I have an RFI location flow chart at:
https://www.nk7z.net/i-have-rfi-now-what-locating-it/
73, and thanks,
Dave (NK7Z)
https://www.nk7z.net
ARRL Volunteer Examiner
ARRL Technical Specialist, RFI
ARRL Asst. Director, NW Division, Technical Resources
On 11/25/21 20:07, Bob McGraw wrote:
I strongly agree with Jim, K9YC on this.
One way and place to start, power the transceiver from a battery such
as a lawn tractor battery. Then dump the main breaker to the house.
Make sure any UPS is also OFF. Then turn off all of the individual
breakers. Check and note the level on the receiver with one antenna and
normal settings on the receiver. Don't change antennas or receiver
settings. Just note the noise level. Turn the main breaker ON. Go
note the noise level. There should not be any change. Now, one
breaker at at time, turn it on and note the noise level for each one.
The next breaker on and note the noise level. And continue the
process. Now, if you see or observe a noise increase with a particular
breaker on, that says something on that circuit is causing noise. Find
out what it is and take corrective action. It maybe necessary to
replace something or to add a line filter at or to the offending item.
Once you have completed the process with each breaker, and cleaned up
your house, anything left is most likely outside of the house. That
would be the neighbor's house or power company. Good luck with those,
although most cases, the power company will be available to clean up
their system.......but you have to be willing to find the general
location of the source of the noise first, be it on a pole, transformer,
night light, and etc. As to the neighbors house......just buy some of
their weed and be happy. {Grow lights?}
It is a time consuming process but well worth the time. Seems we add
things and the noise comes up a wee bit, then we add something else and
the noise comes up a wee bit more, and etc. I just added some of
those twinkling blinking Christmas lights. My noise went up
noticeably. Guess I'll tolerate the noise until about Jan 2 or 3. You'd
be surprised at the number of things that cause noise that I've thrown
in the trash. Best place for most of the junk.
73
Bob, K4TAX
On 11/25/2021 8:55 PM, elecraft-requ...@mailman.qth.net wrote:
Message: 16
Date: Wed, 24 Nov 2021 11:02:06 -0800
From: Jim Brown<j...@audiosystemsgroup.com>
To:elecraft@mailman.qth.net
Subject: Re: [Elecraft] [K2] Cheap power supply for KBT2
Message-ID:
<89d0d3d2-6e46-4327-c5c3-555460f25...@audiosystemsgroup.com>
Content-Type: text/plain; charset=UTF-8; format=flowed
On 11/24/2021 6:29 AM, Chris wrote:
I use this, and it seems to be working very well.
Have you checked it for noise, using techniques in this app note?
http://k9yc.com/KillingReceiveNoise.pdf
Most hams have so much receive noise that they can't hear. If you
haven't gone through your home to get rid of your own noise sources,
chances are you're one of them.
73, Jim K9YC
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