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1. [RFI] Power Lines (score: 1)
Author: "Lee K7TJR" <k7tjr@msn.com>
Date: Sat, 22 Dec 2007 19:06:51 -0800
I am near the path of a rather large DC transmission network called the Pacific DC Intertie. There is some awesome technology involved in this HVDC. A rather large Building about 100 miles North of m
/archives//html/RFI/2007-12/msg00045.html (6,939 bytes)

2. [RFI] Rfi from a neighbor. (score: 1)
Author: "Lee K7TJR" <k7tjr@msn.com>
Date: Fri, 8 Feb 2008 07:36:22 -0800
Having sold electric fences for a living, I can tell you that the recorded ticking on the ARRL site is not from an underground dog fence. The underground dog fence wires use a continuous RF transmitt
/archives//html/RFI/2008-02/msg00010.html (7,385 bytes)

3. [RFI] RFI Frustration (score: 1)
Author: "Lee K7TJR" <k7tjr@msn.com>
Date: Sat, 16 Feb 2008 19:26:15 -0800
I just went through a similar problem here. A neighbor 1/2 mile away let me come in their house with a small BCB radio. We ended up having to flip all the breakers only because I did not ask ALL the
/archives//html/RFI/2008-02/msg00044.html (8,440 bytes)

4. [RFI] Rfi with Wind Generators (score: 1)
Author: "Lee K7TJR" <k7tjr@msn.com>
Date: Fri, 22 Feb 2008 20:48:09 -0800
Hi Rich: I suggest that you look up Bob W7GG and ask him about wind generators. He had several at his location a few miles from here. His contest station was completely off the grid using solar, wind
/archives//html/RFI/2008-02/msg00048.html (6,394 bytes)

5. [RFI] Help with noise (score: 1)
Author: "Lee K7TJR" <k7tjr@msn.com>
Date: Fri, 29 Feb 2008 16:53:18 -0800
It might be worth finding your doorbell transformer. They are usually hidden in a closet but wired directly. They have been known to produce RFI. You might just try pushing the doorbell button and se
/archives//html/RFI/2008-03/msg00000.html (5,901 bytes)

6. [RFI] Powerful RFI (score: 1)
Author: "Lee K7TJR" <k7tjr@msn.com>
Date: Fri, 10 Oct 2008 09:06:13 -0700
Gary, your recordings sound exactly like the street lights here sound when their bulbs go bad. They cycle on and off from lit to dark at intervals that vary with the environment. I would look for eit
/archives//html/RFI/2008-10/msg00037.html (6,575 bytes)

7. [RFI] Powerline Bandwidth Characteristics (score: 1)
Author: "Lee K7TJR" <k7tjr@msn.com>
Date: Sat, 11 Oct 2008 09:00:43 -0700
Greg, one only needs to drive down the street while listening to a low frequency power line noise to find the answer to your question on bandwidth. The power lines are the unmatched antennas for radi
/archives//html/RFI/2008-10/msg00041.html (9,588 bytes)

8. [RFI] Powerful RFI - Solved (score: 1)
Author: "Lee K7TJR" <k7tjr@msn.com>
Date: Mon, 13 Oct 2008 23:27:17 -0700
Gary; Great to hear you found the offending street light. My town of a large 1360 population still uses overhead power lines and offending lights are easily heard on the A.M. band. I wonder if perhap
/archives//html/RFI/2008-10/msg00051.html (6,619 bytes)

9. [RFI] DX Engineering Choke question... (score: 1)
Author: "Lee K7TJR" <k7tjr@msn.com>
Date: Tue, 14 Apr 2009 13:44:38 -0700
Ron, If you look more carefully at the picture in the QST review you will see the left hand UHF connector is isolated by what appears to be some kind of plastic or other insulating material. The mate
/archives//html/RFI/2009-04/msg00037.html (7,095 bytes)

10. [RFI] Coaxial Choke (score: 1)
Author: "Lee K7TJR" <k7tjr@msn.com>
Date: Thu, 16 Apr 2009 08:45:26 -0700
I think the RF engineers have been mischaracterized just a bit. Take for instance Messrs Packard, Hewlett, Vollum, and nameless others. You cannot miss calling these likes RF engineers. Think about o
/archives//html/RFI/2009-04/msg00057.html (8,362 bytes)

