Hello
This is the first post in this forum
I want to make a Circuit to send and receive data
I want to use 2 Crystal (20mhz)
Such as those found in games (Games Car)
Hello
This is the first post in this forum
I want to make a Circuit to send and receive data
I want to use 2 Crystal (20mhz)
Such as those found in games (Games Car)
20 MHz or 20 mhz? 20 millihertz isn't a practical radio frequency. 20 MHz is already licensed in most countries.
de KI6RWX
20Mhz
20miga
Function is transfer the sound from place to another
Distance is 10 meters
But the important thing is to use the crystal because its very accuracy (20.000Mhz)
Thank you for mneary your reply
There are inexpensive commercial units you can buy that will do what you want 16, why are you trying to build the circuit yourself?
"Because I be what I be. I would tell you what you want to know if I
could, mum, but I be a cat, and no cat anywhere ever gave anyone a
straight answer, har har."
Inexpensive commercial units would be legal to use, and a 20MHz transmitter would not.
de KI6RWX
You would have to have a LONG antenna for that frequency if you want it to be very effective.
Austin
Not necessarily EN, all those clocks you see in the US that advertise they're atomic get their signal from a 5 10 or 15mhz signals from Colorado. They don't have very large antennas.
"Because I be what I be. I would tell you what you want to know if I
could, mum, but I be a cat, and no cat anywhere ever gave anyone a
straight answer, har har."
thank you,,
I want to understand how it works
And do one
I have many equipments ,coil, transistors....
and
I want to use it
why large antenna?????Originally Posted by Sceadwian
in car game (27Mhz) antenna is 20cm
the Differences is 7 Mhz!!
please help me
a radio Receiver ???
any Receiver for any wave ???????
pleeeeeeeeeeeeez help
If I were you then I would try some of these circuits.
For the inductor values, if you don't get the frequency right then try this website:RADIO CALCULATIONS
For the Low power fm transmiter:
When assembling the fm transmitter circuit, make sure the rotor of C3 is connected to the +9V supply. This ensures that there will be minimal frequency disturbance when the screwdriver touches the adjustment shaft. You can use a small piece of non copper-clad circuit board to make a screwdriver – this will not alter the frequency.
Q1 is a conventional Colpitts oscillator design. The audio signal applied to the base of Q1 causes the frequency to change, as the transistor’s collector current is modulated by the audio. This provides the frequency modulation (FM) that can be received on any standard FM band receiver.
The inductors are 9.5 turns of 1mm diameter enamelled copper wire. They are close wound on a 3mm diameter former, which is removed after the coils are wound.
The output is a low power of 100 mW, but for some of you this fm rf transmitter can delivers the desired power for broadcasting on your street or with a proper antenna you can cover a small neighborhood. If you need a power wireless fm transmitter use the above menu, you can find transmitters starting with low fm power up to high power fm transmitters.
but just a heads up if they catch you using this bandwith then you are in big trouble, and FYI HAM Radio operators are crawling all over this bandwidth, I would try a much higher frequency (500 Mhz) remember that the data tranasfer rate cannot exceed the transmit frequency.
-If we knew what we were doing, then it would not be called research.
Albert Einstein
-Real men don't use volt meters, they stand in a bucket of salt water and use their bare hands.
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Vince Reynolds
thank you but this is transmitter
I need to Receiver circuit ,thank you
What sort of range do you expect to get? Why 20MHz what's it for?
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