[RFI] Old RFI back and a new one help please

[Battles,Richard]

Rick,

yes the power being underground does help alot with conducted rfi from switching power supplies, and this seems to help more if you do not share the same transformer secondary with a neighbor.  if you share the secondary with a neighbor who does have a noisy switching power supply, or any thing else electronic that will be conducted back into the secondary system, it will be conducted into your home wiring, it has happen to me.

also, if a neighbor that is not sharing the same secondary, but is next door, you could hear the rfi just from being radiated from their house wiring or any wiring originating from their home. the idea of cutting the power to your house is where i would start. cut each 15 or 20 amp breaker to see if the rfi will cease, if not cut all breakers, and look for a home type UPS system, they cause all kinds of rfi.  Cell phone chargers, battery chargers, tv sets, vcrs, dvd players, any thing electronic these days, which most of the time is made in china who has no regards to engineering best practice to rfi.

richard
wb4byq

________________________________________
From: rfi-bounces at contesting.com [rfi-bounces at contesting.com] On Behalf Of donovanf at starpower.net [donovanf at starpower.net]
Sent: Wednesday, January 26, 2011 11:37 AM
To: rfi at contesting.com
Subject: Re: [RFI] Old RFI back and a new one help please

Rick,

Before you invest time searching for the RFI outside your home, you should be certain that its not originating from inside your own home.  You don't have to introduce a new device for RFI to originate from your home, RFI can be caused by many chenges that can heppen to your existing devices and infrastructure.

Shut off all of the breakers except the breaker feeding your radio, and don't forget to turn off all UPSs too.  If the RFI is still there, then you know you're ready to look outside your home.

73
Frank
W3LPL



---- Original message ----
>Date: Wed, 26 Jan 2011 09:05:59 -0800 (PST)
>From: Rick Scott <w7psk at yahoo.com>
>Subject: Re: [RFI] Old RFI back and a new one help please
>To: "Battles,Richard" <Battles.Richard at lee.k12.al.us>, "rfi at contesting.com" <rfi at contesting.com>
>
>Well I have not added a power supply here.
>
>All our lines are underground until the top of the hill.  Would that make a
>difference>
>
>
>
>
>----- Original Message ----
>> From: "Battles,Richard" <Battles.Richard at lee.k12.al.us>
>> To: "rfi at contesting.com" <rfi at contesting.com>
>> Sent: Wed, January 26, 2011 8:34:01 AM
>> Subject: Re: [RFI] Old RFI back and a new one help please
>>
>> Scott, this sounds like a switching power supply in you home, or near you from
>>a  neighbor.  switching power supplies sound like a buzzsaw.  the rfi  from the
>> supply will be conducted into the house wiring, then into the power  lines from
>>the power company.  the rfi will not go past the transformer, on  the pole, but
>>will flow
>> into the ground system of the power system.
>>
>> a  common mode choke will most likely fix the  problem.
>>
>> richard
>> wb4byq
>>
>> ________________________________________
>> From: rfi-bounces at contesting.com [rfi-bounces at contesting.com] On  Behalf Of
>>Rick Scott [w7psk at yahoo.com]
>> Sent: Wednesday, January  26, 2011 10:00 AM
>> To: rfi at contesting.com
>> Subject: [RFI] Old  RFI back and a new one help please
>>
>> The noise I talked about a while ago  is back.  It was a blissful 2 weeks
>>without
>> it.
>> But last night It  showed up again.  This bites.  Ive got the ARRL sending me
>>a
>> helpful
>> gent soon.  He isn't available right now due to family  issues but I'm sure he
>> can help.
>>
>> Ive got a new one that showed up too  that's really strong.  Hopefully some
>>have
>> heard it.
>>
>>
>> Its a  buzzsaw sound that lasts for 1 second and cycles every 6 seconds.   So
>> every 6 seconds
>> I get 1 second of extremely strong  buzzsaw.
>>
>>
>>
>>
>> Whee I love city living.
>>
>> Scotty  W7PSK
>>
>>
>>
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>
>
>
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