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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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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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25 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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51 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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20 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
67 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
37 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
32 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
55 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
127 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
190 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
84 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
28 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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50 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
93 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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1answer
42 views

Receiver Antenna Gain

How is gain defined for a receiver antenna? If we look at a radiating antenna, there is a Pin, and the gain in a particular direction would be the radiation intensity Ur, divided by the radiation ...
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1answer
92 views

Creating a wireless transmitter/receiver for off-the-shelf siren

Since I oddly enough haven't been able to find a suitable off-the-shelf product that's reasonable priced (less than 50-60 EUR/USD) and somewhat good looking with Google, I'm about to try a small ...
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1answer
173 views

What does a TV receiver circuit look like? [closed]

I found a few circuits for TV transmitters, but no receivers. I've looked at other simpler RF transmitters and receiver, but it's not obvious to me how to reverse the circuit that I have. I want ...
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42 views

Locating mobiles/UE by base stations in a cellular system [closed]

After understanding a bit about how actual cellular systems function, I realized that identifying the mobile/UE location is key in assigning the UE to correct base station and thus to guarantee a ...
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110 views

LoRa RX-Single Mode Inconsistent RX-Timeout Interrupts

I'm trying to implement LoRa communications using an SX1276 module (DRF1276G) and an ATmega328P on a custom PCB. I've got it mostly working but I'm having a strange issue with the timeout interrupt. I'...
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2answers
44 views

Pulse Train Sampling Rate

Assume I have a pulse train with frequency of F Hertz. A normal square wave has all odd harmonics. From Nyquist, if I want to "Reconstruct" the waveform, sampling frequency Fs should be at least 2*(...
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1answer
101 views

Two different widths / sizes of banana plugs on home audio receivers?

I am replacing an Onkyo TX-SR606 with an Onkyo TX-NR575. On the TX-SR606 unit, I used these "dual" banana plugs (see photo), a single unit with both positive and negative connections on it. ...
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1answer
43 views

Quadcopter RX TX questions [closed]

I'm working on a quadcopter and have some questions about the receiver and transmitter. I'm going to be milling the boards myself and wanted to know what would be a good carrier frequency to use. I ...
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1answer
46 views

Does the Si4731 / Si47xx provide the necessary info to fetch left/right demodulated audio levels?

I'm working on a project which uses an Si4731 broadcast radio receiver IC (Si47xx family) and which calls for left & right demodulated audio level meters based on a source FM broadcast signal. I ...
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2answers
108 views

RF range at 169 Mhz

I'm planning a sensor network for agriculture (that apparently doesn't exist yet in this form) and I'd like to understand the possibilities of the radio link. A good number of in-the-field soil ...
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3answers
81 views

Ambiguous symbol [duplicate]

Does anybody know what this symbol presents?
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1answer
103 views

EHF RF Transmitter and Receiver

We are working on a blood glucose meter that will measure BG readings through radio waves with a frequency between 60-70 GHz. That range is necessary to allow penetration through the tissue and we ...
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1answer
95 views

Temperature sensing bee hive

I am a honey bee researcher and I want to build a temperature sensing system to monitor the temperature changes in the three dimensional space within the hive body using 5 sensors on each hive frame (...
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1answer
181 views

Effective area or effective aperture of antenna

The effective area simply represents how much power is captured from the plane wave and delivered by the antenna. The explanation begins oft with assumption that antennas have the same polarization. ...
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48 views

Why do we need an (adaptive) equalizer when we have a matched filter at the receiver?

When both can perform the same task of reducing the effects of ISI, why use both and not just one at the receiver end?
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3answers
842 views

Low power amplifier for 433MHz wake up receiver

I’m designing a low power wakeup receiver (WuRx) circuit that will be used to wake up an Arduino and its 433 MHz transceiver, both of which pull way too much current (tens of milliamps) to keep ...
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1answer
138 views

How do I design a DC-block cap without interfering with my filter?

Background I'm considering the design of an AM receiver for three fixed channels - 3.33MHz, 7.85 MHz, and 14.67 MHz. The antenna I'm considering is a manually-wound loop antenna with a design-able ...
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3answers
279 views

Why do we need orthogonality for FSK carriers?

I keep on coming across a requirement for FSK carrier separation, \$1/T\$ for non-coherent detection and \$1/2T\$ for coherent detection, where \$T\$ is bit period. I understand where this comes from ...
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3answers
147 views

How to find coupling and decoupling capacitor values?

