[clug] OT: ADSL2+ and AM radio interference

steve jenkin sjenkin at canb.auug.org.au
Sun Apr 25 22:18:33 MDT 2010

Adam Baxter wrote on 26/04/10 12:53 AM:
> Can anyone on this list confirm or deny some of the things said on this
> post:
> http://forums.whirlpool.net.au/forum-replies-archive.cfm/369495.html
> "Interference from AM radio transmitters is a known cause of noise induction
> into the copper network."
> *  I've been getting quite a bit of radio interference when listening to ABC
> on AM. Coincidentally my ADSL sync speed and reliability has been degrading
> steadily. Are these related?
> * Are noisy AC-DC adapters to blame? If so, how can I isolate which one
> without unplugging my whole house?
> * Is there a way (other than ye-olde AM receiver) to measure where/what the
> noise is?
> * Would strategically placed ferrite "lifesavers" help or is it snake-oil?
> * Is there any way to shield the modem itself? (
> http://forums.whirlpool.net.au/forum-replies.cfm?t=369495&r=5426693#r5426693
> )
> Thanks guys.

Wikipedia suggests ADSL1/2+ operates in the 26kHz-1.1/2.2Mhz range, with
138kHz being the upstream/downstream

That's right in the AM radio (medium wave) band: 520kHz-1.610MHz

Steve Jenkin, Info Tech, Systems and Design Specialist.
0412 786 915 (+61 412 786 915)
PO Box 48, Kippax ACT 2615, AUSTRALIA

sjenkin at canb.auug.org.au http://members.tip.net.au/~sjenkin

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