Questions tagged [radio]
The radio tag has no usage guidance.
19
questions
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46 views
Demodulation of AM signals in radio broadcast systems
I have a question regarding the demodulation of AM signals in radio systems (like car radio).
I know that in order to send the audio signal from the broadcasting station to users we need first to AM ...
1
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0answers
32 views
Where do I start with learning how to transfer data via RF
So I literally have no idea where to start but I know what I want to make.
The goal is to somehow transmit 25mb/s of data across 15km with high penetration. Acceptable for reaching through trees and ...
0
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1answer
24 views
Is there a way to quantify the amount of radiofrequency interference?
Is there a way to quantify the amount of radiofrequency interference? Do any units exist that quantifies how much radiofrequency interference is there?
-1
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2answers
38 views
Why radio communication was limited to military use and did not become popular with general public like cell phones have become today? [closed]
Why did no private company or government try to bring radio communications to general public like we have cell phone today? What were the hurdles and challenges?
1
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2answers
58 views
Is it possible to build a DIY RLC circuit for a classroom demonstration?
I was describing the mathematics of RLC circuits to my students, and was wondering if it's possible to build an actual RLC circuit with coils of wire and an inductor and a variable capacitor. The ...
2
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2answers
72 views
In the 1980s, did radio reporters actually carry around a clunky antenna contraption on their backs to communicate with their radio station's HQs?
I've been wondering about this ever since I saw this comedy TV show as a kid called Macken ("The car repair shop" in Swedish). Originally aired 1986 in Sweden, it features absurd situations ...
0
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1answer
52 views
How to connect Arduino to brushless motor through only 1 digital pin
I know how to connect motor to Arduino with 3 wires: 5v, digital pin and ground. As I know only digital wire need to control "speed control" of my motor. So, if my Arduino connected to computer and it ...
1
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1answer
51 views
Is it possible for laptop speakers (versus external speakers or headphones) to pick up radio signals?
Heard a strange sound a couple of times last week while web browsing. It sounded very much like I was listening to someone's microphone (e.g. the sound was static-y, it sounded like papers were ...
1
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1answer
16 views
How does free space path loss change with receiver's antenna's height
I have a question which seems like an easy one, but I couldn't find anything on Internet to be 100% sure.
The free space path loss equation is:
$$FSPL=20\text{log}(d)+20\text{log}(f)+20\text{log}(\...
1
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1answer
44 views
Why is the tv playing if the carrier frequencies in our RF project appear unsupported?
My group made an RCA video/audio to RF modulator for a school project. The video is a NTSC composite video signal. Here is a clip of our tv receiving the output of the project on NTSC channel 2:
...
1
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1answer
62 views
Material to absorb very low frequency radio
Is there any material that will absorb very low frequency radio light? I know that stealth aircraft use radar absorbant materials in their design that absorb radio light best at certain frequencies, ...
1
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0answers
43 views
Swapping transmitter and receiver locations
Pardon me if this is a silly question, because I don't quite study RF.
Let's say I have a set of transmitter (radio + antenna) and a set of receiver (radio + antenna), at location A and B ...
2
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1answer
41 views
Propagation loss in USRP antenna
Problem
I have two USRP antennas close to each other. I know that signal strength on the receiving end has to be at least -80 dBm. Both antennas have 2 dBi of gain. I want to compute what ...
1
vote
1answer
58 views
Measuring intensity of a radio wave reflected from a metal plate
I am building a Project that can pinpoint location of a pen or any object (something as small as 0.5 mm radius sphere) placed on a flat screen.
I am using a ultrasound sensor (initially but i can ...
2
votes
2answers
511 views
Radio triangulation with Raspberry Pi
Currently, I am thinking that since electromagnetic waves loose energy over distance, you might be able to figure out the relative distance to each of three radio "beacons" and use this information to ...
0
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1answer
243 views
Ansys multiphysics import deformed mesh to HFSS
I want to run a coupled simulation in Ansys - RF heating and deformation of waveguide. Pictures of project layout and settings are here.
I calculated RF fields and surface losses in HFSS; imported ...
0
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1answer
21 views
Calculating the link budget of antenna and receiver with free space-path-loss formula
I really know that the real calulation of the range of UMTS, GSM or LTE antennas is depending on a lot of issues, reflection, and other stuff which makes it really complex.
I need only a rough model ...
1
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0answers
59 views
Can a casio fx series do this operation?
"Calculators stackexchange" doesn't exist, so I guessed this would be the right place to ask. Can a calculator solve $-0.2 \cdot e^{-0.06-4.2i}$?
Or any $e$ to a complex for that matter. I've been ...
0
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0answers
32 views
How do brass models work (radar)?
A common practice in naval research is to construct brass models of ships to study the reflectivity of a vessel. This can (supposedly) be used to understand the way it reacts to radar and the way ...
