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Questions tagged [wireless]

Using other than a wired connection to transfer signals or power. Includes optical and (ultra)sound, but most often refers to RF (radio-frequent). Distances can be as low as centimeters (e.g. RFID), there's no upper limit.

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30 views

Converting wireless controller to wired one

I bought one controller (PS3 QuickAct) from flea market guessing that it is bluetooth one, but turns out it requires USB receiver. I opened the controller and it have an transmitter module attached ...
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0answers
9 views

NB-IoT/CAT-M1: Llimitation to the actively connected devices

For the new Cellular IoT technologies NB-IoT and CAT-M1, is there a limitation to the number of modems that can be connected to the base station at one time? I tried searching for this but I couldn't ...
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1answer
69 views

Converting wireless mouse

I saw this question in one of the electronics sites, and many answered him that converting wireless mouse will zap the PC (USB ports) . The question was:(( I am trying to convert a wireless mouse to a ...
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0answers
39 views

Stm32 HC-05 bluetooth AT commands not working [closed]

I'm trying to connect bluetooth module HC-05 to stm32f103c8t6 board via usart. And first of all I've tried to change the device name, but without any success. The module RX output paired with PA9 ...
0
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1answer
35 views

What are the factors that affect delay/latency between base stations?

I am modelling a 5G network, with the uplink and downlink being decoupled and treated as separate networks. I am exploring the integration of fog computing and how latency varies between different ...
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1answer
62 views

Wireless phone chargers in a lab environment? [closed]

We are talking about devices that are designed to pump out quite a bit of power in the MHz. Admittedly the chips have comms protocols so they don't spew all the time, and the resonant circuits are ...
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0answers
36 views

What is frequency splitting and how to derive it's equation

I am new to electronics and want to know what is resonance frequency splitting and how to derive the formulas to find those splitting. I am a HS student looking into wireless energy transfer and came ...
1
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1answer
47 views

Battery Power Source for Wireless Router & Modem? [closed]

I only have access to electrical power via a generator for now, and need to continue to power the wireless router & cable modem even when the generator is out for a good part of the day or night. ...
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2answers
60 views

Transmission of information in terms of information theory and protocol

I am a student studying wireless communications. First of all, I learned that In AWGN channel, i.e., y=x+n with n~N(0,sigma^2), the amount of information that can be transferred (i.e., capacity) ...
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1answer
34 views

Induction loop resistance calculation

I have been trying to build a simple induction loop amplifier. I am using TDA2040 as an output stage and it delivers 10 W (I limited it for that). I am using about 14 meters (1 mm thickness) loop. My ...
4
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2answers
84 views

What would happen if you accidentally casually put your apple watch on a wireless charger meant for phones or other higher power devices for hours? [closed]

What would happen if you accidentally, casually (because they're supposed to be so convenient!) put your apple watch on a wireless charger meant for phones or other higher power devices for hours? Or ...
2
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2answers
61 views

How does a wireless device alert the master to its presence without interfering?

My understanding is that wireless devices, such as a cell phone, must speak to a master device like a cell tower and the cell tower will then arbitrate who gets to talk and when. Maybe my ...
1
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0answers
32 views

Weighing LoRa and Xbee pro 900MHz

I created a post before about wirelessly transferring messages from sensor to gateway that would be at most 2km apart from each other. The message would go through gateway to local server. I would be ...
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0answers
32 views

Writing data into a SPI Flash using NFC?

I have a 16 Mbit SPI flash. I want to write data to the SPI flash using NFC. I know there are multiple NFC+MCU series out there that can do this. However, the NFC+MCU require JTAG, LDOs, ..etc. The ...
0
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1answer
30 views

Battery free TPMS

I am doing a report about wireless TPMS, and I heard about products where the sensors in the valves do not need batteries at all (operate and transmit the data). Is that correct?? have you encountered ...
1
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2answers
94 views

Count car weels without using visible light (camera/laser etc) and without interaction [closed]

For this project we need to count weels of a car (if possible at all), one side only. The scenario is within the following scope: The car is always passing in a straight line It is cars only, so all ...
1
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1answer
50 views

How can I install mini aluminium heatsink to wireless card?

