--0__=L5VkLDBHnEQvCKbUgoTHho1iItgxCU759nIC2F9PpCSMpxH8P9PhQAFY Content-type: text/plain; charset=us-ascii Content-Disposition: inline I've looked at this on 11 acre loops, and if you can tolerate 100' or so of variation, you can make a determination of inside -vs- outside just from the flux intensity... however metallic structures and secondary currents from transformer coupling effects can show up and wreak all kinds of havoc. If the loop gets much larger... the flux density will drop off inside the loop signicantly, and not be effective. If you attempt to crank up the current, you will run into multiple order resonances due to transmission line effects of buried wire, and SWR issues. At Company XYZ we got up to 15,000' using a resonance design, but did have a flux density taper due to standing waves (this was at 7.5khz). |--------+-----------------------> | | David VanHorn| | | | | | | | | 02/20/01 | | | 10:08 AM | | | Please | | | respond to | | | pic | | | microcontroll| | | er discussion| | | list | | | | |--------+-----------------------> >----------------------------------------------------------------------------| | | | To: PICLIST@MITVMA.MIT.EDU | | cc: (bcc: Scott Touchton/US/UNIPHASE) | | Subject: Re: [EE]:Directional transmitter | >----------------------------------------------------------------------------| > >Only if you know the orientation of the loopstick relative to the wire. >(Just turn around and face the other way and this system will think you are >now outside the wire. Flux within a solenoid is constant across the area, but outside, it falls off rapidly. I'm not sure how well this would work for a really large loop, but it works well enclosing rooms. -- Dave's Engineering Page: http://www.dvanhorn.org Where's dave? http://www.findu.com/cgi-bin/find.cgi?kc6ete-9 -- http://www.piclist.com hint: To leave the PICList mailto:piclist-unsubscribe-request@mitvma.mit.edu --0__=L5VkLDBHnEQvCKbUgoTHho1iItgxCU759nIC2F9PpCSMpxH8P9PhQAFY Content-type: application/octet-stream; name="att1.eml" Content-Disposition: attachment; filename="att1.eml" Content-transfer-encoding: base64 UmVjZWl2ZWQ6IGZyb20gbnRzajEudW5pcGhhc2UuY29tIChbMTAuMTAuNDkuMjQ4XSkgYnkgc2pu b3Rlcy51bmlwaGFzZS5jb20gKExvdHVzIFNNVFAgTVRBIHY0LjYuNyAgKDkzNC4xIDEyLTMwLTE5 OTkpKSB3aXRoIFNNVFAgaWQgODgyNTY5RjkuMDA1MzU1REQ7IFR1ZSwgMjAgRmViIDIwMDEgMDc6 MTA6MTQgLTA4MDANClJlY2VpdmVkOiBGUk9NIGNoZXJyeS5lYXNlLmxzb2Z0LmNvbSBCWSBudHNq MS51bmlwaGFzZS5jb20gOyBUdWUgRmViIDIwIDA3OjEwOjE5IDIwMDEgLTA4MDANClJlY2VpdmVk OiBmcm9tIFBFQVIuRUFTRS5MU09GVC5DT00gKDIwOS4xMTkuMC4xOSkgYnkgY2hlcnJ5LmVhc2Uu bHNvZnQuY29tIChMU01UUCBmb3IgRGlnaXRhbCBVbml4IHYxLjFiKSB3aXRoIFNNVFAgaWQgPDMu MDAyOUI4ODBAY2hlcnJ5LmVhc2UubHNvZnQuY29tPjsgVHVlLCAyMCBGZWIgMjAwMSAxMDoxMDox OCAtMDUwMA0KUmVjZWl2ZWQ6IGZyb20gTUlUVk1BLk1JVC5FRFUgYnkgTUlUVk1BLk1JVC5FRFUg KExJU1RTRVJWLVRDUC9JUCByZWxlYXNlIDEuOGQpDQogICAgICAgICAgd2l0aCBzcG9vbCBpZCAx