Newsgroups: comp.dcom.cabling
Subject: Re: RG-59 & Amplifier?
References: 
"Crypt"  writes:

> Hi all,
> 
> I have cheap RG-59 cable running through the house.  (I'd say maybe 200ft 
> total)  It is also split 4 ways with a 120db isolation 5-1000mhz splitter. 
> The TV's and cable modem at the end of the cable have a lot of shadowing and 
> other noise.  The cable modem also occasionally will lose it's connection.
> If I were to install a single port electroline 15db amplifier, would it 
> resolve some of these issues?  I have read RG-59 cable is cheap and there 
> are better cables, but I'd prefer not to re-wire the whole house if 
> possible...

Shadowing is caused by poor impedance matching in the system. 
There is somethig wrong between the signal source and the receiver. 
Check the incoming signal quality. If ghosting is not in the 
signal coming to your house, then the problem is in your in-house 
wiring. You will need to correct that impedance matching problem 
in the wiring. It maybe bad connection, damaged cable, 
unterminated splitter output etc...
An amplifier will not help to get rid of ghosting!

Amplifier can help to get rid of some noise or redice 
the effect of it. Amplifier needs to be installed 
on the beginnign of your long cable and able to push 
high enough signal levels to cable so that the signal 
is still adequate on the other end. 
Sometimes noise could be cauised by poor cable system 
shielding picking up RFI. 


-- 
Tomi Engdahl (http://www.iki.fi/then/)
Take a look at my electronics web links and documents at 
http://www.epanorama.net/