What is CATV? What are CATV cables?

CATV cabling consists of 75 ohm coaxial cables commonly known for transmission of Cable TV signals, but is also used with Ethernet 10Broad36 networks.

CATV stands for "community antenna television".

CATV cabling is used for "broadband" transmission -- as opposed to the "baseband" transmission used by all other Ethernet physical layers.
A broadband cabling system supports transmission of multiple services over a single cable by dividing the bandwidth into separate frequencies, with each frequency assigned to a different service.
This technique is used in cable TV transmission systems to transmit multiple channels over a single cable. Each channel uses a different frequency range.
This capability can allow 10Broad36 share a single cable with other services such as video.

F type coaxial connectors (CATV coaxial)

Coaxial Cable Signal Loss

The main downside of coaxial cable is its relatively high loss over distance.
Coaxial cable signal loss is a function of its diameter, dielectric construction, temperature, and operating frequency.
A ballpark figure is 1 dB of loss per 100 feet.

Coax used for Ethernet networks is 50 Ohms. Coax for cable tv (CATV) is 75 Ohms.


Digital CATV Spectrum Allocation

Analog Channels: Ch. 002 - 078 ----- 55 MHz to 547 MHz

Digital Channels: Ch. 079 - 136 ---553 MHz to 865 MHz


A two-way split causes a 3.5 db loss on each line.

You can buy cable tv amps, but keep in mind that you must amplify a clean signal. Take a faded signal and you'll just amplify the noise making things worse.

"In 1989, General Instruments demonstrated that it was possible to convert an analog cable signal to digital and transmit it in a standard 6-MHz television channel.
Using MPEG compression, CATV systems installed today can transmit up to 10 channels of video in the 6-MHz bandwidth of a single analog channel.
When combined with a 550-MHz overall bandwidth, this allows the possibility of nearly 1,000 channels of video on a system. In addition, digital technology allows for error correction to ensure the quality of the received signal. "

If you need to extend your existing cable wire, you will need a second cable jumper of the correct extension lenght. You will also need a double female F-81 connector, commonly referred to as a barrel. Screw the two cables onto the barrel and wrench tighten.