Questions tagged [receiver]

A receiver is any electronic device that receives an external signal (e.g., radio, electrical or optical) and converts the information carried by them to a usable internal form.

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Which noise sources dominate in a receiver?

For a radio receiver that digitizes over-the-air RF signals (such as an SDR), my assumption (as a DSP guy; pardon my hardware ignorance!) has been that thermal noise dominates total receiver noise, ...
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How to determine the radiation pattern of a receiver antenna

I am designing a receiver antenna for a wireless power transfer application. The transmitter is a 2m x 2m horn antenna array that transmits a power signal at a frequency of 35 GHz from 100 meters away ...
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Receiver circuit design testing

I am trying to make a receiver circuit that is able to receive an LED input (further down the line receiver input from a laser). Firstly, I am trying to test the photodiode that will be used. I am ...
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What is the recommended Amplifier/Receiver (AVR) for my Surround Sound 5.1 Speakers Configuration?

Here are my speakers & subwoofer configurations, wondering if anyone can help me suggest a minimum AVR configuration I should go with: I am looking at Harman/Kardon or Denon AVRs. Little back ...
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1 vote
1 answer
137 views

VCO generating a lot of electrical noise, picked up by ultrasonic transducer

In my setup, I have a VCO CD4046 Phase Locked Loop IC generating a square wave, and an ultrasonic transducer set that transmits and receives that setup. You can imagine it looking something like this. ...
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Offsetting an ultrasonic receiver's signal for an amplifier with a floating ground

I have an ultrasonic receiver that I'm putting through an amplifier. I've created a floating ground for the amplifier (because I want to pretend having a negative voltage supply). However, to achieve ...
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How would I make a wireless pressure switch for turning on and off a flash light?

I want to make a wireless pressure switch for a flash light mounted on an airsoft gun I have figured out that I would have to use an RF transmitter/receiver like this one: https://www.amazon.com/3-7-...
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0 votes
1 answer
42 views

Photo Diode Receiver

I have designed a 5KHz Photo Diode Receiver circuit that Consists of a number of blocks. first stage of this circuit is a TIA. I have problem with DC IR Light (Like SUN Light), when sun light shine on ...
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1 vote
1 answer
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Estimating Received Signal Strength of a DTV transmitter

Goal: Estimate the received signal level in dBm (where 0 dBm corresponds to 0.224 volts) on a spectrum analyzer for a given TV transmitter. Scenario: I have many details on the transmitter, including ...
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5 answers
171 views

How is our voice tone transmitted and received without the change of our own voice?

For example lets take mobile communication, transmitting and receiving what we speak is fine, but how does it retains different flavors of our unique voice (that is if someone who we knows speaks over ...
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Noob DIY Bluetooth Soldering Question

I need your help to convert my earphone with boom mic to Bluetooth using this transmitter receiver. The problem I am facing is that once connected this device does not use the boom mic rather built in ...
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1 vote
1 answer
75 views

How does a phase shift keying receiver detect when a new incoming modulated signal is at the input?

This is not a math question. What I want to know is the physical implementation of the receiver where phase modulated signal is coming to the receiver. How does the receiver decide when the phase ...
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1 answer
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Is this radio receiver/transmitter plausible?

Previously I have created a simple radio receiver using the schematic below (based off a crystal radio), and I was wondering if the modified circuit which is also below would work for a simple morse-...
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1 vote
0 answers
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Optical Receivers and Amplifiers

I have been doing some past papers for a university module I am studying. I am not from an electrical engineering background so don’t really know how to attempt the question attached. I would really ...
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2 answers
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Advantages of I and Q receiver over "real" signals receivers

I wanted to know better which are the main advantages of using an I and Q receiver like that: rather than a simple demodulator whose output is a real signal like that: Here some advangages are ...
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Using the earth pin on a power outlet as the earth for a crystal radio

Would there be a way to safely use the earth pin from a power outlet as the earth connection for a crystal radio?
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Ethernet maximum current

Is there a maximum current Ethernet receivers and transmitters need to withstand? I haven't found anything regarding that topic
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Antenna Coupling via Capacitor 4: Calculation of Q of 'by hand'

Consider following coupling of antenna to a LC-tank via coupling capacitor C1 and on the right the replacement circuit of the antenna: I have become aware of a serious knowledge gap of mine with ...
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-1 votes
2 answers
74 views

Alternatives to a monopole antenna for a crystal set

In my last post, @Andy aka recommended that I use a 100 ft (30 m) tall monopole antenna for my crystal set (see diagram below; it has a frequency band of 890 - 1453 kHz). However, I don't have the ...
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Radio receiver for car keys

I'm not sure if this question is ok to ask here but I'm hopeless in finding sufficient hardware for it to be done. I have two pairs of keys to the car and one of them stopped working so I want to ...
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Touching the antenna of a crystal set

I built the crystal set shown in the diagram below and I find that the signal it receives is clearer when I touch an uninsulated part of the aerial (i.e. the node labelled "green" on the ...
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Antenna Coupling via Capacitor 3

This question appears at first glance to be almost identical with this one Antenna coupling via capacitor but I think that in the following case the involved coupling capacitor might play a different ...
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-1 votes
1 answer
63 views

why use not gate to build driver and receiver [duplicate]

I am reading the book Digital Design and Computer Architecture. In this book, it describes logic levels that map of a continuous variable onto a discrete binary variable. and it introduces two gates ...
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Antenna coupling via capacitor 2

I would like to clarify following detail I still not understand so far on the explanation what's the proper purpose of the coupling capacitor C1 in following receiver circuit is (found in http://...
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0 answers
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Consequences of having an external signal connected to an output of a LVDS Receiver?

