Two Lock Rule?

AES -

If you aren't going into business - somebody should. I think it is a
neat idea although it would need a way to detect that the electronic
box is being crunched or shot at etc etc.

Cool------

The easy way to do that is with a positive signal system. That is, the
little transmitter chirps once every couple of seconds when things are
"good". When it stops chirping (batteries low, shot, crunched, or alarm
triggered) you light the alarm fuse.

Jim




"nrp" wrote in message
oups.com...
AES -

If you aren't going into business - somebody should. I think it is a
neat idea although it would need a way to detect that the electronic
box is being crunched or shot at etc etc.

Cool------

RST Engineering wrote:
The easy way to do that is with a positive signal system. That is, the
little transmitter chirps once every couple of seconds when things are
"good". When it stops chirping (batteries low, shot, crunched, or alarm
triggered) you light the alarm fuse.

That's not very expandable. If the system gets popular, you'd need lots of
frequencies; otherwise your alarm might fail to sound when your item is stolen
because someone else close by is on the same frequency.

George Patterson
"Naked" means you ain't got no clothes on; "nekkid" means you ain't got
no clothes on - and are up to somethin'.

Then you chirp a digital code. A simple 16 bit code gives you 64K discrete
addresses. Ain't that many airplanes on the field at Oshkosh at one time.

Jim


"George Patterson" wrote in message
news:EPTie.9665$E05.6247@trndny09...
RST Engineering wrote:
The easy way to do that is with a positive signal system. That is, the
little transmitter chirps once every couple of seconds when things are
"good". When it stops chirping (batteries low, shot, crunched, or alarm
triggered) you light the alarm fuse.

That's not very expandable. If the system gets popular, you'd need lots of
frequencies; otherwise your alarm might fail to sound when your item is
stolen because someone else close by is on the same frequency.

George Patterson
"Naked" means you ain't got no clothes on; "nekkid" means you ain't
got
no clothes on - and are up to somethin'.

"George Patterson" wrote

That's not very expandable. If the system gets popular, you'd need lots of
frequencies; otherwise your alarm might fail to sound when your item is
stolen
because someone else close by is on the same frequency.

Nah, yah gotta think digital. It has to be chirping your digital code, not
just frequencies.
--
Jim in NC

On Thu, 19 May 2005 00:20:04 -0400, "Morgans"
wrote:


"George Patterson" wrote

That's not very expandable. If the system gets popular, you'd need lots of
frequencies; otherwise your alarm might fail to sound when your item is
stolen
because someone else close by is on the same frequency.

Nah, yah gotta think digital. It has to be chirping your digital code, not
just frequencies.

And when you get two on the same frequency is it possible for one to
swamp the other. If you use something like WiFi to set off an alarm,
or call home, that's different as the networking *should* take care of
collissions and multiple systems can coexist on the same frequency.


Roger Halstead (K8RI & ARRL life member)
(N833R, S# CD-2 Worlds oldest Debonair)
www.rogerhalstead.com

In article .com,
"nrp" wrote:

AES -

If you aren't going into business - somebody should. I think it is a
neat idea although it would need a way to detect that the electronic
box is being crunched or shot at etc etc.

Cool------

Thanks!

One could also get more complicated and have the lock and the remote
system in continuous wireless communication, to make sure the lock is
still intact -- but then there are more ways for the false alarm rate to
go up.