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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1 answer
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Transmiting analog signal with lora

I want to transmit an analog signal over Frequency Modulation with a Lora RA 02 module. First thing I need to do is convert the analog signal from the audio source to digital, right?. But I had so ...
0 votes
1 answer
86 views

Anyone have any idea what type of receiver/transmitter that is

I got those from someone and it does not come with any kind of datasheets I’m guessing they are receiver and transmitter as they both have kind of an antenna.. anyone have an idea of the model so I ...
0 votes
1 answer
86 views

How does pulser-receiver circuit work

I want to set up an experiment exactly as given in this data sheet for the T/R switch that I recently bought (the MD0101): Every pulser receiver circuit that I’ve found neglects to address what ...
1 vote
1 answer
89 views

Is it possible to induce few volts IMPULS over 10 m distance?

I'm currently learning about electromagnetism at college, so this question is on mine mind for a few weeks. If we have on one side: 9 V battery, DC-DC converter to few kilovolts, capacitor, button, ...
0 votes
2 answers
321 views

433 MHz transmitter works only when I touch a specific part

As it is hard to describe, I made a small video showing my issue: https://vimeo.com/521857517 As you will see, the RF transmitter and receiver are correctly connected as they work when I touch a ...
-1 votes
1 answer
45 views

Transmitter & receiver circuit for high voltage lights

I want to control my room's lights by wireless circuit - like RF or whatever. In my country, the lamps and lights work on 220V AC. I'm still beginner, I have done this before and it worked, but by ...
0 votes
1 answer
203 views

SAW resonator oscillator operating principle

I can't for the life of me figure out how the following SAW oscillator works. I can't see how the oscillation would be maintained since it doesn't use a feedback mechanism I'm familiar with. This post ...
0 votes
2 answers
90 views

FM modulation in FM transmitter

I'm using an LM386 for voice amplification. The transmitter transmits the signal from the tank circuit on the correct frequency but without voice. I'm a beginner and a hobbyist and I'm still trying to ...
1 vote
1 answer
80 views

Small wireless transmitter and receiver [closed]

I am looking for suggestions for wireless transmitter/receiver chips/circuitry. I have the following system in mind: Multiple transmitters to one receiver Transmitters do not have access to ...
2 votes
2 answers
1k views

Tube Transmitter Issues

I'm back working on my friend's 807 tube transmitter. I've had some previous posts on this and I'd like to thank all the people who responded for your help! I bought an oscilloscope and a dummy load ...
0 votes
2 answers
182 views

Designing mil-std-1553 transceiver [closed]

I need to design a mil-std-1553 analog front end transceiver to already designed digital 1553 ip for my ms thesis. So I need to convert digital 3.3V to analog specs level and receive and convert to ...
1 vote
4 answers
786 views

How can this 160MHz VHF locator tag work with such small antenna?

I recently came across a VHF locator tag used to find animals in the field. It operates on the 160MHz band. According to the user the locator range is some km line of sight (using Yagi antenna) and ...
0 votes
1 answer
117 views

How is the Tx/Rx Gain calculated in USRP?

I'm using Software Defined Radio NI USRP 2922 (Universal Software Radio Peripheral). I know that USRPs are uncalibrated devices. In many exampls you can set the so called Tx or Rx gain (as in the ...
1 vote
4 answers
309 views

FM Transmitter oscillation problem

I've been trying to get this simple FM transmitter to work over the past few days and I could use some help in a few areas. First iteration was on a breadboard with all parts included. The ...
7 votes
3 answers
1k views

How does someone design a low frequency FM radio transmitter?

I'm relatively new to the topic but I'm intending to transmit some data from a measurement system in a cave to a receiver on the surface. I understand that I can use a SDR (software defined radio) to ...
0 votes
4 answers
249 views

simple way to send addressable RGB signal wirelessly [closed]

So my electronics knowledge is pretty limited, But I'm hoping there is a simple way to do what I want. Also I'm sorry if this question is answered somewhere else as I'm probably not using the right ...
-1 votes
2 answers
171 views

What makes it hard to build a powerful RF transmitter?

