Re: X-10 RF Freq Mod

[Just Another Joe <address@xxxxxxx>]

Hi Dave,

For some reason, I've just seen your replies today, even though sent two
days ago.

On Wed, 20 Dec 2006 00:51:10 GMT, nobody@xxxxxxxxxxxx (Dave Houston)
wrote in message <45888396.382829218@xxxxxxxxxxxxx>:

> Just Another Joe <address@xxxxxxx> wrote:
>
> >My question is, can X-10 transmitters such as palmpads, slim-switches
> >and motion-detectors, be [easily] tuned to 315MHz?  If so, one could
> >have, for example, motion-sensors on 315MHz and controllers on 310MHz,
> >to prevent one from stomping on the other.  Is that feasible?
>
> No. X-10 transmitters are not easily tuned - most can only be tuned by
> bending the wire loop that forms part of the resonant circuit and you need
> sophisticated equipment to do this accurately...
>
> 315MHz and 310MHz are also close enough that strong signals will be received
> from either frequency by the superregenerative receivers typically used. You
> need more separation.

Yes.  In later reading through some X-10 forums, I saw mention of the
x10.com transmitters being /very/ loose in frequency, so I suspected
310MHz and 315MHz would be too close.

> However, RF interference from multiple transmitters is not much of a
> practical problem. PLC interference when various receivers try to send to
> the powerline simulaneously is the "usual suspect".

This is interesting.  As you know, I'm planning on switching to Insteon,
but hope to keep the X-10 RF (and plug-in) transmitters for control at
least until suitable Insteon versions are available.  And, to interface
them to the Ocelot via roZetta, rather than via RR501's as they
currently are.

But I recently dusted off some X-10 motion sensors to try again, and
found that I was frequently getting collisions when sending palmpad
commands.  So from what you said above, would you suspect that the
collisions were occurring on the PLC side, rather than the RF side?  If
so, then without the PLC in the picture, perhaps palmpads and motion
sensors can co-exist peacefully?

--
Just Another Joe        Remove .windows to reply.
Why be politically correct, when you can be right?