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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307 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
160 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
46 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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1answer
60 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
136 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
133 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
14k views

Creating a home made ultrasound transducer

I don't know how ultrasound transducers (transmitters) are made, is it possible to create a home made ultrasound transmitter with a custom specific range 1MHz or more? If it is not, would a 3D ...
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1answer
99 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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2answers
9k views

Why did my FM transmitter mysteriously die?

I made a little FM transmitter project a few months ago. I used an Arduino, a litle 4-digit serial LED display, a couple of buttons and an FM transmitter component with breakout board I had this put ...
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1answer
203 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
990 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
33 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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0answers
39 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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1answer
56 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
131 views

How to reset / clear IRQ requests in AX5043

Has anyone gained experience with Onsemi's RF Transceiver AX5043?! I'm not able to clear the interrupt request Bits. For example my XTALREADY interrupt is fired immediately after reset and fired again ...
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1answer
4k 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
46 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
435 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
826 views

Can I make this AM Transmitter circuit a longer range?

Our teacher want to make us a long range AM Transmitter. I try to search it on the internet and I found one simple AM Transmitter circuit in YouTube channel Afrotechmods. But I try this and not ...
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2answers
3k views

Boost a weak AM transmitter

I've made this simple AM transmitter: http://makerf.com/posts/fun_with_crystal_oscillators_part_3 The author of this circuit, claims that would be possible to extend the range of this transmitter by ...
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2answers
311 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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1answer
96 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
3k views

What RF transmitter and receiver to buy for long range

I have 3 main questions that I want to know. I mostly worked with computer science but recently I got an arduino to play around with. I also extracted some motors from an old rc quadcopter that i had. ...
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2answers
57 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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1k 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
110 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
1k 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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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
580 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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2answers
389 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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2answers
645 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 ...
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1answer
3k views

How do I sniff this RF Transmitter Gate Opener Circuit?

What piece of hardware am I looking for to observe the transmitted radio signal? Would an oscilloscope come in handy here? is this a 2-channel RF remote, a 3channel RF remote, or something else? My ...
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1answer
393 views

DIY FM Transmitter [closed]

simulate this circuit – Schematic created using CircuitLab I can not find the frequency from an FM receiver... I am not sure for the coils Henries... I tried to make on of my own and I used: 19 ...
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2answers
684 views

Walkie-talkie transceiver [closed]

I'd like to build a set of miniature two-way (half-duplex) radios that operate on the FRS band. It seems that transceivers for this band would be widely available. However I've not been able to find ...
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2answers
63 views

Phase modulation in the polar transmitter

In the polar transmitter, after the I and Q signals are converted to amplitude and phase, where the phase is in the range of -pi to pi, the phase is further differenciated to obtain the change in ...
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2answers
117 views

Datasheet FM Modulator

Hi I want to implement a narrowband FM transmitter and I find all features about power and noise in the FM Modulator datasheet, but nothing about bandwidth. The transmitter will work at center RF ...
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1answer
1k views

Advantages of Heterodyne vs Homodyne

What are the main advantages from a theorical point of view of a Heterodyne transmitter versus a Homodyne Transmitter? I've seen the main difference is the VCO or PLL connected to the Mixer after the ...
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2answers
2k views

315 MHz Reciever/Transmitter Raspberry Pi

I bought a receiver and transmitter (I can't find the link, but it says FS1000A and LR1 315.00 on it). I also have a set of remote controlled wall outlets that operate on 315MHz according to the FCC ...
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2answers
48 views

creating worst-case scenario test environment for wireless

I'm making a project which involves the use of two HM-TRP radio modules. At this time, the only way I can test the strength of these modules is to go out on the street and travel with one unit for ...
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3answers
4k views

Can a RF 433.92 Mhz transceiver communicate to a RF 433.42 Mhz Receiver?

I am working on automating my Somfy Blinds. The idea is to avoid using the remote control which works on 433.42 Mhz and use a simple RF transmitter and an Arduino. The thing is that I can not find any ...
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2answers
9k views

How to find out what radio frequency is being emitted?

Let's say I have something akin to a garage door clicker. How can I discover the frequency and message it sends with no other information on the device? I want to decode this to the electrical ...
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2answers
30 views

Transmitter max output when checking ohms in parallel

To make my question simple and easy to understand I am giving an example below. I have an RTD (platinum 100) which change resistance with increase in temperature, for checking that rtd is showing ...
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1answer
101 views

Why is my RF circuit behaving like this?

I am not an RF engineer but play one at work. I am working in uhf SatCom. In the lab, In order to test two radios communicating over a satellite, I built a small RF circuit out of cots components. I ...
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0answers
52 views

Transmitter design methods using 0201 SMD

I have some experience designing an IOT transmitter (315MHz/345MHz/433MHz) using 0603 SMD parts, but am considering building a transmitter for production using 0201 parts. My question is, what is a ...
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1answer
38 views

Maximum tolerance for a loop trace-antenna's capacitor

While going through the document at https://www.silabs.com/documents/public/application-notes/AN639.pdf I have read from "Figure 13. Loop Antenna Simulated Mag(Zin) vs. CP1" below that even a 2% ...
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2answers
117 views

Choosing hardware for an RF application [closed]

My goal is to build a battery powered RF transmitter that will reach its accompanied receiver through trees, tall grass, brush, and some outside terrain at a reasonable distance (up to a couple miles ...
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0answers
107 views

Reverse Engineering a transmitter circuit

This circuit is from a radio transmitter electric gate keyfob. -> http://www.easygates.co.uk/product_info.asp?ProductID=340 I want to make my own keyfob. How would I go about finding or creating a ...
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1answer
807 views

Unstable output in VT pin of HT12D decoder

Hi everyone, I have been recently working on a RF operated water pump project. For this purpose i bought a RF RX and TX module which has HT12E and HT12D chips as encoder and decoder. The D8 (Dout) ...
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10answers
5k views

Schematics for a simple radio transmitter that can be built only with passive components?

Fantasized in some of the survivalist, post-catastrophic novels, movies or docudramas is the radio built only with handcrafted or scraped components. Beyond the popular appeal of this stories, I ...
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0answers
303 views

Good compact antenna for FM audio transmitter module?

I've been looking at building a short range FM transmitter using this module, the idea is to create a small module that I can integrate into other projects. I'd prefer having the antenna on the same ...