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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1answer
41 views

How to Charge Device With Phone and Charge Phone with Battery

I have a pretty unique problem (couldn't find answer on Google) for a DIY electronics project. I want to be able to charge a FPV Receiver via a phone and charge the phone with a battery. I want to ...
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29 views

Si4362 Reciever operating outside band

Fellow engineers, I have RF related problem I've found interesting receiver chip which I intend to use outside designated band. Si4362 It is stated in datasheet that: Frequency range = 142–1050 ...
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1answer
132 views

How to deal with ground in VCCed-chassis device?

I'm restoring old USSR radio receiver ("Okean-209"). I've already resoldered all electrolytic capacitors so audio amplifier works great again (there was very low sound before that). However, there are ...
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109 views

Understanding this simple FM receiver

I know the theory of FM, but I just can't understand how this simple circuit works. So let's say a radio station is transmitted on 100 MHz, as I understand in this case the oscillator should also ...
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38 views

Zero - IF receiver main limits

I was reading these slides about receivers architectures, and I have some questions about Zero - IF receivers: Precisely: Why is the spectrum around the carrier (i.e. the 2 "side bands") mirrored ...
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1answer
104 views

Making a Remote Control for My TV from Scratch

This might seem silly to many of you, but I lost my TV remote when I moved awhile back and instead of buying a universal remote for cheap, I want to make a remote for my TV from scratch myself. I'm ...
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1answer
58 views

What IF amplifier configuration can I use in my receiver?

I am making a superhet SSB CW receiver with a crystal filter on the input after the mixer. Do I have to use IF transformers as the coupling method (1) or can I use capacitor coupling with resistors ...
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2answers
77 views

Why does a Double-Balanced Mixer Reject the LO?

Look at the image of the so-called Double-Balanced Mixer (this is the active version). I understand why there is no leakage of the RF frequency in the output (because the LO square wave by which the ...
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2answers
51 views

How to receive the digital data from an ASK/FSK Receiver (E.g. TDA 5210)

While reading the specs on a FSK/ASK Receiver (E.g. TDA 5210 ) I am asking myself how actually the (non Manchester encoded) digital data look like and how to I receive it when sending from another ...
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4answers
90 views

Substitute for 455 kHz Ceramic filters in new designs

I was wondering what has ever happened with the 455 kHz ceramic filters commonly used in the second IF stage of a superhet radio receivers? All but just a very few (and those left over don't seem to ...
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24 views

Concept of matched filter maximising SNR

The above question is a solved question from Digital Communication by Proakis . The question is about matched filter where I know matched filter is used to maximise the signal to noise ratio at the ...
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1answer
38 views

Connecting a CAN node results in infinite errors on the bus

I'm developing a device which is controlled by the received CAN messages. The device should be eventually mounted in a vehicle. The device receives messages only. It doesn't send any messages on the ...
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45 views

Have trouble designing antenna coil for chip receiver

I'm trying to wind a 125khz rectangle coil antenna for the AS3933 receiver chip. I calculated inductance using this calculator where parameters were: Loop Width:20cm Loop Height:14.5cm Wire Diameter:...
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5answers
1k views

How to end sending data over I2C by Slave or Master?

Let us say a Slave or Master is sending multiple bytes to the receiver on I2C bus and the number of bytes is not defined before hand. So then how will the sender tell the receiver that it has no more ...
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1answer
60 views

RF receiver always having 1 on output

So my problem is I want to build a wireless system with arduino and an RF module. It is like this one: But when I tested the module, with this site: https://www.instructables.com/id/How-to-test-RF-...
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28 views

Experimental loss measurement of simple wireless link

I connect a simple SDR to a spectrum analyzer (SA) and measure the output power. The SDR outputs a single tone at 1 GHz; between SDR and SA is a lowpass filter: With gain setting GTX1 I measure -53....
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50 views

How to IR LED as half-duplex transceiver or just receiver?

