There are two main types of heat pumps: geothermal heat pumps and air-source heat pumps. A geothermal heat pump draws the heat from the ground, while the air-source type pulls the heat from the air outside.
RF cables are a type of coaxial cable that is used to send radio frequency signals. RF cables are often used to send video information to a TV set. Identification. RF cables can be identified by the connectors at the end of the cables. RF cable connectors have a single pin that plugs into the RF input on a TV or other device and a threaded piece of metal around the connector that can be used to secure the cable to the RF input port. RF cables are commonly used in cable TV and Internet connections.
OOOOHHH OOHHHHHH I know this one. Look on the back of your TV and look on the back of your DVD player. Chances are, they have different connections. An RF modulator is the go-between for your TV and DVD player. It accepts the coaxial cable from your TV and the RCA plugs from your DVD player. It does so much more and can be used in different applications, but this scenario covers 99% of the modulators uses.