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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Is it possible to sense a temperature using an infrared LED?
Is it possible to make a remote thermometer using a standard IR LED as a transmitter and an IR receiver diode as a receiver?
The range is about 5 meters. I know there are chips available for this ...
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Debugging an automotive FM transmitter
Transmitter is a 12V automotive audio-to-FM transmitter unit. Belkin Tunecast F8M066.
Receives both power and audio fine over the cables into the unit as measured on the board. 7.6 MHz crystal is ...
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Battery State Indicator LEDs in Wireless Charging
I am working on a custom wireless charging System. I am using the following ICs
Transmitter IC: https://www.analog.com/media/en/technical-documentation/data-sheets/LTC6992-1-6992-2-6992-3-6992-4.pdf
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Books/Material for RF transmitter/receiver design [closed]
I am doing my thesis for my BSc in EE. Due to a lack of equipped laboratories in my universities, I cannot do a project in microwave-integrated circuits, as I would have preferred. I am therefore ...
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How to make very low range FM Transmitter?
I am experimenting with building an FM transmitter. I want to make it only have a range of a few meters so I can detect it on my radio at home at a distance of a few meters. The circuit diagram is ...
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USB 3.1 Super Speed Signal Directions
This is a question about the signaling direction of the unidirectional USB 3.1 Super Speed Signals known as RX+/RX- and TX+/TX-.
Context: Imagine you have a standard USB-C cable, and a phone. On one ...
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What is the purpose of the choke inductor coil in this qrp radio transmitter?
After building and testing these circuits, I want to understand the purpose of the choke coil in these qrp trans(ceiver)mitter circuits.
https://www.qsl.net/py2ohh/trx/curumim/curumim.htm
I ...
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AM Radio Transmitter
I have been trying to make an AM transmitter and I found this schematic from a persons college project. I understand what is circled in red but the rest I am struggling with. The part circled in red ...
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RF shield mesh rules of thumb
When you place a RF transmitter within a metal enclosure with openings that can be approximated as a mesh, are there any rules of thumb for either letting the signal pass through or get attenuated?
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How far could I pick up VHF from?
I’m new to electronics but I'm doing my ATPL pilots license soon and am interested in the EM spectrum and in particular, radio waves. I was wondering what factors affect the maximum distance I could ...
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Is it possible to use RF signal wires to let a model car center itself on it using phase differences?
I'm looking for a way to let a model car (1/24 to 1/18) know how centered it is on a road. I thought about using a buried wire in the middle of each lane of the road. Would it be possible to detect ...
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Replace internal antenna with external antenna
I'm trying to figure out whether it's worth trying to replace an internal antenna for an external antenna of a uhf transmitter/receiver to get a stronger signal in order to get more distance from them ...
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Can I modify a toy RC transmitter?
I'd like to modify a cheap supermarket RC toy car to go reasonably slower for extended run time and easier control. (would be present to a kid) I have not bought or even selected the toy in question, ...
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Getting distance measurements from three different sensors
I'm trying to implement a small-scale localization. My goal is to track a toy vehicle on a Tracking Panel that I will design.
I'm going to make an application which receives distance measurements from ...
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WiFi Transmitter/Receiver [closed]
I want to create a small, battery-powered electronic device to detect the presence of AC voltage after a power outage. It would then transmit notifications to that effect.
The two components of the ...
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Can a small, simple and portable (button cell powered) RF transmitter be made to send a pulsed or constant 550-1000 kHz signal? [closed]
I'm trying to make a beacon to use with my fishing sonar. It would be attached to the leader of my bait to more easily track its depth and location. A small transmitter and a button cell battery, made ...
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Yet another 807 tube transmitter
I just can't seem to get away from these 807s. Although I am to the point where I might replace them with 6146s.
I built this transmitter with a 6AG7 oscillator, and 2x 807 final amplifier. The ...
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Will a spark gap transmit a signal an FM receiver can "hear?"
Forgive me if this question is a duplicate, I looked around but did not see anything that quite fit.
The scenario: I found a box of old FM receivers, the kinds used (I think) for assistive listening ...
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Ideas for lowest power power solution for two wireless devices to acknowledge each others presence periodically
Hi I am working on a super low power solution for two novelty items that are going to be tiny and have to have the lowest power consumption possible.
Basically what I'm trying to pull off is having ...
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Is it possible to transmit a video over a 433 MHz RF module?
Is it possible in any case to transmit a video over a 433 MHz RF module?
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Antenna design for outdoor waterproof sensor
I am designing a low-cost soil moisture sensor with an RF433 radio. I put my sensor in a closed PVC tube for outdoor installation.(SIMILAR TO above image)
Without the tube, I can transmit nearly 300 m ...
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Could multiple transmitters on the same frequency work if phase-locked to GPS? (gedanken)
I've been noodling this concept for a while; it seems to me that if it were actually workable somebody would be doing it already, but I haven't heard of it happening. So where do I go off the rails ...
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PCB8711 Rev. A of Sender 5000 solid-state AM transmitter: schematic symbol
I wonder what the symbol encircled below means, because we're repairing an AM transmitter.
I think the real-life version of that schematic looks like this:
I really wonder what the symbol encircled ...
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I need to build a transmitter/receiver system that can accurately (within 500mm) measure distance between the 2 devices [closed]
A business case has been presented to me and I desperately need advice.
I am searching for technologies capable of providing an approximate (<500mm) distance between a stationary receiver and ...
