[Elecraft] Cheap power supply for KBT2

[Dave]

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-request at mailman.qth.net wrote:
>> Message: 16
>> Date: Wed, 24 Nov 2021 11:02:06 -0800
>> From: Jim Brown<jim at audiosystemsgroup.com>
>> To:elecraft at mailman.qth.net
>> Subject: Re: [Elecraft] [K2] Cheap power supply for KBT2
>> Message-ID:
>>     <89d0d3d2-6e46-4327-c5c3-555460f2575e at 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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