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161. Re: [RFI] Guidance on finding noise? (score: 1)
Author: David Eckhardt <davearea51a@gmail.com>
Date: Sun, 12 Jan 2020 18:18:49 +0000
Once on site, you might try a much smaller loop instead of a 'real' antenna. Dave - WØLEV -- *Dave - WØLEV* *Just Let Darwin Work* *Just Think* _______________________________________________ RFI mai
/archives//html/RFI/2020-01/msg00089.html (14,573 bytes)

162. Re: [RFI] Choke questions (score: 1)
Author: David Eckhardt <davearea51a@gmail.com>
Date: Tue, 21 Jan 2020 21:29:48 +0000
The early comm satellites that went up used Teflon as a substrate for the RF boards. Teflon doesn't do too well in a radiation environment. The MTTF of the first satellites was weeks due to the RF po
/archives//html/RFI/2020-01/msg00112.html (10,535 bytes)

163. Re: [RFI] Choke questions (score: 1)
Author: David Eckhardt <davearea51a@gmail.com>
Date: Tue, 21 Jan 2020 21:52:18 +0000
I've found the super-flex insulated 'antenna wire' sold by Davis RF is pretty good for winding larger ferrite cores (bifilar, quadfilar, ...). Also I've repeatedly used RG-142 Teflon coax for winding
/archives//html/RFI/2020-01/msg00114.html (11,156 bytes)

164. Re: [RFI] AM Broadcast Intermod? (score: 1)
Author: David Eckhardt <davearea51a@gmail.com>
Date: Tue, 28 Jan 2020 17:17:58 +0000
Before you contact anyone, install a BC SBF or an HPF with a corner about 1.8 MHz. These should be at least a 4-section Chebyshev design. You could also try paralleling your feedline with a shunt-con
/archives//html/RFI/2020-01/msg00156.html (9,441 bytes)

165. Re: [RFI] AM Broadcast Intermod? (score: 1)
Author: David Eckhardt <davearea51a@gmail.com>
Date: Tue, 28 Jan 2020 17:35:22 +0000
Pete, excellent suggestion. I spaced that trick which is far easier than what I suggested. Dave - WØLEV -- *Dave - WØLEV* *Just Let Darwin Work* *Just Think* _________________________________________
/archives//html/RFI/2020-01/msg00158.html (9,414 bytes)

166. Re: [RFI] RFI from solar system and inverters (score: 1)
Author: David Eckhardt <davearea51a@gmail.com>
Date: Tue, 4 Feb 2020 17:10:41 +0000
From reading all the posts on this group, Solar Edge knows how to do a clean installation. BUT,.......whether they do or not is another story. You might go through the archives on this group to get a
/archives//html/RFI/2020-02/msg00015.html (8,005 bytes)

167. Re: [RFI] SolarEdge RFI Inverter On/Off Test (score: 1)
Author: David Eckhardt <davearea51a@gmail.com>
Date: Wed, 5 Feb 2020 18:12:40 +0000
Kim: Quote: " but any system will have to not merely RF quiet, but absolutely RF *silent* from DC to as high as I can collect the equipment to measure." Put this (word smithed in 'legalize' language)
/archives//html/RFI/2020-02/msg00029.html (10,360 bytes)

168. Re: [RFI] SolarEdge RFI Inverter On/Off Test (score: 1)
Author: David Eckhardt <davearea51a@gmail.com>
Date: Wed, 5 Feb 2020 23:57:12 +0000
" solar power system is supposed to be." True, ONLY if they are called on the carpet for an RFI dirty installation. Reading on this site pretty much confirms that conclusion. One of the companies I w
/archives//html/RFI/2020-02/msg00031.html (14,289 bytes)

169. Re: [RFI] RFI (score: 1)
Author: David Eckhardt <davearea51a@gmail.com>
Date: Fri, 7 Feb 2020 19:52:30 +0000
I do not have a high efficiency multi-speed AC unit. However, in light that it may help someone else, I did have one RFI problem with ours, a Carrier (my least favorite, but that's what they installe
/archives//html/RFI/2020-02/msg00041.html (8,429 bytes)

170. Re: [RFI] Multi-Stage High Efficiency Air Conditioner Units (score: 1)
Author: David Eckhardt <davearea51a@gmail.com>
Date: Fri, 7 Feb 2020 21:18:56 +0000
In the front end of any good graduate level antenna text resides the Theorem of Reciprocity: "A good emitter is a good receiver". Yes, it works both ways. And don't forget to not pass conductors near
/archives//html/RFI/2020-02/msg00045.html (9,761 bytes)

