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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.

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Software defined radio AM band sample source

I'm interested in Software Defined Radio. I have basically no experience in any of the electrical engineering or math topics involved, but I'm reading... Rather than trying to deal with the hardware aspect of the antenna and the ADC, I imagine it'd…
Jason Kleban
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Compensating for missing jpeg bytes

I am making a program for a micro-controller connected to a radio that has to send bytes of a JPEG image to a computer. I want to know if there is a way to compensate for a situation where some bytes of the JPEG are lost. As it is now, if even 1…
Grimmer
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How _CTServerConnectionStartCellTracking works?

I'm trying to use a private API to retrieve radio cell information. Since iOS 8.3, the old API doesn't work anymore. So, I'm trying to find another one. I found this method: _CTServerConnectionStartCellTracking Apparently, there are CFStringRef…
Boobby69
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EnergyMicro and EZradio Pro (Si4463)

I cannot find the solution for my problem. If somebody has worked with Si4463 radio module? According to the datasheet, it must be simple, but I cannot make it work consistently. My transceiver sends data once each second. 1 byte preamble + 2 bytes…
user3091443
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Tracking Phone Position in real world via Android with Radio or other signal

I am currently doing research on ways to track a phones position relative to some radio/bluetooth/wifi signals. I have already developed a small application using the android Wifi manager to scan for access points but this solution is just way too…
Seacomit
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DTMF monitoring via multimon, awk and espeak

How to listen to the spoken DTMD digit every time the sound card capture one? The objective is radio controlling my pc and interfaces activities dialing dtmf tones via a hand-held transceiver. I used multimon to hear DTMF tones I tried to use awk…
m33600
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433MHz Sender and Receiver in Python on Raspberry PI

Is there any way to get a working 433MHz-Sender or -Receiver in a Python Thread? I have tried those from Ninjablocks and those from Adafruit. But the Problem is that these are all c or c++ scripts, that are outputting to stdout and have no end of…
Tobi
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Arduino RF sensor network

I'm currently designing a sensor network that will have small ATtiny85 probes that each have a temperature sensor, a barometer, and a humidity sensor. I think I will use these (http://goo.gl/TqaDjl) to communicate as they are low cost and don't need…
Dragongeek
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Android AT commands - Issue with connection

My device is Asus transformer with 3G. I send AT-commands to /dev/ttyACM0 to turn on the data connection. In logcat I see that the provider gives me IP, DNS and default gateway addresses. Then I bring up the network interface rmnet0 and assign ip…
Ant
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Development kit for Bluetooth which allows customisation of the modulation algorithms

We need to perform some experiments on the Bluetooth protocol, and for this we need a development kit which allows us to implement/modify different parts of the Bluetooth protocol stack. We have been looking at the TI MSP430 Wireless Development…
Bjarke Freund-Hansen
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Sine Table Interpolation

I want to put together a SDR system that tunes initially AM, later FM etc. The system I am planning to use to do this will have a sine lookup table for Direct Digital Synthesis (DDS). In order to tune properly I expect to need to be able to…
NoMoreZealots
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What's the most efficient method of determining a 16 bit checksum calculation? [CRC Hell :-(]

I am currently engaged in a research project involving sniffing and modifying radio packets, and unfortunately I've hit a bit of a mathematical brick wall. :-/ The packets in question have a 16 bit preamble of all 1's, followed by a binary 0,…
Omikron
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radio frequency that the phone's cellular radio is using to talk to the tower / base station in Android

What I am looking for is the radio frequency that the phone's cellular radio is using to talk to the tower / base station. I need to Calculate the Frequency and display into my Android app. Any Guideline. Thanks
ALi
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about Bluetooth LE Link Controller in esp32

When going through esp32 datasheet it been seen that there is wirless circuit section in the block diagram. I am wondering how the bluetooth functionality is implemented in microcrontrollers like esp32. Is it a hardware inside the Soc or whether it…
Mrk234
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GNU Radio + HackRF: RuntimeError: firdes check failed: 0 < fa <= sampling_freq / 2

I just started using GNU Radio, I must say I am quite a noob but I have some background on RF related stuff. Here's the thing: I recorded a file that I now want to repeat through my HackRF and GNU Radio. This is the exact settings for the…
scarecrow
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