• RF controls typically have a pair of transmitters, like the infrared transmitters in remote controls.remote control image by Kelly Kane from Fotolia.com
  
  The RF remote plug on home audio and DVR devices is a way for one device to send control signals to another device, usually with the goal of using the recording device to control the channels and volume on a cable or satellite box. Typically, the RF controller mates codes in the device's original remote controls. It works on the same principle as a universal remote control.
  
  

RF Plug

• On the back of most programmable recording devices, such as DVR and TiVo, is a serial plug marked "RF Controller." It usually resembles the VGA ports on standard computers.
  
  

What It Does

• In the device's manual is a series of codes that are unique to each brand of television and cable/satellite box manufacturer. When entered into the DVR or TiVo, the codes carry the same signal of the device's original remote control.
  
  

How It Works

• Each device manufacturer builds into electronics devices a specific frequency and signal for infrared remote controls. This is to prevent one controller from accidentally changing another device. The codes are industry-known; RF controllers on the backs of recording devices are able to use these codes when switching to channels that users want recorded.
  
  

Other Devices

• Just about anything -- from draperies to interior lighting to car starters -- can be controlled with an RF remote, provided the RF plug is manufactured for such an application. A drapery motor, for instance, would plug into the RF controller, which is plugged into the wall. The draperies close with the push of a button from anywhere in range. The same applies for lights and remote starters: No line of sight is necessary.