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Total 9 documents matching your query.

1. Topband: lift station noise (score: 1): Author: "Larry Pasman" <lrpmbt@comcast.net>; Date: Tue, 7 Apr 2009 15:24:57 -0400; I am having a problem with a noisy sewage lift station near my QTH. When trying to work 160 DX early mornings I will hear a "pop" then nothing but hash until the lift station shuts off with another "; /archives//html/Topband/2009-04/msg00012.html (6,638 bytes)
2. Re: Topband: lift station noise (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Tue, 07 Apr 2009 16:06:06 -0700; Not an easy solution, Larry. On YOUR end, you might be able to kill it by putting it in the null of a directional RX antenna, but that won't help for DX coming from the same direction. :) The root ca; /archives//html/Topband/2009-04/msg00014.html (8,544 bytes)
3. Topband: lift station noise (score: 1): Author: "Lee K7TJR" <k7tjr@msn.com>; Date: Tue, 7 Apr 2009 19:59:30 -0700; Larry, for what its worth I have been through chasing noise from a pump as well. Many of the newer systems use what is called a VFD, variable frequency drive. Apparently there is some operating cost; /archives//html/Topband/2009-04/msg00015.html (7,419 bytes)
4. Re: Topband: lift station noise (score: 1): Author: Steve London <n2icarrl@gmail.com>; Date: Wed, 08 Apr 2009 13:40:31 -0600; Could someone post a .wav file of what this sounds like ? I have a large copper mine two miles away, which is essentially played-out. To extract the remaining copper, they are now pumping large quant; /archives//html/Topband/2009-04/msg00016.html (8,164 bytes)
5. Re: Topband: lift station noise (score: 1): Author: "Charles W. Shaw" <chasshaw@leaco.net>; Date: Wed, 08 Apr 2009 13:57:11 +0000; Larry, Detailed info on this particular type problem is available here: http://www.arrl.org/tis/info/HTML/power_line_handbook/ It's a large .pdf publication but worth waiting for the download and wor; /archives//html/Topband/2009-04/msg00017.html (7,844 bytes)
6. Re: Topband: lift station noise (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Wed, 08 Apr 2009 08:45:54 -0700; That is the generic name for the motor control system that I described in my previous post. So the advice you have received from Lee and me is the same. 73, Jim K9YC _________________________________; /archives//html/Topband/2009-04/msg00018.html (7,903 bytes)
7. Topband: lift station noise (score: 1): Author: "Lee K7TJR" <k7tjr@msn.com>; Date: Wed, 8 Apr 2009 09:12:38 -0700; Googling VFD will bring up a wealth of information related to this topic. such as: http://www.powerqualityanddrives.com/emi_rfi/ This is how we solved the Allen Bradley VFD problem here. You can surf; /archives//html/Topband/2009-04/msg00019.html (7,287 bytes)
8. Re: Topband: lift station noise (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Wed, 08 Apr 2009 17:59:04 -0700; I don't know, but my guess would be yes. If you are on good terms with your neighbor, you may get some relief with a good line filter. Corcom and Delta are good brands. They are not expensive, and sh; /archives//html/Topband/2009-04/msg00020.html (8,416 bytes)
9. Re: Topband: lift station noise (score: 1): Author: GEORGE WALLNER <gwallner@the-beach.net>; Date: Wed, 08 Apr 2009 22:29:36 -0400; If the motor is supplied via a variable frequency drive (VFD) it will require some special filtering! These drives input single phase (but sometimes three phase) 230 V 60 Hz AC and output a vartiable; /archives//html/Topband/2009-04/msg00021.html (9,795 bytes)

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