/I didn't spend the time to research medical but in Colorado those grow operations NEVER happen in residential areas. // / In Boulder, CO I have tracked down 5 growers in a residential neighborhood.
Ken, You do not need a shielded loop. You can build a loop in a few hours. See: http://tomthompson.com/radio/RecievingLoop/loop.html I can track down an RFI source verry easily. The RFI is vertically
Hi Ken, One thing to keep in mind when you choose a loop is the antenna factor. I believe your RFI is mainly on 80m. A small (10") loop that is not tuned will have a terrible antenna factor on 80 m.
Several of you have shown interest in the loop antenna. I have updated my web page to show more details. If you have it cached, you may have to refresh it. The URL is: http://tomthompson.com/radio/Re
Don, Your approach is right on. When I knock on the door I essentially tell the person the following and leave a written notice if they are uncooperative: Official Notice of Interference Hi, I have t
Ken, The balun is just several turns of the coax through the #43 ferrite core material. Tom Several of you have shown interest in the loop antenna. I have updated my web page to show more details. If
Sorry, Dave. I just made the prototype shown. Tom THank you for sharing that build! Do you by chance have any PC boards for the RX? _______________________________________________ RFI mailing list RF
Hi Dale, I had one case where the people denied any culpability, so I looked up the address in the tax records and found out the property was a rental. I contacted the landlord who contacted the rent
Hi Dave, I used #43 because I had it on hand and it gave a little more choking impedance on 40m than #31 material. The feedline is so short compared to a wavelength that it probably makes little diff
Ken, I wouldn't worry too much about the balun. I think you will find the DFing very easy with a little practice. I am glad Larry was able to help you. He is a very sharp engineer and has done a lot
Yo are welcome, Dave. I am glad to share. As you can see, unfortunately, I have spent a lot of time on RFI mitigation:-( Tom Thank you for sharing your process. It helps... I am working with an older
Charlie, What I do is null the signal with the loop. Since the RFI signals all seem to be vertically polarized, You are looking through the loop in the direction of the nulled signal. I site a distan
Hi Charlie, I bought a middle of the road compass from REI. I did not get the one with a mirror, but that might be helpful. Tom W0IVJ OK, understand. OK on that. We all have our methods and that can
Does anyone know whether the variation in sound on this recording is due to the RFI changing or the receiver being tuned? Tom W0IVJ sound of broadband plasma TV generated noise. This noise averaged 5
Thanks, Rob...really helpful!! Tom On 4/7/2014 2:22 PM, Rob Atkinson wrote: There are a few variables you need to be aware of with reception of PTV RFI. It sounds different depending on whether or no
Thanks for the update, Tom. Your kind of followup is helpful to all. Tom W0IVJ Got a call today by a lady from the FCC and asked me if I still had the RFI issue. Apparently, the RFI ceased about four
Hi Jorge, I would first confirm the reception on a different antenna and receiver. Also, see if it occurs every 10 kHz below 3500. It sounds like it might be in their equipment. I recall a similar si
Ken, If you can get a fix on your predominant noise, your best bet is to walk in that direction with your loop. If health reasons preclude this, just walk as far as you can and start from that spot t
It could be that the broadband noise is local and the STANAG signal at 4286.3 kHz is strong enough to poke through the broadband noise and they are not related at all. Tom W0IVJ Dale, k9vuj The wide
Hi Dave, I have found all of the grow light stores here in the Boulder, CO area to be extremely friendly and helpful to the extent that they let me make measurements in their store so I could develop