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neeraj kaira
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What is the use of inductor in a receiver? It amplifies the signal or it only blocks the high frequency signals?
PhysicoRaj said:The inductor in a reciever is the part of a tank circuit, you may call it a tuning circuit which selects the frequency ( your station).
PhysicoRaj said:Not concerning the details of the circuit, I hope this will do: Increase the input voltage. Add an amplifier (you will find details on these at the flick of a search in google). Increase your antenna length, or try to direct the signals in a particular direction you want. And this one :http://www.zen22142.zen.co.uk/Analysis/efftxd.htm
neeraj kaira said:I have a transmitter which sends the signals 90-120 mhz due to a variable capacitor 0-100 pf but the range of this arrangement is only 10-15 metres :( i want to increase the range what should i do?
meBigGuy said:...
Generally, the frequency at which the inductive reactance equals the capacitive reactance is called the resonant frequency.
Because only for this one frequency Xc = XL and for the parallel tank circuit equivalent impudence reach his maximum value. So only for this frequency no current is drawn from the source. And this means that the current is circulating between the inductor and the capacitor, so we have a resonance circuit.anhnha said:I always wonder why the LC tank resonates at the resonant frequency not other frequencies.
It would be great if you could explain it.
anhnha said:I always wonder why the LC tank resonates at the resonant frequency not other frequencies.
It would be great if you could explain it.
meBigGuy said:The capacitive reactance is opposite sign of the inductive reactance, and they are equal at the resonant frequency, so they sort of cancel (in a series resonant circuit). But only at the resonant frequency. The remaining resistance (which cannot cancel) determines the quality of the circuit, which is called the Q. The higher the Q the narrower the tuning bandwidth.
http://www.electronics-tutorials.ws/accircuits/series-resonance.html
http://www.electronics-tutorials.ws/accircuits/parallel-resonance.html
Regarding your transmitter... How do you know the fault is not with the receiver? Or the antennas? Are you using properly designed antennas and connecting them with properly matched transmission lines?
neeraj kaira said:Receiver is my cell phone so i think it can't be the problem ..
sophiecentaur said:What frequency do you think your phone is using? How do you think it can receive the signals you are producing?
sophiecentaur said:Are there any Analogue cell phones around, these days?
And, if you look at this link you will see the operating frequencies.
This is what you wrote.neeraj kaira said:I transmit the signal using a mic and receive via my cell phone ...but range only 10 metres :(
neeraj kaira said:Listen i made a circuit which sends the signal at 90 - 120 mhz and i receive them using my cell phone by setting the fm radio at the desired frequency...
sophiecentaur said:One more comment. Was your transmitter bought or did you make it? It may just not be working optimally. You can make a vast difference to equipment, working at those frequencies by bending and tweaking coils and leads. You have the problem of not much available test gear, of course, which makes things doubly difficult.
meBigGuy said:Is unlicensed fm transmission still limited to 100mW? I think it is.
The schmatic has been posted already in post 8.
I'd try making C2 a variable cap and see if it helps the antenna match.
What are you using for a transmit antenna?
Look at http://www.circuitstoday.com/2-km-fm-transmitter for a better design.
To improve the range of your 100mW FM transmitter, you can try using a higher gain antenna or adding a power amplifier to increase the output power. Additionally, optimizing the transmitter's circuit design and using high-quality components can also help improve the range.
The most important factor to consider when designing a 100mW FM transmitter is the stability of the frequency. This can be achieved by using a high-quality crystal oscillator and properly tuning the circuit to the desired frequency.
No, a 100mW FM transmitter is not powerful enough for commercial broadcasting. It is only suitable for personal use or small-scale broadcasting within a limited range.
To reduce noise in your 100mW FM transmitter, you can use a low-noise amplifier, shield the circuit from external interference, and properly ground all components. Additionally, using high-quality components and properly tuning the circuit can also help reduce noise.
The ideal power supply for a 100mW FM transmitter is a stable and regulated DC power supply. It is recommended to use a power supply with a voltage slightly higher than the operating voltage of the transmitter, to ensure stable and consistent performance.