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Total 28 documents matching your query.

1. [RFI] Ultrasonic Dish (score: 1): Author: rick darwicki <n6pe@yahoo.com>; Date: Tue, 1 Jan 2013 19:49:11 -0800 (PST); I'm considering building the W1TRC arc detector from April 2006 QST. Any ideas on a cheap source for the parabolic dish? Worth the effort? Thanks Rick, N6PE == Talk is cheap... except when Congr; /archives//html/RFI/2013-01/msg00000.html (5,970 bytes)
2. Re: [RFI] Ultrasonic Dish (score: 1): Author: "KD7JYK DM09" <kd7jyk@earthlink.net>; Date: Tue, 1 Jan 2013 20:21:42 -0800; "Any ideas on a cheap source for the parabolic dish? Worth the effort?" I've also been considering one of those ultrasonic listeneres to add to my equipment, perhaps with a video camera and crosshair; /archives//html/RFI/2013-01/msg00001.html (6,599 bytes)
3. Re: [RFI] Ultrasonic Dish (score: 1): Author: John Brosnahan -- W0UN <shr@swtexas.net>; Date: Tue, 01 Jan 2013 23:10:53 -0600; Not cheap but Edmond has some aluminum ones. http://www.scientificsonline.com/large-parabolic-reflectors.html _______________________________________________ RFI mailing list RFI@contesting.com http:; /archives//html/RFI/2013-01/msg00002.html (7,206 bytes)
4. Re: [RFI] Ultrasonic Dish (score: 1): Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>; Date: Wed, 02 Jan 2013 05:29:18 -0500; Virtually anything that is roughly the desired shape will word, be it plastic or metal: Cook ware, kids snow saucers, etc. Just go into Lowe's, Home Depot, Sears, Koh'ls, or hard ware stores and look; /archives//html/RFI/2013-01/msg00003.html (7,785 bytes)
5. Re: [RFI] Ultrasonic Dish (score: 1): Author: dalej <dj2001x@comcast.net>; Date: Wed, 2 Jan 2013 05:04:51 -0600; Or build your own. Home Depot and buy some roofing flashing, or sheet copper from a salvage yard would be nice, I have some here that I use for ground straps. Cut out a circle then take a pie slice a; /archives//html/RFI/2013-01/msg00004.html (8,832 bytes)
6. Re: [RFI] Ultrasonic Dish (score: 1): Author: Don Nelson <n0ye@comcast.net>; Date: Wed, 02 Jan 2013 05:35:47 -0700; Hi all, A parabolic dish to be used for ultrasonic purposes uses the same physics as a parabolic dish used in a flash light or in microwave applications. I dabble in the microwave arena. The engineer; /archives//html/RFI/2013-01/msg00005.html (8,899 bytes)
7. Re: [RFI] Ultrasonic Dish (score: 1): Author: John Brosnahan -- W0UN <shr@swtexas.net>; Date: Wed, 02 Jan 2013 06:37:56 -0600; Virtually anything that is roughly the desired shape will word, be it plastic or metal: Cook ware, kids snow saucers, etc. Just go into Lowe's, Home Depot, Sears, Koh'ls, or hard ware stores and look; /archives//html/RFI/2013-01/msg00006.html (8,211 bytes)
8. Re: [RFI] Ultrasonic Dish (score: 1): Author: N1BUG <paul@n1bug.com>; Date: Wed, 02 Jan 2013 07:59:44 -0500; I have been working on the "dish problem". It is not as simple as it may seem, if one is looking for optimum performance. Aren't we all? ;-) It is very important to match the shape (depth) of the dis; /archives//html/RFI/2013-01/msg00007.html (12,481 bytes)
9. Re: [RFI] Ultrasonic Dish (score: 1): Author: Bob K6UJ <k6uj@pacbell.net>; Date: Wed, 2 Jan 2013 07:11:49 -0800; How about an aluminum wok ? Or maybe they dont make them out of aluminum.................. _______________________________________________ RFI mailing list RFI@contesting.com http://lists.contesting.; /archives//html/RFI/2013-01/msg00009.html (10,592 bytes)
10. Re: [RFI] Ultrasonic Dish (score: 1): Author: dalej <dj2001x@comcast.net>; Date: Wed, 2 Jan 2013 09:40:24 -0600; Take your ruler along to a store where they sell bird feeders. You will find squirrel baffles, they are a parabola shape and come in clear plastic and not clear, they have a hole in the middle. I hav; /archives//html/RFI/2013-01/msg00010.html (13,324 bytes)
