WiFi Lab C

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WiFi Lab C

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2022 Question Marathon Thread for WiFi Lab C.

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Re: WiFi Lab C

Post by RasmitDevkota »

Well, let's get this started with something simple and essential then: what are the two most commonly-used frequency bands for WiFi communications, in gigahertz?
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Re: WiFi Lab C

Post by Nydauron »

RasmitDevkota wrote: September 19th, 2021, 9:12 am Well, let's get this started with something simple and essential then: what are the two most commonly-used frequency bands for WiFi communications, in gigahertz?
2.4 and 5 GHz
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Re: WiFi Lab C

Post by RasmitDevkota »

Nydauron wrote: September 21st, 2021, 10:58 am
RasmitDevkota wrote: September 19th, 2021, 9:12 am Well, let's get this started with something simple and essential then: what are the two most commonly-used frequency bands for WiFi communications, in gigahertz?
2.4 and 5 GHz
Yep :)
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Re: WiFi Lab C

Post by Nydauron »

My turn then!

I have 2 access points to keep signal strength strong throughout my apartment. However, I am hitting some deadspots when I am between the access points. However, when I remove one of them, no packets get lost. What is likely to be the cause?
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Re: WiFi Lab C

Post by melaniaaachen »

Nydauron wrote: September 21st, 2021, 10:58 am
RasmitDevkota wrote: September 19th, 2021, 9:12 am Well, let's get this started with something simple and essential then: what are the two most commonly-used frequency bands for WiFi communications, in gigahertz?
2.4 and 5 GHz
Ahaha :D I recently bought a router and already knew the answer to this question.
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Re: WiFi Lab C

Post by RasmitDevkota »

Nydauron wrote: September 21st, 2021, 3:39 pm My turn then!

I have 2 access points to keep signal strength strong throughout my apartment. However, I am hitting some deadspots when I am between the access points. However, when I remove one of them, no packets get lost. What is likely to be the cause?
Interference between the two access points causing information to get lost in certain locations where they destructively coincide?
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Re: WiFi Lab C

Post by Nydauron »

RasmitDevkota wrote: November 5th, 2021, 9:50 am
Interference between the two access points causing information to get lost in certain locations where they destructively coincide?
At a low level, yes, this is exactly what's happening.
What I was sorta looking for is that the access points were on the same channels. Even though we say 2.4 and 5GHz are the frequencies for wifi, it is still pretty generic since the FCC usually allocates a range of frequencies for certain technologies. Disregarding location, for the main types of wifi, there are 14 channels for 2.4GHz (of 5MHz width) and about 70 channels for 5GHz (ranging from 10-80Mhz wide).
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Re: WiFi Lab C

Post by RasmitDevkota »

Nydauron wrote: November 8th, 2021, 2:21 pm
RasmitDevkota wrote: November 5th, 2021, 9:50 am
Interference between the two access points causing information to get lost in certain locations where they destructively coincide?
At a low level, yes, this is exactly what's happening.
What I was sorta looking for is that the access points were on the same channels. Even though we say 2.4 and 5GHz are the frequencies for wifi, it is still pretty generic since the FCC usually allocates a range of frequencies for certain technologies. Disregarding location, for the main types of wifi, there are 14 channels for 2.4GHz (of 5MHz width) and about 70 channels for 5GHz (ranging from 10-80Mhz wide).
I was thinking more in general since interference happens regardless of the wave properties.
Onto the next question then: You noticed your neighbor has recently installed a half-wave dipole antenna on their roof. Being the curious antenna geek you are, you sneakily climb onto their roof with a plastic ruler and measure the dipole to have a total length of 3.1 meters. (a) What frequency does this correspond to in hertz and (b) what bandwidth designation (HF, UHF, VHF, etc.) would this fall into?
Last edited by RasmitDevkota on November 20th, 2021, 3:57 pm, edited 1 time in total.
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Re: WiFi Lab C

Post by ThomasL »

(a) 48 MHz (half-wave dipole antenna has length 1/2 the wavelength, and frequency is speed of light divided by wavelength)
(b) VHF (which is 30 MHz - 300 MHz)
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