802.11G health issue and home network cabling question

decaturtxcowboy <nope_none_@nowayspam.com> hath wroth:

>Jeff Liebermann wrote:
>> Are you sure about that? I got into an argument about the proper
>> spacing of Arrow T25 type staples.
>
>The network card LAN lights lite up, and no shorts and good continuity
>in all the pairs.

Ok. If you had continuity (and not split pairs), then all that's left
is crosstalk and reflections.

>It was a 150 ft run. I suppose one could try to
>duplicate it with some very very tight skinny nylon wire ties and see
>what happens.

Pass. My hands were a wreck after about 200 staples. I couldn't play
piano for 2 days. If I'm going to do nylon cable stranglers, then
I'll see if I can borrow a pneumatic cable tie tool.

>Nevertheless, that was indeed an interesting you tried.

I got inspired by TV's "Myth Busters". I like to do technical urban
legend type of tests. I didn't do these photos but they show that the
common guesswork for losses in coax adapters at 2.4GHz is way too
high. All those connectors only contributed 2.1dB of loss at 2.4GHz
or about 0.09dB per connector pair.
| http://802.11junk.com/jeffl/antennas/connector-loss/
| http://groups.google.com/group/alt.i...0cd3fadf7be8fb

I have some others but I don't wanna start yet another arguement.

--
Jeff Liebermann jeffl@comix.santa-cruz.ca.us
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558

In comp.dcom.cabling decaturtxcowboy <nope_none_@nowayspam.com> wrote in part:
> The network card LAN lights lite up, and no shorts and
> good continuity in all the pairs. It was a 150 ft run. I
> suppose one could try to duplicate it with some very very
> tight skinny nylon wire ties and see what happens.

No insult, but are you sure you didn't split pairs?
That usually gives lights & continuity, but no signal.

Other than that, I've heard _uniform_ stapling can create
a "notch filter".

-- Robert

Robert Redelmeier wrote:
> In comp.dcom.cabling decaturtxcowboy <nope_none_@nowayspam.com> wrote in part:
>> The network card LAN lights lite up, and no shorts and
>> good continuity in all the pairs. It was a 150 ft run. I
>> suppose one could try to duplicate it with some very very
>> tight skinny nylon wire ties and see what happens.
>
> No insult, but are you sure you didn't split pairs?
> That usually gives lights & continuity, but no signal.


Heavens no..no insult taken, but always good to offer another
suggestion. Anyway, pairs were good.

Robert Redelmeier wrote:
> In comp.dcom.cabling decaturtxcowboy <nope_none_@nowayspam.com> wrote in part:
>> The network card LAN lights lite up, and no shorts and
>> good continuity in all the pairs. It was a 150 ft run. I
>> suppose one could try to duplicate it with some very very
>> tight skinny nylon wire ties and see what happens.
>
> No insult, but are you sure you didn't split pairs?
> That usually gives lights & continuity, but no signal.
>
> Other than that, I've heard _uniform_ stapling can create
> a "notch filter".
>
I'm reaching way back into some distant memories for this and I may be
wrong but given that 300MHz is a 1m wavelength I think you in effect
made a STP cable. You'd want to space out the staples much more than 1"
or 2" for this test.

Jeff Liebermann wrote:

(snip)

> I got inspired by TV's "Myth Busters". I like to do technical urban
> legend type of tests. I didn't do these photos but they show that the
> common guesswork for losses in coax adapters at 2.4GHz is way too
> high. All those connectors only contributed 2.1dB of loss at 2.4GHz
> or about 0.09dB per connector pair.

Some time ago I thought about testing 10baseT with a common mode
240VAC signal, but I never got around to actually doing it.
That would be pretty convincing that you don't have to worry
about nearby power cables.

-- glen