On Thu, Jan 19, 2017 at 06:13:18PM -0500, Matthew Miller wrote:
> I've been having trouble finding 433MHz receivers which work. I have
> a project designed for a SIP style module, but at this point I'll
> settle for any package as long as the receiver works. I have tried
> 4-5 different receivers and they all have had one of two modes of
> operation:
>=20
> 1. So many random pulses on the digital output as to be unusable.

If you mean when there is no transmission; this is normal for every
module I've used.  Something has to look at the random stream for
meaningful data.  Usually that something is a microcontroller; either
yours or one on the module.  When there isn't one on the module, it's
your job.

If you mean when there is a transmission; is it noise and does
filtering help?

> 2. Good reception, except the _middle_ of the bits of a byte are not
> output.

Not enough preamble can cause this; the receiver is not yet trained;
does the problem occur in a longer transmission?

> Only one module was in category 2, a RLP-434A from SparkFun. Funny
> thing is the module's analog signal strength output clearly showed
> all bits being received!

I couldn't find that one in a quick search.

--=20
James Cameron
http://quozl.netrek.org/
--=20
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