I am thinking about increasing txpower of the my wireless card. But I am worrying about the heat can damage my wireless card. My solution is installing aliminium heatsinks on the wireless card. My ...
0
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1answer
36 views

Why doesn't 802.11 based technologies LTE need time sync?

I have been reading on 802.11p vs C-V2x, the two technologies for vehicular communications. One disadvantage for C-V2x that is frequently mentioned is that C-V2x needs all the UEs to be time-synced ...
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0answers
18 views

What is the meaning of reciprocal communication range in the context of wireless communication?

Does it mean the carrier sense range is equals to the communication range, as this paper mentions the system has no hidden terminals due to reciprocal range ?
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1answer
47 views

What are the equations/values for Rayleigh Fading, path loss and log-normal shadowing?

I am to use the following equation as part of a model for a wireless communications network: I would like to know the specific parts of the eqautions: "k" - is this the Boltzmann constant? "v" - I ...
4
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3answers
257 views

Why can't the orthogonal PN codes help in the near-far effect?

The CDMA near far problem arises because handsets may be anywhere within the particular cell boundaries. Some handsets will be close to the base station, whereas others will be much further away. In a ...
1
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1answer
71 views

Wireless or wired solution for perimeter fence security?

We are currently working on a project where we would like to place around 350 vibration sensors on our university's perimeter fence for security. The field layout is almost 1km to 1km (square - 1km^2 -...
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0answers
39 views

Passive (or very low power sensor) sensor to wirelessly receive wake signal

Context. I am using an ESP32 and a small circuit to control an electronic lock on my one of my exterior doors. It is powered by batteries. It has a door magnet sensor to detect when the door is open ...
0
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1answer
38 views

Need help with understanding the pros and cons of geometric and stochastic based channel models. Which one s preferred under which conditions?

https://www.adv-radio-sci.net/9/165/2011/ars-9-165-2011.pdf https://ieeexplore.ieee.org/document/7794648 https://pdfs.semanticscholar.org/c301/8463116117ea64f69638e15aa78fe9e84093.pdf https://www....
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0answers
27 views

Air core design

what is the appropriate air core design for inductive power transfer that is suitable for 30khz? I used 200 turns and 7 inches diameter.
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5answers
2k views

Can wireless communciation be synchronous?

I understand that in synchronous communication, the sender and receiver need a common clock. Is it possible that wireless communication be synchronous? Can some common clocking element be there for ...
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0answers
15 views

deriving an equation for wireless network capacity

I'm trying to derive an equation for wireless network capacity given topological constraints of the nodes and certain obstacles... but before I get that far, I want to understand the most simple case. ...
0
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1answer
313 views

Tesla coil troubleshooting help

I'm trying to make a Tesla coil with approximately 200 turns in the secondary coil using 28 gauge enameled copper wire. My primary coil has 3-6 turns with a thicker wire. I've made all the connections ...
0
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1answer
47 views

Vertical Farm Automation

I am building a system to automate a vertical farm (specifically watering, lighting, and drying) and am having trouble choosing between a wired or wireless system architecture. The farm is arranged ...
0
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3answers
93 views

Why does the voltage induced in the receiver coil of this WPT circuit decrease when a load is added (in parallel)?

The following is a circuit that wirelessly transfers power via inductive coupling. The circuit is supposed to power a 12 V 0.15 A DC fan and a typical smartphone, which requires 5 V DC across it. The ...
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2answers
59 views

Is wireless technology only possible due to inductance?

I asked a friend how capacitative coupling works in glass-mount antennas. He said it's like when installing a sound system; where you want to keep the power & audio cables separated, to avoid ...
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2answers
64 views

Is it possible to induce negative/positive charge wirelessly

Sorry if this question doesnt belong here. I have no clue of what I'm about to ask. I want to know, if possible, how to induce negative/positive charge on objects inside recipients? What I want to ...
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1answer
38 views

Trying to read the data from an ASK RF transmitter

I'm trying to duplicate the operation of a simple RF remote control (for some remote power outlets). In the remote control there is an unmarked 8-pin microcontroller. I've worked out which pins are ...
0
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2answers
145 views

Why aren't tethered balloons used instead of Cellphone towers? [closed]

If we use tethered balloons with wireless gateways fitted on them (let's say for Cellular or LPWAN communication), they can provide much more coverage. Why aren't they used then? While there are many ...
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1answer
38 views

Antenna polarization and antenna directivity are the same?

