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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1answer
68 views

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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0answers
29 views

Infrared transmitter and receiver's LED is not turning on

We recreated this circuit on Youtube, it is an infrared transmitter and receiver We have recreated this circuit in Multisim, but the LED U3 does not light up when we press the S1 button, we assume ...
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47 views

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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2answers
744 views

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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0answers
60 views

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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0answers
68 views

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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0answers
111 views

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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1answer
57 views

General relation between size and maximal transmission distance of a transmitter

Suppose I want to build a transmitter to send detectable signals to receivers far away and still want the transmitter is be small. Is this in general possible? Namely, how would the size of critical ...
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2answers
74 views

How do I wire five pressure transmitters at the same voltage into a DAQ?

I want to collect pressure readings using 5 analog pressure sensors powered by a battery and collected with a DAQ. My sensors require 10 - 36 VDC and draw 38 mA max with 4 - 20 mA output. My battery ...
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1answer
37 views

WiFi Beacon working as BLE Beacon

I had this idea of a WiFi Beacon that works just as a Bluetooth BLE Beacon. I tinkered around with some DIY Bluetooth beacons, like building my own iBeacon for distance measurements. But my questions ...
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56 views

Impedance matching in Transmitter Circuit

Consider the FM transmitter circuit from here (https://eeeproject.com/fm-transmitter-circuit/) with circuit diagram In this question (Antenna in Transmission & Receiver circuits) I was going to ...
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64 views

Help me identify this component in an RF transmitter

This is from a 2-channel RF Transmitter FlySky FS-GT2. I think the antenna's wire should be soldered onto this RF transmitter PCB, flat silver component, however, I do not know where to solder because ...
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3answers
1k views

What is this circuit diagram found on an FM transmitter?

This is the circuit diagram on the transmitter at a local FM radio station I clean at (I'm a janitor,) but I'm also studying electrical engineering. I'm puzzled by the circuit diagram on the ...
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2answers
472 views

Why are pull-up inductors biasing the power amplifier output of radio transmitters chips needed?

I have seen many designs where the antenna/PA output is fed DC voltage through an inductor. Why not leave it out and feed the DC bias directly? It is L1a in the diagram below: There are some values ...
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5answers
187 views

How can I produce dual +-12V supply rails from a single 12V supply?

I designed transmitter and receiver circuitry, with LT1214CN op amps with +-12V rails, and now realized I'm limited to using a 12V external supply (I was asked to use it). I've considered possibly ...
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1answer
55 views

Can I use a BC338 in this application?

I want to build this FM transmitter that runs on 1.5-3V. I've got 2 questions so far: Can I use a 2N2222A NPN in this application? (I think I can but want to double check.) How can I calculate (or ...
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2answers
248 views

How do I transfer this circuit to stripboard?

I want to construct this circuit because it look worth to try. However, I am not sure about connection between the components. This is the components placement that I tried, does it make sense? Please ...
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1answer
56 views

Transmitter adc value with UART

Can the adc value be sent to the computer at a sample rate of 48 kHz real time? I am using STM32F103C8 and this FTDI.
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2answers
229 views

What is the simplest 100km RF communication link there is?

I am looking for a technology for sending sporadic bytes over RF hundreds of kilometers away - assume line of sight. What should I look into to do that? What frequency? What modulation? Perhaps what ...
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2answers
93 views

Backscatter in RFID

I am reading and trying to understand about the RF ID communication. I read that the receiver conveys the binary data back to the transmitter using backscatter modulation. But I find it a little ...
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2answers
135 views

How to build a circuit which allows a piezo transducer to act as both a transmitter and receiver

I am a student and am currently working on a project where I require a piezo transducer to act as both a transmitter and receiver. I am finding it difficult to build a circuit where a pulse can be ...
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2answers
53 views

Power output of a CC amplifier

I've been learning about electronics from the book Electronics Fundamentals, and have just finished the chapter about BJTs. Decided to put the newly gained knowledge to use and designed the following ...
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2answers
172 views

I want to build an FM transmitter. How does this circuit work?

I have been tinkering with AM transmitters but now I would like to build and understand FM transmitter circuits. I came across this circuit in a electronics projects book but it does not explain at ...
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1answer
114 views

How does analog video transmission work in toy drones?

I'm trying to get a big picture understanding of how video transmission works. How is the video transmitted in FPV transmitters like here? In the specs, it says FM. So is the analog video (NTSC/PAL) ...
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2answers
79 views

Output Impedance of a DIP8 Crystal Oscillator

I would like to make a module for OOK transmission using a generic DIP8 Crystal Oscillator, and this is what I currently have. How is the output impedance of a Crystal Oscillator determined?
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1answer
35 views

Unstable Phase of Channel Impulse Response

I'm using DW1000 UWB radio transceiver and extract its channel impulse response (CIR). The CIR output by the transceiver is the complex baseband CIR. In a static environment, the CIR is a LTI filter ...
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1answer
72 views

What's the maximum possible power output of this RF CATV amp?

please tell me what is the maximum possible output wattage that this RF CATV distribution amp (see below for specifications) would likely output with maximum possible input before damage? ~13 mW is ...
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1answer
180 views

Can anyone explain how this 433MHz RF transmitter module works?

I don't know the basic functionality of the circuit and I need a complete description of every component.
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1answer
75 views

Wireless doorbell transmitters and receivers

Im a complete noob when it comes to electronics but have been searching google and havent found anything and was just wondering if any of you can help guide me a little. So I have this set of wireless ...
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1answer
74 views

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 ...
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1answer
83 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 ...
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1answer
49 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 ...
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1answer
42 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 ...
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2answers
241 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 ...
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1answer
146 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 ...
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2answers
85 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 ...
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1answer
78 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 ...
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2answers
143 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 ...
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4answers
770 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 ...
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1answer
82 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 ...
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3answers
916 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 ...
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4answers
183 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 ...
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2answers
157 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 ...
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1answer
72 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 ...
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1answer
69 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....
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1answer
106 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 ...
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1answer
52 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 ...
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1answer
215 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 ...
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1answer
88 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 ...
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1answer
99 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 ...

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