171. Re: [RFI] FCC Limits on Harmful Interference (score: 1)
Author: David Eckhardt <davearea51a@gmail.com>
Date: Fri, 7 Feb 2020 21:51:17 +0000
Even the limits those of us who play EMC/RFI set by the FCC and the EU would, by most amateurs radio operators, be considered 'harmful'. The set limits for radiated emissions which products must pass
/archives//html/RFI/2020-02/msg00047.html (10,243 bytes)

172. Re: [RFI] FCC Limits on Harmful Interference: Clarification (score: 1)
Author: David Eckhardt <davearea51a@gmail.com>
Date: Fri, 7 Feb 2020 21:53:17 +0000
Don't ever,........, EVER tempt FCC to define "harmful interference". Amateur radio (and my 'other' hobby, radio astronomy) will pay dearly if they do!!!!! Dave - WØLEV -- *Dave - WØLEV* *Just Let Da
/archives//html/RFI/2020-02/msg00048.html (10,063 bytes)

173. Re: [RFI] Multi-Stage High Efficiency Air Conditioner Units (score: 1)
Author: David Eckhardt <davearea51a@gmail.com>
Date: Sun, 9 Feb 2020 01:58:17 +0000
One interview I ran while at HP trolling for a tech for our EMC group. I asked the candidate what he though of ferrites. I don't like specific questions on an interview. I'd rather ask general questi
/archives//html/RFI/2020-02/msg00059.html (10,871 bytes)

174. Re: [RFI] Not QUITE OT (score: 1)
Author: David Eckhardt <davearea51a@gmail.com>
Date: Fri, 21 Feb 2020 17:28:24 +0000
If you desire a 'real' answer, many labs offer an engineering only test. There are no reports other than engineering data. Usually the minimum payment is 1/2-day. Some will even offer less time for e
/archives//html/RFI/2020-02/msg00120.html (10,428 bytes)

175. [RFI] RF NOISE WIKI (score: 1)
Author: David Eckhardt <davearea51a@gmail.com>
Date: Sat, 22 Feb 2020 21:12:17 +0000
This may be of some use to those on this group. We might even have some data to list on the site: *https://www.sigidwiki.com/wiki/Template:DatabaseUNID* <https://www.sigidwiki.com/wiki/Template:Datab
/archives//html/RFI/2020-02/msg00129.html (6,509 bytes)

176. Re: [RFI] mysterious voices, music come from house's walls (score: 1)
Author: David Eckhardt <davearea51a@gmail.com>
Date: Mon, 24 Feb 2020 16:26:36 +0000
Yet another BC station supplying 'free energy'. Place: Albuquerque North Valley. Station: KKOB towers in the North Valley. "No" problem RFI: The chicken farm (coops) in the North Valley. Again, the l
/archives//html/RFI/2020-02/msg00161.html (12,143 bytes)

177. Re: [RFI] mysterious voices, music come from house's walls (score: 1)
Author: David Eckhardt <davearea51a@gmail.com>
Date: Mon, 24 Feb 2020 19:25:44 +0000
Yep. Those good 'ol carbon microphones. They even worked when plugged into the cathode keying circuit of my original Novice transmitter when I passed the General. The varying resistance of the carbon
/archives//html/RFI/2020-02/msg00169.html (10,061 bytes)

178. Re: [RFI] advice wanted: finding the source of mixing products (score: 1)
Author: David Eckhardt <davearea51a@gmail.com>
Date: Mon, 24 Feb 2020 20:00:09 +0000
Just a few thoughts, here: Any modern solid state transmitter will produce broadband noise. The broadband noise is generally worse at less than full output power. I'm guessings that's where your BB n
/archives//html/RFI/2020-02/msg00174.html (15,428 bytes)

179. Re: [RFI] advice wanted: finding the source of mixing products (score: 1)
Author: David Eckhardt <davearea51a@gmail.com>
Date: Tue, 25 Feb 2020 00:39:51 +0000
The directional coupler you have is a good start coupled to the spectrum analyzer. However, for this test, the spectrum analyzer must have a low noise floor. I have the Rigol DSA 815 and several othe
/archives//html/RFI/2020-02/msg00186.html (21,618 bytes)

180. Re: [RFI] RF & Ferrites, (score: 1)
Author: David Eckhardt <davearea51a@gmail.com>
Date: Tue, 25 Feb 2020 19:03:01 +0000
Considering multiple turns through a ferrite 'bead': Yes, more turns will yield better isolation. However, much beyond 3 or 4 turns, and one approaches a limit of effectiveness. Cram as many turns as
/archives//html/RFI/2020-02/msg00192.html (10,120 bytes)

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