ARLA/CLUSTER: Sistemas VDSL são investigados pela RSGB

[João Costa > CT1FBF]

VDSL Emission Investigation

A post on the RSGB Forum announces the EMC Committee is carrying out an
investigation of the significance of interference to amateur radio from
leakage from VDSL systems

In the Investigations New Technology section of the EMC Matters forum *Robin
G3JWI* says the emissions from VDSL are continuous and indistinguishable
from white noise and may go unnoticed.

VDSL2 covers frequencies up 17.66 MHz. The downstream and upstream bands
alternate and the easiest way to detect VDSL is to look for the change in
noise level at the band transitions. These are nominally 0.138 MHz, 3.75
MHz, 5.2 MHz, 8.5 MHz, 12 MHz, and 17.66 MHz. The band that predominates
depends on distance of the house from the street cabinet. Most problems are
seen when the connection to houses in the area is by overhead cables.

For the full post see
http://www.thersgb.org/forums/index.php?forums/investigations-new-technology/

RSGB Forums
http://www.thersgb.org/forums/
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