Radio Definition and 671 Threads

I'm ready to begin proof of concept experiments on the Mk IV Tesseract, following on the limited success of https://www.physicsforums.com/showthread.php?t=205845" What I need is a motor that - is reasonably compact (we're talking <2 centimeters) though weight is not a factor - can be...

I am new to this website but I would like to know how to build a homemade radio using an electro magnet and a germanium diode crystal. Are ther any other components required to complete the construction of the radio?

Hello I have googled to no avail. I am after the code to retrieve if a radio box is checked or not in Visual C++. I am not using MFC which all of the tutorial on the internet do. Any ideas? A few pointers in the right direction possibly?

Hey PF, I want to resurrect an old robot radio I have sitting around. What exactly is involved with building an AM/FM receiver?

Homework Statement (a) The wind-up radio is a wonderful example of the process of energy transformation from one type to another. The radio is operated as follows: (i) The user turns a handle that winds a metal spring onto a spool. (ii) The metal spring then unwinds slowly, through a...

hand cranked radio question (ignore - figured out) Your two friends argued whether they should crank more cycles (e.g. 180 cycles in 1 minute) or longer time (e.g. 180 cycles in 2 minutes) to efficiently charge the internal batteries. They couldn't conclude with their knowledge and decided to...

Problem: Centaurus A is 15 million light years away and a radio telescope can resolve structures of 1s of arc across. Show that the Structure is 75 light years across. Please Help!

One isotope (X) contains an equal number of protons and neutrons. Another isotope (Y) of the same element has twice the number of neutrons as the first isotope does. Determine the ratio rY/rX of the nuclear radii of the isotopes.

Homework Statement A radio station is allowed to broadcast at an average power not to exceed 24 kW. If an electric field amplitude of 2.6×10−2 V/m is considered to be acceptable for receiving the radio transmission, estimate how many kilometers away you might be able to hear this station...

I have been reading about Tesla and dipole senders. A dipole sender is like a long pole with sends out a signal at both ends. Tesla sometimes grounded his radio dipole senders so that one sending dipole was a ground. Likewise, he grounded his radio receivers. I live in the mountains and get...

Link: http://www.santafenewmexican.com/HealthandScience/LANL_scientist_makes_radio_waves_travel_faster_than_light Is this true ? Can radio waves or light really be send faster than light using a rapidly spinning magnetic field ? Sorry if there already was a thread about this, I couldn't...

Homework Statement Greetings I 'd really appreciate some help with this problem thanks a lot in advance. Find the radio of an equilateral triangle if it is inside a circle, and if a side of the triangle has a length of 24. Homework Equations I had to use a right triangle of the form...

When hearing the same sound coming out from a Radio and a TV simultaneously (e.g., when a channel is beeing broadcasted on the radio and on TV at the same time), the radio sound precedes the sound coming out of the TV. The phenomenon is quite noticeable. The reason for this must be...

I've been doing some work with amateur radio recently, and realized that I don't have an adequate detailed, low-level understanding of the basic physics behind exactly how electricity and radio work. My background is in math, chemistry, biology and the physics of "medium sized" objects (orbital...

Is a radio telescope less sensitive on the galactic plane? If so, why? /San

Hello, I have a '98 kia sportage and recently the radio has been acting up. It works sometimes, and other times, i am left with nothing but static. It seems to work a lot more often when it is hot out, but just the fact that it works, then doesn't, makes me think that maybe something is loose...

Homework Statement Two shortwave radio antennas broadcast identical, in-phase signals at the same frequency. The transmitters are 176.0 m north, and 176.0 m south of Western Ave, respectively, as shown (that is, they are separated by 352.0 m). Western Ave is 452.0 m long. Starting at the end...

How does the antenna and receiver on a radio turn electromagnetic radio waves into sound?

Both my and my wife's car are fairly new. Yet the radios are very bad. In the old days there was some adjustment that could be made called trimming. Does anybody know if there is a procedure for optimizing on todays radios? AM.

Hi. I work for a security company and we currently have a challenge. How do I remove a 1170 KHz AM radio station from my 8 microphones that are installed with 2 Conductor shielded, 22 gauge with a 24 gauge drain wire with lengths ranging from 15 - 250 feet from my server room? The radio...

I get random radio broadcasts coming from my logitech speakers when they are turned on but with no volume. Why is this?

Anyone ever hear of or use Pandora? www.pandora.com Basically, it's an internet radio website where you input the name of a song or band you like. It will then play that song or a song from that band. After that it will pick other songs, many from other bands, that it thinks you will...

A certain radio tower was stabilized at the top with guy wires, and at the bottom with a concrete foundation. So, it was stable at the bottom and at the top. In windstorms, it wobbled violently in the middle. Eventually the tower collapsed. Using wave theory, explain why this happened and...

Anyone else listens to her? http://www.radiodelilah.com/home/home.html Her voice is so seductive! Do you know any other good radio shows I like John Tesh (http://www.tesh.com/) and there's one other who talk about ancient ghostly stories ..

Hi, all. Im new to telecommunication field. I have a few questions. Hope you can help me. First, I am not clear how digital signal processing works. My understanding is: baseband frequency is modulated as high frequency on a device. Such device sends the signal to another device, which...

