[OZAPRS] ADSL / Router / WIFI

Marcus B mrmabs at gmail.com
Fri Jan 19 11:05:57 EST 2007


One trick might be to put the router away from the equipment and run a
switch / hub to your computers, works here for me.  My D-Link
DSL-G604T feeds all kinds of noise all over 2 meters, air band and the
FM band just by being plugged into a 100mbit switch (switch is near my
gear, router is at phone plug about 5m away), if I go to 10mbit most
of the noise goes away (I think what is left might be other
equipment).

Another solution may be to switch from UTP (unshielded twisted pair)
to a shielded twisted pair cable, grounding the shield and shielding
the connectors to whatever degree you feel it necessary.  Metal boxes
are your friend.

Just a bit of forgettable trivia, 100base2 (the stuff that runs over
cat5) runs a bit clock of 125Mhz, which means (to my understanding) it
has a potential of creating most of its wideband noise from 0 -
250Mhz, with a peak around 125Mhz.

On 19/01/07, Andrew Rich <vk4tec at tech-software.net> wrote:
> Version 2.2
>
> 145.825 - full scale at 1 meter
>
> -----------------------------------------
> Andrew Rich
> Amateur radio callsign VK4TEC
> email: vk4tec at tech-software.net <mailto:vk4tec at tech-software.net>
> web: http://www.tech-software.net
> Brisbane AUSTRALIA
>
>
>
> -----Original Message-----
> From: Damien Gardner Jnr [mailto:rendrag at rendrag.net]
> Sent: Thursday, 18 January 2007 11:31 PM
> To: vk4tec at tech-software.net; VK / ZL APRS Users
> Subject: Re: [OZAPRS] ADSL / Router / WIFI
>
>
> ----- Original Message -----
> From: "Andrew Rich" <vk4tec at tech-software.net>
> > WRT54G has a known problem, when the LAN ports are set to 100MB/s.
> > Harmonics across 145 MHz and strong.
> > Linysys know about it, and their remedy is - back ports off to 10 MB/s
> > So you have to degrade the performance of their product to make it
comply
> > with standards.
>
> Out of interest, how old is your WRT?  Just trying to figure why I've
never
> had a problem with either of mine..  Granted I don't really use much but
> 145.175, so I may have just gotten lucky.. :) All the discussions I
could
> find on the 'net were from '04 and early '05 - just wondering if they
fixed
> the problem in later models... If I can figure out WTF I put the D7 when
I
> built the new server room last month, I might have a play tomorrow and
see..
> Will also test the DG834G I've got here to make sure it's not doing the
same
> :)
>
> Regards,
>
> Damien
>
>
>
>
> _______________________________________________
> Ozaprs mailing list
> Ozaprs at aprs.net.au
> http://aprs.net.au/mailman/listinfo/ozaprs
>


-- 
VK3TST
-- "People aren't stupid. Usually." -- jd
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