall, even though the settings appear to be correct.
Changing this setting requires rebooting the interface or the entire device. After changing countries, the list of available channels may change, and some frequencies may become unavailable. Always check the regulator's requirements for the latest information, as regulations are subject to change.
Setting the transmitter output power (Tx Power)
The main lever of influence on the signal strength is the parameter tx-powerIn the WinBox interface it is located in the tab Wireless -> Wireless Interfaces -> double click on the interface -> tab Tx PowerHere you can set the value in dBm or select the operating mode.
The default value is often 0 or min-regs, which means using the minimum value permitted by the regulations of the selected country. To increase the power, you need to switch the mode to all-rates-fixed or all-rates-fixed-0 and manually set the desired value in dBm.
It's worth noting that increasing power doesn't have a linear effect on range. A 3 dBm increase doubles the signal strength, but the difference may be barely noticeable. Furthermore, balancing is important: if the router is very loud and the client device (such as a smartphone) has a weak transmitter, the connection will be unstable.
/interface wireless set wlan1 tx-power-mode=all-rates-fixed tx-power=20This terminal command will set a fixed power of 20 dBm for all transmission speeds. It's important not to exceed the maximum values specified in the specifications for your equipment model. MikroTikExceeding this limit may cause the chip to overheat and reduce the lifespan of the device.
Using Antenna Gain
Parameter antenna-gain This often causes confusion among novice administrators. This value doesn't increase the actual transmitter power, but merely adjusts the signal level (EIRP) displayed in logs and the monitoring interface. Essentially, it's a software adjustment to match the actual physical antennas.
If you use external antennas with a known gain (e.g., 5 dBi or 9 dBi), this value must be specified in the interface settings. This will allow the system to correctly calculate the maximum transmit power in accordance with legal regulations (EIRP = Tx Power + Antenna Gain).
On the menu Wireless Interfaces find the field antenna-gainIf you have standard built-in antennas, you typically leave the value at 0 or specify the standard antennas if required for specific calculations. For most scenarios involving replacing standard antennas with more powerful ones, changing this parameter helps the system "understand" that the power limits can be adjusted.
However, if you simply increase the setting without changing the physical antenna, there will be no real signal boost. You'll only fool the monitoring system. Real signal boosting is achieved only by physical means: replacing antennas or installing repeaters.
| Parameter | Unit of measurement | Impact on signal | Typical value |
|---|---|---|---|
| tx-power | dBm | Direct (chip power) | 15 - 30 dBm |
| antenna-gain | dBi | Indirect (calculation adjustment) | 0 - 10 dBi |
| EIRP | dBm | Overall efficiency | Up to 100 mW (20 dBm) |
| channel-width | MHz | Spectral width (noise/speed) | 20 / 40 / 80 MHz |
Optimization of channel width and frequency ranges
Signal strength isn't just about watts, it's also about airwave clarity. In today's densely populated areas, the 2.4 GHz band is often clogged with neighboring routers. Channel bandwidth usage channel-width 40 MHz in this range often results in a drop in speed and an increase in errors.
For maximum range and penetration in the 2.4 GHz band, it is recommended to force the channel width 20 MHzThis narrows the spectrum, increasing the signal energy density and improving the signal-to-noise ratio. In the 5 GHz range, it is safe to use 40 MHz or 80 MHz, since there is less interference there.
Selecting a specific frequency (channel) also plays a role. Use the built-in tool Wireless Scanner in WinBox. It will show the channel load in your location. Choose channels that are farthest from strong nearby signal sources.
⚠️ Warning: Automatic channel selection (scan list) may be unstable. If the network is critical, it's better to manually select the frequency after scanning the airwaves with a scanner.
Transition to the 5 GHz band (standards 802.11ac or 802.11ax) radically solves interference problems, but has a shorter physical range due to its higher frequency. For longer distances, a powerful 2.4 GHz signal is sometimes more advantageous than a fast but short 5 GHz signal.
What is the difference between dBm and dBi?
dBm is an absolute unit of power measurement (decibels relative to 1 milliwatt). dBi is a relative unit, indicating how much the antenna amplifies the signal compared to an ideal radiator. The sum of these values (plus cable losses) yields the final radiated power.
Advanced Settings: Protocols and Security
The security protocol and WiFi standard version directly impact transmission efficiency. Using outdated encryption WEP or mixed modes b/g/n may reduce overall network performance. It is recommended to use the mode only-n or only-ac to cut off slow clients.
Tab Advanced Mode in the wireless interface settings contains the parameter installationFor outdoor links or access points operating outdoors, it is recommended to select the mode outdoorThis changes the protocol's operating algorithms, increasing response timeouts, which is useful over long distances.
Also worth paying attention to is the function WMM (Wireless Multimedia). It must be enabled to prioritize traffic (video, voice). Disabling WMM may result in a drop in speed and connection instability, even if the transmitter power is set to maximum.
/interface wireless set wlan1 installation=outdoor wmm-mode=trueThis setting optimizes the radio interface for outdoor conditions. However, keep in mind that software optimization is no substitute for a physical obstacle. Metal structures and thick concrete walls with reinforcement remain the main enemies of a WiFi signal.
Diagnostics and monitoring of results
After making changes, you need to verify their effectiveness. Built-in tools MikroTik allow for detailed diagnostics. In the menu Wireless go to the tab Registrationto see the list of connected clients and signal strength (signal strength) for each of them.
The signal value is displayed in negative dBm (e.g., -65 dBm). The closer the value is to zero, the better the signal. Readings from -50 to -60 dBm are considered excellent, from -60 to -70 dBm are considered good, and below -80 dBm indicates an unstable connection.
Use a chart Sniffer or Torch To analyze passing traffic and noise levels. A high noise floor can negate all efforts to increase power. If the noise floor is high, increasing transmitter power will only add noise to the overall broadcast without improving communication quality.
- 📶 Registration Table: Shows the current signal strength of each client in real time.
- 📉 Sniffer Tool: allows you to see detailed packets and noise levels in the channel.
- 📊 Graphing: helps to track the dynamics of signal changes and the number of errors (CRC errors) over time.
Pay attention to the parameter CCQ (Client Connection Quality). This is the connection quality percentage. If the power is high and the CCQ is low (less than 50-60%), this indicates severe interference or problems with the client's equipment, making further power increase pointless.
☑️ Checking signal quality
Frequently Asked Questions (FAQ)
Why did my internet speed drop after increasing tx-power?
You've most likely created an imbalance. The router "screams" loudly, and the client hears it, but the router doesn't hear the client's response signal (which has a small antenna and power). This leads to constant reconnections and a drop in speed. Try reducing the power to a level that maintains balance, or use a repeater.
Is it possible to flash a MikroTik router to remove power limitations?
Removing software restrictions (regional codes) is possible, but this violates the laws of most countries. Furthermore, operating on prohibited frequencies or at excessive power levels can cause interference with intelligence agencies, radars, and aviation, which can result in significant fines and equipment confiscation.
What is the maximum safe wattage for home use?
For indoor use, a level of 20-23 dBm (100-200 mW) is considered safe and sufficient. Exceeding this value in an enclosed space is pointless due to signal reflection from walls and interference, and can also be harmful to health if left near the antenna for extended periods.
Will an external antenna help if I don't change the settings?
Yes, replacing the stock antenna with a higher-quality one (with a higher dBi gain) will physically increase the signal. However, it's recommended to update the parameter in the MikroTik settings. antenna-gainso that the system correctly calculates the maximum values of radiation power.