I am trying to debug an issue with an LVDS receiver on a fellow colleagues board. They are using an LVDS differential pair from an FPGA to control a reset line on a MPU on their board. For debugging ...
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4 answers
171 views

Difference between tuning and matching for transmitter/receiver circuits

I would like to find a coherent answer to following question: What is precisely the core difference between tuning and matching in HF electronics, especially in design of transmitter/receiver circuits?...
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2 votes
2 answers
183 views

Q factor of antenna in receiver circuits

I have a quite broad question about the significance of the Q factor (and especially that one of the antenna) in receiver circuits. Say we have an abstract receiver consisting of an antenna and the ...
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4 answers
436 views

Antenna coupling via capacitor

Assume we have following section of a more or less elementary receiver circuit consisting of an resonant circuit L1 & C2 and an antenna coupled via capacitor C2 to the resonant circuit (source: ...
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-1 votes
2 answers
82 views

Coupling capacitor to receiver antenna

What is the relevance of the left 470pF capacitor coupled to the receiving antenna in this circuit (here the site where I found it):
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1 answer
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Why is my clipping circuit involving 1N5819 Schottky diodes in my radar receiver not working?

I have built the circuit shown below and been testing it on a breadboard. Everything works except the positive half clipping circuitry. I need it to clip after 3.3V. It currently just clips below 0V, ...
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0 votes
1 answer
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NOAA satellite RF superhet receiver - local oscillator frequency precision

I am currently designing a RF receiver for the APT protocol in order to collect NOAA weather images. This has been widely done on the internet, but I'd like to do it from scratch and not use any SDR. ...
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8 votes
2 answers
426 views

What is the reason behind the wiring of the IF tapped transformers in these AM superheterodyne receivers?

I'm going through R.Quan's book "Build your own transistor radios", and I'm triying to build one of his simple AM superhet receivers. Since it offers many working schematics, the book is ...
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3 votes
2 answers
259 views

What is the simplest 100km RF communication link there is?

I am looking for a technology for sending sporadic bytes over RF hundreds of kilometers away - assume line of sight. What should I look into to do that? What frequency? What modulation? Perhaps what ...
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1 vote
2 answers
158 views

How to build a circuit which allows a piezo transducer to act as both a transmitter and receiver

I am a student and am currently working on a project where I require a piezo transducer to act as both a transmitter and receiver. I am finding it difficult to build a circuit where a pulse can be ...
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1 answer
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Antenna as part of deformed circuit

I have a basic question on my rudimental understanding on antennas. In this discussion or more precisely according to this answer essentially an antenna can be regarded as a part of deformed LC ...
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0 votes
0 answers
91 views

FM receiver With LM386 - Need a Preamplifier

I am building a hoppy FM Receiver and I created the Preamplifier stage 1 and linked it with the LM386 Stage and it goes OK but The output sound from the Speaker is weak so I tried to do some ...
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2 answers
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Use Tx port on SDR for an LO?

Designing a receiver for an experiment. The receiver will be in remote location and I will be deploying multiple in the field so have a cost-effective, self-contained system is a priority (is it ever ...
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2 votes
1 answer
76 views

What would this receiver be called?

I'm looking at a phase measuring system that uses an amplitude limited version of the received RF signal as a local oscillator to down convert the signal. I've been trying to find a name for this ...
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1 answer
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What dimensions would L1 in this 433MHz tank circuit receiver be if it is actually 1.5 turns?

Specifically, this circuit from Elektor: The asterisk denotes that L1 in this 433MHz receiver circuit would be 1.5 turns. If that is accurate, what would the dimensions of the inductor air core be? ...
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0 votes
1 answer
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Power limiter purpose in a receiver

let's consider the following blocks diagram for a receiver of a pulse RADAR (but I suppose my question regards many kinds of receivers) My book says that T/R Lim means a power limiter which is ...
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How can I read the data of all nodes at the simultaneously with LoRa

assume that we have 4 e32 433T30d nodes we are measuring temp and sending to a center point. as a image atteached. I am using arduino. I am using this library with arduino https://github.com/xreef/...
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5 votes
3 answers
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Can an LED be used as a receiver and as an emitter?

I have this idea but I do not know if it makes sense. The idea is to use a red transparent LED connected to an input of a microcontroller. In parallel it is also connected to an output of the same ...
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-1 votes
1 answer
77 views

400Mhz frequence HackRF One

All, Sorry but I am new to this topic and have no experience with SDR myself.First, I briefly give the hardware that I am using: HackRF One Following antenna: https://zsecurity.org/product/atheros-...
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0 votes
1 answer
37 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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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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1 vote
1 answer
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Can a non-modulated / continuous carrier be heard in Superheterodyne receiver? Why do we need BFO?

I think a continuous carrier be able to heard in a super-heterodyne receiver, since it has it's own oscillator. Why do we need BFO then? What's the difference between the two? So, morse codes would ...
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0 votes
1 answer
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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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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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1 answer
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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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1 vote
1 answer
80 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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