Measure the client’s signal and the radio conditions at the problem location before changing anything. A small, verified transmit-power adjustment can help when coverage is marginal, but a second, properly placed access point is the more dependable fix when clients still have weak signal or the building has a persistent dead zone. More power is not automatically better: the client must be able to transmit back, and extra overlap can increase interference.
Start with the client, the location and the radio environment
Wi-Fi problems are often diagnosed from the access point’s perspective: its status page shows a strong transmission level, so the network appears healthy. The device at the edge of coverage may see a different reality. A phone, tablet or laptop generally has less transmit power and a smaller antenna than the access point. The AP can therefore be loud enough for the client to hear while the client’s reply is too weak to reach the AP reliably.
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Record what happens at the exact spot where service fails or slows:
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1Fix the driver behind crashes, sound loss and screen glitches2Clear out junk files and repair common Windows errors3Scan for outdated or missing drivers - takes under a minute- Measure the client’s received signal while it is in normal use, not just beside the AP.
- Check whether one device is affected or several different clients show the same behavior.
- Note walls, floors, cabinets, metal, mirrors and other obstructions between the client and AP.
- Look for nearby networks or other radio sources that could raise channel utilization or interference.
- Document the AP’s position and antenna orientation before moving equipment or changing settings.
Ubiquiti’s guidance recommends measuring signal and coverage before installation (including mock positioning), during installation and afterward, because the building and surrounding RF environment can invalidate a theoretical coverage map. Its AP Antenna Radiation Patterns article specifically warns against creating unwanted coverage, such as APs hearing one another or other APs on the same channel.
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Do not apply a universal “good signal” number from a different building or device. The supplied vendor guidance establishes no single threshold that guarantees performance for every client, band or application. Use a repeatable measurement at your own problem locations instead.
What increasing transmit power actually changes
Cisco Meraki states that “the transmit power of an AP affects the wireless coverage area and the maximum achievable signal-to-noise ratio.” In practical terms, raising power can make the AP’s signal usable farther away and can improve the margin between the desired signal and background noise. It does not remove walls, change the client’s antenna, or make a congested channel quiet.
Transmit power is only one part of the link budget. Wi-Fi communication is two-way: the AP sends frames to the client, and the client must send acknowledgements and data back. If the AP’s signal reaches a distant device but that device cannot transmit back with comparable strength, the connection may remain unreliable despite a high AP setting.
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When a power adjustment is worth testing
- The affected client is only marginally out of range and the rest of the area is already well served.
- There is no obvious channel congestion or severe obstruction at the problem spot.
- The AP can be adjusted without creating excessive overlap with another AP.
- You can measure the result and roll back if signal, latency or stability gets worse.
When more power is unlikely to solve the problem
- A low-power client remains weak even when the AP is already transmitting strongly.
- The issue occurs through several walls or across floors where repositioning or another AP would shorten the path.
- Clients show strong signal but poor throughput or high latency, indicating interference or channel utilization rather than simple coverage loss.
- The installation is dense and additional overlap would make co-channel interference worse.
Auto versus manual settings
Meraki supports automatic and manual transmit-power settings and advises leaving the setting on Auto when you are unsure. If you choose manual control, change one AP or radio at a time, record the original value and test the same client locations before making another change. The Manual Channel Selection, Transmit Power Adjustment, and Antenna Configuration documentation was last updated December 16, 2025; controller labels and automation behavior can change, so confirm the controls in the current version of your WLAN platform.
When adding another access point is the better fix
If the client’s signal remains low despite high transmission power, Ubiquiti’s troubleshooting guidance recommends moving the client closer or adding an AP. A second AP reduces the distance and obstacles that each client must traverse, which addresses the two-way limitation that a power increase cannot.
An additional AP is also the logical response when the building has a persistent dead zone, when several clients in the same area fail, or when one AP is serving too many separated rooms. The AP must be compatible with your network and have an appropriate backhaul; a wired connection is generally the most predictable way to place it, while any wireless backhaul consumes the same RF environment you are trying to improve.
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Adding hardware is not a guarantee by itself. Placement, antenna pattern, channel selection and power levels determine whether the new cell improves service or simply adds interference. Treat the installation as an RF design exercise and verify it in the real building.
