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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46 views

RF Transceivers [on hold]

I just need to send signal pulses with different duty cycle from RF transmitters of same frequency to a single RF receiver. How to differentiate the pulses from each transmitter?? Can anyone help me.. ...
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1answer
50 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
42 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
70 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
39 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 ...
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0answers
53 views

FM Receiver Antenna Reception Check

I have implemented the following FM receiver circuit by radioshack: http://web.archive.org/web/20090121123846/http://braincambre500.freeservers.com/rss(1)(1)(1).htm I haven't been able to receive ...
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1answer
32 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
58 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. ...
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1answer
87 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
26 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 ...
0
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1answer
58 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
56 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 ...
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0answers
46 views

What range of VU meter needed for this RSSI s-meter circuit?

I have a circuit for a RSSI signal strength meter for an MC3362-based 144MHz receiver, but I don't know what range of VU meter I shoud use. Here's the receiver circuit: And here's the s-meter ...
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1answer
55 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 ...
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1answer
75 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 ...
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1answer
50 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 ...
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1answer
88 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
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1answer
92 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 ...
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2answers
92 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 ...
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0answers
59 views

bluetooth audio receiver pair name change error by onboard serial

My 1st question. I've got a cheap PT-810 bluetooth audio receiver whose chip is very clearly pictured at http://www.eevblog.com/forum/beginners/bluetooth-module-noise-issue/ My aim is to rename the ...
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2answers
34 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
106 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 ...
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2answers
83 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 ...
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1answer
296 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
89 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 ...
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1answer
70 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
609 views

how to avoid interference in 433MHZ rf transmission (in my case)

I suppose to do RKE (remote keyless entry) 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 ...
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2answers
103 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 ...
37
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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 ...
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1answer
56 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 ...
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2answers
117 views

How to implement TDMA with basic 433MHz transmitter receiver pairs ?

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

Ultrasonic sensor pair operation

I have had success with using SR04 to measure distance from the SR04 location to nearest obstacle. Now I want to be able to measure distance of two mobile location one mounted with ultrasonic ...
0
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1answer
38 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 ...
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1answer
66 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
448 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 ...
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2answers
181 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 ...
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1answer
235 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
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1answer
80 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 ...
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1answer
148 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
91 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
222 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
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1answer
89 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 ...
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1answer
59 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
191 views

Reception of data using pic12f1822 UART

This is the code ...
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1answer
254 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
70 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). ...
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4answers
582 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 ...
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2answers
53 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 ...
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2answers
261 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 ...
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2answers
74 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.