How to Adjust Router Transmit Power (TX Power) for Better WiFi Coverage and Interference Reduction
Your router’s transmit power setting controls how hard it broadcasts—but maxing it out often makes things worse. Here’s how to find the right TX power level for your home and why less is sometimes more.
Most routers ship with transmit power cranked to 100%—the assumption being that more signal equals better WiFi. In practice, that logic breaks down surprisingly fast. In dense neighborhoods, maximum TX power increases interference with neighboring networks. In homes with multiple access points or a mesh system, it causes “sticky client” problems where devices refuse to roam to a closer node. Getting your transmit power right is one of the most underrated router tweaks you can make.
What Is TX Power (Transmit Power)?
Transmit power—often labeled TX Power in router settings—is the strength of the radio signal your router broadcasts, measured in dBm (decibel milliwatts). Consumer routers typically range from around 10 dBm at low settings to 30 dBm at maximum. Some routers expose this as a percentage (25%, 50%, 75%, 100%), others as an absolute dBm value, and some as a simple Low / Medium / High dropdown.
A 3 dBm increase roughly doubles the signal power. That sounds good, but doubling your own signal also doubles the interference you create for every neighboring network sharing the same channel.
Why Maximum TX Power Often Hurts Performance
Running at full power causes several well-documented problems:
- More interference with neighbors: In an apartment building, every router you can see can also “see” you. Blasting at maximum power means your signal overlaps aggressively with their channels, raising the noise floor for everyone—including yourself when packets get corrupted and must be retransmitted.
- Sticky clients: When your router has a very strong signal, devices cling to it even when they physically move closer to another access point or mesh node with a better connection. The client only roams when the signal drops to a very weak level, which may never happen if your TX power is too high. This is one of the leading causes of slow WiFi in mesh setups.
- Hidden node problem: If your router broadcasts far enough to reach clients that can’t hear each other, those clients transmit simultaneously and collide. High TX power makes this more likely in large or multi-story homes.
- Asymmetric link: Your router’s radio is more powerful than the radio in your phone or laptop. Cranking TX power means the router shouts at the client, but the client whispers back. The upstream (client-to-router) direction remains weak regardless of how loud the router is—often the actual bottleneck for video calls and uploads.
When to Lower TX Power
Consider reducing TX power in these situations:
- You live in an apartment building or dense neighborhood with many competing WiFi networks
- You have a mesh system or multiple access points and devices are slow to roam between nodes
- Your 2.4 GHz band is crowded—dropping its TX power nudges devices onto the faster 5 GHz band
- Devices near the router perform poorly despite a strong signal (a paradoxically strong signal can overwhelm the receiver)
When to Raise TX Power
Higher TX power is appropriate when:
- You have a single router covering a large, open space with no neighboring networks
- Signal is genuinely weak at the edges of your home and no mesh node or extender is practical
- You’re covering an outdoor area where the signal must travel across open air
Recommended TX Power Levels
As a starting point, networking professionals generally recommend:
- 2.4 GHz: 10–14 dBm (roughly 10–25 milliwatts). The 2.4 GHz band already travels farther than 5 GHz—it doesn’t need maximum power to cover a typical home.
- 5 GHz: 14–17 dBm (roughly 25–50 milliwatts). Higher frequencies attenuate faster through walls, so a slightly higher setting compensates without creating excessive interference.
- 6 GHz (WiFi 6E / WiFi 7): The 6 GHz band has the shortest range of the three. Use medium-to-high settings (17–23 dBm) to maintain coverage, but rely on mesh nodes for whole-home 6 GHz coverage rather than raw power alone.
If your router only offers Low / Medium / High, start with Medium on both bands and move up only if coverage at the edges of your home is genuinely insufficient.
How to Adjust TX Power on Common Routers
NETGEAR Nighthawk / Orbi
Log into your router at routerlogin.net (or 192.168.1.1). Go to Advanced → Advanced Setup → Wireless Settings. You’ll find a Transmit Power Control dropdown for each band offering 100%, 75%, 50%, and 25%. NETGEAR defaults to 100%—try 75% for a good balance in most homes.
TP-Link Archer (non-Deco)
Log in at tplinkwifi.net. Navigate to Advanced → Wireless → Wireless Advanced. Choose your band tab, then set Transmit Power to Low, Medium, or High. Medium corresponds to roughly 50% of maximum output.
ASUS Routers
Go to the ASUS router admin panel (192.168.1.1 by default). Navigate to Wireless → Professional. Choose the band, then find the TX Power Adjustment field. ASUS expresses this as a percentage. Setting 75% is a solid starting point; drop to 50% if you’re experiencing sticky-client problems with a mesh or AiMesh setup.
OpenWrt / DD-WRT
In OpenWrt, go to Network → Wireless, click the interface, then Advanced Settings. You’ll see a Transmit Power field in dBm. In DD-WRT, find the TX power under Wireless → Advanced Settings. Entering an absolute dBm value gives you precise control—start at 14 dBm for 2.4 GHz and 17 dBm for 5 GHz, then adjust from there.
How to Test Whether Your Adjustment Helped
After changing TX power, give your network 10 minutes to stabilize, then:
- Run a speed test at the edge of your coverage area and note the results before and after your change.
- In a mesh setup, walk to a location halfway between two nodes with a phone and check which node it connects to. With better-tuned TX power, the phone should connect to the closer node.
- Use a WiFi analyzer app to compare the noise floor and signal-to-noise ratio on your chosen channel. Lower interference = higher SNR = faster reliable throughput.
If range decreased significantly with a lower TX power setting, consider adding a mesh node or WiFi extender instead of cranking power back up. See our guide on how to extend your WiFi range for the best options, and our WiFi channel width guide for the complementary setting that works alongside TX power to maximize throughput.
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