TWS433&RWs433

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hey,
i have a pair of these radios and i dont seem to get much range out
of them. I am using the matched transmitters running them both off of
+5v. I have heard of increasing the range by boosting the power to
the transmitter but i am not sure how to do that because the serial
signal out is a modulated ttl (0v and 5v).

any suggestions would help!

thanks!
kevin