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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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Amplifier for 22Hz transmitter [closed]

Can anyone help me find an amplifier that can amplify 22Hz signal which is to be transmitted to a distance of 25m through a copper wounded antenna...I have tried with a voltage (sine wave) of 9V ...
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1answer
82 views

How to increase range of AM radio waves? [closed]

As a personal project, I made a very simple AM transmitter with an idea from an online tutorial, using a 1 MHz crystal oscillator (plus power source, antenna, breadboard, etc.). However, when using ...
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1answer
74 views

Power transformer question in vacuum tube circuit

I am having trouble wrapping my brain around this power transformer circuit. I must be missing something very fundamental, so I apologize in advance for that. Can someone explain to me why the center ...
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2answers
170 views

Explain this circuit

I know this circuit is an oscillator circuit and it senses another signal of same frequency, but I don't understand the calculation behind it, and the reason for emitter inductor, 3.9k collector ...
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32 views

How do I design a transceiver by combining a transmitter and a receiver?

My current project includes building a transceiver , which uses 144-147 MHz frequency, I/P power 10W and uses FM modulation. I was thinking to build an individual transmitter and receiver and ...
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1answer
51 views

FM Transmitter (Modulator) Circuit Simulation Problem [duplicate]

I've asked my question before, and I am writing this new question with some edits based on my previous problem. I am building a small FM Modulator ( Transmitting ) simulation on (Multisim). I've used ...
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48 views

Can this transitter on 319.5 MHz signal this receiver on 315 MHz?

In my pile of electronics pieces I have a wireless transmitter with this fcc id that supposedly transmits on 319.5 MHz. In the same pile of stuff I have a receiver with this fcc id that supposedly ...
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1answer
17 views

Friis transmission equation (log scale calculation)

I am trying to understand the Friis transmission equation. My scenario: I consider transmit antennas (\$T_x\$) and receive antennas (\$R_x\$) at a distance R [km]. f [GHz], \$G_{T_x}\$ and \$G_{R_x}\$...
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1answer
36 views

4g transmit from a tv antenna to an indoor antenna

We have a TV antenna on the roof, works on 5-2600 MHz. Its cable runs from roof to my room, connected to the TV. I am wondering if I could transmit 4g signal using another antenna, by connecting a ...
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1answer
47 views

How can I make a voice transmitter receiver? [closed]

How can make a system which have two circuit. And one is place at ground floor and another is in roof. We send voice (like call) one from other by pushing a switch and vice versa. It may be wired ...
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2answers
63 views

Need help understanding simple FM transmitter

I made a simple FM transmitter following https://maker.pro/custom/tutorial/how-to-make-an-fm-transmitter and it worked! Now I need some help to understand how. My coil is made of 1 mm copper wire has ...
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3answers
78 views

Why does the voltage induced in the receiver coil of this WPT circuit decrease when a load is added (in parallel)?

The following is a circuit that wirelessly transfers power via inductive coupling. The circuit is supposed to power a 12 V 0.15 A DC fan and a typical smartphone, which requires 5 V DC across it. The ...
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1answer
107 views

Low noise electret mic circuit

i wanna make a FM microphone for my guitar but the problem is that the electret mic itself output a lot of background noise even before amplifying its signal. so obviously i need a preamp circuit ...
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2answers
103 views

How to design and build RF amplifier, that work in 450Khz [closed]

I have a schematic, that is a sine generator and mixer that does AM modulation. How to design and build an RF power amplifier and build a compact antenna. The goal is to transmit signal up to 50 ...
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2answers
105 views

How does this fire alarm system transmit data on two-wire?

