> 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.

    Well, to be more specific, I'm trying to
    convert KR19A (SlimFire Pocket Remote)
    into KR19E (Europe version).

    Opening up the unit, looks like just a simple
    LC tank circuit with a PIC keying the data code.

    If I'm not mistaken I just need to mod
    the LC circuit to change the modulation
    freq from 310MHz (US) to 433MHz (Euro).
    Just that without proper equipment, it
    becomes a guessing game.

    Any european PICLister having the KR19E ?

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

    Found a company, Linx Technologies, that
    produce low cost (~US$7) 433MHz tx module,
    may try to use that if LC mod fails.

> 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.

    No clock osc here, it's a PIC12C508A though.

> 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

    http://www.edcheung.com/automa/rf.txt

Thks,
Peter

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