Re: X10 AGC and Insteon

["Jeff Volp" <JeffVolp@xxxxxxx>]

There isn't really much time between the 3rd burst and the Insteon window,
but I did consider the other slots.  X10 shows the 3 phase transmissions
being precisely timed.  I wonder how closely X10 transmitters actually match
those numbers.  The important thing is to hit their 650 uS reception window
on the other phases.  I would allow tolerance on both sides, reducing the
possible sample window.  It also gets the sample up near the peak where most
of my line glitches occur.

I coded this up last night using the first mS of the Insteon window (just
before the zero crossing).  It worked very well.  It turns out I have an
excellent source of continuous noise from the 4 ceiling CFs in my workshop.
These are not on an X10 circuit, and are unfiltered.  After amplification,
they generated a couple hundred mV of high frequency noise, and my weakest
X10 test signal was not much stronger.  The AGC knocked out the noise but
allowed the X10 signal through.

Unlike my earlier version, this works independently on each half cycle.  So
in the presence of an Insteon signal, the sensitivity will return to normal
as soon as the Insteon transmission ends.  This looks like a workable
solution.

Jeff

"Dave Houston" <nobody@xxxxxxxxxxxx> wrote in message
news:453f3987.1046675093@xxxxxxxxxxxxxxxx
> How about using the time after the third 120kHz burst and before the
Insteon
> window? Or the time between the other 120kHz bursts?
>
> "Jeff Volp" <JeffVolp@xxxxxxx> wrote:
>
> >"Dave Houston" <nobody@xxxxxxxxxxxx> wrote in message
> >news:453cd54d.889944843@xxxxxxxxxxxxxxxx
> >> I would sample outside the X-10 and Insteon windows.
> >
> >It turns out that wasn't as simple as it first appeared.
> >
> >It was easy to sample between zero-crossing Insteon/X10 windows, and that
> >worked perfectly for X10 data from the Ocelot.  However, nothing was
> >received from a palm pad.
> >
> >It turns out the extraneous 3-phase transmissions from the RR501 appear
as
> >noise in the AGC window, and the AGC dutifully reduces sensitivity so
that
> >X10 signal is ignored.  I guess that shows the AGC is working.
> >
> >The solution may be to just sample during the first half of the Insteon
> >window for each half cycle.  If the XTB-II tunes out any Insteon "noise",
it
> >might even be able to receive a strong X10 signal occurring at the same
> >time.  If the Insteon signal is as strong as the X10 signal, the message
> >would be rejected anyway due to collisions.
> >
> >Jeff
>
> http://www.davehouston.net
> http://tech.groups.yahoo.com/group/roZetta/
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