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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2answers
90 views

Why would phones have a radio receiver, but not activate it? [closed]

According to some recent news articles, many cell phones including iPhones and Androids have built in FM receivers, but they are not "activated". Why would the phones have such a feature but not ...
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1answer
35 views

FCC cert - inactive transciever

Does the product on USA market with inactive transmitter (2,24 GHz) need the FCC certification? We are going to use Tx/Rx module, but the transmitting function will be software disabled.
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0answers
37 views

Receiver wake up time

I want to make an extremely power efficient node that can receive a signal and determine what to do with the information it received. Since receiving requires a lot of power, I want to occassionally ...
3
votes
2answers
67 views

Difference between ultrasonic transmitter sensor and ultrasonic receiver sensor?

What is the difference between ultrasonic transmitter sensor and ultrasonic receiver sensor? Can an ultrasonic receiver sensor be used as an ultrasonic transmitter sensor or vice versa?
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2answers
46 views

Turning LED lights on/off based through any wireless means

I've spent several hours researching this website for an answer to my question. The problem is i don't know the terminology or anything. So if you know the answer please treat me as an individual with ...
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1answer
83 views

WWVB Antenna Reciever 1st Amplifier stage, no signal

I made a high input impedance JFET CS amp as the 1st amplifier stage for a 60kHz Loopstick Antenna. I am using an RF JFET (J211) and ceramic capacitors. The only signal I see is a 60Hz sine wave ...
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1answer
58 views

WWVB simple receiver help

I am trying to experiment with WWVB receiver design... The antenna I am using is from another WWVB receiver module. It is a loop antenna with a capacitor that I assume is tuned to 60kHz. Questions- ...
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3answers
132 views

Are the same type of antennas used for receiving and transmitting?

Short version: Is the same antenna type used for transmitting as is used for receiving if the frequency is the same? Long version: My garage door opener uses 433 MHz to receive signals from the ...
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2answers
46 views

WWVB antenna interferance from AC/DC converter supply

I'm working on a design that uses a WWVB antenna receiver.... The WWVB antenna is a small (~ 1/4" x 4" rod). Size is not a constraint so I could make it much bigger if a I half to. The design is ...
1
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1answer
40 views

ferrite antenna impedence matching

I am using a WWVB receiver for a project I am working on. The ferrite antenna that the receiver came with has terrible gain and I want to make one that is several times larger. I know how to make a ...
0
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1answer
154 views

Improve output quality of FM receiver TEA5767

I have connected a TEA5767 to my Arduino board using I2C and can tune it fine (see instructable.com). As antenna a ~70cm long simple cable is connected. I've connected a cheap 5V amplifier. ...
1
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1answer
191 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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1answer
37 views

Sony STR DN1030 2nd volume control using a second Vr Encoder

First off, I am very, very new to any electronic physics/engineering. Here's my problem: I want a second remote volume control for my receiver that is wired to my desk. (I have already managed to ...
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1answer
121 views

RS232/RS485 Converter Circuit Receiving Problem

I'm trying to make an RS232/RS485 converter circuit. I used a circuit from http://airborn.com.au/layout/232cnv/232to485.html site and i changed some components on that circuit. Then I established my ...
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1answer
80 views

Wiring the antennas together in RF link 315Mhz RX and TX

I am using a 315Mhz Transmitter and Receiver RF link kit between two arduino. What happens if I wire the antennas of both RX and TX to both ends of a 1 meter long metal wire? Will using a conductor ...
0
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1answer
74 views

45 Ohm volume control on 8 ohm speaker, what would happen? [closed]

A friend of mine was asking me to splice a 45-Ohm intercom speaker volume control between his speakers and receiver, at 6 or 8 Ohm. Obviously it's not ideal, but what would happen? Would the speakers ...
1
vote
1answer
108 views

Can an inductor be substituted for a coil

I am designing this FM receiver circuit. I have a few questions related to the circuit. Buying coil in my locality is a little expensive. So would it be alright to substitute an inductor in its ...
0
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1answer
80 views

