Re: Elecraft Digest, Vol 190, Issue 16

[Elecraft mailing list]

Yes, I do have three neighbors: two are about 550 ft away and one is 700 ft away. I have not asked them yet to pull their breakers. I thought the distance was far enough to eliminate RFI from household appliances, plasma TVs, etc. Also, the RFI is 24x7 so if it were caused by my neighbors’ plasma TVs, there shouldn’t be any RFI at, say, 3AM in the morning. There are no electric fences in our area. I do have a UPS. I eliminated that as the source also.

73, Andreas K6AKW

>
>
> ------------------------------
>
> Message: 2
> Date: Thu, 20 Feb 2020 09:42:05 -0800
> From: Jim Brown <[hidden email]>
> To: [hidden email]
> Subject: Re: [Elecraft] RFI issues
> Message-ID:
> <[hidden email]>
> Content-Type: text/plain; charset=utf-8; format=flowed
>
> On 2/18/2020 4:38 PM, Andreas Wachter via Elecraft wrote:
>> Yes, I did run the K3 off of a battery and pulled the main AC breaker. Didn?t make any difference. Thus my suspicion that the RFI is related to the 208 kW ERP TV station (and/or 63 kW EPR FM station) which are within 1.6 miles and in direct line of sight.
>
> Do you have neighbors? Did you pull their breakers at the same time?
>
> Do you have a UPS? They continue to run without power, so both they and
> any connected equipment can create noise.
>
> Did you take the time to study the link I posted?
>
> 73, Jim K9YC
>
>

______________________________________________________________
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:[hidden email]

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
Message delivered to [hidden email]

[Jim Brown-10]

On 2/21/2020 9:17 AM, Andreas Wachter via Elecraft wrote:
> Also, the RFI is 24x7 so if it were caused by my neighbors’ plasma TVs, there shouldn’t be any RFI at, say, 3AM in the morning.

Andreas,

For at least ten years, almost anything we buy that plugs into the wall
has an SMPS that generates noise as long as it's connected. This
includes everything from computers to TVs to home entertainment systems
to battery chargers to the inverters for solar systems. My closest
neighbors are at distances about like yours, and I get noise from them.
Some of it cycles on and off, some is constant. There's power line
noise, which can be constant or not.

Like the technically illiterate folks who live near me who believe that
cell towers cause cancer and who campaign against the addition of cell
sites that can provide us service, you've made up your mind without
knowledge of the underlying science.

I've sent you a link to a tutorial that provide detailed advice about
figuring out what kind of noise source(s) you have, how to track them
down, and how to kill them. I repeat my advice to study it.

http://k9yc.com/KillingReceiveNoise.pdf

73, Jim K9YC


______________________________________________________________
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:[hidden email]

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
Message delivered to [hidden email]