I'm working on an RFID project, and looking for information about the antennas that I have to use, I have the following doubt: Antenna polarization and antenna directiivity are the same? Thanks!
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1answer
62 views

how rubber keypad works [closed]

Press on the keyboard, how does he connect the circuit of this key? Two thin films, coated with conductive rubber circuit, with a thin film in the middle, with holes, used to isolate two thin films ...
0
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1answer
35 views

Wireless LAN standard

I'm taking a module on wireless design and we were told that the IEEE 802.11b standard has a band of 2.4 to 2.4835 GHz and that it is divided into 13 channels. Now, my question is, does that mean that ...
0
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1answer
92 views

Creating a wireless transmitter/receiver for off-the-shelf siren

Since I oddly enough haven't been able to find a suitable off-the-shelf product that's reasonable priced (less than 50-60 EUR/USD) and somewhat good looking with Google, I'm about to try a small ...
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2answers
40 views

Optimizing magnetic field force of a coil

For a personal project, I've done a redesign of Samy Kamkar's MagSpoof project. Basically, it is possible to use an electromagnet, h-bridge, and microcontroller to trick a magnetic card reader into ...
0
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1answer
49 views

Radio activated on/off switch

TL;DR: I want to know if there is anything, That on which when a radio frequency falls, and it turns on an LED. Basically an on off switch but controlled when radio waves hit it. What I hope to ...
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2answers
70 views

Half-duplex wireless: Is a tuned antenna more important for the transmitter or the receiver?

I intend for this to be a general/conceptual question that could apply to any wireless communication hardware, however I will use a specific example to talk about. Let's consider the nRF24L01. (...
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2answers
155 views

Name of an electronic component

Can anybody kindly tell me what this electronic component in the picture is called? I've seen this component in: Mobile phone circuit WiMax modem circuit GSM Module circuit I tried but was unable ...
0
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1answer
33 views

SAW Filter input power restriction

I have front end module (915MHz freq band) in circuit Which is having 30dBm output power. Between This FEM and antenna I have to insert filtering circuit. I came across few SAW filters from Murata, ...
0
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2answers
67 views

Can you turn two inductively coupled conductors into a transformer?

So I'm working on a school project, and to be honest. Don't know a lot about electromagnetism. I want to make a wireless charging station that could be plugged into the outlet. Of course I don't want ...
0
votes
1answer
42 views

Wifi/BT on Realtek 8723 - Is FCC, CE certification needed for Wifi if we disable Wifi and use only Bluetooth?

I'm planning on importing a generic mini pc that comes with an onboard Realtek 8723 for Wifi and Bluetooth. We will need to get it FCC, CE, IC certified before we sell it in North America/EU. Getting ...
0
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1answer
35 views

Setting Up Long Distance Unidirectional Wifi Antenna

A neighbor has graciously offered us temporary access to their wireless for basic internet access, but we are about 100 meters apart. I have a wireless NIC, but I wanted suggestions as to the setup. ...
2
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1answer
226 views

why do resonant inductive coupling circuit operate at high frequencies?

Just as the title says. Whenever I read a research paper on wireless power transfer via resonant inductive coupling the authors just mention frequencies that range in the kHz and Mhz range, but none ...
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1answer
36 views

What is the basic concept (philosophy) behind the modelling of Nakagami-m fading wireless channel

I understand that that NAKAGAMI-m probability density functions that describes the random behavior of signal in a wireless channel. But I am very confused about one thing, by what concept did these ...
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0answers
136 views

difference between ISO 14443 vs ISO 18092 and collision detection

I have been studying about contactless payment specifications and protocols and I have few questions about them. Are ISO-14443 and ISO-18092 called NFC and RFID in general terms, or are they a ...
0
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1answer
45 views

Wireless power through air [duplicate]

I know this might be far fetched. In normal everyday life, we have huge amounts of data traveling through the air in the form of electromagnetic radiation. But what if instead of transmitter data ...