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How to solve digital noise getting into RF which is very common.

97.95.43.235
Posted on May 22, 2017 at 03:42:06
Michael Samra
Dealer

Posts: 36118
Location: saginaw michigan
Joined: January 30, 2005
 This is definitely a problem and I knew routers and digital transmissions were the source of it and Dave Beard just confirmed it.Outside shutting routers off,does anyone know of an effective digital filter that could be put on a radio receiver or on the router itself? There is a second short video but and the noise also comes from switches boxes as well. There has to be a filter or at least a router that wont mess with AM and SSB that is well filtered.






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"For every complex problem there is an answer that is clear, simple, and wrong" H. L. Mencken

 

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The modern question, posted on May 22, 2017 at 07:28:10
airtime
Audiophile

Posts: 11287
Location: Arizona
Joined: February 4, 2003
 The only solution I can think of is build a time machine and go back into the 70's.

Ok, sorry for the joke but here's what I did.

I used to have all my router, wifi, switching boxes, etc... basically my computer and stereos in the same room. As fate would have it I moved into a new house and could no longer use that same setup.

The computer is about 25 feet away and I use a TP-Link Wifi extender to my stereo area. The extender is about 8 feet from the stereo and cabled to my Marantz streamer. Computers and accessories are noisy even on regular stereos. Basically keep them as far away from each other as possible. Or if you need a computer near by use a solid state drive. It helps at least cut down on the noise.

You do know there have been health studies about the effects of the massive increased microwave transmissions from cell towers. Odd - it keeps getting shut down???

 

RE: The modern question, posted on May 22, 2017 at 10:59:15
Michael Samra
Dealer

Posts: 36118
Location: saginaw michigan
Joined: January 30, 2005
 It isn't so bad on FM but for Ham or Shortwave broadcasts or AM,it is horrendous.
"For every complex problem there is an answer that is clear, simple, and wrong" H. L. Mencken

 

RE: The modern question, posted on May 22, 2017 at 11:51:04
DannyR
Audiophile

Posts: 611
Joined: January 21, 2001
 I have a issue with certain dacs, switching power supplies etc messing up my reception of weaker stations on fm. Interesting enough my wifi and computers don't have any effect. Also that my Fisher 400's tuner seems immune to the negative effects.

 

RE: The modern question, posted on May 22, 2017 at 12:35:50
Michael Samra
Dealer

Posts: 36118
Location: saginaw michigan
Joined: January 30, 2005
 I don't have any issues on any of my audio systems however,an RF spectrum analyzer is the only way to really know how much noise is present.You would be surprised at just how much digital noise and RF interference can affect amplification,even tho we may not think we hear it. Shielding and grounding is most important,when it comes to repelling noise or interference.

"For every complex problem there is an answer that is clear, simple, and wrong" H. L. Mencken

 

RE: How to solve digital noise getting into RF which is very common., posted on May 22, 2017 at 12:55:37
Eli Duttman
Audiophile

Posts: 10455
Location: Monroe Township, NJ
Joined: March 31, 2000
 Mikey,

Are you talking about a "wireless" router, which (of course) is a transciever? Some ethernet equipment, especially older stuff, used/uses RG58 coax cabling. Maybe that's what you need in your "touchy" environment.

Substantial ferrites on the power cables of digital equipment, to keep the crud they generate out of the AC mains strikes me as being important. EMI/RFI filtration of the AC feeds to analog equipment, to "cleanse" incoming AC, is a complementary action.


Eli D.

 

I only have the problem on some some AM radios with no external antenna, posted on May 22, 2017 at 13:07:56
Michael Samra
Dealer

Posts: 36118
Location: saginaw michigan
Joined: January 30, 2005
 I use RG213U all thru the ham shack which is low noise milspec.
"For every complex problem there is an answer that is clear, simple, and wrong" H. L. Mencken

 

RE: The modern question, posted on May 22, 2017 at 19:22:56
airtime
Audiophile

Posts: 11287
Location: Arizona
Joined: February 4, 2003
 Try using an oscilloscope with a florescent mag lamp. Now THAT'S distortion.

 

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