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Craftsman — re-branded Chamberlain models sold at Sears. Those products have a "139" model prefix to denote that the Chamberlain Group made them for Sears. Clicker — a line of universal garage door remotes. Chamberlain, LiftMaster, and Craftsman have interchangeable parts, primarily the gear and circuit boards.
A residential garage door opener. The motor is in the box on the upper-right. A garage door opener is a motorized device that opens and closes a garage door controlled by switches on the garage wall. Most also include a handheld radio remote control carried by the owner, which can be used to open and close the door from a short distance.
The Model 39 bypasses the Chamberlain's rolling code system by imitating Security+'s resynchronization feature. The Model 39 transmitter sends three fixed codes in rapid succession; this either causes the door to open due to the first code or it causes the door to resynchronize and open due to the latter two codes. [1]
The system typically features three buttons, most often found on the driver-side visor or on the overhead console, which can be programmed via a training sequence to replace existing remote controls. It is compatible with most RF-controlled garage door openers, as well as home automation systems such as those based on the X10 protocol.
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Remote controls send a digital code word to the receiver. If the receiver determines the codeword is acceptable, then the receiver will actuate the relay, unlock the door, or open the barrier. Simple remote control systems use a fixed code word; the code word that opens the gate today will also open the gate tomorrow.
CableCARD support is most common on higher end televisions that include a special slot for the CableCARD and a built-in cable tuner. The card acts like a unique "key" to unlock the channels and services to which the cable customer has subscribed, and the television's remote-control will also control the cable channels.
There are a number of sources available covering the history of Jerrold and the cable industry as a whole. Parsons, P. Blue Skies: A History of Cable Television Temple University Press, 2008 Extensive history; Stubbs, G. From workhorse to icon. The 704 Jerrold Field Strength Meter CED Magazine, November/December 2004, p. 42