Questions on the implementation of Wi-Fi (802.11) hardware. Note shopping questions are off-topic.

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2answers
15 views

What kind of metal are RF shields made of?

With the shields typically found on WiFi modules, what kind of metal are they? Are they coated? Here's an example: Thanks
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2answers
49 views

Could the metal shield on radio modules be tampered with?

I see that most radio modules have a metal shield. Is it for keeping the radio waves inside? If so, could a shield be too thick for its purpose? For instance, if one solders another piece of metal ...
3
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1answer
75 views

Must FCC-certified modules be labelled with the correct FCC ID?

The manufacturer of this radio module I bought claims that it's FCC certified, but there's no FCC ID on it (though there is the FCC logo). If the final product is to be FCC tested, would it then be ...
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0answers
10 views

BlueGiga WF111: SDIO host interface and SPI compatibility

I am planning to use the following in a project: Olimex A20-SOM-4GB (Allwinner A20 SoM) BlueGiga WF111 Wifi b/g/n module The WF111 module has only one host interface, which is SDIO (1-bit by ...
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0answers
27 views

Impedance matching circuit for ESP8266

The datasheet of ESP8266 says that the impedance matching circuit should be 50 ohms. The ESP-01 uses a L-C-L filter. The value of capacitor is 5.6 pF. What should the value of the inductors be? How do ...
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0answers
25 views

How would I mount WiFi antennas inside this small PC? [migrated]

I am making a small PC and internal antennas would be preferable. I see devices like Intel NUC and Gigabyte BRIX miniature PCs which have effective internal antennas. Basically, what type of antenna ...
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2answers
80 views

TCP/IP stack for wifi module

I keep reading about TCP/IP stack for wifi module. I am having bit difficulty to understand that. I am working on hobby project in IoT and need to choose wifi module for Atmega328P. I heard about ...
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0answers
33 views

Indoor Positioning System [migrated]

We are developing an indoor positioning system. And for locating the indoor position we are using Wi-Fi, as we know GPS does not work properly inside a building so it was ruled out. As I was going ...
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2answers
41 views

Antenna mounting question

Here is the datasheet and drawing of the antenna on this link I need to stick out the antenna from a thick metal enclosure, how much of the antenna should stick out? Is it 19 mm (the black rubber ...
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0answers
69 views

How to connect Xbee to FPGA using SPI?

I am trying to connect an Xbee to a FPGA using SPI. I found some code online to read in the MISO and convert to an 8bit output register. I have it working in the simulation but I cannot get the ...
1
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1answer
120 views

ESP8266 Wifi Module - prints “ready” but not responding to AT commands

Just received my first ESP8266 wifi module with some excitement. However I've been unable to fully communicate with it. I have connected the module to my computer via a usb to serial cable and I'm ...
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1answer
18 views

connecting wifi module to proxy based wifi

I have a wifi module with micro-controller , but my college wifi uses proxy, SO how can I program proxy credentials in my C program so that my wifi module connected to micro-controller can connect to ...
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0answers
37 views

Bluetooth LE versus WiFi latency?

How do the best case and typical latency times differ between using WiFi and Bluetooth LE to communicate quickly between two nearby devices capable of using either of these 2 standard wireless ...
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0answers
37 views

Converting USB webcam to wireless

I have a PC workstation and a usb camera installed about 5m away. There is power available at the camera but the USB port is now broken. It is prohibitively expensive to replace as it is installed ...
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1answer
59 views

how to make an amplifier system to boost my wifi over large distance? [closed]

I am keen to know if I can build a amplifier system which would take my wifi signal as input and boost it over large distance. I know wifi repeaters are out there but I am looking for more powerful ...
0
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1answer
59 views

wifi / WIMAX antenna

What the different between WiFi antenna and WIMAX 4G antenna?, I want to boost the signal for my router to 4 km, I found this antenna in local store, but it seems weird there is only 1 leg, not like ...
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2answers
51 views

Circuit board layout: wifi ceramic antenna next to a electromechanical relay

Is it okay to place a small ceramic antenna not far from a electromechanical relay? Would the magnetic field generated by the relay coil (when on) affect wifi operation? clarifying edit: not far = ~1 ...
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0answers
23 views

IEEE 802.15.4 standerd

According to Wikipedia the said standard defines physical layer and media access control (MAC) control for devices working in the Sub-1 range. However I noted that this standard is not similar to ...
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0answers
29 views

HF RFID 13.56MHz Interference from WiFi/BLE 2.45GHz?

