Transmitter Definition and 122 Threads

I am attempting a proof-of-concept demonstration of so-called "moon bounce" or Earth-Moon-Earth (EME) communications at optical frequencies. Hams are allowed to use ANY frequency greater than 275 GHz, with ANY modulation, and the usual 1500 watt power transmission maximum. I will try to use a...

This video claims that the transmitter is self powered and hence needs no battery or other electric connection. Is this possible? I have never come across an electronic device that runs self-powered. Couple of things I think might happen here: 1. A solar cell in the transmitter? 2. Everytime...

Then might be regarded as continuation of discussion https://www.physicsforums.com/threads/impedance-matching-when-the-transmitter-line-and-load-impedances-are-different.1009266/ where unfortunately it's not more possible to post further replies (why?). So I would like to continue it here, since...

Assume we have a general rf system where source with impedance ##Z_S## transfers a signal to a load with impedance ##Z_L## through a transmission line with impedance ##Z_T##. We want to match this system in order to maximize it's effiency: In https://en.wikipedia.org/wiki/Impedance_matching...

Hi, guys! Could anyone provide an explanation about how the following AM transmitter works? It is similar to the AM transmitter for project 122 of the Snap Circuit kit by Elenco. Does it work as a switching modulator?

wavelength is .3 m to 6m, a 3m waveguide can do up to the 6m λ, so it will reflect all the frequencies concerned

For a project that I'm making it has a raspberry pi 0w as its cpu for running autonomously, But I want to make use the raspberry pi 0w as the receiver as well. The range needed is about 3000 feet minimum. Currently I have been looking at some rc and drone receivers that would work as well, but I...

Hi, the following statement is taken from the telemetry standard IRIG Standard 106-11: The RF signal is typically generated by filtering the baseband non-return-to-zero-level (NRZ-L) signal and then frequency modulating a voltage-controlled oscillator (VCO). The optimum peak deviation is 0.35...

Hi everyone, I'm pretty new to electromagnetism and have no experiences in this topic. I have a signal generator (Digital Dual Channel Funktion Signal Generator) and want to generate two signals (530 and 550 Khz signal) and want to transmit these generated signals to the points on a table...

Hello. I've got a last homework before the summer, which is due to be handed in tomorrow. The question is the following: "How is it possible that a normal transmitter, used for measuring differential pressure, can get the label FT, PT, LT in a process scheme?" Of course, the labels stands...

Can you build a fm transmitter with A crystal oscillator? I already have a 100 megahertz crystal oscillator. I can't find instructions on how to do That on the internet.

Hello, I am a Biologist currently working on a Biocommunication related project. To explain the project, I am going to use a Piezo sensor attached to the bone and it can detect bone cracks using EMI. I would first energize Piezo sensor with certain frquencies and it generates Ultrasonic waves...

So I recently picked up 40 of 10.525 GHz Microwave RADAR transmitters: I opened up one out of curiosity and had something like this (image attached) . I noticed some parts of the PCB aren't even connected to anything. How do the different shapes and sizes of the PCB interact with each-other...

Homework Statement [/B] A radio transmitter radiates isotropically at the frequency of 90.8 MHz. The peak magnetic field at a receiver, 9km from the transmitter, is ##9x10^{-10}T##. Calculate the maximum amplitude of the induced emf in a 12 turn coil with area A = ##90cm^{2}## at the receiver...

I've been reading about effect of high SWR in antenna system on my ham radio. A lot of people are talking something like - You can't have SWR higher than 1.5 to 1, it will blow final transistors of your transmitter. I've read about it and it doesn't look to be true. In fact, it seems like power...

Hi there! I'm looking to create a small (max 20 foot range) radio transmitter, to direct a focused radio beam at a receiver, for the purpose of remote switching. Ideally, I would like the device to work at a relatively "exotic" frequency, as I would think there is a lot of radio noise where I...

