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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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Piezo tr switch no echo signal

I set this circuit to use piezo as transceiver. I can perfectly transfer the transmitter signal (10 burst pulse) but as transmitter still connected onto piezo , any reveived signal is disappears. When ...
ali demir's user avatar
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0 answers
44 views

Impedance matching T/R switch

I do drive a piezo as transceiver. My transmitter provides square burst around 10Vpp which is too big for simply switching through a diode by dc biasing. I found out that bridge rectifier structure ...
ali demir's user avatar
-2 votes
1 answer
66 views

Transmitter parasitic drainage [closed]

I have a RF cordless calling/alarm bell which works on batteries. The receiver works with 3x AA batteries and its transmitter works with a 23A (12v) battery. The product works with their function. The ...
Kokachi's user avatar
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2 votes
1 answer
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does rf remote transmitter power affect solenoid strength

Remote-control nestbox (bird) trap design calls for one 9V battery (pack with switch) boosted to 12V with MT3608 module to power 12V 433Mhz RF remote receiver, which is connected to a ZEY1-0530 ...
moabird's user avatar
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1 vote
0 answers
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How to match RF transmitter (EV1527) and receiver (SYN470) together?

I have a transmitter that uses EV1527 encoder IC in 433 MHz. Here I want to make a receiver by SYN470. In this case, I am amateur and I do not know how to match transmitter and receiver together in a ...
Saeed's user avatar
  • 27
6 votes
2 answers
329 views

Are my power calculations on this MOSFET Power Amplifier accurate?

Thanks to the help of electronics.SE, I've designed my first power amplifier, intended for transmitting CW on 7 MHz. Before I order parts and build it, I'd request a design review. One important note:...
SRobertJames's user avatar
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1 answer
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Problem to transmit data using FS1000A

My circuit have 4 simple parts. Input voltage is 14.5 so I use two regulator 7805 and 7809 to power supply boards. I use 7805 for WeMos D1 mini (clone) and 7809 to supply power of FS1000A (max input ...
math deaman's user avatar
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3 answers
100 views

Amplitude modulation problems

I am trying to do amplitude modulation using a diode, but my circuit will not work. This is the circuit I am using: simulate this circuit – Schematic created using CircuitLab I don't know why ...
Marcus Marchese's user avatar
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Extending load cell wires for weight transmitter connection

I have a load cell that I want to install in a certain location. I plan to connect its output to a load cell transmitter, which is approximately a meter away from the maximum length of the load cell ...
Aamir Awan's user avatar
1 vote
1 answer
91 views

Designing FM Transmitter [closed]

I am a student and I want to learn how to practically design a FM Transmitter circuit, I have this circuit here and I would be grateful if someone could tell me how to calculate and select all the ...
copperwire's user avatar
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68 views

How do the currents induced by the E-field and H- field flow? Which of the two currents induced by E or H has the larger amplitude?

I came across this problem for an exam preparation question, which I am struggling to answer. Consider a sphere made of thin metal, with a radius of 1 m, at 20 km distance from an AM transmitter ...
HAPU's user avatar
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1 answer
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Why would a UART only transmit the first character and then stop?

For some context I'm using a STM32H7A3 chip: reference manual With this UART and pin configuration: ...
ultraturbonoob's user avatar
-1 votes
2 answers
153 views

Where is the transmit power of antenna in RF circuit schematic calculated?

I want to measure the transmit power of my AM modulated RF circuit. Below is the RF circuit from LTSpice. Should the power be calculated at nodes R5 or C3? Which node can serve as an antenna? The ...
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0 votes
2 answers
117 views

How does this ultrasound transmitter work?

