SAW vs. Crystal


Old 09-18-03, 06:57 AM
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Question SAW vs. Crystal

Hello from a newbie on this forum. I spend most of my forum time on the "Elecetrical" forum especially while I was building my home. Now that's it's built, we're looking at alarm systems. Don't ask why we didn't pre-wire--long story. But as a result we're looking at wireless systems.

The one that stands out is the Simon 3. We are looking at the version with X-10 capability (lots of that working well in my home now) but without the 2-way voice feature.

Here's one thing I'm still confused about. What's the difference between a SAW sensor and a crystal sensor? In researching system, I've come across retailers (not just Simon 3 dealers) who sell starter packages that are very similar except that one includes a few SAW sensors, whereas the other has crystal sensors. What's the difference and why would I want to use one over the other. Prices seem to be comparable.

Also, the wireless door sensors seem so <big>BIG</big>. I noticed that there are recessed wirelss sensors that are compatible with Simon 3. They seem much less obtrusive, and I understand that the sensor must be returned to TIT for battery replacement (15 year battery supposedly). Any other pro/cons associated with this approach?


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Old 09-18-03, 07:10 AM
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At the risk of replying to my own post...

Here's what I'm referring to. Descriptions very similar. Similar sizes. One uses Alaklines, the other lithium batteries.
Old 09-18-03, 12:43 PM
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<a href="">Here's an old thread</a> (from last December) where I explained a few of the differences to another member.

Ignore the part about not using Simon 3 and still using Simon 2 - I'm using strictly Simon 3 now (great system, btw.)

I have also used the recessed sensors, and I think they're great - especially if you want something unobtrusive and hidden. They can be used on doors or windows, and the batteries do last a long time (I have yet to see how long, as I've only been in the business 5 years )

There may also be another option, the <a href="">Micro Door/Window Sensors</a> are a little larger than a quarter and are just as easy to install. I've also installed several of these sensors and never had any issues. ITI does a very good job with wireless equipment - definitely the best on the market, IMO.

Let me know if there is anything else I can help you with.
Old 09-18-03, 01:14 PM
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Thanks Brandon. The packages seem to come with a couple of SAW transmitters. I'll probably use those on some less visible doors and use either the micro sensors or the recessed ones for aesthetic reasons. I'm a woodworker and have a nice jig that will allow me to drill a nice straight perpendicular hole in the edge of the door.

On another note, what do you think about the ITI Toolbox for Windows software. It's not very expensive, but I'm not sure what it really does.

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