I was looking for a powerful RF transmitter lately but I didn't find many. They are low power (< 0.5W) or expensive. I have a little understanding of a regular 433MHz transmitter's schematics. It ...
0 votes
1 answer
99 views

Where can I find how to use those rf transmitter/receiver

I bought those rf trans/receiver (GWB T400) I figured out that the sck, miso and mosi are for the spi communication. Gnd and 3v3 are pretty clear as well but I’m not sure what rst and cs are for. I ...
0 votes
1 answer
76 views

RF help, difference between using 12V and 5V as power supply voltage

I am currently looking into building a custom RF transmitter. The commercial ones built for Arduinos usually operate at 5V. I was also looking into some RF remotes, and found that they usually use 12V....
2 votes
1 answer
122 views

Help identifying encoding scheme for RF device

I have this RF encoder that I am trying to customize with an MCU. The remote control device uses an encoder called HS2260. I believe it is a clone of PT2262 device. I was able to get the waveform but ...
7 votes
3 answers
9k views

What is the advantage of differential Manchester

I can see the advantage of Manchester code over NRZ: you get clock and data in one signal combined. But what does differential Manchester add to that?
1 vote
4 answers
981 views

What are the basics I need to know to power LEDs with RF at a range of 30 feet?

I would like to light up a path in the woods with hundreds of LEDs using RF. The idea is that I would carry a RF transmitter powerful enough to light LEDs. As I approach the LEDs would get brighter, ...
1 vote
1 answer
60 views

Formula to calculate the isotropic range of a signal

I am wondering, is there a formula to calculate the range of a signal with a given frequency and output power? For example, how do i find the range of a 580khz AM signal on entirely flat terrain with ...
1 vote
1 answer
269 views

Rc Transmitter not working

Trying to fix an old transmitter from some rc toy, I may have removed the crystal oscillator some 4~5 years ago so I can only guess it was either 27Mhz or 40Mhz. I tried 27Mhz crystal oscillator (I ...
5 votes
1 answer
1k views

Difference between ultrasonic transmitter sensor and ultrasonic receiver sensor?

What is the difference between ultrasonic transmitter sensor and ultrasonic receiver sensor? Can an ultrasonic receiver sensor be used as an ultrasonic transmitter sensor or vice versa?
0 votes
1 answer
127 views

Can I increase the signal strength by combining two radio transmitters with an antenna?

Can I increase the signal strength by combining two radio transmitters with an antenna? İt has only one oscillator and two transmitter circuit. Same signal. I connect antenna coil together in one ...
0 votes
1 answer
125 views

TS832 audio-video transmitter lowers its input voltage

I have a TS832 audio-video transmitter, and in its datasheet it says that the operating voltage is typically 12V, but can range from 7V to 16V. I am powering the transmitter with a 9V battery. I am ...
2 votes
1 answer
2k views

How to calculate telescopic antenna impedance?

I'm designing a 27 MHz transmitter for controling RC toy using TX-2B and RX-2B ICs. Thre is my output stage schematic (see attachment). Output impedance 50 Ohm. I know that antenna length on 27 Mhz ...
1 vote
2 answers
321 views

Max load on analog output

I am planning to connect an Omron ZL1-series 4-20 mA level transmitter to a 0-10V input on a PLC. To do so, I have to convert the current to a measurable voltage by connecting a 500 Ω resistor to the ...
2 votes
2 answers
30k 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 carrier signal frequency so that I know where to tune my FM radio? If I want ...
0 votes
0 answers
167 views

Can 4-20mA transmitters send through a 1kOhm resistor?

I have a 4-20mA sensor at work and I wonder if it's possible if a 4-20mA transmitters send through a 1kOhm resistor? I guy I talked to said that 4-20mA normaly can't send through 1kOhm because it's to ...
1 vote
2 answers
114 views

How can I adequately recreate a signal with a biphase line code after band-pass filter in python?

I want to create a python model of a transmitter. The transmitter uses a biphase line code, which looks like this (from a datasheet): Additionally, the datasheet states that the signal is "...
-1 votes
3 answers
130 views

TV remote mystery

My TV remote has this hole. The hole exists for the propagation of the EM waves coming from inside the remote correct? I guess plastic would absorb those EM waves and we don't want that to happen. ...
0 votes
0 answers
58 views

Can't transmit UART signal from Circuit Playground Express to Raspberry Pi witth 433MHz rf link kit

I'm a noob on electronics and I've been trying to send data from a Circuit Playground Express to a Raspberry Pi with a 433MHz rf link kit. I followed a Rasperry Pi tutorial with the rpi_rf.py library ...
0 votes
0 answers
41 views

Is there any applications for short data transmission?