Can anyone explain each component and why it is used? Why Q dash used instead of Q from IC 74121? why .1 nad 47 microfarad used? how the 0 to 9V and 0 to -100 V obtained? reference site https://www....
Abhiram MH's user avatar
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1 answer
66 views

USRP B200 sample rates

What are the possible sample rates for both transmit and receive on the Ettus USRP B200 mini ? This SDR uses the AD9364 chip. Does the radio use integer divisors of the master clock rate? Or does it ...
BigBrownBear00's user avatar
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1 answer
37 views

One vs Two Omnidirectional Antenna - Transmitter

I am looking for the best line of sight range for a 5.8GHz video transmitter on an aircraft. Options are one or two omnidirectional transmitting antennas. Max transmitting power will go to a single ...
user362693's user avatar
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0 answers
53 views

Bluetooth transmitter headphone jack soldering points

I am in the process of modding a 7th gen iPod. I have purchased a Bluetooth transmitter/receiver from AliExpress (VALORO 2 IN 1 transmitter) andtaken the PCB out. Noe I am unsure what points to solder ...
ArrakisHackvist's user avatar
2 votes
1 answer
121 views

Calculate the output IP3 of this transmitter

The following is a tutorial question from my teacher. A transmitter requires the IM3 products to be -65dB below the main tones when the total output power is 20 dBm. Calculate the output IP3 of this ...
kile's user avatar
  • 907
4 votes
3 answers
990 views

How small can a spark-gap transmitter be made?

How small can a spark-gap transmitter be made? Wikipedia's got plenty of pictures ranging from "desk-sized" to "room-sized", but those are mostly either early, inefficient ...
Mark's user avatar
  • 841
1 vote
1 answer
155 views

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 ...
Michal Podmanický's user avatar
0 votes
1 answer
63 views

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 ...
Reinderien's user avatar
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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 ...
Zunuran Nasrullah's user avatar
0 votes
1 answer
58 views

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 ...
fraghotmailcom's user avatar
0 votes
1 answer
352 views

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 ...
LEXOR AI's user avatar
  • 346
1 vote
1 answer
178 views

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 ...
nehfan's user avatar
  • 21
1 vote
2 answers
190 views

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 ...
Aditya Chugh's user avatar
0 votes
2 answers
279 views

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 ...
Marcus Marchese's user avatar
0 votes
2 answers
151 views

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 ...
Golf32Charlie's user avatar
1 vote
0 answers
51 views

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 ...
Luca's user avatar
  • 11
0 votes
1 answer
349 views

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 ...
Sal's user avatar
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0 votes
0 answers
49 views

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, ...
Dan's user avatar
  • 13
0 votes
2 answers
82 views

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 ...
user avatar
0 votes
1 answer
101 views

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 ...
ChuckE's user avatar
  • 1
1 vote
1 answer
119 views

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 ...
Daniel Van Antwerp's user avatar
1 vote
1 answer
1k views

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 ...
McMurdo's user avatar
  • 117
7 votes
5 answers
2k views

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 ...
Jesse's user avatar
  • 235
0 votes
2 answers
55 views

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 ...
Jeffrey's user avatar
  • 101
0 votes
3 answers
1k views

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?
Mohamed Essam's user avatar
1 vote
0 answers
82 views

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 ...
chamroeun bm's user avatar
0 votes
3 answers
658 views

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 ...
Crash Gordon's user avatar
  • 1,278
0 votes
3 answers
77 views

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 ...
Shobeh's user avatar
  • 27
2 votes
0 answers
91 views

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 ...
Frankie Mermad's user avatar
0 votes
1 answer
246 views

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?
mohammad rezza's user avatar
1 vote
0 answers
39 views

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 ...
vipr08 's user avatar
0 votes
2 answers
64 views

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 ...
anbu b's user avatar
  • 127
3 votes
2 answers
252 views

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 ...
lionfish's user avatar
0 votes
1 answer
169 views

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 ...
jessica smith's user avatar
2 votes
0 answers
192 views

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?
George Chita's user avatar
0 votes
1 answer
121 views

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 ...
Saveer Jain's user avatar
-5 votes
1 answer
783 views

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 ...
Mahdi Masoodi's user avatar

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