11. [RFI] Update on the Boston area RFI (score: 1)
Author: "Lee K7TJR" <k7tjr@msn.com>
Date: Sat, 13 Feb 2010 14:24:04 -0800
One of the tricks my power company interference guy uses is to rotate the UHF yagi from horizontal with the hi-wires to vertical and sweep the area. His comment to me was that about 90% of the noise
/archives//html/RFI/2010-02/msg00073.html (7,829 bytes)

12. [RFI] Snow and Power Lines (score: 1)
Author: "Lee K7TJR" <k7tjr@msn.com>
Date: Tue, 16 Feb 2010 16:13:44 -0800
likely cause of interference around rain/snow is moisture bridging gaps between cracks or other flaws in insulators. Until its found you won't know though. David Robbins K1TTT> I have a noise situat
/archives//html/RFI/2010-02/msg00084.html (7,175 bytes)

13. [RFI] Frustrating White Noise (score: 1)
Author: "Lee K7TJR" <k7tjr@msn.com>
Date: Fri, 19 Feb 2010 10:04:29 -0800
Joe, Be sure and listen to the noise using the A.M. mode. Sometimes you cannot hear the line noise buzz just using ssb or cw. Lee K7TJR OR _______________________________________________ RFI mailing
/archives//html/RFI/2010-02/msg00104.html (6,838 bytes)

14. [RFI] 30m noise problem (score: 1)
Author: "Lee K7TJR" <k7tjr@msn.com>
Date: Wed, 21 Apr 2010 20:04:32 -0700
to 10mhz, but it's difficult to hear the fine structure of the modulation with only the am detector that is available; that is, everything just sounds like line noise. In essence, I'm not sure if I'
/archives//html/RFI/2010-04/msg00048.html (7,255 bytes)

15. [RFI] Wideband Noise (score: 1)
Author: "Lee K7TJR" <k7tjr@msn.com>
Date: Sun, 24 Oct 2010 20:34:30 -0700
Hi Ed, A couple of things you need to find out. One is noise as viewed on a spectrum analyzer may not see narrow 60 Hz sidebands depending on filter settings and even a Ham band receiver on narrow SS
/archives//html/RFI/2010-10/msg00084.html (7,096 bytes)

16. [RFI] distance to rfi source? (score: 1)
Author: "Lee K7TJR" <k7tjr@msn.com>
Date: Wed, 5 Jan 2011 23:21:45 -0800
I dont necessarily agree with the 80 and 160 meter comment. 160 meters can carry for miles on wires. With your numbers I would guess just outside 1/2 mile from my experience. The higher the freq you
/archives//html/RFI/2011-01/msg00067.html (6,899 bytes)

17. [RFI] RFI from HIGH voltage power lines (score: 1)
Author: "Lee K7TJR" <k7tjr@msn.com>
Date: Fri, 1 Jun 2012 08:24:29 -0700
In a previous QTH of mine there was a 130 KV line within 1/4 mile of my shack. There was also a 500KV line within about 1 -1/2 miles. There was never any interference EXCEPT in foggy, snowy or certai
/archives//html/RFI/2012-06/msg00006.html (7,919 bytes)

18. [RFI] Introduction - power line noise (score: 1)
Author: "Lee K7TJR" <k7tjr@msn.com>
Date: Sun, 24 Jun 2012 19:24:46 -0700
Paul, I feel your pain. I have power lines close from 4 power generating dams within 20 miles of my house. There are many powerlines from 110V to 500KV. I concur that you need to go higher in frequen
/archives//html/RFI/2012-06/msg00039.html (8,939 bytes)

19. [RFI] In house RFI, but (score: 1)
Author: "Lee K7TJR" <k7tjr@msn.com>
Date: Sun, 24 Jun 2012 19:45:37 -0700
Charlie, check for a doorbell transformer in a closet. It just might be on your circuit 18. Lee K7TJR OR _______________________________________________ RFI mailing list RFI@contesting.com http://lis
/archives//html/RFI/2012-06/msg00041.html (6,321 bytes)

20. [RFI] just what everyone needs! (score: 1)
Author: "Lee K7TJR" <k7tjr@msn.com>
Date: Mon, 10 Sep 2012 12:28:06 -0700
Sounds to me like this wire would not have a Radar reflection inside a fiberglass wing of an aircraft. Hmmm Stealth wire. Also sounds like a good wire to run relays and such inside or near a precisio
/archives//html/RFI/2012-09/msg00035.html (8,289 bytes)

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