ODM2IGZvciBQSUNMSVNUQE1JVFZNQS5NSVQuRURVOyBUdWUsIDIwIEZlYiAyMDAxDQogICAgICAg ICAgMTA6MDg6MzUgLTA1MDANClJlY2VpdmVkOiBmcm9tIE1JVFZNQSAoTkpFIG9yaWdpbiBTTVRQ QE1JVFZNQSkgYnkgTUlUVk1BLk1JVC5FRFUgKExNYWlsDQogICAgICAgICAgVjEuMmMvMS44Yykg d2l0aCBCU01UUCBpZCA1NDQ5OyBUdWUsIDIwIEZlYiAyMDAxIDEwOjA2OjU2IC0wNTAwDQpSZWNl aXZlZDogZnJvbSBtYWlsMi5yZGMxLmlsLmhvbWUuY29tIFsyNC4yLjEuNzddIGJ5IG1pdHZtYS5t aXQuZWR1IChJQk0gVk0NCiAgICAgICAgICBTTVRQIExldmVsIDMyMCkgdmlhIFRDUCB3aXRoIFNN VFAgOyBUdWUsIDIwIEZlYiAyMDAxIDEwOjA2OjU2IEVTVA0KWC1Db21tZW50OiBtaXR2bWEubWl0 LmVkdTogTWFpbCB3YXMgc2VudCBieSBtYWlsMi5yZGMxLmlsLmhvbWUuY29tDQpSZWNlaXZlZDog ZnJvbSBtYWluLmNlZGFyLm5ldCAoWzI0LjQuMTY1LjIwMF0pIGJ5IG1haWwyLnJkYzEuaWwuaG9t ZS5jb20NCiAgICAgICAgICAoSW50ZXJNYWlsIHZNLjQuMDEuMDMuMDAgMjAxLTIyOS0xMjEpIHdp dGggRVNNVFAgaWQNCiAgICAgICAgICA8MjAwMTAyMjAxNTA4MTcuUUJKSTI2NjU1Lm1haWwyLnJk YzEuaWwuaG9tZS5jb21AbWFpbi5jZWRhci5uZXQ+Ow0KICAgICAgICAgIFR1ZSwgMjAgRmViIDIw MDEgMDc6MDg6MTcgLTA4MDANClgtU2VuZGVyOiBkdmFuaG9ybkBtYWlsLmNlZGFyLm5ldA0KWC1N YWlsZXI6IFFVQUxDT01NIFdpbmRvd3MgRXVkb3JhIFZlcnNpb24gNC4zLjINClJlZmVyZW5jZXM6 IDw4ODI1NjlGOS4wMDRBODE1RC4wMEBzam5vdGVzLnVuaXBoYXNlLmNvbT4NCk1pbWUtVmVyc2lv bjogMS4wDQpDb250ZW50LVR5cGU6IHRleHQvcGxhaW47IGNoYXJzZXQ9InVzLWFzY2lpIjsgZm9y bWF0PWZsb3dlZA0KTWVzc2FnZS1JRDogIDw0LjMuMi43LjIuMjAwMTAyMjAxMDA3MTUuMDIyOTg1 ODBAbWFpbC5jZWRhci5uZXQ+DQpEYXRlOiAgICAgICAgIFR1ZSwgMjAgRmViIDIwMDEgMTA6MDg6 MjMgLTA1MDANClJlcGx5LVRvOiAgICAgcGljIG1pY3JvY29udHJvbGxlciBkaXNjdXNzaW9uIGxp c3QgPFBJQ0xJU1RATUlUVk1BLk1JVC5FRFU+DQpTZW5kZXI6ICAgICAgIHBpYyBtaWNyb2NvbnRy b2xsZXIgZGlzY3Vzc2lvbiBsaXN0IDxQSUNMSVNUQE1JVFZNQS5NSVQuRURVPg0KRnJvbTogICAg ICAgICBEYXZpZCBWYW5Ib3JuIDxkdmFuaG9ybkBDRURBUi5ORVQ+DQpTdWJqZWN0OiAgICAgIFJl OiBbRUVdOkRpcmVjdGlvbmFsIHRyYW5zbWl0dGVyDQpUbzogICAgICAgICAgIFBJQ0xJU1RATUlU Vk1BLk1JVC5FRFUNCkluLVJlcGx5LVRvOiAgPDAwMzkwMWMwOWI0MyQ4MmJiNDkwMCRmOWU4YzU0 MEBzY2llbmNla2l0LmNvbT4NCg0KPg0KPk9ubHkgaWYgeW91IGtub3cgdGhlIG9yaWVudGF0aW9u IG9mIHRoZSBsb29wc3RpY2sgcmVsYXRpdmUgdG8gdGhlIHdpcmUuDQo+KEp1c3QgdHVybiBhcm91 bmQgYW5kIGZhY2UgdGhlIG90aGVyIHdheSBhbmQgdGhpcyBzeXN0ZW0gd2lsbCB0aGluayB5b3Ug YXJlDQo+bm93IG91dHNpZGUgdGhlIHdpcmUuDQoNCkZsdXggd2l0aGluIGEgc29sZW5vaWQgaXMg Y29uc3RhbnQgYWNyb3NzIHRoZSBhcmVhLCBidXQgb3V0c2lkZSwgaXQgZmFsbHMNCm9mZiByYXBp ZGx5Lg0KDQpJJ20gbm90IHN1cmUgaG93IHdlbGwgdGhpcyB3b3VsZCB3b3JrIGZvciBhIHJlYWxs eSBsYXJnZSBsb29wLCBidXQgaXQgd29ya3MNCndlbGwgZW5jbG9zaW5nIHJvb21zLg0KDQotLQ0K RGF2ZSdzIEVuZ2luZWVyaW5nIFBhZ2U6IGh0dHA6Ly93d3cuZHZhbmhvcm4ub3JnDQpXaGVyZSdz IGRhdmU/IGh0dHA6Ly93d3cuZmluZHUuY29tL2NnaS1iaW4vZmluZC5jZ2k/a2M2ZXRlLTkNCg0K LS0NCmh0dHA6Ly93d3cucGljbGlzdC5jb20gaGludDogVG8gbGVhdmUgdGhlIFBJQ0xpc3QNCm1h aWx0bzpwaWNsaXN0LXVuc3Vic2NyaWJlLXJlcXVlc3RAbWl0dm1hLm1pdC5lZHUNCg0KDQo= --0__=L5VkLDBHnEQvCKbUgoTHho1iItgxCU759nIC2F9PpCSMpxH8P9PhQAFY-- -- http://www.piclist.com hint: To leave the PICList mailto:piclist-unsubscribe-request@mitvma.mit.edu