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here’s why it happens and how to fix it

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You may have ever asked yourself a question when you have restarted your router or if you use a repeater that supports both 2.4 GHz and 5 GHz networks. Why does 5GHz take longer to become operational while 2.4GHz works sooner?.

It is a problem that you will experience especially if you use a repeater, since in the case of the router you will only notice it when you turn it off and on again, something that is not usual since we almost always have the router on. However, it can happen to you and now we are going to see what is the cause of this behavior.

It’s about not causing interference

And first of all, we have to clarify that no, that the router or the repeater are not broken and that this is normal operation in the case of devices that have support for the 2.4 and 5 GHz network.

And the first thing we are going to see are the differences that exist between both types of networks. 2.4GHz Wi-Fi network is usually the one with the most interference And in a house where we can be surrounded by dozens of these networks, we can run into more interference that slows down the network.

Besides, 2.4 GHz network has fewer channelswhich favors congestion by having all the connected devices to operate in a smaller space as well as lower connection speeds that are usually 50 or 60 Mbps maximum.

For 2.4 GHz, we are talking about 14 channels, separated by 5 MHz. Of course, each country and geographical area applies its own restrictions to the number of channels available. For example, in North America only the first 11 are used, while in Europe we have 13

For its part, the 5 GHz Wi-Fi network, being less used, has less interference, although compared to 2.4 GHz, it has less range. Besides has more channels so that devices have more space in which to spread out, so that it offers better performance and offers greater speeds close to 867 Mbpswhich makes it perfect for high-speed fiber connections.

Wi-Fi 2.4GHz

Wi-Fi 5GHz

Maximum speed

Less connection speed

More connection speed


14 channels


25 channels


IEEE 802.11b, 802.11g, 802.11n (B, G, and N)

IEEE 802.11a, 802.11n, 802.11ac (A, N, AC)


More coverage at home

Less coverage at home


More interference with other networks

Less interference with other networks

We have already seen the differences and now it is time to see the reason that makes the 5 GHz network take longer to be operational in our router or repeater. Y the key is the use of the DFS functionan acronym for (Dynamic Frequency Selection) or dynamic frequency selection and the channel used.


This is a function related to Wi-Fi frequencies in the 5 GHz band and its channels. What the DFS function does is increase the number of Wi-Fi channels and for this a prior process of channel availability check to avoid interference. The reason is not to interfere with satellite communication and military or weather radars.

Which WiFi network is better to use in each case: 2.4 GHz vs 5 GHz

When you start the router or repeater, the DFS function is enabled so that the router detects the channel status and determines whether to use the DFS channel or the non-DFS channel during boot. In the event that the router determines not to use the DFS channel, the 5 GHz band is activated immediately, but if the channel used is DFS, a verification process must be passed during which the 5GHz signal will not be available for connection.

In the case of the 5 GHz band, there are a number of DFS channels and others that are not. These last ones are the channels 36, 40, 44 and also 48. The rest of all the channels of the 5 GHz band make use of the DFS function to avoid interference.


The importance of the channel used


Thus, it all depends on the configuration of the router or repeater. If it works using any of the channels that are not DFS, the connection with the 5 GHz band will be immediate, while if we use the scanning system to avoid causing interference, the process can take up to 10 minutes.

In this way, see the channel our router is using for Wi-Fi it’s pretty straight forward. It is enough to enter the router from the browser of a connected device, usually using the address or

How to change the channel of your WiFi to improve its signal and gain power

In this section, each router can present a different interface, although the search terms are usually very similar. You should find the section for Wi-Fi or WLAN settings and notice that the 2.4 GHz network and the 5 GHz network will appear separately.

Manual selection mode for channel 36 without DFS

Manual selection mode for channel 36 without DFS

The most common is that the automatic mode is selected, by which the router itself analyzes the nearby devices and selects the channel it sees as the most appropriate. In this case, it is normal to indicate which channel has been chosen. If the channel is chosen manually, then you will see it in the settings itself.


Automatic selection mode for channel 64 with DFS

In my case, for example, it is automatic in the Jazztel WiFi 6 router, in which it assigns the channel 11 to the 2.4 GHz band and channel 116, one of the high ones, to the 5 GHz.


Remember therefore that only channels 36, 40, 44 and 48 are non-DFS channels and these are the ones you should use by setting the channel selection of the router in manual mode and not in automatic. The rest of the channels are DFS, so to avoid interference with airport, defense and meteorology radars, they will make a preliminary check that causes the router to take longer to offer it.

If it detects your signal you are forced to leave the channel and automatically select another. The norm obliges you to remain on the channel for 60 seconds, making sure that you do not receive signals before starting to broadcast and, if you notice signals, start on another channel, another 60-second process and so on until you find a free one.


Some models of routers have the Zero-Wait DFS function what it does is create a kind of bag of interference-free DFS channels to switch to one of these in case of need and thus not cause waits. A system that makes the router constantly analyze the available channels.

