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1. Re: [RFI] MFJ-856 (score: 1): Author: Pete Smith <n4zr@comcast.net>; Date: Mon, 23 Apr 2012 07:38:18 -0400; OTOH, for less money, you can buy a shirt-pocket handi with 2-band transmit capability and AM receive capability on the aircraft band. I built a 136-mhz moxon (from QST} out of hardware store aluminu; /archives//html/RFI/2012-04/msg00058.html (9,348 bytes)
2. Re: [RFI] MFJ-856 (score: 1): Author: Pete Smith <n4zr@comcast.net>; Date: Mon, 23 Apr 2012 15:40:45 -0400; I thought about mentioning that at the time I wrote my last message. I included a simple variable attenuator - no need for calibrated attenuation - so that I could reduce the signal enough to get a g; /archives//html/RFI/2012-04/msg00060.html (13,298 bytes)
3. [RFI] USB qrm - what to do? (score: 1): Author: Pete Smith N4ZR <n4zr@comcast.net>; Date: Mon, 13 Mar 2017 07:31:36 -0400; My shack computer has 6 different USB devices attached. When I disconnect all but the keyboard, it cuts the background noise level on 160M by a whopping 25 dB, from S9+18 down to S8 (as monitored by; /archives//html/RFI/2017-03/msg00019.html (7,373 bytes)
4. [RFI] Update - USB RFI (score: 1): Author: Pete Smith N4ZR <n4zr@comcast.net>; Date: Wed, 15 Mar 2017 08:52:15 -0400; Plugged each of my usb devices into the computer separately, and discovered that most of the RFI is coming from the cable to my Seagate USB hard drive. It is a USB 3.0 device fed off a USB 2.0 port,; /archives//html/RFI/2017-03/msg00039.html (7,346 bytes)
5. [RFI] More on 160 M RFI - significance of hum bands (score: 1): Author: Pete Smith N4ZR <n4zr@comcast.net>; Date: Wed, 29 Mar 2017 18:29:29 -0400; I'm having more trouble than I expected localizing my power-line interference. In particular, one component of the interference varies from almost negligible to whopping big, as visualized on HDSDR,; /archives//html/RFI/2017-03/msg00094.html (8,569 bytes)
6. [RFI] Generac Load-Shedder RFI (score: 1): Author: Pete Smith N4ZR <n4zr@comcast.net>; Date: Sat, 22 Apr 2017 10:19:39 -0400; We recently installed a whole-house auto-start Generac generator at our house. Since the generator can't handle all of our 220 volt machines simultaneously, in the unlikely event they all were on whi; /archives//html/RFI/2017-04/msg00021.html (7,280 bytes)
7. [RFI] Is My Radio Possessed? (score: 1): Author: N4ZR <n4zr@comcast.net>; Date: Tue, 15 Aug 2017 10:32:24 -0400; 73, Pete N4ZR Check out the Reverse Beacon Network at <http://reversebeacon.net>, now spotting RTTY activity worldwide. For spots, please use your favorite "retail" DX cluster. Looking for an explana; /archives//html/RFI/2017-08/msg00021.html (7,548 bytes)
8. [RFI] 2 cables one toroid (score: 1): Author: N4ZR <n4zr@comcast.net>; Date: Sun, 20 Aug 2017 10:27:57 -0400; Is it permissible to wind two shielded audio cables on the same toroid? I'm running out of #31 toroids and want to fix RF pickup on the USB input of my sound card before I can get more. -- 73, Pete; /archives//html/RFI/2017-08/msg00031.html (6,528 bytes)
9. [RFI] Visualizing Line Noise (score: 1): Author: N4ZR <n4zr@comcast.net>; Date: Tue, 12 Dec 2017 22:28:06 -0500; I recently ran across a neat little program called Soundcard Scope, which displays 0-20,000 Hz either oscilloscope style or as a vertical bar chart by the amount of energy on a given frequency. It se; /archives//html/RFI/2017-12/msg00043.html (6,808 bytes)
10. Re: [RFI] Dishwasher (score: 1): Author: N4ZR <n4zr@comcast.net>; Date: Fri, 26 Jan 2018 21:43:33 -0500; Well, for what it's worth I just replaced a 10-year-old Kitchenaid, which had a failed microswitch, on a pushbutton switch board that was declared "unavailable." Tried swapping in another switch (fr; /archives//html/RFI/2018-01/msg00097.html (10,435 bytes)
