December 2006 Online Tech Talk Q & A

Q: I have a customer who has an existing wireless system and wants me to install an acoustical glassbreak detector. The only problem is that the wireless system does not have glassbreak detectors. Any suggestions?

A: Yes. I ran into the same problem a while back and found that GE makes an acoustical glassbreak detector module that can be used with a variety of wireless devices. You can get it in either a 3 volt or 9 volt version and it is powered off the existing transmitters battery. It is the Sentrol brand model number 5845-D addressable Shatterpro® glassbreak sensor. Also make sure to get the GE/Sentrol glass break tester for testing the module.

Q: I have just added an extra monitor to a convenience store owner’s existing CCTV system. The picture from the monitor was great before I installed the extra monitor, cable, and connector. But when I add the new monitor I get a double image. When I remove either one of the monitor connections from the coax “T” connector coming out of the switcher they each work fine and I get a good picture. I tried another “T” connector and still had the problem. What is the problem?

A: You do not want to use a “T” coax connector to split a signal in a CCTV system. You have created an impedance mismatch by doing this. Most CCTV monitors have a looping in/output. Loop the video feed for these two monitors through the first monitor and terminate at the second monitor. Make sure to select the 75 ohm termination setting on the second monitor and not on the first. You can also look at using a VDA (Video Distribution Amplifier) for multiple CCTV feeds.

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