Compare the two options against the actual fault
| Decision factor | Increase AP transmit power | Add another access point |
|---|---|---|
| Primary problem addressed | Marginal coverage from an existing AP, when the client can still communicate reliably. | Persistent weak coverage caused by distance, walls, floors or a separated area. |
| Client limitation | Does not increase the client’s own transmit capability. | Shortens the client-to-AP path, helping both directions of the link. |
| Interference risk | Higher power can enlarge overlap and raise co-channel interference. | Another radio adds potential interference unless channels and power are planned. |
| Placement work | Usually no physical move, but the existing AP’s location still limits the result. | Requires a measured location with suitable coverage overlap and backhaul. |
| Best evidence for choosing it | Signal is slightly weak, neighboring-channel conditions are acceptable, and a controlled test improves the client measurement. | Signal remains low at the problem spot despite high AP power, or multiple clients share the same dead zone. |
| Validation required | Recheck signal, noise/interference and application performance at the original locations. | Recheck both AP cells, roaming behavior, channel utilization and the original dead zone. |
Plan a second AP so it helps instead of competing
Choose the physical position from measurements
Do not place the second unit at the far edge of the first AP’s usable area simply because a drawing suggests two circles will meet there. Measure from likely mounting points and account for the actual walls, furniture and floor construction. The goal is enough overlap for a client to move between cells without losing service, but not unnecessary overlap that makes neighboring APs hear one another too strongly.
Assign channels deliberately
Neighboring APs should use different non-overlapping channels where possible. Cisco Meraki’s Channel Planning Best Practices and Channel Planning Overview explain why channel reuse and channel width affect contention. A second AP on the same channel as a nearby AP can increase channel utilization even when the client’s signal appears strong.
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Match power to the density of the deployment
Maximum power everywhere is not a universal best practice. In a dense installation, reducing power can limit cell size and co-channel interference, while a sparse layout may tolerate a higher setting. Set power and channel assignments together; changing only one can hide the cause of a problem or create a new one.
Keep the backhaul and configuration consistent
Confirm that the new AP can reach the LAN or controller from its intended location and that its security, network assignment and firmware policy match the existing WLAN. The source material does not establish a specific model, price or performance result, so compatibility and measured placement—not a product name—should drive the choice.
A measured decision process
- Map the symptom. Walk the affected area with the actual client devices. Mark where signal or application performance changes and whether the issue affects one client or many.
- Capture a baseline. Record the client signal and observed interference or channel utilization at each marked location. Note the AP, channel and power setting serving the client.
- Inspect physical and RF conditions. Check AP placement, antenna orientation, obstructions and nearby networks. A strong signal with poor performance points you toward congestion rather than simple range.
- Run one controlled power test. In the WLAN controller’s radio settings, adjust transmit power modestly or allow the platform’s Auto setting to manage it. Change one variable, test the same locations and compare with the baseline.
- Undo an ineffective change. If the client remains weak, performance falls, or neighboring APs interfere more, restore the previous setting rather than stacking additional power changes.
- Decide whether coverage still needs another cell. If several clients remain weak or the client signal is low despite high AP power, plan an additional AP and a suitable backhaul.
- Install and channel-plan the new AP. Use a measured position, provide enough overlap for roaming, select different non-overlapping channels where possible and set power with the surrounding APs in mind.
- Validate after installation. Repeat the original walk, test the same clients and check signal, interference, channel utilization, roaming and the applications that originally failed.
Troubleshooting branches after the change
Only one phone or laptop is unreliable
Test another client in the same spot. If other devices work, inspect the affected device’s orientation, antenna behavior, driver or power-saving state before changing AP power. Moving the client closer is a useful control test; if that immediately resolves the problem, the client’s link margin is likely the limiting factor.
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Every client is weak in one room
Measure the room and the path to the AP. If the weak area persists after a controlled power test, relocate the existing AP or add another one rather than assuming the AP can overcome the obstruction by transmitting harder.
Signal looks strong, but latency or throughput is poor
Investigate channel utilization and competing transmitters. More power can make the signal indicator look better while increasing the number of APs and clients that contend for the same channel. Review channel assignments and neighboring-cell overlap using the planning guidance from Meraki.
The new AP makes roaming or performance worse
Check whether the cells overlap excessively, whether both APs use the same channel, and whether power is too high for the density. Move the AP based on measurements or reduce power to limit self-interference, then repeat the walk test.
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The AP setting is already at maximum
Do not treat the maximum value as proof that the design is correct. The client may still be unable to transmit back, and the RF environment may be congested. A measured second AP, better placement or a revised channel plan addresses those conditions more directly.
What the vendor guidance does—and does not—prove
The official documentation supports a measurement-first decision, controlled power changes, and additional APs when weak client signal persists. It does not provide a universal signal threshold, a guaranteed coverage radius, a performance percentage, or a model-specific recommendation. Results depend on the client, building, antenna pattern, channel conditions and AP placement.
For reference, the key guidance is Cisco Meraki’s explanation of how transmit power affects coverage and maximum achievable signal-to-noise ratio (Transmit Power and Antenna Configuration), its channel-planning documentation, and Ubiquiti’s Optimizing WiFi Connectivity and Reducing Latency and WiFi Troubleshooting Guide. These are manufacturer recommendations, not a substitute for measuring your own RF environment, and some pages do not expose a publication or update date.
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