If a Wifi/BLE antenna were placed within a multicoil loop antenna for 13.56MHz HF RFID, would there be significant crosstalk/interference?
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1answer
104 views

How to connect FPGA to Xbee? [closed]

How can I connect an Xbee to FPGA to transmit data.
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2answers
110 views

Why do wifi channels overlap?

In the United States and Canada there are 11 channels available for use in the 802.11b 2.4GHz WiFi Frequency range defined by the IEEE. But there are only 3 non-overlapping channels available in the ...
0
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1answer
31 views

Wifi Channel vs a Sub 1 GHz channel of same width

If the same channel-width is allocated for a WiFi channel and also for a Sub-1 GHz channel, would the maximum allowable speed be the same for both channels theoretically? If they differ, what is the ...
0
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1answer
81 views

RSSI measurements near wifi router

I have a question about RSSI and EIRP. When I bring my smartphone very near my antenna wifi router (+20 dBm EIRP) the analyzer wifi application shows me an RSSI level about -20 to -25 dBm (a negative ...
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1answer
80 views

How to find out Packet Loss in a Broadcasting environment

Indeed packet loss is an important metric to use when comparing different communication protocols. To me it is understandable how one would computer Packet Loss in a unicast transmission. Simply the ...
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1answer
60 views

Best MCU platform with over-the-air firmware flashing capability? [closed]

I know spark.io is well known for this feature, but I'm searching for alternatives that offer hassle-free over-the-air firmware patching and has also some open implementation examples available. ...
1
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1answer
76 views

hlk-m30 WebClient example

I have started working on HLK-m30 WiFi module. I am developing the simple client on the module using simple AT commands. I have Opened socket TCP client and then Write data using the command. ...
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0answers
25 views

802.11 Channel Use Regs

With a 5.8Ghz WLAN device, operating in the upper UNIII band, 5745mhz-5825mhz... ...is it required that if the device is using a standard 20mhz wide 802.11 channel, that you can ONLY be centered on ...
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2answers
138 views

What chips do 3$ wifi dongles use? [closed]

I saw lots of WiFi dongles withing the price range from $2,50 to $3,50 (eg. this one). I am current doind a project using a microcontroller with usb, that requires WiFi. I'm interested what kind of ...
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1answer
69 views

Simple Serial-to Wifi communication

I'm working on controlling an incubator by writing commands to its serial port, a 9 pin RS232. The commands are simple byte strings, such as #02ts. The incubator responses are similar to the ...
0
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0answers
71 views

If my WIFI chip has poor performance at 5GHZ, what does that mean to the end user?

I'm testing my WIFI chip, and it has poor performance at 5GHZ. The transmit power I'm measuring is really low. How does this problem manifest to an end user? Will the internet connection be really ...
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1answer
65 views

using supermalloy as the core for wifi loop antenna

this is an extension of this question: Why aren't ferrite rod antennas used in WiFi? if you don't want to go through the previous question, then basically i was asking if we can loop wifi ...
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2answers
2k views

Why aren't ferrite rod antennas used in WiFi?

Does it have something to do with soft ferrite's low coercivity, still not low enough at gigahertz frequencies? See, I'm putting together high gain receiver antennas and transmitter antennas. Space ...
0
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1answer
79 views

Why can current phones act as Wi-Fi routers, but not as mobile broadband (3G, 4G etc.) routers? [closed]

Many of today's smartphones enable users to share their own internet connection with others via Wi-Fi through tethering. However, from what I understand, current Wi-Fi has much shorter range and ...
0
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1answer
161 views

ESP8266 serial-wifi: antenna options

The cheap ESP8266 boards are offered on ebay with two built-in antenna options: with a PCB trace antenna with a ceramic(?) antenna (PCB photographs see below.) Has somebody bought both and ...
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2answers
96 views

How can the 2.4GHz ISM band have 130+ channels?

