[s-cars] IR to RF conversion

[chris chambers]

teddy,

I have two 93 S4's and want to convert them both to RF. 

Do you know if this system will allow me to program both cars into both
remotes. That way we could both have one remote that would unlock both
cars?

Thanks
Chris


--- Theodore Chen <tedebearp at yahoo.com> wrote:

> > i'd like to convert it to RF, and was looking at the link that bill
> > posted some time ago:
> > http://www.mnsi.net/~natwhite/Audi/lock.htm
> > http://www.mnsi.net/~natwhite/Audi/Images/audialarm.jpg
> >
> > has anybody here done this conversion?
> > i'm also wondering why he used relays for the pin 4 and pin 3
> connections.
> > i understand he wanted to ensure that positive voltages never got
> applied
> > to the factory alarm inputs (which are expecting a negative
> voltage), but
> > why not use diodes?
> 
> i bought the prestige APS-25CH, which is similar to the APS-25KB 
> recommended in the above link, but it has code-hopping and
> double-pulse
> unlock capability.  this latter feature is more important, as it
> enables
> you to eliminate one wiring connection and a relay.
> 
> instead of simultaneously triggering the unlock wire and disarm wire
> as
> in the above link, my APS-25CH triggers the disarm wire twice by
> sending
> two ground pulses.
> 
> the APS-25CH does indeed flip-flop as described in the link.  on its
> unlock wire, it will send a ground pulse when you hit unlock, and
> send
> a +12v pulse when you hit lock.  so you need to make sure that the
> 12v
> pulse doesn't get through to the factory wiring.  instead of using
> relays,
> i used diodes.  59 cents a pair from radio shack, and i prefer solid
> state
> to electromechanical devices.
> 
> incidentally, the link is misleading in that there is no -12v line. 
> it's
> ground (zero volts).
> 
> my alarm has another channel that i was going to use to trigger the
> window/sunroof close feature, which i disconnected after my central
> locking
> module started triggering it randomly.  however, the alarm only
> provides
> a short ground pulse.  the window/sunroof closing feature runs only
> while
> it's receiving a ground signal, so a short pulse does nothing.  does
> anybody know of a relay with a short timer built in?
> 
> -teddy
> 
> 
> 
> 
> 		
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