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'[PICLIST] [OT] Modifying US X10 RF transmitter for'
2001\07\05@082320 by Peter Tiang

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This is OT, but it has a PIC inside ;-)

Anybody can recommend a good X10 hacking site.

I've a X10 RF transmitter from US (dirt cheap
at <US$10) but it's equivalent is selling in
the UK for 25pound. :(

As I understand, the difference is just
the modulation frequency. 310MHz in US,
433MHz for Europe.

Any ideas ?

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2001\07\05@110531 by Dan Michaels

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At 08:26 PM 7/5/01 +0800, you wrote:
>This is OT, but it has a PIC inside ;-)
>
>Anybody can recommend a good X10 hacking site.
>

www.nysaes.cornell.edu/cc/staff/pool/homeauto/
http://www.edcheung.com/automa/ha.htm

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2001\07\05@110740 by Justin Fielding

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Why would you need to modify it? I have some and they work ok.. or do you
mean turning it in to a PAL output rather than a NTSC?

> {Original Message removed}

2001\07\05@222343 by Peter Tiang

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I'm not talking about the TV signal transmitter,
which by the way, works fine. NTSC/PAL does not
matter as most TV here supports multisystem.

I'm interested in modifying the remote-control
transmitter from 310MHz (US) to 433MHz (Europe)
modulation freq.

----- Original Message -----
From: "Justin Fielding" <JFieldingspamKILLspamTVTRAVELSHOP.LTD.UK>
To: <.....PICLISTKILLspamspam.....MITVMA.MIT.EDU>
Sent: Thursday, July 05, 2001 11:02 PM
Subject: Re: [OT] Modifying US X10 RF transmitter for Europe use


> Why would you need to modify it? I have some and they work ok.. or do you
> mean turning it in to a PAL output rather than a NTSC?
>
> > {Original Message removed}

2001\07\05@232324 by Dan Larson

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On Fri, 6 Jul 2001 10:17:07 +0800, Peter Tiang wrote:

>I'm not talking about the TV signal transmitter,
>which by the way, works fine. NTSC/PAL does not
>matter as most TV here supports multisystem.
>
>I'm interested in modifying the remote-control
>transmitter from 310MHz (US) to 433MHz (Europe)
>modulation freq.

Judging from some interesting X-10 sites recently posted, it looks like
you may be able to replace the rf module inside the unit. They refer to
the transceivers having "rf boards". One would imagine that they
are simply decoding the digital output of a generic rf module.

It would be interesting to find out if a 433MHz AM receiver module
would work in place of the rf board in the transceiver.

I think the remotes use some variation of that "Designing for Dollars"
appnote on MicroChip's web site, which dedscribes a simple LC tank
driven by the clock oscillator and controlled by an output pin. The tank
was to be "tuned" to an overtone frequency of the crystal oscillator.

If you knew the format of the digital code keying the tank circuit, you
could build a 433MHz X-10 remote with your own PIC and TX module.

Dan

{Quote hidden}

>> > {Original Message removed}

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