Denny Esterline wrote:

>> - Main function is to transmit the states (on/off) of two switches over up
>> to a few meters, usually less than a meter. 
 
> Maybe I'm missing something, but why not use an existing keyfob? There
> are several companies that sell complete units with or without matching
> reciever units, presumably these have whatever certifications are
> neccessary. 

This is what we're doing now to get something going, but it doesn't look as
if it were a suitable road for production, even for small quantities. I
think that it loses its FCC certification if I take it out of its case,
solder wires (from my switches) to it and put it in a different case, won't
it? 

> At least one company was offering to build custom keyfob enclosures for
> thier hardware, so you could have the best of both worlds (hardware with
> your brand on it and not need to do compliance testing) 

It's not really a keyfob that I need, in the mechanical realization, even
though the basic function is roughly the same. (The one difference is
probably that for a typical keyfob use the false negatives can be higher;
you just press the button again to open your garage if it didn't the first
time.) 

The difficulty seems to be that when you change the case (substantially,
not just the form of the button of a plastic case), the unit has to be
re-certified. Since parts of our case have to be metal, this is probably a
change that requires re-certification.

In any case, I'd appreciate any link or contact info for companies that do
this.

Thanks,
Gerhard

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