PHONE DIALER ACCREDITED PP.TT.

SINCLAIR is an one channel PHONE DIALER, able to send, on the commuted phone line, the alarm messages previously recorded to the NOT volatile DAST memory, to the set numbers, previously saved on the NOT volatile EEPROM memory. Moreover it introduces a very important characteristic, the RING DETECTOR

A method used by the burglar in order “to block” the telephone dialer is the following: They find out the phone number of the dwelling they want to rob, then, an accomplice calls the number, while the other commits the infraction. In the moment in which the alarm system finds the intrusion, the dialer is connected to the line in order to make the alarm call… BUT instead calling, IT ANSWERS to the received call (RING) that the accomplice is making! The result: A communication is establish that can last the entire time of the theft rendering useless the installed device!!

WITH THE RING DETECTOR THIS IS NOT POSSIBLE ANYMORE
In fact SINCLAIR, in case of alarm, controls if there is an incoming call (RING), if affirmative, does NOT keep busy the line, but waits the conclusion of the incoming call (if there is NO answer the call ends after 40 sec.). Even it will be tried again to call the phone number, SINCLAIR will be however faster to take the line, engaging it, to this point, with the ALARM CALL!

The apparatus has been accredited some years ago, the only difficulty met was in the BURST, easy resolved eliminating a CONDENSER that I had put between MASS and EARTH (in order to experience the effectiveness….)