I'm curious to figure out if I'm operating a transmitter with safety compliance regarding its HERP (Hazards of Electromagnetic Radiation to Personnel). Put simply, the transmitter has a low and high output capability of 2w and 10w. The antenna it operates on has an 11db gain. Radiating around...

I'm completely new to transmitting/receiving signals, but I wanted to get a scope of what kind of components are out there that I could use to build this system. I wanted to read the voltage drop across a resistance thermometer (Vt) and send this signal wirelessly to another circuit, where I...

Can someone enumerate the equipment needed in a microwave transmitter control room? i already searched the net and i somehow don’t understand anything haha. also can you please explain what each equipment does? thank you :)

Hey, I was wondering if any of you smart people could help explain in a very simple way (if possible) how the first FM transmitter and receiver worked? I know, for example, that many current transmitters use a voltage variable conductor to change the frequency of the wave. Did Armstrong do...

I was reading about WiMAX networks and how they can provide a 30mbit connection to a user 50km away! Now, I don't have a great understanding of data transfer but I assume inverse power law applies?? Pf = Pi / 4*pi*r^2 At 50km Pf = Pi / 10^10 * pi For Pf = 30mbit/sec = 30*10^6 Pi must equal...

I have built a remote control car, pwm speed controll and all, using picaxe microcontrollers and gained a lot of experience doing it. I used a low power i think 20mw transmitter you can find all over ebay that uses a 433hz carrier wave. A long time ago i found a 1w transmitter meant to be a step...

Given the following: A directional radio wave transmitting antenna which creates a beam (diameter in mm), a current in volts, and a frequency (Hz), is it possible to calculate the em wave voltage (v/m or w/m2) immediately next to the antenna? and then at a distance of 10meters? What...

Hello :) So my question are: -how to build a transmitter and a receiver? -how do they actually work?(in detail,microscopic and macroscopic) -which scientist was the one who invented this tech and if possible,are there any papers published that can be red today? Thank you for your time.

Hello, I'm currently working on satellite model for high-school compatition, and I'm not sure if there's a visual difference between a reciver & transmiter antenas (on satellites)... Also, is it possible to satellite to recive a radio wave information from another satellite Thank you

Hi, I'm just curious because I know wifi uses digital FFT to send and receive signals. (I can't really remember why) But when I imagine a signal being sent its like a squiggily wave, so what method does the reciever use to approximate the instantanious values of the signal into a mathematical...

I recently read about the early spark gap transmitter..But I don't understand how the EM waves are generated and transmitted..Induction coil creates sparks in the gap but what produces the waves and how are they transmitted?? Need I study electromagnetic waves in detail??

If instead of sending electromagnetic wave in transmitting antenna by shuttling electrons.. what would happen if we emit photons from photon emitters like in double slit.. would receiving antenna that receive wave receive the photons?

<< Mentor Note -- post separated out of a different thread to deal with a separate question >> Hi, I am looking transmit as well as receive power within close proximity. Currently I am looking at 27.255 MHz AM in the citizens band. It is listed on Wikipedia and in statues I found to be for...

I studied the working of the fm transmitter and end up making my own. The first part is amplifier and second (right) part is colpitts oscillator. The circuit works good on simulator. The output is AM modulated wave lying in fm band so it could be detected by radio easily but the circuit is not...

I am working on a project, however I am having trouble finding the right material for it to work. I am looking for a nano-material or any molecule that will emit a radio frequency when subjected to a voltage or a current at around 37 degrees Celsius. I would really appreciate it if someone could...

Hi I want to transmitt a video rca signal with dome of the 433mhz transmitter and receiver modules you can get on ebay for cheap. I have used them a lot and have accomplished transmitting data through picaxe microcontrollers successfully. But could I use it to transmitt a video rca signal...

First off, this is my first post here. If this is in the wrong section I apologize and ask that it be moved. I am a amateur radio operator. We have experienced issues with a rogue radio operator recently, who is maliciously transmitting noise. I think it is possible to determine his position...

