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RF Transmitters and Receivers?

jeff77789

Feb 23, 2013
17
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Feb 23, 2013
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I've been trying to use this pair of RF transmitter/receiver:

https://www.sparkfun.com/products/10534
https://www.sparkfun.com/products/10532


does anybody have any experience with what type of signal it actually sends/receives?

you see that in the datasheet for the receiver you have a digital output and a linear output as well.

I sent a pwm type output through this and it looks like it kind of successfully transfers but the signal is very noisy, disrupting the pwm signal. i dont think an analog voltage signal would transfer

thanks
 

jeff77789

Feb 23, 2013
17
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Feb 23, 2013
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17
okay so i finally figured out to find a digital signal to send through these. there is another problem that comes up:

1. the signal being sent to the transmitter is 9600 baud which is 2x the 4800baud for the tx/rx (which i do not know if it affects the signal any)

2. when i view the signal, it is very noisy and it looks like it is just random numbers. the thing is, if i turn off the Tx, the values stay in their random state and it looks like there is no uniformity
 

brevor

Apr 9, 2013
87
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Apr 9, 2013
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87
1. Sorry, you can't send 9600 baud data through a TX/RX that only supports up to 4800 baud.

2. Im not sure what you mean by this. Please explain a bit more.
 

(*steve*)

¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd
Moderator
Jan 21, 2010
25,510
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25,510
Yeah, I'd certainly be trying to get it to work at 4800 baud before pushing it beyond its specs.

It *may* work at 9600 baud, but it may do so only with a very high signal, low noise, etc. Or it might not work at all.
 

jeff77789

Feb 23, 2013
17
Joined
Feb 23, 2013
Messages
17
Now I am at the point where i can send a digital signal at 4800 baud through these sensors.

The thing is, If it send "123" on the other side, i rarely ever get the "495051" sequence (refer to ASCII table)

the accuracy rate is less than 10% and I have no Idea why the signal is so "noisy"

is there any way i can improve on this?
 
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