[TowerTalk] LMR-400 LMR-600 Equivalent (and stuff)

[Marlon K. Schafer]

Here are the frequencies used.
http://discountcablesusa.com/ethernetcables.html

As for the speeds etc.  I've heard that a few times before.  Tell you what, 
work out a speed test in whatever way you'd like to.  Run your test.  Now 
tie the cable in a tight knot.

I tried that, no change in speed.

As for the disruption of the twist rates, ever look at what a connector 
does?  grin

I'm sure that some results could be seen in the lab.  In the real world, 
with MILES of cat5 installed in just the last few years I've seen a lot of 
things effect speeds on my customers systems.  Cat5 kinks haven't been one 
of them.

marlon

----- Original Message ----- 
From: "Jim Brown" <jim at audiosystemsgroup.com>
To: "Marlon K. Schafer (509) 982-2181" <ooe at odessaoffice.com>; "Roger 
(K8RI)" <K8RI-on-TowerTalk at tm.net>
Cc: <towertalk at contesting.com>; <wireless at wispa.org>; "Nusrat Jamal" 
<njamal at ShireenInc.com>
Sent: Tuesday, June 03, 2008 9:42 AM
Subject: Re: [TowerTalk] LMR-400 LMR-600 Equivalent (and stuff)


> On Tue, 3 Jun 2008 09:21:36 -0700, Marlon K. Schafer \(509\) 982-2181
> wrote:
>
>>"kinking" cat 5 doesn't hurt anything unless you mess up the insulation in
>>the process.
>
> WRONG!  Ethernet traffic is broadband data, with components well into the
> tens of MHz. CAT5 cable is four parallel transmission lines with twist
> ratios that are offset from each other to minimize crosstalk from one pair
> to another. Kinking puts discontinuities in the cable, which can degrade
> the data waveform. It can also degrade noise immunity and crosstalk, and
> increase leakage from the cable (to your radio). You may not notice the
> data degradation, because Ethernet includes error correction and re-sends
> when data is corrupted. The effect is slower data exchange.
>
> 73,
>
> Jim Brown K9YC
>
>
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