The transmitter tag has no wiki summary.
-4
votes
0answers
40 views
Wireless chip with long range and high transfer rate [closed]
I'm about to build an helicopter with which I'm going to include a camera. I wonder what kind of transmitter and receiver I need to transfer wirelessly the commands plus live video from the camera.
...
-1
votes
1answer
101 views
Question about transmitter/reciever
I have built a transmitter/receiver with an antenna and crystal. I am wondering if it is stable.
Here is my transmitter:
simulate this circuit – Schematic created using CircuitLab
Here ...
-4
votes
2answers
174 views
How to make a Transmitter/Receiver [closed]
I am trying to make a transmitter and a receiver, I have two crystals and two antennas (basically a straight piece of metal with plastic covering), how could I make a transmitter and receiver with ...
0
votes
2answers
108 views
Checksum done without microcontroller
How could I transmit data from a device such as a distance sensor or quadrature encoder with an RF transmitter and also transmit a checksum or will I have to use a microcontroller such as the Arduino?
...
2
votes
2answers
111 views
Is there any circuit like “Burglar alarm ” or “Proximity dector” with a range of 100 meters
I am in search of a circuit which works with
IR or RF wave with a range of 100 meter to detect proximity or burglar.
I need this to detect the presence of human or animals
One thing important is i ...
3
votes
1answer
78 views
How do I determine the proper FM transmitter strength?
I want to build an FM transmitter that will transmit (on an unused frequency) from my laptop (near my video projector) to my receiver (about 20' away on the other side of the room). Then, I thought ...
5
votes
4answers
139 views
Digital Compass identifying direction of travel for use with trains
I work in a control center for a train company in the UK. Our trains work in either direction but only one end has first class carriages. Because trains on our network reverse quite a lot it is ...
3
votes
1answer
237 views
FM Transmitter Circuit
I'm trying to make a FM transmitter work properly. I built the following circuit :
I can synchronize with 94.8Mhz channel on any FM radio, I know that because the original sound from that radio is ...
1
vote
1answer
87 views
Spark Transmitter with flyback driver and good arcs
I recently built a Fly-back Driver with a fly-back transformer and a primary voltage input of 12 volts and the arcs are about an inch long ( i don't know the exact output voltage because I don't have ...
-2
votes
2answers
158 views
Ultra low power Micro Wireless Audio Transmitter/Reciever [closed]
I'm am trying to send a signal from a device to a receiver. The signal would need to travel through walls/an enclosed area up to at least 150'. The signal would have to be powered by two AAA ...
0
votes
2answers
467 views
Transmitting GPS data to Raspberry Pi
I am trying to figure out a way to get GPS data from a remote source to a Raspberry Pi. The remote source would be a helmet mounted GPS receiver so it would need to be small and preferably ...
0
votes
1answer
126 views
What kind of Transmitter and receiver would I need? [closed]
I am trying to figure out exactly what it is I am needing, I am wanting to protect my chickens from my dog killing them! I want to place a small transmitter onto a leg band which will be placed ...
0
votes
1answer
235 views
How to make a cw transmitter with a crystal oscillator (A0645147)?
I am trying to make a very basic cw transmitter, so far i got a 5V crystal oscillator: A0645147. Whenever I apply voltage to it i can pick up the signal on my handheld however i am not hearing the ...
1
vote
1answer
59 views
Power and decibels
In one of the examples in a engineering textbook, I noticed that the decibel value for the Power of a transmitter (also known as modulator) was 20DB and this was said to be equivalent to 100W.
...
1
vote
1answer
340 views
How to measure distance from moving object using RFID?
I want to make a project on an anti-collision system using RFID. I'm facing many problems selecting RF reader and tag: the required UHF generator, tags and reader are expensive.
Any suggestions on ...
2
votes
1answer
83 views
Video Transmitter/Receiver Books&Schematics [closed]
I'm looking to build a video/audio or just video transmitter and receiver for use in robots. I'm primarily doing it as an excercise, but I'd love to be able to get a range of 100-200 meters. I'd love ...