Radio waves are electromagnetic.Right?? "Phoenix was on track for anticipated entry into the atmosphere at 4:30p.m. Pacific Time and reaching the surface at 4:38 p.m., although confirmation of those events comes no sooner than 15 minutes, 20 seconds later, due to the time needed for radio...

I was just thinking the other day about how they triangulate on radio frequencies. Imagine an illegal fm broadcast they are trying to find. From thought (not necessarily right), they would have 3 vehicles with receivers that would form a triangle and depending on angles and the time it takes...

1. An aluminum airplane is flying west, parallel to the ground, at 350 m/s. The Earth's magnetic field produces a downward component of 8.30 x10-5 T at that point. For the purposes of this question, treat the wing as if it was a conducting rod. a) What is the magnitude of the potential...

Homework Statement A radio transmitter radiates at the power of 10 kW at a wavelength of 100 m. How many photons does it emit per second? Homework Equations E=hv, and some other equations of beginnings of wave mechanics. The Attempt at a Solution I had no idea where to start.Please do not...

This is a strange experiment (or not so compared to some of the experiments I've done) that I am currently undertaking, and require your help. I have built an interferometer of sorts. Two metal funnels of diameter 200mm are attached together by copper tubing (20mm?) through a Y junction with...

Radio Contolled Helicopters Concept! Hi guys does anybody know concepts behind the Fixed pitch Radio heli principle Thnx a lot in advance

Suppose some astronauts have landed on Jupiter. (a) When Jupiter and Earth are on the same side of the Sun and as close as they can be to one another, how long does it take for radio transmissions to travel one way between the two planets? Suppose the astronauts ask a question of...

http://www.mjyoung.net/misc/quantum.htm read this and tell me if it works or if its a crock, it sounds good, but all I've had is high school Physics

As I've been studying up on EM radiation, I've come to the conclusion that radio and light waves are not the same thing. Radio seems to be nothing other than a continuously flipping magnetic field (source: http://www.pbs.org/wgbh/aso/tryit/radio/radiowaves.html). In this way, there do not seem...

I've been trying this for 3 hours and I'm getting nowhere. These are the graphs I made for Hydrogen Intensity vs Frequency for a radio telescope that transits the sun and galactic arms of the galaxy. http://img220.imageshack.us/img220/5904/helpgraphia6.jpg...

Not sure if I'm in the right forum, but does anyone know anything about the mechanism behind using radio waves to disassociate hydrogen and oxygen atoms from salt water?

I purchased a radio transmitter for my Zune, and it takes quite a bit of work to get it to function properly. I have not been taught much about how radio waves function or why my transmitter is behaving the way it is, so help me find a solution to my problem! When my radio transmitter...

how can you build a device that can produce radio waves?

While driving home from Portland today I listened to the only station that was actively reporting on today's election results. It took awhile to realize that this was right-wing radio because for a time the reporting was just news. But then she - the show's host - started in on her naive...

There are hundreds, if not thousands, of RF signals all around us from those at VLF frequencies to microwave frequencies and I suspect if you set up a very long random length of wire as an antenna, there would be a resulting induced electrical signal that is the sum (and differences) of all...

I have a simple question - but I somehow doubt there is a simple answer. 1) I would like to start a small, non-commercial, home transmitted FM Radio Station - mostly for fun and as a hobby. I have seen an 18W transmitter for a reasonable price. I live on relatively flat land in the country...

Let's say that you make a huge (radius of a few meters) coil of wire. Will radio waves cause a current to run through it? If so then how much? Thanks.

How can I use radio wave to turn on/off a siren? I think it is possible for me to design a radio signal through this schematic: http://www.aaroncake.net/circuits/fmtrans.htm The problem is, how do I design a receiver that can switch on a siren by receiving the radio signal?

Hello everybody. As I'm new here, maybe someone can help or direct me to other resources that will assist in my investigation. I am looking for information that can help me select the proper radio frequency for use in a new project. The following is an overview of the project and the...

while dealing with radio telescopes how can we remove the noise and other disturbances like microwave radiation etc.

The objective is to "design and construct an FM radio receiver" that is able to tune to commercial FM radio broadcast channels spanning from "87.5 MHz to 108 MHz", and to produce audible demodulated output. can anybody help me with a simple circuit for this assignment with proper values for...

Have these papers been discused. http://arxiv.org/abs/0704.1125 High Galactic Latitude Interstellar Neutral Hydrogen Structure and Associated (WMAP) High Frequency Continuum Emission Authors: Gerrit L. Verschuur (Submitted on 9 Apr 2007 (v1), last revised 23 Jul 2007 (this version, v2))...

Hello, Is there a formula to convert a certain radio frequency to temperature? Thanks.

Homework Statement Designing an FM Radio Receiver. You enjoy listening to KONG-FM, which broadcasts at 96.6 MHz. You detest listening to KRUD-FM which broadcasts at 96.5 MHz. You live the same distance from both stations and both transmitters are equally powerful, so both radio signals produce...

Hi all, I'm now very busy trying to findout how to block external RF at my apartment room. I'm on 23rd floor. A huge radio boardcasting tower (714KHz, 90MHz) is just 20 meters away running along with my building. It's higher than 25 floors. I know that many GROUNDED conductive surface can...