How do I build a radio that receives a ~20khz signal?
I am trying to build a radio to receive a 200 hz - 20 kHz signal. Can anyone give me a starting point as to what specific parts I would need (breadboard, operational amplifier, transistors, resistors, antennae, etc..)? The signal frequency is the most important thing for this project.
- HyperDogLv 78 years ago
Transceiving via a 200 Hz carrier, even a 20 KHz carrier is going to be pretty difficult.
Therefore, I'm going to assume that the 200 Hz to 20 KHz frequency range is the baseband frequency, that is, plain old audio.
The simplest would be to build an AM transmitter and receiver, where the transmitter carrier is amplitude-modulated. That is the easiest to de-modulate at the receiver.
As for parts, there are too many to list, and you also didn't say if you can use any chip-level devices (both Tx and Rx devices are available and require very few external components to create fully-functional transmitters and receivers), or if you want to try to build this using discrete components.
Yes, you'll need a breadboard of the type that allows you to easily plug in, move and remove parts and wires.
- 7 years ago
Your best bet is to look online for some circuit diagrams although their may not be any available as I remember wanting to do something similar for 10Hz. I've built a receiver that goes from 30KHz upwards but nothing lower then that. You'd also need a mighty huge antenna for that low frequency.
Its a very interesting project, they say that the human brain runs on 16Hz.
Good luck with your project.Source(s): Ham radio
- Anonymous8 years ago
that is VERY VERY low F for radio. start with basic electricity books
only the military with special equipment and antenna farms many miles long can do the 200 Hz
do the wave length calculation C = L * F
when I was a kid ( back in the stone age) we made "crystal radios" with wrapped wire, and "cat's whisker" diode, and homemade or sore bought capacitors
people who do this are called "radio hams" and there are few still aroundSource(s): Have fun you will learn a lot
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- 4 years ago
hi Dimitar! sure they do, frequently lots to the unhappiness of the radio astronomers making use of the telescope who're attempting to %. up truly faint indicators from distant products in area. fortuitously, they might frequently clear out maximum of those stray indicators out. :)
- adavielLv 78 years ago
To receive a 20kHz signal efficeintly you'd need a dipole antenna 15km long.
For 200Hz, 1500km long
- PrometheusLv 77 years ago
most important are the antenna and the capacitor which works in conjunction with it... These should be tuned to this frequency.Source(s): electronics