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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28 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 ...
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1answer
39 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 ...
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102 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.
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1answer
68 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 ...
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1answer
47 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 ...
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1answer
76 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 ...
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1answer
32 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 ...
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1answer
41 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 ...
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2answers
106 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 ...
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1answer
70 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 ...
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2answers
68 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 ...
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1answer
72 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
91 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
759 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
51 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
691 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
88 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
115 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
49 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
55 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
89 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
47 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
109 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
67 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
61 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
104 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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101 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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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
63 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
118 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
35 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
32 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
113 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
37 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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43 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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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
57 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
269 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
29 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
95 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
104 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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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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34 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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48 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
82 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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83 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
150 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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