2
votes
1answer
157 views
A complete Radio electronics guide
I want to learn all the basics about making a simple radio project.
The project is simple... One transmitting device (which only sends out analog signals of some decent frequency.. say 50MHz) and one ...
0
votes
1answer
140 views
Dangers of building a radio transmitter?
As an educational project I am interested in building a radio transmitter (either AM or FM, probably AM to start) similar to the ones that you take in the car that can play your iPod.
The car ...
-3
votes
1answer
111 views
What's the cheapest way to receive live video from a weather balloon? [closed]
I was thinking about sending a weather balloon payload up to the lower stratosphere or so, and thought that a live video feed would be a cool idea. The camera would be a webcam connected to a ...
1
vote
1answer
245 views
How to calculate the range of a RC transmitter
When searching for a transmitter for a RC application in most of the cases they don't provide anything about the range of the module. Just power and the frequency.
The Tx power must relate to the ...
1
vote
1answer
62 views
How do I troubleshoot a broken SAA3004 Remote control transmitter used in a remote control?
I'd like to troubleshoot and fix a broken remote control for a Guldmann ceiling lift that uses the SAA3004 remote control transmitter (documentation below in link). Can someone explain the tools ...
0
votes
2answers
79 views
How to polarize a signal before sending it to the antennae
I am an electronics noob and searched around the FAQ and this question seems askable. My questions are:
How can I create polarized signals and are there any parts I need to be aware of to easily do ...
2
votes
3answers
206 views
Changing frequency on RF Link
I am using these RF link modules for a project since I need a cheap, small, and simple wireless link between two microcontrollers. The data being sent is a single integer and can be spam sent to ...
2
votes
1answer
486 views
FM Transmitter Modulation
I am designing an FM transmitter as a learning experience and for fun, but I am having some difficulty with FM modulation. I am using a VCO with a Colpitts topology and common emitter configuration. ...
3
votes
2answers
228 views
Product design requirements to pass FCC regulations
I've been spending a lot of time looking at 47 CRF 15, and specifically .231, and I don't understand how these limits are possible for many products. I'm designing a remote control for a product that ...
0
votes
2answers
1k views
How RF 443.92 MHz works?
I have an RF 443.92 MHz transmitter and the receiver, the model is TWS-DS-3 and I'm trying to understand how does it works. There are 4 pins (GND, Data In, Vcc, ANT), I'm going to wire the Vcc on a 5V ...
0
votes
1answer
209 views
Multiple micro solar power wireless transmitters / receivers operating in close proximity? SRDs
Hi I have a few questions about a Tx / Rx idea.
Description
Approximately 10 transmitters and 10 receivers are expected to work in close proximity of each other. However Rx1 only receives information ...
3
votes
2answers
287 views
Why did my FM transmitter mysteriously die?
I made a little FM transmitter project a few months ago. I used an Arduino, a litle 4-digit serial LED display, a couple of buttons and an FM transmitter component with breakout board
I had this put ...
-5
votes
1answer
463 views
How can I make an ultrasound transmitter like that one? [closed]
Here is the target url http://allthingsd.com/20110602/demo-at-d9-ubeam/
I am interested in repetition of Perry and Dweck's charge system. I've seen the Power Supply, that they used, but I can't see ...
2
votes
0answers
119 views
Good compact antenna for FM audio transmitter module?
I've been looking at building a short range FM transmitter using this module, the idea is to create a small module that I can integrate into other projects. I'd prefer having the antenna on the same ...
1
vote
1answer
274 views
FM bug Circuit Issue
I implemented this circuit stripboard layout but when I connected this device to phone, there is no pulse in phone reciever. Please notify me what am I doing wrong!!
And here is my implementation ...
0
votes
1answer
147 views
Building a telephone spy
I am implementing the following circuit
but I am stuck at one point.
How can we input the wires in IN1 , IN2, OUT1, OUT2? I don't know which wire to insert because there are almost 4 or 5 wires ...