In some applications like IoT, the transmitter turns off for power saving when the transmission is not needed. I'm not sure but I heard that: when the transmitter is on, the data length - in time - ...
0 votes
1 answer
51 views

Need 100base-tx/1000BASE‑TX front end analog scheme

Need 100base-tx/1000BASE‑TX front end analog circuitry, if possible with explanations. I've been searching for a while already but no success. There are only bluffy peices of information. Is it ...
2 votes
1 answer
36 views

Digital Communication \$T_x\$ and \$R_x\$ for Dish - Coaxial Cable - TV Setup

I have a question in mind regarding transmitters and receivers. Let's say we have a dish then a coaxial cable connecting our dish to the TV. Can we consider the Dish as a transmitter \$T_x\$ and the ...
1 vote
1 answer
143 views

My FM transmitter never works, Why? [duplicate]

I'm trying to build a FM transmitter, but without sucess. The current schematic I'm using is this one: The alternating current at the (+) of the op amp is the P2 output of my phone. V3 and V4 are 2 ...
0 votes
1 answer
38 views

Cheapest way to power an LED from an Android phone using Bluetooth [closed]

I recently wanted to make an Android controlled LED using Bluetooth. The obvious solution I could think of is using a HC-05/06 module with an Arduino. However I believe for just lighting an LED, this ...
1 vote
0 answers
61 views

Why does the overshoot exist when transmitter turns on?

I am implementing power amp. with 16-QAM. Because of issue on power consumption, I am using time division duplex (TDD). By TDD, the power amp. turns off if the carrier wave is not needed and vice ...
2 votes
1 answer
164 views

Does this crystal circuit work?

I need a tiny oscillator circuit for testing an application. Now I haven't much experience in creating oscillators so I would like to use this Collpits-circuit: I only need the carrier wave so I ...
0 votes
0 answers
43 views

Double Sideband Suppressed Carrier modulator List

I am using ring modulator for DSB-SC am modulation in a transmitter circuit. Can anyone please tell me about more DSB SC modulator for am modulation? I want to know which one to use where?
-1 votes
1 answer
102 views

EMC test for device with WiFi module

I want to test EMI radiated for a medical device with a WiFi module. This medical device connects to a tablet to perform its function. In the EMC chamber we have a lan and a USB connection outside ...
0 votes
2 answers
546 views

Increasing range of FM transmitter

What things impact to range of FM signal? If I increse length of antenna would signal range increase? I would like to increase the signal range of this project. Is that possible? Do I need more power ...
0 votes
1 answer
52 views

Calculating link budget

I was reading and found that there are different ways to calculate "link budget" and I want to know which one is correct because they are confusing to me. For example, some sources state ...
0 votes
2 answers
301 views

Sending serial data over analog TV coaxial cable (RF-band)

TL;DR: I would like to transfer digital serial data over an existing analog TV cable. How do I do that?   Full Question: In order to transfer some data to a device's control lines remotely, I'm ...
1 vote
1 answer
207 views

DIY colpitts oscillator not oscillating

I am trying to make a FM transmitter. For the oscillator part I picked a colpitts oscillator as it seemed relatively simple and I could get the pretty high frequency needed for FM with it. I built the ...
19 votes
4 answers
5k views

Why are color difference signals transmitted rather than R,G,B signals?

In color television systems back in the early days, people used to transmit color difference signals (Y-R) and (Y-B) along with Y, which is the luminance signal. My question is why are color ...
0 votes
0 answers
42 views

AC servo position flight surface control system [duplicate]

So if a control transmitter is used to set the Pilot's input command signal and a control transformer is used to compare this desired position to the current position and produce an error signal. My ...
0 votes
0 answers
169 views

Which 433MHz transmitter module can be used for battery operated wireless communication having vey low current consumption (less than 5mA)

Im designing a wireless water level controller. The WLC detects water between overhead and underground tank. The transmitter will be situated at each of the tanks. After water level sensing , the ...

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