I'm i need to capture IR signals in their raw form from IR remote to analyze them. Currently I'm doing it by connecting logic analyzer directly across led on the remote. I want to skip that step and ...
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1answer
67 views

Active Mixer RF Input Power and Input IP3i, P1dB Question

I am new and learning in this field. The received signal is first amplified with SKY65404 LNA and secondly with HMC313 Amplifier. Lastly it is connected to Active Mixer ADL5801's RFIN pins. In ...
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1answer
33 views

ensuring transducer (transmitter) and receiver polarity

I am trying to implement a simple phased array of 7 transmitters rated 40 kHz. I have a few receivers to measure the acoustic field generated to validate if it works. What is a simple way to measure ...
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1answer
56 views

High - Frequency Carrier Necessity

let's consider a basic scheme of a receiver. Now I have two questions: I was told that the presence of the mixer is important since it is useful to delete the carrier frequency of the received ...
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1answer
66 views

How to physically connect AS3933 to 3D antenna?

I'm trying to breadboard LF frequency receiver circuit using AS3933 receiver chip IC and CAS143-147 3D antenna chip. However I don’t understand how can I connect AS3933 pins to CAS143 on a breadboard. ...
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0answers
44 views

How can we actually use PPM output from a RC receiver

I'm using FS-CT6B transmitter with R6B receiver. I have seen many code examples and tutorials for reading PPM output from R6B using Arduino Uno. In some of them, only one pin is used (external ...
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3answers
68 views

How to decode an IR from device [closed]

I have the Mitsubishi DA-R45P receiver, but I don not have a remote for this device. And without remote this device can not work. I see that there are universal remotes with learn function, but for ...
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1answer
63 views

Can long-range radio waves from an RTV tower penetrate thin plastic composite material next to its source?

We are currently developing a conceptual design for the renovation of Croatia's main RTV tower located on 1033 meter tall peak Sljeme at the Medvednica mountain north of Zagreb. The idea is to ...
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1answer
69 views

What receiver is appropriate for studying compromising emanations in 2019?

I'm currently reading the Cambridge Technical Report Number 577, Compromising emanations: eavesdropping risks of computer displays, by Markus G. Kuhn and published in Dec 2003. In the paper, Kuhn uses ...
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5answers
195 views

How to turn on LED using RF as a catalyst?

I am trying to build a circuit that turns on a LED diode when it detects AM radio waves, in order to create a "radio wave detector". Before I explain further, please note that I am not trying to ...
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2answers
143 views

How does this circuit work? (AM receiver)

I do not completely understand how this circuit works: First, I do not understand how the LC filter selects the frequency. I know that it's impedance is 'infinity' at the resonant frequency, but I ...
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1answer
46 views

why we use LNBF instead of simple dipole antenna, at the focal point of reflector of satellite dish antenna?

LNBF is made of horn antenna, waveguide, half/quarter wave dipole and some circuitry on PCB. I know Horn antenna is used to match impedance between waveguide and free space but my doubt is, why we ...
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2answers
61 views

Determining whether signal meets the 12 dB SINAD voltage

The specification for the sensitivity of a certain radio receiver says: Typically 12dB SINAD NBFM for 0.15uV at 145MHz. If I understand correctly, this means that the received radio wave should have a ...
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25 views

How conventional DFE (Decision Feedback Equalizer) works?

There are a lot of variations of DFEs online. But I couldn't find a step by step explanation on how for example the 2-tap DFE works. Can you provide an explanation with a scheme ? I looked for some ...
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1answer
31 views

Rf Module Receiver With Pt2272 always gets signal

I am just trying to on and of an led with rf module. I have tried lots of module but my works end up with same result. When I feed my receiver, with led connected to data out, it always powers the ...
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1answer
184 views

Triode Regenerative Receiver Circuit - room for improvement and possible errors

I've designed this radio circuit, it's made to work on the 80m and maybe 40m band. Regen is controlled using a pot in the tickler coil. Tube is ECF82, coil is air cored on a 30mm former. Will it be ...
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1answer
74 views

Why does my Android phone charger cause my (powered-off) stereo receiver to make a high-pitched chirping sound when plugged into the same powerstrip? [closed]

After days of scouring my apartment, wondering if I’d developed another pitch of tinnitus, trying to figure out what the hell was making that infernal noise, I finally isolated it to this. Onkyo ...
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2answers
511 views

STM32 CAN bus Rx interrupt only triggers in loopback mode

I'm designing the CAN interface for a STM32F042C4T6 to be able to receive and send messages. I've tested my code and everything seems to work perfectly fine in loopback mode. However, when I hook up ...
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3answers
1k views

Diode in opposite direction?