In the fire detection industry, analogue addressable systems use control panels and detectors (and devices such as interfaces) which communicate with each other by means of a protocol. What protocol ...
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1answer
57 views

Creating a wireless transmitter/receiver for off-the-shelf siren

Since I oddly enough haven't been able to find a suitable off-the-shelf product that's reasonable priced (less than 50-60 EUR/USD) and somewhat good looking with Google, I'm about to try a small ...
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2answers
190 views

Is it possible to broadcast FM radio up to 500 metres? [closed]

I'm buying FM transmitter 0.2 watt at Lazada to broadcast for my village community at my area. Not a normal small FM transmitter for car or portable low watt (about 10mW-100mW) which broadcast up to ...
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1answer
55 views

need to make a simple burst transmitter [closed]

i am looking to build a simple transmitter that will transmit on 433mhz automatically every 20ms or less. would this even be possible to make? the transmitter only needs to be simple and set off a ...
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1answer
38 views

Locating mobiles/UE by base stations in a cellular system [closed]

After understanding a bit about how actual cellular systems function, I realized that identifying the mobile/UE location is key in assigning the UE to correct base station and thus to guarantee a ...
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1answer
89 views

Transmitter and Receiver antennas in mobile phones

I understand that in old cellular systems where FDD were employed, we used to have same antenna at the mobile phone (User equipment) for transmission and reception.Moreover, a duplexer was used to ...
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1answer
110 views

What is needed link budget? [closed]

Assuming I want to send a signal 1 km away from a 2.4 GHz antenna with 5 DBI gain and recieving antenna of 2.15 DBI gain. What is the minimum needed power at the receiver (not the minimum transmitter ...
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1answer
227 views

Why microwave links on cell towers have high frequency?

Why microwave links are in the higher microwave spectrum (I don't know exactly but I guess it's around 20-40GHz). If by Friis Equation higher frequencies have lower range then why use higher frequency ...
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1answer
149 views

How can a phone transmit the signal back to tower? [closed]

If cellphones have such a low power transmitter (around 200mW for LTE) and also doesn't have directionality then how can they talk back to the tower even though they are so powerful and built ...
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1answer
41 views

Quadcopter RX TX questions [closed]

I'm working on a quadcopter and have some questions about the receiver and transmitter. I'm going to be milling the boards myself and wanted to know what would be a good carrier frequency to use. I ...
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0answers
31 views

Calculating the maximum antenna voltage

Given a transmitter driving 13dBm into a 50Ω load, what is the peak voltage at the antenna connector? By my calculations, 13dBm is 19.95mW. Given P=V^2/R, V=sqrt(P*R). So the peak voltage would be ...
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1answer
56 views

How cell sites work? [closed]

In Mobile communication, how do cell sites communicate to each other to the point when they reach the cell site which is connected to the other mobile phone when I make a call . What is the medium of ...
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1answer
114 views

Fast, cheap, wireless data transmission with Raspberry Pi [closed]

I need some advice on a project. I want to wirelessly transmit packets of data from a Raspberry Pi to several microcontrollers (Arduino or other). The frequency must be at least 15 packets/s per ...
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2answers
97 views

RF range at 169 Mhz

I'm planning a sensor network for agriculture (that apparently doesn't exist yet in this form) and I'd like to understand the possibilities of the radio link. A good number of in-the-field soil ...
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1answer
94 views

Temperature sensing bee hive

I am a honey bee researcher and I want to build a temperature sensing system to monitor the temperature changes in the three dimensional space within the hive body using 5 sensors on each hive frame (...
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1answer
154 views

Effective area or effective aperture of antenna

The effective area simply represents how much power is captured from the plane wave and delivered by the antenna. The explanation begins oft with assumption that antennas have the same polarization. ...
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2answers
514 views

calculating maximum transmission distance of radio module based on dbm and open air

I own several HM-TRP TTL FSK radio modules, and every time I turn one on, it reports it as being version 2. Anyways I did read the manual and it has a setting for transmitter power as follows: <...
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1answer
32 views

Can a bilateral switch block transmitter interference and can my board still produce great audio?

I made a circuit in which an ISD1760 chip outputs music via an LM386 IC and I like the quality and volume of sound, however, when I run an HM-TRP transmitter on the same circuit board and the ...
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38 views

Weird waveforms for a transmitter circuit

My book about digital logics ("Digital systems" of Ronald Tocci) provides a waveform which seems illogical to me about a transmitter circuit. This is the diagram of the circuit: The inputs for the ...
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103 views

AS3932 LF Wakeup Receiver's wake pin never goes HIGH

I've been working on getting the AS3932 3D Low Frequency Wakeup Receiver to work i.e. making the wake pin go High when a 125kHz OOK signal is interfaced with the channel one pin of the input antenna (...
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1answer
47 views

Private star network topology on Sub-1GHz

I have a project which there is a need to be implemented many sensor nodes in a star network topology. One collector-gateway and multiple transmitters. The farthest sensor node from the "collector-...
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1answer
1k views

How can I modify the frequency of a simple 433mhz transmitter module?