Fm reciever local VFO sa615

I'm building a FM receiver based on a SA615. But when I test the VFO (variable frequency oscillator) with a spectrum analyzer and a sniffer probe I don't see any frequency showing up. So the ...
1
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1answer
157 views

433 Mhz Receiver with stm32f4

How do I receive data with my stm32f4 board with a classic 433 Mhz receiver? Arduino and Raspberry have their libraries to do such a thing. Do I have to implement it myself? If yes, how do I do that? ...
2
votes
1answer
146 views

Combining speaker outputs to one secondary amplifier

I have a tricky question, I hope you are able to help. I have had a search through this site and others and found part solutions to my questions. The issue: I have a Denon 5.1 av receiver and have ...
0
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2answers
103 views

433mhz radio reciever non demodulating [closed]

I am currently working on a direction finder project for rf signals. I am attempting to use a phase detector chip to compare phases and calculate the direction. The main problem I am experiencing atm ...
0
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2answers
36 views

CDMA modulation syncronization

Related: How in CDMA mobiles receiver gets unique code to decode its respective signal? This question says that a cdma "channel" has a publicly known code associated with it. Ok. But, how is this ...
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1answer
187 views

Designing a simple ELF-VLF Receiver with Loop Antenna

I'm going to design a simple Receiver and Loop Antenna pair to receive signals repelled from Meteors upon hitting earth aerosphere with the frequencies around 3-30KHz. It's going to be introduced to ...
0
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2answers
159 views

Why is DC offset from LO feedthrough less problematic in the second mixer stage of a dual conversion receiver?

A dual conversion receiver has two frequency translation stages. The first mixer translates from RF to IF; the second (IF) mixer translates from IF to baseband. This architecture is supposed to help ...
3
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1answer
658 views

How does a closed loop antenna work?

There are many videos and explanations about dipole antennas and the theory seems to make sense. But when I see closed loop antennas I am very confused. None of the material I can find about antennas ...
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1answer
97 views

How can I maximize the amount of energy an antenna is receiving?

Bear in mind that I am very new to electrical design and have only a beginners level circuit course under my belt. I am trying to build an AM radio and although there are a lot of tutorials out there ...
1
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1answer
83 views

Maximum achievable SNR (SNR before LNA)

I am trying to understand the concept of noise figure and the best achievable SNR. The noise figure is a measure how much a device degrades the SNR. Say I have a receiver with a NF of 16dB, then the ...
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1answer
1k views

How do I avoid interference in 433 MHZ RF transmission (in my case)

I suppose to do remote keyless entry (RKE) for door opening as a commercial product, there is DC motor which drive the door to open or close (receiver side), on transmitter side (remote) three button ...
0
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2answers
149 views

Equalization of Square Pulse in Visible Light Communication

I am currently working on a VLC project to build a VLC receiver. I attached a schematic of the circuit I have designed. The circuit on the left is the transmitter sending a square signal at 1 MHz ...
39
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8answers
5k views

Can a radio transmitter somehow detect the number of receivers in its area?

During conversation, a colleague proposed that over-the-air television and radio broadcasters can determine the number of viewers or listeners based on the "load" on their signal. This seems to me ...
0
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1answer
61 views

Changing the port values inside the loop (8051)

I am using RX/TX module an ht12d/e for my project. I will make it short, in my program i am making a packet of data and sending it and the receiver is receiving it synchronously. The receiver is set ...
0
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2answers
160 views

How do I implement TDMA with basic 433 MHz transmitter receiver pairs?

Is it possible to use TDMA or some kind of time synchronization / pseudo random coding for a number of transmitters so that they can be interfaced with a single master receiver without jamming?
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1answer
41 views

Can signal arrival times be a function of receiver bandwidth?