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Smart Home

what they are, types, advantages, disadvantages and models from 180 euros

Avatar of Thomas Grimm



at the time of produce our own electricity at home Typically, we think of photovoltaic solar panels or panels, a technology that takes advantage of the sunlight to feed our equipment and appliances with a relatively high initial cost if we want great power.

However, there is another option that is gaining more and more strength, especially if we have a single-family home, with a clear roof, garage, large terrace or with a small patio or garden at our disposal: domestic wind turbines. (more…)

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Smart Home

in which cases it is essential to bet on a top-of-the-range robot vacuum cleaner and in which not

Avatar of Thomas Grimm



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Let’s go ahead that today the intelligent navigation essential for mapping has been democratized, so that we can find it not only in the high and medium range, but also in moderately affordable robot vacuum cleaners (even under 200 euros). But either by investing the minimum essential in this autonomous broom substitute or because we do not want a robot vacuum cleaner to draw maps of our house under any circumstances, there are those who choose to do without this feature. Buy a robot vacuum cleaner with or without mapping?

why map

Lets start by the beginning. Mapping consists of the fact that the device has the Technologys that allow it to deduce what the environment will be like to sketch a map. The direct consequence is that you can draw meaningful navigation paths (the logical thing to do is to sweep by rooms, not start sweeping part of the kitchen, leave it halfway and go with the living room), so you make sure that covers the entire* area with just enough passes.

And that asterisk in “everything”? The reality is that there are obstacles such as cables, pots, feeders, legs and cracks that the vacuum cleaner does not pass through, either because it is physically impossible for it to fit or because its algorithm determines that it does not fit (generally when it has little clearance).

That it does not go too far is important, firstly because it optimizes its operation and the long useful life of its components, secondly because thanks to not wasting resources, it can cover and clean more space. Finally, because if you are at home, listening to the robot vacuum cleaner in full action is a drag. Better clean up as soon as possible.

The normal thing with a robot that maps is that you can view the map in the app and that also brings benefits. Thus, there are quite a few models that offer a color graph that distinguishes the areas that have been cleaned from those that have not, ideal for you to take note and remove some elements that make navigation difficult.

But the great advantage of mapping has to do with partial cleanings. Yes, you can resort to the classic and ancient virtual barrier (an element that simulates a virtual limit for the device) or proceed to the bravest taking the vacuum cleaner in your arms, drop it in a room and close the door to clean, but if your kitchen is dirty after preparing food or your bathroom has turned into a post-apocalyptic place after your child has showered and cleaned up, the ideal is to go to the phone, open the application, select which area or room you want it to clean and let the action begin. In a few minutes and without further need for your intervention, the floor of the area would be clean again.

In any case, if a robot maps it is because it has some kind of intelligent navigation system that will help you move better than without it, allowing for more effective cleaning, minimizing the chance of getting lost and also getting stuck around. That he does not clean a part of the house is a problem, that he pulls the cord of the lamp, throws it on the floor and breaks it is a chore.

Not related to mapping, but to note: models without mapping are entry-levelwhich generally implies more rudimentary handling (perhaps manual and remote controlled) and basic cleaning Technologys (don’t expect special rubber center rollers for pets).

Best price-quality robot vacuum cleaners: which one to buy based on use and six recommended models


How robot vacuum cleaners navigate

The state of the art of robot vacuum navigation. As we anticipated in the intro, nowadays finding smart mapping and navigation is not only unusual, but the exception are models that do not map. But there are mappings and mappings.

The highest range of robot vacuum cleaners is mostly taken over by models with a multi-navigation system with a laser sight and a front camera which, in addition to allowing maps, serve to recognize objects. Map and objects usually appear in the application, so that we know what problematic things are on our floor. Under the hood, a processor, algorithms and even artificial intelligence to make decisions: ignore it and try to go over it or avoid it.

This is essential because that way you can avoid what was Worst cleaning day of my life: that fateful date when Lola felt unwell, she planted a pine tree in the corridor, the Roomba ran over it while cleaning and you can imagine the rest. Cleaning the floor of the house of excrement is not a pleasant dish, but having to disassemble your vacuum cleaner and waste time removing splinters… for me it stays.


The Roborock S7 MaxV Ultra has it “everything”: laser sight and front camera

Then there are models that they either just have a laser sight or a camera (although iRobot bets only on a camera placed on the front for mapping, navigation and recognition of objects in models like the Roomba J7 +). These models are more than enough for domestic mapping and optimized navigation, although to avoid accidents and loss it is best to leave the house as clear as possible.

And we close with the non-mapping. These robot vacuum cleaners have a combination of mechanical pressure sensors to detect contact with walls, infrared sensors to measure the distance to obstacles, optical sensors similar to those of mice to analyze movement, and fall-prevention light sensors that detect steps and unevenness. How do they navigate? Like you would if you were blindfolded and released into a room: with moderate caution and touching everything. The bonus is that they must also try to cover the entire area, so navigating randomly means taking a few more detours and turns.