How can I change the frequency of a simple RF transmitter? These are the transmitters in question: Background Research On this question s3c says: To change ...
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1answer
44 views

Capacitors and resistors shown as OPEN and SHORT in Schematics design

I am designing a wireless power Transmitter circuit and mostly following this datasheet for Wireless transmitter IC :- http://rohmfs.rohm.com/en/products/databook/datasheet/ic/power/...
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1answer
212 views

What is mean by channel inversion in wireless communication

Regarding the title of the question, to my understanding, Channel Inversion means that "The transmitter adapts its power to maintain constant SIR at the receiver." It is a technique used for ...
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2answers
174 views

Sending analog signal over twisted pair in noisy enviroment

I need to transmit several analog signals from one board to another (maximum 1m distance) in a very noisy environment (power electronics converter operating at 20kHz). The range of frequencies of the ...
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135 views

Simulation of Qi Communication Signal in LTSpice

I try to simulate the communication signal between transmitter and receiver in LTSpice (Wireless Charging Qi). For this I realized on the transmitter side a full bridge (Input 12V), which is operated ...
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1answer
85 views

How to match two clock signal's phases which are physically apart in two locations?

Suppose, I have one Tx and one Rx physically separated by the long distance with clock signals CLK1 and CLK2 as shown in fig. (say both of 50MHz). I wish to align them in phases. By that I mean, ...
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2answers
54 views

could I just add a microcontroller or timer to this transmitter circuit to turn it on and off so that it lasts longer?

I am thinking of making my own UHF tracking transmitters for a wildlife study. Could I just connect a low power microcontroller to the Vcc part of this circuit http://www.instructables.com/id/Tiny-...
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2answers
804 views

FM Transmitter Power and approx Transmission Distance Calculation [closed]

I am a beginner of electronics and mostly fascinated by hobby circuits right now. I do not have any Electronics Degree. Internet and hobby Electronics books are the only places where I learned lill-...
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1answer
75 views

Purpose of L2,L3 & C6 in the following CW transmitter circuit

I have been trying really hard to understand the purpose of L2, L3 and C6 in this CW transmitter, especially L3 and C6. I have received many conflicting answers such as that L3 is acting as a ...
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2answers
856 views

FM modulation with crystal oscillator [closed]

I have seen many posts where a simple AM transmitter can be made with a crystal oscillator and modulation transformer. Can this idea somehow be modified to FM. I don't want people to misunderstand me. ...
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2answers
399 views

Is it possible to make a coil-less simple Shortwave Receiver

I am really a newbie here in Electronics and I'm into it as a hobby/passtime. I was going through this simple coil-less Shortwave Transmitter circuit on a blog. Q1 – BC548, X1 – 10.7 MHz ceramic ...
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1answer
2k views

Optical audio transmitter can't handle speech

This is a question relating to my project on an optical audio transmitter. I wired up a very simple device in which I use an audio signal transformer (EI14) to modulate the intensity of a laser beam (...
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2answers
281 views

433MHz receiver compatibilty

Currently I have a setup where a 433MHz Transmitter sends a number from one arduino and a 433MHz receiver picks it up for another arduino. The Transmitter and receiver are of the Super Regenerative ...
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3answers
98 views

Improving the quality of an optical audio transmitter

I wired up a very simple device in which I use an audio signal transformer (EI14) to modulate the intensity of a laser beam (a cheap 650nm, 5mW diode) according to the audio output of my phone. The ...
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2answers
432 views

Understanding the Michigan Mighty Mite

I'm quite interested in this rather simple transmitter design called the Michigan Mighty Mite, described here: https://makerf.com/posts/mighty_simple_shortwave_transmitter I'm familiar with resonant ...