Its really bothering me that the diode is shown in the opposite direction here and i don't understand why its been put like that? the input voltage will come from the left side of the circuit then why ...
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0answers
38 views

AM Radio Receiver - Speaker Volume?

I have the AM Radio receiver design following: Where 1 is the antenna to receive the am modulated signals. I am getting low output in the speakers at 9th section where the demodulated signal is given ...
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1answer
128 views

Led panel sending and receiving card working

I understand how a RGB LED panel is driven from sparkfun's explanation (here). From manufacturers like Huidu and Novastar I get that in a setup you often need a sending and receiving card. Like you ...
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0answers
53 views

What causes the fail-safe bit to be set in the SBUS protocol?

What causes the fail-safe bit to be set in the SBUS protocol? I know that the when the link between the transmitter and receiver is lost, the fail-safe bit is set, however, what constitutes a 'lost ...
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263 views

Designing a Flex PCB as a wireless charging coil

I am designing an inductive charging circuit to power up a small device with an odd shape. None of the off-the-shelf coils fit the dimension specified. I figured I needed to design my own coils like ...
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0answers
104 views

Correct way to calibrate SDR RX into a measuring receiver

While playing with my SDR (Software Defined Radio) Board, I was interested in performing a TX output power table at different center frequencies and TX antenna gains. However, unfortunately, I do ...
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2answers
128 views

How to make the receiver send signal back to the transmitter with wireless RF 433MHz module

I want to buy a RF transmitter & receiver 433MHz on the internet for our research project which deals with radio frequency. I badly need the concept of having the receiver notify the transmitter ...
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2answers
46 views

ETSI EN 300 220-1 General performance criteria

In Chapter "general performance criteria" the standard states that these criteria, for receiver performance tests, are equivlent: after demodulation, a data signal with a bit error ratio of 1% ...
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2answers
41 views

What is an example of driver and receiver chips for a PCB?

I am watching some tutorials on signal integrity and the instructor keeps referring to a driver and a receiver. I am a little confused what exactly this would be when designing a PCB is the driver ...
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2answers
108 views

IR receiver giving constant current

simulate this circuit – Schematic created using CircuitLab This is a circuit I made with an 1838D IR receiver in order to test if a tv remote is working, but as soon as I press the button, the ...
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1answer
257 views

UART receiver VHDL

VHDL FPGA UART receiver which receives 10 bits via Bluetooth interface. With 8 7-segment displays. Now my problem is the following In the requirements it is stated that I have to write the solution ...
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2answers
298 views

Explain this circuit

I know this circuit is an oscillator circuit and it senses another signal of same frequency, but I don't understand the calculation behind it, and the reason for emitter inductor, 3.9k collector ...
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1answer
109 views

Microwave - Standard Intermediate Frequency?

VHF/UHF receivers use one of a few standard intermediate frequencies. Is there a similar set of standard intermediate frequencies for microwave (around 3GHz) receivers? As I understand it, the choice ...
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1answer
141 views

Friis transmission equation (log scale calculation)

I am trying to understand the Friis transmission equation. My scenario: I consider transmit antennas (\$T_x\$) and receive antennas (\$R_x\$) at a distance R [km]. f [GHz], \$G_{T_x}\$ and \$G_{R_x}\$...
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1answer
67 views

How can I make a voice transmitter receiver? [closed]

How can make a system which have two circuit. And one is place at ground floor and another is in roof. We send voice (like call) one from other by pushing a switch and vice versa. It may be wired ...
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3answers
167 views

Why does the voltage induced in the receiver coil of this WPT circuit decrease when a load is added (in parallel)?

The following is a circuit that wirelessly transfers power via inductive coupling. The circuit is supposed to power a 12 V 0.15 A DC fan and a typical smartphone, which requires 5 V DC across it. The ...

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