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Questions tagged [radio]

Do not use this tag for Radio buttons. Radio is the transmission of signals through free space by electromagnetic radiation of a frequency significantly below that of visible light, or a device for doing the same. Radios are typically used for communication including voice, video and data. This includes Wi-fi, Bluetooth, Mobile phones, GPS, Radar, some remote control devices and near field communication devices (NFC) such as contactless smartcards.

Radio is the transmission of signals through free space by electromagnetic radiation of a frequency significantly below that of visible light, or a device for doing the same. Radios are typically used for communication including voice, video and data. This includes Wi-fi, Bluetooth, Mobile phones, GPS, Radar, some remote control devices and near field communication devices (NFC) such as contactless smartcards.

186 questions
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Using Pyserial to send a file?

I have a Raspberry Pi connected to my Macbook Pro by two radio modules. I have been successful so far in sending strings and commands from one device to the other using pyserial, however, I cannot find a way to send a text file. Like on…
user3117351
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Turn off/on cell radio on jelly bean

Is there any way to disable the cell antenna in android 4.2 and up? I need to be able to disable it from my application. My current implementation works until 4.1, using the airplane mode, but as I found out now, airplane mode can't be changed…
Cristian Holdunu
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Why would turning android phone RF on/off cause a reboot?

So I have a need to force an android phone to register/de-register itself repeatedly. I'm accomplishing this via AT commands while the phone is in modem/diag mode over a USB serial connection. I check the current registration state via +CGREG and…
Stolorg
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2FSK Sniffing RFCat with a Yardstick One

I have been banging my head against a wall working on an SDR project with RFCat. In short, I am reverse engineering a sub GHz radio protocol. I have figured out the protocol, and am able to spoof the receiver transmitting from my Yardstick One with…
herzs11
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GnuRadio w/ LimeSDR IQ Splitter Phase Shift

The following flowgraph implements an IQ splitter. My doubt lies on the complex to float block, where Real and Imag parts of the signal are splitted and given as output. Mathematically, do they represent the IN Phase and Quadrature versions of the…
andremartins4
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Texas Instruments CC2541 - How to receive data in Proprietary RF Mode?

Could anyone share a complete project example how to setup registers and receive data in proprietary RF mode? Texas Instruments published only one example - PER Test which is very difficult to understand and modify. Ideally I'd like to disable as…
Maciej Kobus
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AttributeError: 'NoneType' object has no attribute 'split' in python when I rune my code

from microbit import * import radio radio.on() radio.config(channel=8) routing_table = { 'Alice': 8, 'Bob': 10, 'Charlie': 15 } spy = 60 def forward_message(msg): source, destination, payload = msg.split(':') radio.config(channel=10) …
Muhammad MOAZ
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micro:bit Python send radio Image

micro:bit wireless radio BLE using Python I want to send over radio a member of the Image collection (Image.HEART). I know how to send strings and a custom image but not a member of the Image collection. I want receiver's message_in string to be…
Playing with GAS
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Arduino RF Receiver picking up some 433MHz signals but not others

I have an Arduino and a 433MHz receiver running the code below, using the RCSwitch Library. The code is working fine when I use a remote like the "BN-LINK ES1513-5-2 Wireless Remote". The bits/signal prints to the window and everyone is happy. But…
Nicholas Stom
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ESP8266 + 433mhz and RadioHead library

I'm trying to use an Lolin New nodeMCU v3 and a 433mhz receiver card. The code works fine if using an arduino uno and the 433mhz card, only one line needs to be changed to run it on the ESP8266. The thing is I cant get the esp8266 to receive the…
SirAleXbox
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How can I revise Python script for reading ham radio frequencies?

I found an excellent and perhaps-too-detailed posting on how to get broadcast FM Radio from a RTLSDR using Python and the rtlsdr library. https://witestlab.poly.edu/blog/capture-and-decode-fm-radio/ With a few modifications I was able to directly…
NoBugs
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Send/Capture Radio Wave signals with .NET

I have an idea that came to mind out of necessity and was wondering if it is possible to develop... Clumsy as I am, I've lost my hear rate monitor watch (meaning I still have the strap to put around me, but I've lost the watch which shows you the…
Nathan
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How to remove sidelobes while computing frequency from fft?

I am currently operating in vhf band AND trying to detect frequencies using Fast Fourier transform thresholding method. While detection of multiple frequencies , i received spurs(May not appropriate word) in addition with original frequencies, Such…
Atif Javed
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How to send multiple commands to xbee router in one data packet transmission using arduino uno

I was wondering if I could control multiple IO pins on the xbee remotely with one command from a coordinator. I can easily send one IO pin high or low as…
Steven Crisp
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Radio resource usage for USSD communication

These questions are about radio resource allocation and consumption during USSD communication. Things are located on different layers and should not interfere; yet we recently put live a service (end of call balance notification) with a USSD push…
mszmurlo
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