[UK-CONTEST] ADSL modem RFI

[John Wilson]

Chris,

Use a wireless modem and a single splitter positioned right next to 
where your phone line comes into the house - this gives you the best 
ADSL speed anyway.  Then connect the house wiring into the phone output 
of this splitter.  In this way you only use one ADSL splitter and the 
chokes in it help to isolate your modem.  Or you can eliminate the house 
wiring altogether and use a single DECT cordless phone (ones with built 
in answering machine also available if you need it) connected directly 
into the filter with the cordless extensions wherever you need them in 
the house. 

I also wind as many turns as possible of the line from the ADSL filter 
to the modem round a big ferrite ring   I did this initially as I found 
that MW broadcasting pick-up on my long overhead phone line badly 
reduced the ADSL noise margin (find this on the statistics page from the 
modem).  This should also remove the 160 and 80 m signals getting into 
the modem from the phone line.  I believe there was also a filter to do 
the same thing described in a recent Radcom but I can't remember the 
exact details of this.

73
John G3UUT

Chris Tran GM3WOJ wrote:
> Hello uk-contesters
>
> I've searched the archives unsuccessfully - I am having trouble keeping 160m 
> and 80m RF out of our ADSL (WiFi) modem - I seem to think there was a thread 
> about this on this reflector within the last 2 years ?
>
> I've tried all the usual 'fixes' - probably the only real solution is to 
> simplify our obsolete wired phone system which is behaving like an antenna 
> within the house - but I would like to re-read the suggestions made 
> previously.
>
> 73
> Chris   GM3WOJ/ZL1CT 
>
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