Questions tagged [tuner]

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I can hardly receive any DAB+ radio signals. What can I do to improve this?

I've got a very hard time receiving radio programs transmitted by stations in my vicinity via DAB+: The receiver is a Keystone-based Monkeyboard DAB+ / FM tuner board with analogous audio output and ...
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1 vote
2 answers
211 views

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\$ ...
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5 votes
2 answers
319 views

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, ...
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-1 votes
2 answers
154 views

Radio signals detection circuit

What kind of radio signals can I detect with this antenna/tuner circuit? simulate this circuit – Schematic created using CircuitLab How can I amplify the incoming signal? I guess I must use a ...
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2 votes
1 answer
250 views

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 ...
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56 views

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 ...
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  • 1,211
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1 answer
103 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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2 votes
1 answer
1k views

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 ...
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72 views

How do I pre-tune and verify a receiver frontend?

In the design and implementation of an RF receiver, I'd like to build and verify it stage by stage, with particular attention to impedance matching, noise figure and gain. If I had access to a ...
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2 votes
2 answers
268 views

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. ...
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2 votes
3 answers
211 views

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 ...
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1 vote
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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 ...
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2 votes
2 answers
573 views

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). ...
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1 answer
677 views

LC Tank Tuner for Super Regenerative Radio

There seems to be very little literature to explain the practical construction of a radio and how a super regenerative circuit actually act as a selector, amplifier, how a antenna is actually to be ...
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5 votes
4 answers
1k views

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=\...
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  • 803
-3 votes
1 answer
252 views

How to make a tesla coil play music?

I'm building a Tesla Coil for a science project, and I thought it would be cool if I could make it play music. Could somebody tell me how? I'm new to this so please keep it as simple as possible.
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1 answer
772 views

Why am I losing the signal when I attach this RF amp circuit and how can I correct it?

I am trying to follow this circuit diagram: Taken from (http://www.techlib.com/electronics/crystal.html) Using two oscilloscopes I am watching the signal on the tuner circuit and the voltage created ...
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2 answers
1k views

Make an RF transmitter: classic transistor oscillator or VCO module?

This question is about pros and cons of making an RF transmitter (eg in the FM band) in the classical way (eg. with a "transistor based" oscillator circuit, like this one which is very classic and ...
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  • 195
1 vote
1 answer
5k views

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, ...
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2 votes
3 answers
9k views

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 ...
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1 vote
0 answers
577 views

Does the rt2832u chip have enough bandwidth for ATSC?

I'd like to upgrade the audio/infotainment module in my 2009 Camry. I see several off the shelf solutions, but they don't have a builtin digital TV tuner and the processor isn't as fast as I'd like. ...
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8 votes
2 answers
456 views

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 ...
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1 vote
3 answers
207 views

Could transmit/receive turnaround be improved by having a heterodyne receiver switchable between high-side and low-side injection

In some of the small radios I've worked with such as the Nordic Semiconductor 24LE line, there is a significant (100us+) delay between transmitting data and being able to receive a response. By my ...
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4 votes
4 answers
3k views

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 ...
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0 votes
2 answers
260 views

Tuning the radio receiver

I am trying to understand how exactly to tune the Superhet receiver. In my simulations, I have attached to the initial frequency mixer---> A local oscillator and an AC signal source to model the ...
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1 vote
3 answers
1k views

Tuning a radio wave receiver

Variable capacitors are used in tuning many circuits of radios. I read the theory of basic tuning and resonance frequency. What I understand by changing the capacitor we change the resonance frequency ...
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