Electrical Engineering Stack Exchange
Electrical Engineering Stack Exchange

Questions tagged [tuning]

32 questions
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1 answer

Analog television: What is the difference between the first IF and second (demodulated) IF?

I am trying to understand what kind of changes occur to a signal in the chips which sit between the tuner and, for example the FM audio demodulator. Take the attached example - the TDA2546A. It takes 38.9 MHz IF from the tuner, which'll be…
Matthew Millman
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1 answer

Where to connect the VNA during matching network tuning

I'm trying to design the matching network between an antenna and its transmitter, running at 868MHz, as shown below. There's probably about 20mm between the transmitter output and the Pi network. When connecting the VNA to the PCB in order to…
Amr Bekhit
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5
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2 answers

Why do AM radio stations have secondary frequencies?

First thing I'm sorry if this question sounds too much beginner-ish. I don't major in electrical engineering so I may lack the basic knowledge. I have been noticing that, while tuning my AM radio, nearly all stations have a "secondary frequency"…
MattCat15
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How to connect the VNA to RF transmission line for antenna tuning?

I am working on a 2.45 GHz(Bluetooth) project. the design has a Chip antenna with 50 Ω impedance trace to connect antenna and chip. I intend to tune the antenna impedance using the Pi network using VNA. I have a basic VNA (I bought it on Amazon). I…
Sussy
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RF Jumper at 2440MHZ

I need a series component to isolate a 2440MHZ antenna for testing purposes-- it can either be a a high quality 0402 RF capacitor (Johansen) or a zero ohm resistor. The series component will remain on after the product is shipped. I do have any…
BHS
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Gating MOSFET with an antenna (adjust voltage to use only peak)

If we pulse a coil/tank circuit it's supposed to ring at it's natural frequency. We could use a pickup coil over a shared ferrite core or a straight antenna, connected to the gate of a MOSFET to time the pulsing signal and remain at resonance…
juanmf
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How does one choose a resistance for an AM radio antenna receiver tuner?

[![enter image description here][2]][2] I am using some pretty rough, brute force and novice calculations, so if anyone knows a nicer method I am happy to learn. I want to build an AM radio receiver from scratch. My oversimplified starting point was…
Adriaan Berger
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How to design a PI controller for fourth-order transfer-function?

Fourth-order systems may render very complex characteristic equation that are difficult for tuning. Is there any method to tune controllers for these systems easily?
Domino
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Tuning PID Controller with high precision

I'm learning control theory at university and I have to design PID controller for this object G(s) = 10/s(s+1); But my teacher requires settling time <10s and %overshoot <=2% Anyone can suggest me some methods to tuning PID parameters satisfying…
John Smith
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Radio tuning capacitor

In a radio tuning capacitor that consists of semicircular plates , are the plates connected in series or in parallel ?
user207332
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Antenna tuning & impedance matching, do i need to connect the IC?

I want to make a pcb rf trace to use it as an antenna, for a bluetooth IC. I have already studied the basics of impedance matching and antenna tuning, smith chart and antenna clearance. The specific project is on my github, if anyone is interested:…
Basilisvirus Instrector
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Do algorithms exist for tuning microwave filters?

I'm a systems engineering student and I have taken a summer job at a company that manufactures various microwave filters, my role is to "try" improve and standardise their processes in order to improve production reliability. As the company…
8TrackRobot
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Magic Eye Tuning Tube Variable Negative Voltage

I am thinking about several applications of magic eye tuning tubes as display pieces and had a question about their operation. I have attached a sample circuit from a datasheet for an EM84 tube. I know the shadow is controlled by the voltage on pin…
Efram Goldberg
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Ziegler–Nichols method of PID auto tuning

I am working on a problem where I need to implement auto tuning PID control using Ziegler–Nichols method. Basically I want to control temperature using it. The PID has to be implemented with the Microchip PIC 18F microcontroller. However, I have no…
newbie
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How do I implement lumped circuit elements in ANSYS HFSS v15.0?

I am simulating a PCB antenna using ANSYS HFSS v15.0. Before the signal is fed into the antenna, there is a smoothing capacitor and an LC T-section matching network to match the impedance of the 50 Ω trace to the antenna. I am aware that there is…
aditya_stack
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