Which Modulation Do you think is best for sending encypted signals over a short distance of about a few hundred metres. Should it be PWM or PAM or PCM? As Communication is not my forte as I am a instrumentaion student so please help
All signals can be affected by noise, even digital. You can see by Shannon-Hartley's law that noise is a direct factor in maximum bit-rate.good day everyone,
one advantage of using digital communication over analog communication is that, when the signal is received, the data can be read even if there is some noise with it "PCM" because it is either 1 or 0. however, PWM and PAM can be effected by the noise. Also, if the data to be sent is originally analog like a human voise, you either use a FM or an AM. It is recommended to use FM since the noise mostly affect the amplitude not the frequency of the signal. this is a small project which is a FM transmitter which can transmit to a small distance. go to http://www.boondog.com
Click on Tutorials, then Wireless FM Transmitter.
or see the attachment.
THANK YOU FOR TAKING THE TIME TO READ THIS LOOOONG REPLY AND GOOD LUCK
If you are encrypting the data yourself, then have a data stream, just send it over an ASK link. In the past, I have used some devices from RF Monolithics, namely their 1Mb/s 900MHz ASK transcievers. Since it is an asynchronous link, you will have to work at it to recover you data.Which Modulation Do you think is best for sending encypted signals over a short distance of about a few hundred metres. Should it be PWM or PAM or PCM? As Communication is not my forte as I am a instrumentaion student so please help
by Jake Hertz
by Duane Benson
by Duane Benson