I saw some AM broadcast radio towers, several to form an array in order to direct the energy dependant on the time of day. I guess they covered 500+ meters, horizontal. I am now listening to shortwave transmissions on youtube, of things like OTH radar. I wonder in both cases, what...

Hi all, I was just wondering, what is the difference between non-adrenergic non-cholinergic (NANC) transmitter and co-transmitter in the synaptic communication between neurons? In particular, what are their different functions? Many thanks, Jay

How can I build a transmitter using radio waves with pulse modulation (Which I think [PM] means sine waves that either transmit or don't)? I can't find anything on how to build a PM transmitter, I can only find FM/AM ones, and I'm not smart enough to convert that information to the way I want...

Hi, I have an application of pressure transmitter at 410 deg C max. process temperature. Transmitter can withstand only up to 350 C at Atm pressure. The original length of tubing for maximum working Temp of 310 C is shown in the attach file (Sketch B) and We are planning to extend the...

Why modulate the "data" sinusoid onto a "transmitter" sinusoid? (Sorry about the simple question but this stuff isn't exactly my specialty) From howstuffworks.com ... Why can't you just send the sine wave produced by a person's voice directly through the air (or whatever channel you are...

With a 5W FM transmitter and a normal dipole antenna , to what range can I transmit. To be more specific, what will be the radiation pattern like (Can I get signal uniformly as in a circle where the center is antenna). Using which antenna, can I achieve maximum range omnidirectionally...

Homework Statement A prism of 90-45-45 was placed between a microwave receiver and transmitter. What steps should I take to know the index of refraction of the prism given that its material is not transparent to microwave? I positioned the prism so that a side of the prism is perpendicular to...

I am kind of confused. Does the radio transmitter modulate the waves or change it into alternating current. If it does both then which one is done first? Thanks for your help.

Homework Statement Hi I am weak at circuit, but I need to analyse how this circuit works and to determine the values of C4, C5 ,C6,C7, and L1. I need help for the understanding function of the whole component and determine the values of these component Homework Equations f=1/2√LC...

Hello, I am a final year student of BEE Telecom. I chose my Final Year Project to design a Transmitter and Receiver for GPR. GPR has already been developed in my institute. It uses VNA as its source. Since VNA is a multipurpose device and the already-implemented project used it to find S11...

Hi everyone, I'm attempting the laser audio transmitter project. And example of it is found here: http://www.freeinfosociety.com/site.php?postnum=2310 I'm quite new to electrical engineering type work, and am a little confused by why the circuit works the way it does. The diagram is this...

hey im in 11th grade and I am in a electorinc trend at school, we have to make a project for school and i want to combine bluetooth technology in it. i looked i looked Through the internet for guilding- how it is built, are there any protocols, how to use / transmit/recive - everything. so far i...

I am a beginner at circuit design.i need to find a way to explain how an fm transmitter works which i do not so any of you my sincere friends can explain to me how the circuit below works and does the necessary calculations I'm in your debt Here is sample proteus file and circuit diagram :

Hello everyone, Finally I found a useful website where I can find the answers of my questions:) I will take signal processing course soon and I thought "building a low power fm transmitter" is a bright idea to train myself to a certain level... Though I need your help and I don't have...

Hi: I'm new in this site I need help here please I need a circuit that works as : 1- transmitter uses radio waves or any type of waves 2- sends waves for long way more than 3 km 3- consist of simple component than can be found in old electronic instruments such as old TV or radio...

I've been trying to hash this problem out with some friends of mine, but we haven't been able to find a satisfactory answer: Tesla coils are (in an extremely basic sense) like a transformer. There are two coils of wire... the first one having a large current and not-so-large voltage. The...

Homework Statement An electric dipole antenna used to transmit radio waves is oriented vertically. At a point due north of the transmitter, how should a second electric dipole antenna be oriented to serve as a reciever? Homework Equations Im not sure if my answer below makes sense, is...