At 01:18 PM 7/12/2001 -0400, Rush wrote:
>Don't use amplifiers!
If you're in a fringe area putting a high quality antenna mounted amplifier
can improve things. The amplifier should be between the antenna and the
long coax run- not in the house. You will need a weatherproof amplifier
designed for this application. You can run a separate twisted pair to power
the amplifier or power it off the coax cable.
With coax power the transformer is in the house at the other end of the
long cable run. It injects DC into the cable but uses a DC block (usually
just a capacitor) to prevent the DC from getting to any TVs or other video
equipment. Coax power is convenient but a cheap power injector will
introduce noise into the coax and make it a waste of effort.
High quality units do exist. Many cable companies use coax powered
repeaters every N feet of cable. These repeaters are buried and many were
not designed for two way traffic. The slow roll-out of cable modems in many
areas is due to the need to dig up cables and install bidirectional repeaters.
-Erik
--
Erik Quackenbush, V.P. Operations, Midwest Filter Corporation
1-847-680-0566 fax: 1-847-680-0832 http://www.midwestfilter.com
///
/// shop-talk@autox.team.net mailing list
/// To unsubscribe send a plain text message to majordomo@autox.team.net
/// with nothing in it but
///
/// unsubscribe shop-talk
///
///
|