Questions tagged [transmitter]

Questions on a set of equipment used to generate and transmit electromagnetic waves carrying messages or signals, esp. those of radio or television.

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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 inexpensive....
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973 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 ...
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128 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. ...
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1answer
3k 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 ...
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1answer
258 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 ...
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1answer
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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 ...
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1answer
366 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 ...
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2answers
419 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 ...
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1answer
8k 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 ...
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1answer
189 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 ...
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2answers
125 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 ...
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1answer
359 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. ...
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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 ...
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1answer
351 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 ...
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1answer
624 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 ...
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278 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 ...
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1answer
2k 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 ...
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1answer
1k 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 ...
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2answers
1k 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 ...
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5answers
456 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 ...
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3answers
5k 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 feed ...
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2answers
475 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 ...

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