Sounds good Mike - Ive managed to mitigate DSL and other internal to abode
SMSPU noise that was making its way up the coax towards the antennae before
but that's been in concrete/brick with metal framed building where I could
dump all the noise from the internal side of the property by connecting the
coax to the frame of the building. -this isnt possible here given the
typical frame build thou. - I have thoughts of getting at the frame
reinforcing but that doesn't extend very far up the house...
Another MOooose visit today trying to get at the bird feed for the
Chickadees...
Laurence
KL 1 X Wasilla
--------------------------------------------------
From: "Mike-WE0H" <[email protected]>
Sent: Thursday, November 27, 2008 3:39 PM
To: <[email protected]>
Subject: Re: LF: ADSL
I have my DSL modem connected within a couple feet of where the Telco line
comes in the house. I run a dedicated Telco line from the outside box to
the inside box then to the modem. The house Telco wiring is filtered
outside in the Telco box. That stopped all DSL noise here.
Mike
WE0H
/16
flo wrote:
Ive been playing at noise mitigation here at WE2 X PQ Wasilla Alaska and
Im pretty happy Ive got 137kHz down to a finite level where I cant really
mitigate it any further - the noise level is effectively S3 per se and
the contributed by sideband noise from Loran and other on air qrm/n.
Sideband noise from Loran is plainly audible.
500 kHz has been another matter - The meter sits at S5 or so on SSB in
2.8kHz BW - The noise is proven to be from my ADSL *ITU G.992.3* feed
from my local Telco - My feed is from an underground (UG) feed then a
twisted pair into the house (of wooden frame construction) then into a
distributed UTP star and seried connections to RJ connections around the
house including my ADSL modem.
The noise bandwidth appears around 150kHz up to 1 MHz which would appear
to be the "downlink' towards me power bandwidth.
The fix isnt pretty but its to limit the length of the ADSL feed before
it meets an ADSL filter or filters - in my case this is to site the ADSL
modem close to where it comes out of the ground then place the modem
there and then filter the RF out and only feed the audio to 4kHz round
the house. I put a wireless Linksys at the same location of the ADSL
modem - filtering the heck out of power as we go - so all office comms
are via wireless.
Ill let you know how it goes but initial indications are by effectively
shortening the ADSL "antennae" - that the my noise level has dropped to
S2 and this isnt ADSL white noise - I cant distinguish any pattern to the
noise so presume its dispersed by coding.
ps Im limited to 512 K down so this is a pretty expensive and slowish
ADSL connection for those who live in the "boonies" -
So if you have a "Whiteish noise" view of 500 kHz or MF and you have
some negative influence from ADSL.
Laurence KL1 X
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