11. [RFI] Flat-screen monitor noise (score: 1): Author: N4ZR <n4zr@comcast.net>; Date: Sun, 28 Jan 2018 07:32:04 -0500; I've been tracking down some intermittent, severe RFI, using a portable short-wave radio to identify possible in-house sources.. I just put the antenna of the radio next to the screen of my monitor; /archives//html/RFI/2018-01/msg00112.html (6,884 bytes)
12. Re: [RFI] Wholesale installation of free solar panels in MI? (score: 1): Author: N4ZR <n4zr@comcast.net>; Date: Sat, 24 Feb 2018 07:45:12 -0500; They are marketing something similar in this area - as I understand it, you commit to a 20-year lease, paying them every month, and what you get is reduced electric bills that may (or may not)offset; /archives//html/RFI/2018-02/msg00086.html (9,147 bytes)
13. [RFI] 8 KHz spurs across much of amateur spectrum (score: 1): Author: N4ZR <n4zr@comcast.net>; Date: Tue, 13 Mar 2018 07:42:00 -0400; This may be a fool's errand, but just in case - I have discovered relatively pure carriers every 8 KHz 2-28 MHz (not heard on 160), tapering in strength as the frequencies get higher. I assume some; /archives//html/RFI/2018-03/msg00029.html (7,344 bytes)
14. Re: [RFI] Connectors for 1/2" tinned copper braid strap? (score: 1): Author: N4ZR <n4zr@comcast.net>; Date: Mon, 19 Mar 2018 08:14:24 -0400; A question that doesn't seem to have been raised is whether this is a good material for HF grounding. I just verified my memory that W8JI questioned that, because of the multiple fine wire construct; /archives//html/RFI/2018-03/msg00047.html (9,608 bytes)
15. [RFI] HomePlug OK? (score: 1): Author: N4ZR <n4zr@comcast.net>; Date: Sat, 1 Sep 2018 16:32:23 -0400; I am having a lot of trouble with my Comcast wifi's range. The tech recommends going to a Homeplug system to connect my router to my computers. The latest version claims gigabit speeds, but I'd set; /archives//html/RFI/2018-09/msg00000.html (6,395 bytes)
16. [RFI] Bonding to a PC (score: 1): Author: N4ZR <n4zr@comcast.net>; Date: Thu, 28 Feb 2019 14:34:33 -0500; I want to try to manage RFI in my shack, among other things, by bonding all chassis together, including my shack computer, but the question has come up - where can I find chassis ground on a PC witho; /archives//html/RFI/2019-02/msg00084.html (6,802 bytes)
17. Re: [RFI] toyota Rav4 Hybrid (score: 1): Author: N4ZR <n4zr@comcast.net>; Date: Thu, 9 May 2019 16:17:11 -0400; Sounds interesting - details? 73, Pete N4ZR Check out the Reverse Beacon Network at <http://reversebeacon.net>, now spotting RTTY activity worldwide. For spots, please use your favorite "retail" DX c; /archives//html/RFI/2019-05/msg00010.html (7,990 bytes)
18. [RFI] NanoVNA was:Re: What an interesting article... (score: 1): Author: N4ZR <n4zr@comcast.net>; Date: Sat, 5 Oct 2019 20:41:51 -0400; Gosh, that NanoVNA reminds me of being in the market for a new multimeter last year- there must have been 50 available, but the majority of them clearly came out of the same factory. Check Amazon's; /archives//html/RFI/2019-10/msg00003.html (7,950 bytes)
19. [RFI] Monitor hash (score: 1): Author: N4ZR <n4zr@comcast.net>; Date: Sat, 9 Nov 2019 21:18:28 -0500; I have two Asus 27" LCD monitors, one of which I have had for a while; the other is new. Today I was getting organized for a little noise research and had my portable SW radio on the desk right in f; /archives//html/RFI/2019-11/msg00017.html (7,186 bytes)
20. Re: [RFI] Help finding a source (score: 1): Author: N4ZR <n4zr@comcast.net>; Date: Thu, 5 Dec 2019 10:58:42 -0500; FWIW, I built a 136-MHz Moxon from a QST article <QST_Mar_2001_p32-36> to use with an Icom handi-talkie which covers the AM aircraft band. The idea is that the Moxon has a deep dip in the rear which; /archives//html/RFI/2019-12/msg00027.html (24,768 bytes)

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