[TowerTalk] Wireless ISP on Ham tower

[K8RI on Tower talk]

> On Tue, 30 May 2006 15:53:10 -0500, Chuck Sudds wrote:
>
>>I have unshielded CAP-5 wire running from the
>>tower to the house, approximately 125ft away, to my router

I'm running a Gigabit Cat5e network with 4 computers a switch and router. 
The network spans about a50 feet from one iend to the other and for about 50 
feet the Cat5e runs with the coax.

>
>>I have never experienced any interference from the ISP setup to any ham
>>frequencies that I operate (HF, 6M & 2M) BUT I occasionally interfere
> with
>>the ISP dish.
>
> I have identified SEVERE RFI from the Ethernet wiring and hardware to HF
> at a site in CA. I have identified at least two culprits (and there may
> be more), and they all boil down to LOUSY suppression from cheap network
> gear.

I run from 1.8 through the 440 band and do not hear any signals from the 
network that I can identiry.
I'm using Link Sys and D-Link equipment which is not expensive stuff and has 
plastic cases.
I've never been able to make wireless work through these buildings or at an 
acceptable speed.

I do get noise but it's from a neighboring electric fence, baby monitors, 
scanners, etc...

Roger Halstead (K8RI and ARRL 40 year Life Member)
N833R - World's oldest Debonair CD-2
www.rogerhalstead.com

>
> I would be VERY surprised if you don't have birdies from the Ethernet
> cables on 14,030, 10,121, 21,052, and around 28,016. These are the ones I
> often encounter on CW, and I'm sure there are others in the phone and
> digital sub-bands and on the low end of 50 MHz. This is radiated common
> mode by the cable, and can be fairly well suppressed by ferrite chokes.
> See the tutorial on my website for details.
>
> http://audiosystemsgroup.com/publish
>
> Using shielded CAT5 will probably not help (where are you going to tie
> the shield?), but putting it in electrically continuous grounded metal
> conduit will.
>
> There is also direct radiation from unshielded network equipment. This
> stuff is broadband noise. The only solution I know of is to shield it,
> which can be a non-trivial project.  :)
>
> Jim K9YC
>
>
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