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
61 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
90 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
750 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
44 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
654 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
85 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
111 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
46 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
53 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
86 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
46 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
88 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
61 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
48 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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2answers
87 views

Max load on analog output

I am planning to connect an Omron ZL1-series 4-20 mA level transmitter to a 0-10V input on a PLC. To do so, I have to convert the current to a measurable voltage by connecting a 500 Ω resistor to the ...
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0answers
88 views

Can 4-20mA transmitters send through a 1kOhm resistor?

I have a 4-20mA sensor at work and I wonder if it's possible if a 4-20mA transmitters send through a 1kOhm resistor? I guy I talked to said that 4-20mA normaly can't send through 1kOhm because it's to ...
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0answers
34 views

How does the DAC function within this circuit? How does the transceiver work in this case?

I have this circuit which I have to study but I don't know how the DAC circuit works when combined with the other components. I understand the functioning of the DAC but not that of the other ...
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2answers
60 views

How can I adequately recreate a signal with a biphase line code after band-pass filter in python?

I want to create a python model of a transmitter. The transmitter uses a biphase line code, which looks like this (from a datasheet): Additionally, the datasheet states that the signal is "...
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0answers
42 views

Can't transmit UART signal from Circuit Playground Express to Raspberry Pi witth 433MHz rf link kit

I'm a noob on electronics and I've been trying to send data from a Circuit Playground Express to a Raspberry Pi with a 433MHz rf link kit. I followed a Rasperry Pi tutorial with the rpi_rf.py library ...
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3answers
116 views

TV remote mystery

My TV remote has this hole. The hole exists for the propagation of the EM waves coming from inside the remote correct? I guess plastic would absorb those EM waves and we don't want that to happen. ...
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0answers
41 views

Is there any applications for short data transmission?

In some applications like IoT, the transmitter turns off for power saving when the transmission is not needed. I'm not sure but I heard that: when the transmitter is on, the data length - in time - ...
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1answer
34 views

Need 100base-tx/1000BASE‑TX front end analog scheme

Need 100base-tx/1000BASE‑TX front end analog circuitry, if possible with explanations. I've been searching for a while already but no success. There are only bluffy peices of information. Is it ...
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1answer
31 views

Digital Communication \$T_x\$ and \$R_x\$ for Dish - Coaxial Cable - TV Setup

I have a question in mind regarding transmitters and receivers. Let's say we have a dish then a coaxial cable connecting our dish to the TV. Can we consider the Dish as a transmitter \$T_x\$ and the ...
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1answer
111 views

My FM transmitter never works, Why? [duplicate]

I'm trying to build a FM transmitter, but without sucess. The current schematic I'm using is this one: The alternating current at the (+) of the op amp is the P2 output of my phone. V3 and V4 are 2 ...
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1answer
36 views

Cheapest way to power an LED from an Android phone using Bluetooth [closed]

I recently wanted to make an Android controlled LED using Bluetooth. The obvious solution I could think of is using a HC-05/06 module with an Arduino. However I believe for just lighting an LED, this ...
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0answers
42 views

Why does the overshoot exist when transmitter turns on?

I am implementing power amp. with 16-QAM. Because of issue on power consumption, I am using time division duplex (TDD). By TDD, the power amp. turns off if the carrier wave is not needed and vice ...
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0answers
39 views

Double Sideband Suppressed Carrier modulator List

I am using ring modulator for DSB-SC am modulation in a transmitter circuit. Can anyone please tell me about more DSB SC modulator for am modulation? I want to know which one to use where?
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1answer
53 views

EMC test for device with WiFi module

I want to test EMI radiated for a medical device with a WiFi module. This medical device connects to a tablet to perform its function. In the EMC chamber we have a lan and a USB connection outside ...
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2answers
205 views

Increasing range of FM transmitter

What things impact to range of FM signal? If I increse length of antenna would signal range increase? I would like to increase the signal range of this project. Is that possible? Do I need more power ...
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1answer
27 views

Calculating link budget

I was reading and found that there are different ways to calculate "link budget" and I want to know which one is correct because they are confusing to me. For example, some sources state ...
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2answers
75 views

Sending serial data over analog TV coaxial cable (RF-band)

TL;DR: I would like to transfer digital serial data over an existing analog TV cable. How do I do that?   Full Question: In order to transfer some data to a device's control lines remotely, I'm ...
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1answer
92 views

DIY colpitts oscillator not oscillating

I am trying to make a FM transmitter. For the oscillator part I picked a colpitts oscillator as it seemed relatively simple and I could get the pretty high frequency needed for FM with it. I built the ...
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0answers
40 views

AC servo position flight surface control system [duplicate]

So if a control transmitter is used to set the Pilot's input command signal and a control transformer is used to compare this desired position to the current position and produce an error signal. My ...
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4answers
4k views

Why are color difference signals transmitted rather than R,G,B signals?

