Re: Modulated Channel Interference

You have it setup like this?:

                OUT    IN
---CATV---[LPF]--(DC-12)------TV Distribution
                  /TAP
    [Modulator]--/

The LPF should be no less than 550MHz.  With it connected as such, the 
modulator is connected directly to the combiner.  If you have your 
modulator set to channel 74 and there is a digitally modulated carrier 
on channel 74, you're gonna have problems.  Utilizing a low pass filter 
that notches everything above 600MHz, notches out anything that might be 
coming from the cable company above that 600MHz (ch 86).  I have 4 
channels combined that way with no problems at all.


CIAO!
Ed Nielsen
CENCOM
http://www.cencom94.com


Barclay Berger wrote:
> I recently bought a 3-channel modulator and installed it on my home cable
> system.  I found out that I was getting serious noise due to not having a
> low pass filter on the line so I purchased on of those.  Still not real
> happy with the results.  Now my channels 2-6, 16-21 are fuzzy and probably a
> few others.  The modulated channel isn't even that clear.  If I just hook
> the modulator into the combiner the modulated channel is very clear. I
> thought purchasing the low pass filter would solve this but it seems to have
> created a few other problems.  I'm thinking of scrapping everything and
> returning, getting expensive.  Any suggestions before I do?
>
> Thanks
>
> Barclay