Unfortunately if you have DSL2/2+ the frequencies coincide with the 160
meter band. Even if you have straight DSL you can have problems when
you transmit on 160. Tom is right about the ferrite not being a
solution as I have wound the incoming lines on many large coils and
nothing seemed to worked. I ordered the parts for the DSL filter that is
on Tom's wonderful site but I also found on line a filter that killed my
DSL problem cold. The Westek Z100B1 inserted in the telco in coming
right at the DSL modem for me was the answer. It is available on line
by just putting the model number in your search engine. Now when a
quest op is using my stations on the highers bands during a contest
remotely from the states, my TX on 160 doesn't shut down the Remote Rig
set up like before by swamping the DSL or making it slow down on data
packets.
This is for transmitting RFI issues on 160 but it may also isolate noise
from the DSL incoming...if that is an issue apart from switching
supplies and even routers themselves.
Herb Schoenbohm, KV4FZ
On 7/29/2013 2:11 PM, Tom W8JI wrote:
That almost always is a switching power supply issue. The normal mode
of excitation is differential between the power mains and other
cables. My neighbor's system bothered me.
The BEST solution to this is a lightning protection type outlet strip
that (if it does not have them) you add capacitors to. I used a system
that had F connectors, eithernet, telco, and power.
This is thousands of times more effective than throwing beads at it
and just hoping common mode impedances are so low the beads do something.
73 Tom
I recently had an internet wireless antenna/unit installed as our DSL
was
painfully slow.
Now I notice RFI in the AM broadcast band and into the 160 meter band.
There may more
RFI issues on other bands however at this point I haven't noticed
anything.
I see that Fair-Rate makes a series of "New Low Frequency Suppression
Cable
Component
ferrites, though I am not sure what I should purchase.
It looks like that I should be looking for a "certain impedance" for a
particular frequency.
Any help would be appreciated.
73 de Brian, KG8CO
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