In color television systems back in the early days, people used to transmit color difference signals (Y-R) and (Y-B) along with Y, which is the luminance signal. My question is why are color ...
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0answers
32 views

Multiple CC1101 receivers and senders

I would like to implement multiple receivers/senders with CC1101[1] from TI. Idea is that all receivers are listening for specific commands and do their job, after that if some specific receiver reads ...
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0answers
38 views

Which 433MHz transmitter module can be used for battery operated wireless communication having vey low current consumption (less than 5mA)

Im designing a wireless water level controller. The WLC detects water between overhead and underground tank. The transmitter will be situated at each of the tanks. After water level sensing , the ...
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2answers
81 views

Calculating capacitor capacitance between collector and emitter in radio circuits

In many radio transmitters and receivers there is a capacitor between emitter and collector. As shown in this answer this capacitor gives positive feedback to prevent decay. My question is that, how ...
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0answers
78 views

Short range FM transmitter

I made this FM transmitter from this video (https://youtu.be/joFourugXvs) but it has a very short range (30 cm). Where's my mistake?
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1answer
121 views

How to make the HT12E transmit (TE to low) only when one or both buttons are pressed?

I followed this video: https://www.youtube.com/watch?v=-xK0B_bM-yk and made these circuits: Transmitter: Receiver: And they work as I want them to. I have 2 pushbuttons so when one or both of them ...
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1answer
57 views

pulse transmitter operation

I'm trying to get a better understanding of how this 1.5v pulsing transmitter works. I found it on Youtube and modeled it up with some success. https://www.youtube.com/watch?v=aLS9DsF2ilg The ...
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1answer
72 views

FM modulation, amplitude problem

I'm trying to make an FM modulation with a Hartley oscillator that oscillates at 45MHz. The problem is that it's supposed to have an unitary gain. I can't find a good adjustment between a really low ...
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4answers
158 views

FM Transmitter oscillation problem

I've been trying to get this simple FM transmitter to work over the past few days and I could use some help in a few areas. First iteration was on a breadboard with all parts included. The ...
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1answer
26 views

RF modules flickering

I have an rf transmitter and receive set up on a basic circuit so that when I connective data pin of the transmitter to the 5v, the receiver should detect it and the LED turns off. This mostly works ...
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3answers
227 views

Schematics RF transmitter

I'm attaching a schematic of an RF transmitter made by Synoxo. Chip is the SYN115. The schematic is found in the datasheet. I do not understand why L3 which is the PCB antenna (pointed with the red ...
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2answers
409 views

How to transmit a 125kHz signal?

I want to transmit a 125 kHz signal. The square wave signal is generated by the microcontroller (just transmitting no data and no receiving,) the transmitting and receiving antennas are tuned to ...
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0answers
25 views

What code rate is required for cellular transmission?

I've been doing some reading about various error correcting codes in wireless communications such as Hamming and LDPC. Since there is a trade-off between code rate and robustness, I am curious how ...
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2answers
139 views

AM modulation stage for small transmitter

I am trying to build an AM radio transmitter. I have built a Colpitts oscillator with a 7 Vpp output and an audio stage with a 1 Vpp output. I am trying to build the amplitude modulation stage I am ...
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1answer
44 views

Maximum transmit power allowed for 802.11g

I'm learning about the 802.11 regs. In a book I'm using, "CCNA Wireless 200-355 Official Cert Guide (Certification Guide) 1st Edition by, David Hucaby (Author). Page 53", it has the following clause ...
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2answers
41 views

Fast Ethernet transmitter structure

Does anyone knows internal structure of a typical Fast Ethernet 100BASE-TX transmitter? I wonder how MLT-3 voltage levels are formed and what can cause abnormal voltage levels at the PHY output? ...
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3answers
76 views

In Amplitude Modulation transmission, why do we need to mix (multiply) rather than just add the carrier and base-band?

Why is it necessary to mix the carrier with the message signal to create the sum and difference of the frequencies when you can just add both signal? Not only is it much easier to achieve but it would ...

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