I am a relative beginner regarding wireless communications protocols and I am looking into the protocols used by toy helicopters, in particular the Hubsan X4. According to more experienced people who ...
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2answers
182 views

Using adafruit Flora or Adafruit Trinket + MPU-6050 3-Axis Gyroscope + nRF24L01+ together

I am trying to do a project where I need to transmit data from an object if the object is moved in a particular way. The restriction is that the device has to be as thin and small as possible. I am ...
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0answers
36 views

Any parameter other than RSSI in latest wifi standards, which can help estimate distance between wifi AP and endpoint

I have checked and found many references for measuring distance between wifi AP and connected endpoint based on RSSI. But in order to do this, does latest wireless standards produce any parameters ...
0
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1answer
39 views

Access the internal clock on WLAN chips

I am trying to implement a localization method based on WLAN round trip time (RTT) ranging. Some of the papers I have read suggest doing ranging based on the MAC layer RTTs (beacons, ACK, RTS/CTS ...
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4answers
107 views

Will having two antennae at the receiver give better reception?

I have a 300mbps router with two antennae (tp-link td-wd8968). I'm building a PC and looking for a wireless network card. I have seen seen cards with a single antenna (150mbps) and cards with two ...
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1answer
46 views

How choose MPU for image streaming and transmission

I want to ask how to choose and how much processing power are required to be able to stream video using a wifi module. I'll explain better; I have a camera sensor of 5Mpx, i want to elaborate video ...
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0answers
59 views

Bluetooth antenna design

I am building a system with bluetooth/wifi/GSM. Since I am an RF noob, I have some questions regarding antennas. Some modules come with loop antenna and if you want to create your own PCB there is a ...
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0answers
62 views

Compare EMF Strength

My mother is extremely sensitive to EMFs (Electromagnetic Hypersensitivity), and I want to help her by turning off Wi-Fi in the house and using some Powerline adapters to replace the Wi-Fi network. ...
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1answer
54 views

Power output needed to go through a car

I need to know the power output needed for transmitter if I want that receiver catch this signal? In details, there is a tunnel 4 by 4 meters and a cars in it, cars have a receiver inside and ...
0
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2answers
85 views

Miniaturizing home automation help? [Novice]

Right now I am doing a home automation project and I want to create two things. The first is a device that looks like this but has the capability to also be controlled over wifi using Arduino. I know ...
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0answers
57 views

Controlling a wifi outlet with sensor parameters

I currently have a wireless temp sensor that I can monitor via phone or computer, however I'd like to connect this sensor to a wifi outlet that turns on an a/c or heater. In order to prevent internet ...
0
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2answers
100 views

What's an easy approach to provide Wi-Fi/Webserver to mobile phone apps without hotspot

I'm a software programmer and I'm up to start a project of an embedded outdoor device which I will be able to control by any mobile phone. My preferred approach is having the embedded device provide ...
0
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1answer
42 views

WiFi card without host device

So to start I wasn't quite sure about where this question should be asked, so feel fre to relocate it if you want. I'm setting up a system to notify me when a user enters an area. My plan is to use ...
2
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2answers
719 views

Connecting external 2.4GHz antenna to Intel Edison

I would like to connect an external 2.4GHz antenna to an Intel Edison. According to Mouser, there are different Edison part numbers for different antenna configurations (internal or external). ...
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0answers
54 views

How is 802.11 (Wifi) received signal strength (RSS) measured and reported to software?

I have looked around for a while now to find an answer to this question, but answers I find do not fully answer my question. I found this response interesting from another question on this site. ...
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1answer
105 views

ZigBee vs WiFi for wireless communication

I've been working on a product using WiFi. The reason I picked WiFi, is cause I essentially have 20-30 nodes communicating to a main node via a router. This all works very well, and its easy as its ...