Lets assume that the speed of light is exactly \$3\!\left(\!10^{8}\!\right)\text{meters}/\text{second}\$. Suppose we have a transmitter on the surface of the earth emitting a signal at 1000 MHz and ...
0
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1answer
72 views

900 MHz FSK Receiver Stage

I am designing an FSK transceiver that operates from roughly 902-928 MHz with at least 18 possible channels. Using the 5-bit DAC in my microcontroller, I plan to control a Crystek VCO ...
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1answer
543 views

Using HT12E/D with RX/TX 433Mhz modules

i have ht12d and ht12e ic's and rx tx 433Mhz modules. i arranged the ht12e to the output port of Microcontroller and connected the ht12e to transmitter and similarly to the recieving side. is it now ...
0
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2answers
234 views

Arduino along with radio tx/rx

I'm thinking about a project similar to the home-automation systems etc... Few problems came in the way, The cost of the Arduino radio receivers/transmitters is huge, especially if I need few of ...
1
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1answer
321 views

Question on superheterodyne FM receiver to find the range of local oscillator and the image station …?

Consider a superheterodyne receiver designed to receive the frequency band of 1 to 30 MHz with IF frequency 8 MHz. a) What is the range of frequencies generated by the local oscillator for ...
2
votes
1answer
98 views

RF receiver design - estimate received power

I'm designing a radar receiver, whose block diagram is below: When I compute power received from radar range equation, it varies between -90 dBm to -40 dBm depending on the object's location (60 to ...
1
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1answer
168 views

Transmit electrical signal across human body [closed]

Is it possible to transmit and receive an electrical signal SAFELY using the human body as a medium? For example, I would have a transmitter of some sorts in my left hand, and a receiver in my right. ...
0
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1answer
102 views

Timed Infrared or Infrared PWM Signals

We are trying to have a moving IR receiver pickup a specific IR-led for a range of IR-LEDs. The options we're looking at : Send and unique pwm signal from each different led, the moving object ...
0
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1answer
294 views

How to convert this FM transmitter to receiver?

I made this circuit and it works properly but I need to make an FM receiver using the same idea of this circuit (common base). Would you tell me what changes should I make so that the circuit is able ...
0
votes
1answer
112 views

What is the pinout on my K F455P 7An filter?

I have a ceramic filter that I'm using for an AM receiver, but I don't know the pins for it. The lettering on it says K F455P 7An. I know that it's a 455 kHz signal filter and I think that it has a ...
-1
votes
1answer
60 views

Looking for a LED transmitter/receiver package(or group of components)

I am trying to design a system that utilizes 355nm and 370nm LEDs. I want to keep their intensity stabilized at a certain value, so I want to create a feedback loop. I am using these LEDs as ...
0
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1answer
232 views

Reception of data using pic12f1822 UART

This is the code ...
-1
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1answer
290 views

RF - separate transmitter and receiver antennas for half duplex

i was wondering why is it for just half duplex systems, don't we have a dedicated transceiver and a dedicated transmitter antenna. ok, just hear me out... assuming we are using grounded monopoles, ...
0
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1answer
79 views

FM receiver used to control a switch

I am new to this and I would like to ask for advice on FM receivers. I want to create a very low powered (mass produced) item that has a super bright LED, battery and then related circuitry(for FM). ...
0
votes
4answers
670 views

How to build a simple LED transmitter and receiver

I'd like the distance to be about 1/10th of a mile; less distance will be fine if that's easier to build. What tools and parts may I need for this? I have plenty of LEDs lying around and I have ...
1
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2answers
54 views

What are the trade-offs of transmission bands?

If I were designing an RF circuit how do I determine what band the circuit should operate on? What are the trade offs? and why is the higher the frequency the lower range? It is quite un-intuitive for ...
-1
votes
2answers
335 views

Questions about FM receivers and transmitters?

I have a test tommorrow on phase lock loops, AM/FM receivers along with several other topics. I need to understand this topic clearly before I take the exam to advance to the next schooling in the ...
0
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2answers
84 views

Which characteristics of a Radio signal are involved to be selected by radio receiver? [duplicate]

the radio antennas receives millions of signals. how our radio selects the appropriate signal as it's input? which characteristics of the signal are involved for this selection.