Subject:
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RE: About the elsema FMTR 2705
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Newsgroups:
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lugnet.robotics.handyboard
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Date:
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Thu, 8 Oct 1998 08:16:48 GMT
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Original-From:
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Joe Martin <joema@mpx.com.IHATESPAMau>
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Viewed:
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1354 times
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Michael,
I have tried to use the Elsema radios without the modem chips but
because 27Mhz is such a noisy frequency (at least here in Australia) I found
that I got way to much interference when interfacing directly to TTL. The
modem chips are really just tone encoder/decoder pairs and I still get some
interference when using them which must mean that the tones on which they
operate must occasionally be being received by the radios. As a result I
have had to slow my data rates down because I am using them in an
application where timing is critical, my app is nothing like RS-232. It may
be feasible to use them this way in other applications.
-----Original Message-----
From: Michael Stancombe [mailto:s344029@student.uq.edu.au]
Sent: Thursday, 8 October 1998 9:12
To: Joe Martin
Subject: About the elsema FMTR 2705
Joe,
I looked up both the ELSEMA radio link and the modem chips, and it looks
as though a wireless data link could be set up without a modem chip. It
seems both the FMT2705 and R2705 can handle TTL level logic input and output
respectively. Does this sound possible to you? Did you actually have to use
a modem chip for the receiver end at the handyboard?
Thanks for the tips in the last mail, they were much appreciated
Cheers.
--
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