Electrical Engineering Stack Exchange
Electrical Engineering Stack Exchange

Questions tagged [tuner]

27 questions
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votes
2 answers

Antenna matching network topology

In tuning an antenna, there are multiple possible topologies that will take it to the middle of the smith chart. Some differences that I can see between them are: Component ESR (losses). Effect of component tolerances. Resulting antenna…
apalopohapa
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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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Is there a clever way to use a small variable capacitor where a larger capacitance is required?

I am designing an activity where students should band pass a song to find a hidden message at 1000Hz. Problem I have considered using a notch filter and tank circuit, but using the formula $$f=\frac{1}{2\pi\sqrt{LC}}$$ I cannot reach the range of…
Klik
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How exactly to track oscillator in superhet receiver

The IF is 490 kHz. I have learnt that the local oscillator and the tuning block before the IF stage must "be aware of each other" or track. So in my case, the tuning of both the circuits should differ by 490 kHz. See this article: Radio Receivers -…
Plutonium smuggler
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3
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1 answer

Component identification - MELF capacitor? inductor?

I opened a circa-2005 TV tuner VHF/UHF "can" from an 19" CRT Emerson TV and found these hollow MELF components. Can anyone identify what they are? They measure as capacitors but I initially suspected they might be bead inductors. Please see attached…
mcfudge
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How to properly connect and drive varicap diodes?

can someone explain me how to connect and use varicap diodes? Please consider that I am a novice, so would be ok to use a clear and an exhaustive language/terms. Thank you. I often see these schematics: The first thing is: from what I heard, a…
Mister D
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How to empirically tune DQ current PI controllers in BLDC/PMSM motor for vector control?

I need to experimentally set the \$k_p\$ and \$k_i\$ parameters of PI controllers for the DQ-axes of a vector controlled BLDC motor. I have been looking for papers and application notes proposing practical tuning and fine tuning techniques, but…
raggot
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What kind of component was used in this demodulation circuit?

I was trying to gather components as well as some desoldering experience from an old television tuner when I found those little fellows: They were sitting next to an IC with the Code TDA 6160-2X. According to it's datasheet it's a Multistandard…
Gnarflord
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3 answers

Multi-tuning AM selector

I'm thinking about the design of an AM receiver frontend that needs to select between three channels. The community suggested that I investigate manually wound loop antennas, and they seem like a nice choice. AM loop antennas are designed for…
Reinderien
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Separating an FM antenna from a topology which uses headphone ground as antenna

I have a FM radio module with Silicon Labs Si4703 integrated tuner module for Arduino. The module assumes use of headphones and use of ground wire as an antenna (advice is wire length of 1.1-1.45m). In my use case that is unpractical, because the…
SaleB
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Television repair - connectors and standards for display panel and controller boards

All my experience comes from 2 flat TVs, so my knowledge is quite reduced and questions have to be quite broad. Questions: Are there standards or common practices from manufactures about connections on display panels? So, Is there a chance of…
Daniel Perez
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Tuning problem for an AM radio receiver

After some months I went back to try to make my AM radio work. This is the schematic: ANT is a 16 meters long straight copper wire (insulated). R1 and C2 gives a time costant \$ \tau = 114 \, \mu s\$ in between the fast carrier and the highest…
SirLeoncavallo
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Source generator for Satellite Tuner input

I need to design a source generator for a TV factory. They want to automatize the functional tests by applying a test module to the TV's at the end of the production line. All the peripherals of the TV (USB HDMI Satellite Terrestrial etc) will be…
Alper91
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Can antenna VSWR be corrected?

For this antenna, which cites a VSWR of 1.4, can that be improved (decreased) with the use of a matching network? Could the matching network be between the feed cable and the board or must it be between the antenna and the feed cable?
Reinderien
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IF transformer color codes

Is there any standard color code available for IF transformers? Generally in most of the Japanese radio receivers I see red color slug for MW oscillator, white and yellow slugs in AM IF stage, orange color slug for FM oscillator, blue, purple and…
Dilshan Jayakody
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