[opendtv] Re: Wireles to DTV Inteference
- From: "John Willkie" <JohnWillkie@xxxxxxxxxxxxx>
- To: <opendtv@xxxxxxxxxxxxx>
- Date: Sat, 10 Sep 2005 16:06:26 -0700
not in my household, it won't "replace" anything -- more likely add another
way to communicate.
John Willkie
----- Original Message -----
From: "Richard Hollandsworth" <holl_ands@xxxxxxxxx>
To: <opendtv@xxxxxxxxxxxxx>
Sent: Monday, September 05, 2005 11:30 AM
Subject: [opendtv] Re: Wireles to DTV Inteference
> And soon after you rewire your house with RG-6, it will be become
obsolete.
> Wireless distribution from the SAT dish or CATV entry point will soon
replace RG-6.
> Sorry Belden....
> =================================================================
> ShLampen@xxxxxxx wrote:
>
> In a message dated 09/04/2005 7:40:39 AM Pacific Daylight Time,
> craig@xxxxxxxxx writes:
> It is ironic that the cable guys are now starting to focus on the
> integrity of existing in-home wiring as they deploy digital cable.
> With the analog tier, they could get by, as the interference
> generally did not prevent reception - it just reduced the quality.
> But with digital cable, it seems that in-home wiring deficiencies are
> causing digital cliff problems too. I guess it's time to rewire the
> house with RG-6 to improve my link margins...
>
>
>
> Dear openDTV,
>
> I'm sure you know a cable guy could not resist that opening above.
>
> There are a number of factors that affect cable performance, both in the
> manufacturing of the cable and in its installation. If I chose a cable for
a
> home install, I would base the decision on these factors:
>
> Bandwidth: I would want a cable with the widest bandwidth possible. And I
> would want that cable to be swept and tested to that bandwidth. You would
be
> amazed how much cable says 2.25 GHz or 3 GHz, and only every 10th roll or
> 100th roll is actually tested. There are even 75 ohm cables now tested to
4.5
> GHz.
>
> Return Loss. This one spec tells you mountains about how this cable will
> perform at its specified impedance (75 ohms in this case). The lower the
> number (larger negative number) the better the performance. -20 dB RL is
better
> than -15 dB, -25 dB RL is better still etc.
> If you want to know what that translates to, just say the word and I will
> post another email on that subject. Also, if you can get GUARANTEED return
> loss (very rare) that is worth much more than "typical" or "nominal" or
some
> other phrase.
>
> Crush resistance. A very hard number to find out for many cables, this
> tells you how much deformation (in weight) a cable will take before it
changes 3
> ohms in impedance. This tells you a lot in terms of installer-resistance.
>
> Shield effectiveness. Quad shields are not automatically the best shield.
> It's a question of braid coverage, plus braid material (aluminum is not as
> good as copper). If you can get the 'transfer impedance' number for a
> particular cable, that's the real thing. And that number will change with
> frequency, so you should have that value at a number of points throughout
the spectrum.
>
> There's my BIG FOUR. Each one of which could generate a couple of pages of
> details.
>
> Hope this helps!
>
> Steve Lampen
> Multimedia Technology Manager
> Belden Cable
>
>
>
>
>
>
>
>
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