Do I map yes or do I map no?

The good thing about robot vacuum cleaners is that they clean moderately well for you, which depends on their suction capacity, the quality of their brushes, that they are capable of covering the maximum space in your house and that they have a battery to do so.

Are you concerned about privacy? Here are two recommendations: see how the manufacturer manages this data related to our architecture and its objects (essentially, if they stay on the device or if they go to a server, if there is data encryption) and the premise that Although on paper there are protection systems, logically there is always some risk. The second is to weigh this fear against what you earn.

Screenshot 2023 01 29 At 13 24 09

Roborock S7 MaxV application interface

When is it essential to have mapping? If you have a large house and/or with several floors, you want to do partial cleaning or you simply expect the best results from a vacuum cleaner, then your thing is to bet on efficient navigation. No matter how much battery a robot with random navigation has, it is highly difficult for it to clean a large floor well and it is not so much a question of size as of obstacles: it can already have autonomy of 300 minutes, which if it gets stuck at minute 7, it will not be able. Another thing is that you have a completely clear ship.

Ok, but I still want to spend as little as possible, Is a robot vacuum cleaner without mapping worth it? Obviously having a robot vacuum cleaner is better than nothing and its effectiveness can be acceptable if we are clear about its limitations. In any case, it can be a good option if your budget is just over 100 euros, you have a small and/or sparsely furnished house that you agree to leave uncluttered, or you simply want an extremely basic model without connectivity (an example : to give it to your grandmother and she can control it with a remote).


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Smart Home

the first approach to the big screen

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After decades of making use of cathode ray tube televisions, several manufacturers began to launch televisions on the market that were considerably thinner and with a novel panel technology. We are talking about plasma televisions, which ended up revolutionizing the industry. It must also be said that there was such a powerful marketing campaign around this new technology that even today you can find people thinking that they are still the ones that offer the best image quality.

And it is that the manufacturers of TVs made sure that when someone talked about plasma TVs, they were talking about a product synonymous with quality and high-end. For a while it was like that because the evolution compared to the old CRT was considerable. In this article we wanted to pay tribute to this type of television, mentioning its origins, what its technology consisted of, and its successors.

It took decades to see the first plasma television

Although the plasma display was developed in the 1960s for the PLATO (Programmed Logic for Automated Teaching Operations) computer system by a group of researchers from the University of Illinois, it was not until the late 1990s that to commercialize televisions with this technology. During all that time there were monochrome screens (orange, green or yellow), very popular for their hardness and because they detached from elements such as memory or circuits to update the image.

Image: Wikipedia

In 1973, IBM developed an 11-inch monochrome display with this technology, accompanying the IBM 3270 computer and making it capable of displaying up to four terminal sessions at once.

The Plasmaco company, founded in 1983, also played an essential role in the development of this technology. In fact, it was acquired in 1996 by Matsushita Electric Industrial, who in 1983 launched the Executive Partner, its first computer with plasma screen. The latter is known today as Panasonic, one of the companies that has most promoted plasma technology.

2023 is going to be a spectacular year in televisions: this is what the main manufacturers are preparing

When Pioneer launched the first plasma television to the public in 1997, the technology began to catch on in a big way, promising larger screens and better image quality and brightness.

Much larger panels with higher image quality

The plasma television has a set of small cells located between two glass panels. These contain a mixture of noble gases (neon, argon and xenon) that after charging the electrodes creates a voltage difference between the rear and front, causing the gas to become ionized and change its state to plasma. After this process, the ions of the gas move towards the electrodes, where they collide and generate photons, thus causing the emission of light.


Image: LCD Repair

This technology allowed to manufacture televisions with much more brightness than tube TVs. In addition, they were popular given their larger size, since in the market we could find plasma televisions larger than 70 inches.


In terms of image quality, it was an incredibly noticeable leap, with a greater color gamut and deeper blacks than LCDs, given its low luminescence. However, they were televisions that got too hot, being unpleasant for the user in the case of spending long hours with the television on. In fact, as with OLEDs, in plasma televisions there was also the fear of burning the panel.


In the market we could find all kinds of plasma models of different sizes. Manufacturers such as Pioneer, Panasonic, LG, or Samsung, among many others, showed the world the capabilities of this technology in televisions, which became very popular, although yes, significantly more expensive than CRT TVs.

The price and its stagnation buried this technology

The price disadvantage, and the need for the panel to have a large diagonal for its manufacture, meant that the plasma television became part of a highly concentrated market. Secondly, LCD technology kept growing. And it is that although the first LCD televisions were notably inferior to plasma, little by little they were conquering the public, eventually tackling the problems of dead pixels or ghosting of the first generations.

During the last years of life, the plasma barely reached 5% of the market sharein a context in which brands such as Samsung or LG dominated the market for flat screens with LCD technology.

In 2014, most plasma TV manufacturers finally abandoned the technology, although it ceased to be relevant several years earlier. However, it will always be remembered as one of the Technologys that most helped advance the image quality of televisions.

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