I have seen some great advice from our fellow cable dogs, but I couldn't help but take notice of the tap value that your subscriber is connected to. I'm not sure if what I have to say will have any solution effect.
I noticed that you had said that you have swept the leg that you are fed from, but my question is, to what standard or precision?
In my experience "self-terminating" taps are an abomination. They truly do not terminate RF, they are just a hard line version of a drop splitter. I see nothing but forward common path reflections (standing waves) from these taps in the forward and reverse sweep pictures. To the degree that I can see it on the output TP of the amp that feeds it, and even another amp back upstream especially in the return path. The only solution that I have found aside from changing the tap to a tap that can be terminated (4port11, or 2port8 if you don't need the other two ports and you can spare 3 dB of signal both ways), is to make sure that all unused ports on the tap are terminated with a 75 Ohm resistive port terminator.
Might cut down on modulation distortion.
Just a thought!
Jeff
Re: The resolved Micro Tiling
Member #: 26836
Registered: 11/25/2003
Posted:
107
Name:
Jeff Guimont
Name:
Jeff Guimont
Company:
Summit Broadband
Occupation:
Headend Engineer
Location:
Fort Myers, FL
Personal:
50-ish
Experience:
~27 years
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