I am trying to learn receiver design, one thing I noticed is the use of coupling capacitors and decoupling capacitors and incuctors. There were set of standard values such as 100 pF, 1000 pF or 0.1 uF ...
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57 views

Frequency selective preamplifier at 10-20 kHz

I'm looking for a way to amplify microvolt AC signals generated in an induction coil. I want to use 5 V single supply rail-to-rail opamps to amplify the signal at least 100 times in the range of ...
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1answer
65 views

Multi-fixed-station AM receiver

I'm in the pencil-and-paper stage of building a radio receiver that has the following characteristics: AM shortwave/HF three fixed frequencies - 3.33, 7.85 and 14.67 MHz single upper sideband with ...
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4answers
1k views

How can a low efficiency antenna be used for receiving but not for transmitting?

For the reciprocity theorem, if an antenna has a low efficiency in transmission, it has the same efficiency when receiving. In literature, it is usually said that one shouldn't use a low-efficiency ...
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1answer
285 views

What is mean by channel inversion in wireless communication

Regarding the title of the question, to my understanding, Channel Inversion means that "The transmitter adapts its power to maintain constant SIR at the receiver." It is a technique used for ...
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154 views

QI COMM-Signal Simulation ltSpice

For a school project (Wireless Charging), I have to filter out and display the communication signal (2KHz) between transmitter and receiver from the Power Signal (100KHz). For this I have set up the ...
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2answers
71 views

msp430-uart-receiving big data [closed]

I want to take data from sensor with UART. But I know the coming data from uart like; decimal = 126 0 10 131 0 0 27 0 1 2 0 - - 159 hexadecimal = 7E 00 0A 83 00 00 24 00 01 02 00 01 7A DA Firstly,...
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1answer
87 views

How to match two clock signal's phases which are physically apart in two locations?

Suppose, I have one Tx and one Rx physically separated by the long distance with clock signals CLK1 and CLK2 as shown in fig. (say both of 50MHz). I wish to align them in phases. By that I mean, ...
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133 views

LNA using Common Emitter with feedback collector

I am trying to design an LNA with input impedance of 50 Ohms, I am considering the topology illustrated below. I have found an online calculator that computes this however when I try to work out the ...
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0answers
66 views

I'm trying to tune this receiver to 1360 kHz in the AM Band. What value resistor do I need?

I'm using an Si4844-B20 (datasheet here), and I'm trying to have it permanently tuned to 1360 kHz (AM station). Right now, I'm operating off this example schematic: I'm trying to figure out what ...
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1answer
64 views

SA605 input impedance

I am trying to find the associated input impedance to the SA605 mixer RF inputs. I have found several App notes associated with the Chip that discusses the design. On the datasheet they present the ...
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2answers
206 views

FM preselect filter

Hello I am designing an fm receiver and had some questions about the RF front end. To tune into different channels I know I need a tunable oscillator, but does the bandpass filter connected to the ...
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0answers
54 views

Decrease voltage rating for replacement capacitor

I want to replace 2 large capacitors in my Sherwood S9910 receiver. Existing caps are 15,000 uF 65 volt. Would it be okay to replace with 15,000 uF 63 volt? Or better to go with 18,000 uF 80 volt. In ...
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1answer
85 views

RLC receiver - problem dealing with signal

Hello I have just build colpitts oscillator, which gave me perfect 500Hz sinusoidal wave. So far so good. Now I would like to receive this wave in second circuit "receiver" and here problems start. I ...
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1answer
72 views

FM folded dipole Antenna

I am designing my personal FM receiver, and I have a question regarding how to design my Antenna, in terms of choosing the wavelength to determine the size of the antenna. To put it as simple as ...
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2answers
189 views

Could a vintage 9 transistor AM/FM implement a phase-locked loop of some form?

A side discussion around an answer to the question How many stations could one hear with an AM/FM radio in front of the ISS' cupola window? has arisen with regard to the possibility that a change in ...
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1answer
98 views

Purpose of L2,L3 & C6 in the following CW transmitter circuit

I have been trying really hard to understand the purpose of L2, L3 and C6 in this CW transmitter, especially L3 and C6. I have received many conflicting answers such as that L3 is acting as a ...
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85 views

self-quenched oscillator

I am trying to simulate a circuit which is composed of an oscillator which oscillates and reaches a maximum oscillation amplitude, then there's a peak detector that is following the peak of ...