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Posted by manowak via HWKB.com on September 2, 2006, 3:25 pm
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For anyone curious as to the final disposition, there has been some drilling
of holes in floors and some rewiring done. Downstream, I was losing 3.5 dB
due to an unecessary splitter in the pipeline, and given the length of the
internal wiring in the house, going to any of the existing cables upstairs
(rather than starting at the point of entry of the cable into the house)
knocked another 3.5 dB off, which put me at the hairy edge of being connected.
To Ed N.: Yes, my system is 256 QAM. The house is probably a bit further
from the groundblock than normal (the driveway is 450' - the groundblock is
not nearly that far away, but it is a fair bit down the drive, maybe 100'?).
So, I am already losing a bit outside.
To $Bill: With 20-20 hindsight, yes, you're right, Warren's suggestions that
I dump a $3000 TV probably would have worked, his shielding suggestion would
have worked if it had actually worked when I put an iron cage over the modem,
and undoubtedly the heart of his suggestion to move the modem really was
"remove any extraneous splitters, and minimize the length of cable between
the point of entry and the location of the modem", and yes, it was far less
sarcastic than I deserved.
To Dave: Your archived replies to others on this site were actually very
helpful. Thanks.
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Message posted via HWKB.com
http://www.hwkb.com/Uwe/Forums.aspx/network-cable-modem/200609/1
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Posted by Ed Nielsen on September 4, 2006, 11:42 am
At 450', either your tap is running out extremely hot or you have RG 11
for your drop. Your signal level at the end of a 450' drop equates to
~15dBmV at the tap (550MHz). Right about where it should be.
256QAM runs at ~6dB below analog, which makes the video level at the
output of the 2-way splitter -1dBmV. I would install a 15dB drop amp on
the TV leg of the splitter, leaving the cable modem alone. You don't
want to have negative signal levels hitting your TV set. Plus you
could, if you ever decided to do so, activate other outlets in the house.
CIAO!
Ed N.
manowak via HWKB.com wrote:
> To Ed N.: Yes, my system is 256 QAM. The house is probably a bit further
> from the groundblock than normal (the driveway is 450' - the groundblock is
> not nearly that far away, but it is a fair bit down the drive, maybe 100'?).
> So, I am already losing a bit outside.
>
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Posted by manowak via HWKB.com on September 4, 2006, 11:58 am
Ed Nielsen wrote:
>256QAM runs at ~6dB below analog, which makes the video level at the
>output of the 2-way splitter -1dBmV. I would install a 15dB drop amp on
>the TV leg of the splitter, leaving the cable modem alone. You don't
>want to have negative signal levels hitting your TV set. Plus you
>could, if you ever decided to do so, activate other outlets in the house.
Yup. That has been done. There is now an amp downstairs, right after the
two way split, very near the other feeds into the house. I yet may activate
one of them, and feed it into my now mostly unused (but still fairly decent)
Linux workstation, if I every get ambitious enough to get around to
installing "Myth TV" on it. :) (I have a rather ambitious friend who
recently did that, and wrote a whole mess of S-lang scripts to run it via a
remote. But I have a feeling he talks to his wife far less than I talk to
mine...)
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Message posted via HWKB.com
http://www.hwkb.com/Uwe/Forums.aspx/network-cable-modem/200609/1
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