11. [RFI] Ultrasonic Dish (score: 1): Author: "Lee K7TJR" <k7tjr@msn.com>; Date: Wed, 2 Jan 2013 09:32:35 -0800; plastic or metal: Cook ware, kids snow saucers, etc. Just go into Lowe's, Home Depot, Sears, Koh'ls, or hard ware stores and look around. I have to take issue with this statement as I spent several; /archives//html/RFI/2013-01/msg00012.html (8,267 bytes)
12. [RFI] Ultrasonic Dish (score: 1): Author: "Lee K7TJR" <k7tjr@msn.com>; Date: Wed, 2 Jan 2013 09:54:05 -0800; the Midnight Science RX2 and was not happy. The new RX3 is much more sensitive. I have no idea how it compares with the expensive commercial units. I bought all the parts to build the W1TRC receiver; /archives//html/RFI/2013-01/msg00013.html (8,623 bytes)
13. Re: [RFI] Ultrasonic Dish (score: 1): Author: N1BUG <paul@n1bug.com>; Date: Wed, 02 Jan 2013 12:57:04 -0500; I have to take issue with this statement as I spent several weeks a couple of years ago building an ultrasonic detector. I too thought that a snow dish would work, however when compared to a real par; /archives//html/RFI/2013-01/msg00014.html (9,899 bytes)
14. Re: [RFI] Ultrasonic Dish (score: 1): Author: N1BUG <paul@n1bug.com>; Date: Wed, 02 Jan 2013 13:18:09 -0500; On 01/02/2013 12:54 PM, Lee K7TJR wrote: I have had the chance to compare my snow sled dish versus the ARRL dish versus the Radar Engineers dish. There is NO comparison. I was able to get right down; /archives//html/RFI/2013-01/msg00015.html (9,635 bytes)
15. Re: [RFI] Ultrasonic Dish (score: 1): Author: dalej <dj2001x@comcast.net>; Date: Wed, 2 Jan 2013 13:00:10 -0600; The two squirrel baffles I have are: Perky Pet brand dimensions are 16" diameter 3" deep and the hole is 2 3/4" clear plastic The other one is a North Stars industry brand and it is 15 1/2" diameter; /archives//html/RFI/2013-01/msg00016.html (15,175 bytes)
16. Re: [RFI] Ultrasonic Dish (score: 1): Author: Cortland Richmond <ka5s@earthlink.net>; Date: Wed, 02 Jan 2013 16:32:33 -0500; If you can get a good image of 50 or 80 foot distant store lighting projected off the interior curve onto a nearby flat surface, you might have a good one. I'll see tonight if I can find one to try.; /archives//html/RFI/2013-01/msg00018.html (9,843 bytes)
17. Re: [RFI] Ultrasonic Dish (score: 1): Author: Hisashi T Fujinaka <htodd@twofifty.com>; Date: Wed, 2 Jan 2013 13:41:13 -0800 (PST); Obviously receiver sensitivity is another important factor. I bought the Midnight Science RX2 and was not happy. The new RX3 is much more sensitive. I have no idea how it compares with the expensive; /archives//html/RFI/2013-01/msg00019.html (9,782 bytes)
18. Re: [RFI] Ultrasonic Dish (score: 1): Author: Jimk8mr@aol.com; Date: Wed, 2 Jan 2013 17:00:50 -0500 (EST); In most cases I've experienced, no, you will not be able to see arcing. The cases where you can see arcing, you often can also hear it with your ears if things are otherwise acoustically quiet in the; /archives//html/RFI/2013-01/msg00020.html (9,253 bytes)
19. [RFI] Ultrasonic Dish (score: 1): Author: "Lee K7TJR" <k7tjr@msn.com>; Date: Wed, 2 Jan 2013 14:07:57 -0800; In my experience, once you get into an area where the interference is, the best tool is to use an A.M. receiver on a frequency between 300 and 800 MHz. The receiver should have a decent signal stren; /archives//html/RFI/2013-01/msg00021.html (8,272 bytes)
20. Re: [RFI] Ultrasonic Dish (score: 1): Author: "KD7JYK DM09" <kd7jyk@earthlink.net>; Date: Wed, 2 Jan 2013 13:47:03 -0800; Looking for something CLEAR. It's hard to see which bolt is arcing at 150' when one is behind a 36" solid dish. Kurt _______________________________________________ RFI mailing list RFI@contesting.c; /archives//html/RFI/2013-01/msg00022.html (9,270 bytes)

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