Hi,

I've never used these sort of transceivers, but what I do know is
that when the transmitter is off (or out of range) the receiver is
succeptible to all sorts of other crap that is in the air. This is
my experience using other radio devices. With a strong carrier, the
other signals are much less likely to interfere.

As for the noise in the low state, how long are you staying low?
You should probaly use the high state for marking. This might make
it better too, because the low state will always only be short, and
your UART would help you suppress noise in the way it samples the
bits.



Andrew

On Thu, Apr 15, 2004 at 11:40:17AM -0300, Edson Brusque wrote:
> Hello,
>
>     I'm testing some transmiters and receivers modules (315MHz e
> 434MHz) from Keymark (www.keymark.com.tw). Transmiters are TXC1-0315 and
> TXC1-0434. Receivers are RXD1-0315 and RXD1-0434.
>
>     What I'm founding strange is that the receivers output random noise
> when the transmiter is OFF (or ON with data pin low).
>
>     This is ok? Am I doin something wrong?
>
>     It seens the receiving routine would need to ignore all this noise.
> I think it would be complex. Any good documents on this subject I should
> read before doing dumb questions?
>
>     I've tried to find something on www.piclist.com but it seens to be
> offline.
>
>     Obrigado,
>
>     Brusque
> --
> --
> ---------------------------------------------------------------------
> Edson Brusque                     C.I.Tronics Lighting Designers Ltda
> Research and Development                   Blumenau  -  SC  -  Brazil
> http://www.suporte.ind.br/ryan/netiqueta.htm     www.citronics.com.br
> ---------------------------------------------------------------------
>
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