-1
votes
2answers
1k views
How do i calculate the frequency of an fm transmitter circuit?
Below is an FM transmitter circuit I found on the web that I would like to build from scratch.
How I would calculate the carirer signal frequency so that I know where to tune my FM radio?
If I ...
1
vote
1answer
531 views
Building a UHF FM audio transmitter
I'd like to build a UHF (~800 MHz) FM audio transmitter. I have no experience in electrical engineering but I study physics and I'd like to acquire practical experience in electronics. In fact my goal ...
1
vote
2answers
535 views
Is it possible to use 2-way walkie talkie to locate position?
Basically, given no GPS is allowed, can we use walkie talkie to locate the position of a car / a person?
I am assuming the walkie talkie is using radio, not GPS-based.
What equipments will be ...
0
votes
2answers
135 views
Limit a radio to a single station
We are organizing a game for students where we are transmitting the daily objectives and hints over from an FM transmitter. Is there a way to limit basic radios to only be able to pick up a certain ...
1
vote
1answer
487 views
Building a small 3-axis accelerometer mote
I'd like to build a remote device which reports its current 3-axis acceleration to a nearby (<10m) receiver. It needs to be as light and as small as possible. (I have no preference as to the ...
7
votes
6answers
4k views
ultra low power mini wireless transmitter / receiver?
I'm looking for suggestions for a wireless transmitter & receiver combination. I'm basically just trying to bridge several buttons over a wireless signal(s) (i.e. send a 1 bit signal) in as small ...
3
votes
1answer
260 views
Switching Mixers for LO frequency= 4.25Ghz
I want to upconvert a square pulse of 250 Mhz bandwidth(250Mhz is the value of the first zero of the sinc ) to a center frequency of 4.25 Ghz , so that the spread becomes from 4Ghz to 4.5 Ghz.
...
2
votes
1answer
996 views
arduino rf communication: beginner
I would like to implement a home-automation system on my arduino.
For this project I would like to communicate with the different devices by radio frequency.
So that would be different 433 mhz ...
1
vote
2answers
271 views
Cheapest way to do an IR re-transmitter (IR protocol agnostic, dumb device is good enough)
Looking out for ways to retransmit IR, bi-directionally, like this:
...
3
votes
1answer
306 views
Can someone break down how this receiver works?
I'm having difficulty understand how this receiver works due to its size. It was taken from this site: http://jap.hu/electronic/rf.html. It is on top labled toy car receiver.
The toy car transmitter ...
2
votes
2answers
601 views
High-gain omnidirectional antennas for Wi-Fi mesh
Hopefully this is the right SE site a question of this nature.
Basically what I want to do is set up a wireless transmitter using a high-gain omni/directional antenna as a test-bed mesh network ...
4
votes
2answers
522 views
Wireless transmission/reception through 100 feet (30m), including concrete wall
I have an electrical engineering degree, but little experience in building wireless equipment. I need to transmit a signal through about 100 feet of distance, including a concrete wall. I need ...
4
votes
5answers
226 views
modem free high base AM data transfer possible?
not a very experienced EE, but I was thinking about a system for high speed data transfer,
and it is fairly simple conceptually, so I imagine that there must be serious flaws with the method,
because ...
2
votes
1answer
305 views
Walkie-talkie transceiver
I'd like to build a set of miniature two-way (half-duplex) radios that operate on the FRS band. It seems that transceivers for this band would be widely available. However I've not been able to find ...
3
votes
2answers
236 views
Need suggestion in choosing an effective wireless Transmitter and Receiver
My requirement is to transmit a binary form of data from one Road Junction to another road junction which is around 4 to 5 km away.
I am going to get the traffic information from each road in the ...
5
votes
3answers
1k views
How to build cheap radio propagation beacon?
I want to build a Radio Propagation Beacon but I would like to find an integrated circuit that does most or all of the work of the transmitter.
Transmit to 28Mhz (Ham 10-meter band)
Allow me to ...
