Robert, you dont feed he complete RF+data to the sound card; just the
unmodulated data. This can be tapped *before* it goes to the RF transistor
circuit. At this point, it is well within the capability of your sound card
to capture and display. A sampling rate set for 44KHz will be fine.

For more detailed explanation on this technique look up
http://www.laser.com/dhouston/ir-rf4dummies.htm

Regards,

Anand

----- Original Message -----
From: "Robert Ussery" <uavscience@FRII.COM>
To: <PICLIST@MITVMA.MIT.EDU>
Sent: Friday, July 18, 2003 10:21 AM
Subject: Re: [OT]: Raynor garage door opener protocol


> OK, I'll give it a try. My only concern is that the sampling rate may be
too
> low (what is it typically, about 40-150ish kHz?) of my sound card may be
too
> low to capture good data from the opener. I don't know what freq. the TX
is
> on, but I think it's in the MHz's since it has a 2" antenna in it. I'll
> check up on it though. BTW, wasn't there a thread a while back about using
> FCC ID's to find out stuff about different products? This TX has one on
> it... What's the website for looking 'em up? Thanks!
>
> - Robert
>
>
> ----- Original Message -----
> From: "Anand Dhuru" <ardhuru@VSNL.COM>
> To: <PICLIST@mitvma.mit.edu>
> Sent: Thursday, July 17, 2003 10:26 PM
> Subject: Re: [PICLIST] [OT]: Raynor garage door opener protocol
>
>
> > Hi Robert,
> >
> > Heres one way to confirm whether your system is fixed signal or code
> hopping
> > (as in Keeloq).
> >
> > Open the transmitter and try to identify the pin that is feeding the
data
> to
> > the actual RF transmitter; feed this to the sound card in your PC, and
> > record the signal as a wav file. Open it into a sound editor (something
> like
> > GoldWave, free download), and zoom/stretch  the signal till the
individual
> > bits start showing up.
> >
> > Repeat the process; if you get the same signal the 2nd time, your system
> is
> > indeed a fixed code system; will work fine with the universal garage
door
> > remotes. Alternately, since by now you would have seen what the signal
is
> > like, you could get a PIC to bit bang the code and drive one of those
> cheap
> > RF transmitter modules (around 8.USD at Rentron).
> >
> > Regards,
> >
> > Anand Dhuru
> >
> > ----- Original Message -----
> > From: "Robert Ussery" <uavscience@FRII.COM>
> > To: <PICLIST@MITVMA.MIT.EDU>
> > Sent: Friday, July 18, 2003 1:46 AM
> > Subject: Re: [OT]: Raynor garage door opener protocol
> >
> >
> > > ----- Original Message -----
> > > From: "Jeremy Darling" <jdarling@ASKPIONEER.COM>
> > >
> > >
> > > > Have you tried putting an RF meter (freq counter) on it and then
> hooking
> > > > your scope up to the antenna and the common on the chip?
> > >
> > > What RF meter? What 'scope? :O) I'm just a po boy!
> > >
> > > > Many times this
> > > > will let you see the freq that is being transmitted on and what is
> being
> > > > sent.  From their you just duplicate it.  With that setup it can't
be
> > > > too difficult :)
> > >
> > > Yeah, I'd love to, but I don't have the equipment. I might be able to
> read
> > > some of it into an SX, but that's pretty sketchy.
> > > Thanks anyway!
> > >
> > > - Robert
> > >
> > > --
> > > http://www.piclist.com hint: The list server can filter out subtopics
> > > (like ads or off topics) for you. See http://www.piclist.com/#topics
> > >
> >
> > --
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> >
>
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