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Why do we modulate a signal before the transmission? [duplicate]
I have a fundamental question. Why do we modulate a signal before the transmission? What is the obstacle for transmitting a signal in its typical form?
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Remote Control Plane Transmitter Question
More so of a rc plane hobbyist, so never messed with the workings of the receivers or controllers. I am looking to help with the situation in Ukraine. Building long range search rc planes as most of ...
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What is the purpose of the NSBC114EDP6 IC on the TX pin? [closed]
I am trying to debug the circuit above. The transmitter pin from the MCU is connected to the NSBC114EDP6's (SMD marking code 7A) input pin 2, and the output from pin 3 is connected to another MCU ...
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Need a simple way of generating/transmitting roughly 2.4 GHz (unmodulated), ideally at over 20 dBm (0.1 W)
Purpose / Problem
The aim is to track (large) insects, similar-ish to the approach in this paper. In my design I have a series of high-gain transmitters that rotate. The insect carries a device that ...
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Increase input frequency circuit
Referring to this website, this circuit tries to replicate the waveform of the input voltage and turn it into a high frequency, I tried to simulate the circuit in LTspice, but the output is weird. May ...
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Tube AM transmitter question
I designed an AM tube transmitter based on a crystal oscillator. Can you please tell me if this would work, or what I could improve?
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Ground plane radials not improving monopole design
I have a transmitter setup from my router like shown below. The backplane is made from cardboard and has an RPSMA male wire held up in the middle. It is attached to my router.
Goal: design a monopole ...
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What is the role of L1 and L2 in the following ASK transmitter circuit?
I know almost nothing about how oscillators work. Please explain about the operation of the circuit below (ASK transmitter module), especially the inductors.
Is it possible to replace these two ...
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What's the purpose of the band-pass filter in an RF transmitter?
What is the purpose of the marked band-pass filter?
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Chaotic Highpass Filter Output
I'm trying to build an RF transmitter circuit using LTSpice. Built a diode balanced signal mixer connected to a high pass filter to distinguish high frequency from low frequency. However, I'm kinda ...
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Please verify tube AM radio transmitter [closed]
I am an electronics hobbyist. I designed this tube AM transmitter circuit. I want to ask you, since it's my first designed circuit, if it will work, and if I can improve it.
I am using a PL500 for the ...
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How to flash memory when there is no sector information?
Currently, I am trying to flash WCT1013A. As I see in the datasheet there is no sector information. If I do not know about the sector information how am I going to flash the memory?
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Allow 12v power through when RF transmitter is close
I'm currently working on a project to allow 12v power through when a RF Transmitter is within a 20 foot range and shuts off then the transmitter is out of range, I'm not so concerned about the range ...
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How to design RF Matching circuit for Transmitter MCU (BC66F2245)?
I am designing a PCB where i use the Holtek BC66F2245 Transmitter MCU to send data using RF at 433MHz. I'm currently drawing the schematic in Altium and now i've come to the point of designing the ...
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Convolution between bit stream sampled by N number of samples per bit with a channel modeled as low pass filter
I generated a bit stream in MATLAB, from the transmitter to be convoluted by the channel
I use MATLAB function "randi" between 0 & 1, so it generates random vectors of 0s & 1s and ...
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FM transmitter not giving the intended output of 88MHz to 108MHz
I am trying to build an FM transmitter that outputs 88MHz to 108MHz range using Multisim, but the circuit I constructed gives a lower voltage and lower frequency at the output according to the ...
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The relation between data bandwidth (BW) and BW of the local oscillator of a transmitter
Say we have some sort of data we want to send by means of a transmitter having a local oscillator as its carrier. The local oscillator can simply be realized by a phase locked loop with a certain loop ...
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How would I make a wireless pressure switch for turning on and off a flash light?
I want to make a wireless pressure switch for a flash light mounted on an airsoft gun
I have figured out that I would have to use an RF transmitter/receiver like this one:
https://www.amazon.com/3-7-...
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How is our voice tone transmitted and received without the change of our own voice?
For example lets take mobile communication, transmitting and receiving what we speak is fine, but how does it retains different flavors of our unique voice (that is if someone who we knows speaks over ...
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Noob DIY Bluetooth Soldering Question
I need your help to convert my earphone with boom mic to Bluetooth using this transmitter receiver. The problem I am facing is that once connected this device does not use the boom mic rather built in ...
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Is this radio receiver/transmitter plausible?
Previously I have created a simple radio receiver using the schematic below (based off a crystal radio), and I was wondering if the modified circuit which is also below would work for a simple morse-...
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Ethernet maximum current
Is there a maximum current Ethernet receivers and transmitters need to withstand? I haven't found anything regarding that topic
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NPN transistor with no resistance at collector?
I'm trying to work my way through a pretty simple laser-based communication system (full description here) project I found online, just as a learning experience.
I'm having issues understanding the ...
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Industrial PT100 temperature transmitter and ESP32 with micropython
I'm building a temperature controller using ESP32s and industrial PT100 temperature transmitters.
The transmitter I'm using is this:
MUR-HS-U
It has selectable temperature ranges and outputs 1-10V ...
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How to create an RS485-compatible line driver with an adjustable slew rate?
I need to make an RS485 compatible line driver, capable of 12Mbit/s with fast slew rate, but with the capability to reduce the slew rate to about 50ns rise/fall time when operating at lower bitrates.
...
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Spurious measurements FCC
I was wondering if someone can help me with a project at work. I am very very new into RF.
I work for an EMC/EMI lab and we want to do some spurious emissions testing and establish a test procedure ...
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