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.

Filter by
Sorted by
Tagged with
-1 votes
0 answers
47 views

Is using an uncertified wireless module legal?

Every radio station must use its own given frequency band. Is using an uncertified RF transmitter (low voltage) module on a drone or remote-controlled car legal?
user avatar
7 votes
4 answers
1k views

What's the purpose of the band-pass filter in an RF transmitter?

What is the purpose of the marked band-pass filter?
user avatar
0 votes
0 answers
89 views

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 ...
user avatar
-1 votes
2 answers
165 views

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 ...
user avatar
0 votes
0 answers
36 views

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?
user avatar
  • 121
0 votes
0 answers
32 views

Power combiner for I-Q signals in a transmitter

I have a transmitter project to implement. Part of the project is to combine an in-phase and an out of phase (90 degree difference) signal with a center frequency at 3.5GHz. I figured I could ...
user avatar
0 votes
1 answer
40 views

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 ...
user avatar
0 votes
0 answers
27 views

RF antenna matching circuit design for 53.4-219.2J load

I recently posted this question about designing a matching circuit for a Holtek BC66F2245, where I transmit data on 433.9MHz using a 50 ohm antenna. I have contacted the developers of the MCU and I ...
user avatar
0 votes
1 answer
72 views

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 ...
user avatar
0 votes
0 answers
26 views

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 ...
user avatar
0 votes
2 answers
87 views

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 ...
user avatar
  • 9
0 votes
1 answer
34 views

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 ...
user avatar
  • 1,734
0 votes
0 answers
35 views

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-...
user avatar
0 votes
5 answers
173 views

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 ...
user avatar
  • 11
0 votes
0 answers
86 views

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 ...
user avatar
0 votes
1 answer
91 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-...
user avatar
0 votes
0 answers
57 views

Ethernet maximum current

Is there a maximum current Ethernet receivers and transmitters need to withstand? I haven't found anything regarding that topic
user avatar
  • 29
2 votes
2 answers
824 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 ...
user avatar
  • 31
1 vote
0 answers
204 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 ...
user avatar
1 vote
0 answers
83 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. ...
user avatar
0 votes
0 answers
123 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 ...
user avatar
0 votes
1 answer
62 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 ...
user avatar
  • 11
0 votes
2 answers
76 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 ...
user avatar
0 votes
1 answer
42 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 ...
user avatar
0 votes
0 answers
87 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 ...
user avatar
0 votes
0 answers
70 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 ...
user avatar
16 votes
3 answers
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 ...
user avatar
2 votes
2 answers
605 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 ...
user avatar
  • 805
0 votes
5 answers
339 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 ...
user avatar
0 votes
1 answer
59 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 ...
user avatar
1 vote
2 answers
270 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 ...
user avatar
  • 87
-2 votes
1 answer
73 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.
user avatar
  • 11
3 votes
2 answers
275 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 ...
user avatar
  • 1,276
3 votes
2 answers
111 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 ...
user avatar
  • 2,424
1 vote
2 answers
172 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 ...
user avatar
  • 33
0 votes
2 answers
55 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 ...
user avatar
  • 81
2 votes
2 answers
212 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 ...
user avatar
0 votes
1 answer
123 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) ...
user avatar
0 votes
2 answers
116 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?
user avatar
  • 81
0 votes
1 answer
39 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 ...
user avatar
  • 13
0 votes
1 answer
78 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 ...
user avatar
0 votes
1 answer
388 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.
user avatar
0 votes
1 answer
77 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 ...
user avatar
  • 1
-1 votes
1 answer
98 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 ...
user avatar
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 ...
user avatar
  • 327
0 votes
1 answer
93 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 ...
user avatar
  • 165
-1 votes
1 answer
46 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 ...
user avatar
0 votes
2 answers
341 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 ...
user avatar
  • 327
0 votes
1 answer
219 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 ...
user avatar
  • 2,495
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 ...
user avatar

1
2 3 4 5
9