--0__=85256ACA004D538A8f9e8a93df938690918c85256ACA004D538A Content-type: text/plain; charset=us-ascii Water content has a high degree of attenuation to GPS frequencies (around 1.5G). Tree leaves are notorious for blocking the signal. Received power is on the order of -110dBm depending on antenna structure (TTBOMR), so it doesn't take many layers of "stuff" to reduce the signal to a point where the receiver can no longer distinguish the signal. I have noticed that my GPS receiver does not work in my house (2 story), but works in my sister's rancher. Figured I had too many extra layers. Jim cc: Sent by: pic Subject: Re: [OT]:cell phone locating microcontrolle r discussion list 09/17/01 09:48 AM Please respond to pic microcontrolle r discussion list "You're aware that GPS receivers need a clear view of the sky, right? They don't work even in a wooden house." Hmmm - I've had (and continue to have) good results with GPS in my wooden roof/brick facade home ... Also, you might want to look into what www.snaptrack.com is able to achieve as far as results within structures, and then there is also the operational scenario where THE PHONE/GPS combo *remembers* the last known good fix GPS position fix ... Jim ----- Original Message ----- From: "David VanHorn" To: Sent: Monday, September 17, 2001 1:22 AM Subject: Re: [OT]:cell phone locating > > > >a national authority could order all cell phones should be attached with a > >GPS receivers and on a request of the central tower they sould give their > >positions immediately. The whole thing could be transparent to the user > >such way it can be even hidden. Who knows whether it has been done > >already? ;-) > >I am not paranoid. But Andy Grove has written the book with title: Only > >Paranoids survive. > > You're aware that GPS receivers need a clear view of the sky, right? > They don't work even in a wooden house. > Under a car roof is shaky. > > -- > Dave's Engineering Page: http://www.dvanhorn.org > > I would have a link to http://www.findu.com/cgi-bin/find.cgi?KC6ETE-9 here > in my signature line, but due to the inability of sysadmins at TELOCITY to > differentiate a signature line from the text of an email, I am forbidden to > have it. > > -- > http://www.piclist.com#nomail Going offline? Don't AutoReply us! > email listserv@mitvma.mit.edu with SET PICList DIGEST in the body > > -- http://www.piclist.com#nomail Going offline? Don't AutoReply us! email listserv@mitvma.mit.edu with SET PICList DIGEST in the body --0__=85256ACA004D538A8f9e8a93df938690918c85256ACA004D538A Content-type: application/octet-stream; name="$RFC822.eml" Content-Disposition: attachment; filename="$RFC822.eml" Content-transfer-encoding: base64 UmVjZWl2ZWQ6IGZyb20gc2pzbXRwMDEudW5pcGhhc2UuY29tIChbMTAuMTAuNDkuMjM5XSkNCiAg ICAgICAgICBieSBzanNtdHAwMS51bmlwaGFzZS5jb20gKExvdHVzIERvbWlubyBSZWxlYXNlIDUu MDdhKQ0KICAgICAgICAgIHdpdGggU01UUCBpZCAyMDAxMDkxNzA2NDA0NTcwOjM0MjY1NSA7DQog ICAgICAgICAgTW9uLCAxNyBTZXAgMjAwMSAwNjo0MDo0NSAtMDcwMCANClJlY2VpdmVkOiBGUk9N IGNoZXJyeS5lYXNlLmxzb2Z0LmNvbSBCWSBzanNtdHAwMS51bmlwaGFzZS5jb20gOyBNb24gU2Vw IDE3IDA2OjQwOjQ0IDIwMDEgLTA3MDANClJlY2VpdmVkOiBmcm9tIFBFQVIuRUFTRS5MU09GVC5D T00gKDIwOS4xMTkuMC4xOSkgYnkgY2hlcnJ5LmVhc2UubHNvZnQuY29tIChMU01UUCBmb3IgRGln aXRhbCBVbml4IHYxLjFiKSB3aXRoIFNNVFAgaWQgPDE4LjAwNDExMEM5QGNoZXJyeS5lYXNlLmxz b2Z0LmNvbT47IE1vbiwgMTcgU2VwIDIwMDEgOTo0OTozNSAtMDQwMA0KUmVjZWl2ZWQ6IGZyb20g TUlUVk1BLk1JVC5FRFUgYnkgTUlUVk1BLk1JVC5FRFUgKExJU1RTRVJWLVRDUC9JUCByZWxlYXNl IDEuOGQpDQogICAgICAgICAgd2l0aCBzcG9vbCBpZCA2OTU4IGZvciBQSUNMSVNUQE1JVFZNQS5N SVQuRURVOyBNb24sIDE3IFNlcCAyMDAxDQogICAgICAgICAgMDk6NDk6MDIgLTA0MDANClJlY2Vp dmVkOiBmcm9tIE1JVFZNQSAoTkpFIG9yaWdpbiBTTVRQQE1JVFZNQSkgYnkgTUlUVk1BLk1JVC5F RFUgKExNYWlsDQogICAgICAgICAgVjEuMmQvMS44ZCkgd2l0aCBCU01UUCBpZCA5ODQwOyBNb24s IDE3IFNlcCAyMDAxIDA5OjQ3OjA4IC0wNDAwDQpSZWNlaXZlZDogZnJvbSAqdW5rbm93biBbMjA0 LjIxNS42MC4xNV0gYnkgbWl0dm1hLm1pdC5lZHUgKElCTSBWTSBTTVRQIExldmVsDQogICAgICAg ICAgMzIwKSB2aWEgVENQIHdpdGggRVNNVFAgOyBNb24sIDE3IFNlcCAyMDAxIDA5OjQ3OjA3IEVE VA0KWC1XYXJuaW5nOiBtaXR2bWEubWl0LmVkdTogSG9zdCAqdW5rbm93biBjbGFpbWVkIHRvIGJl IGRhbGxhcy5uZXQNClJlY2VpdmVkOiBmcm9tIHBpaWk1MDBhICh0bnQtZGFsLTE5My5kYWxsYXMu bmV0IFsyMDkuNDQuNDEuMTkzXSkgYnkgZGFsbGFzLm5ldA0KICAgICAgICAgICg4LjEyLjAuQmV0 YTUvOC45LjMpIHdpdGggU01UUCBpZCBmOEhEa21vWjAxMzU5MiBmb3INCiAgICAgICAgICA8UElD TElTVEBNSVRWTUEuTUlULkVEVT47IE1vbiwgMTcgU2VwIDIwMDEgMDg6NDY6NTIgLTA1MDAgKENE VCkNClJlZmVyZW5jZXM6IDxQaW5lLkxOWC40LjIxLjAxMDkxNDExNDU0MzAuMjE5OTItMTAwMDAw QHByb2YucG1tZi5odT4gDQogICAgICAgICAgICA8NC4zLjIuNy4yLjIwMDEwOTE3MDEyMTEwLjAy ODI0MTAwQG1haWwuY2VkYXIubmV0Pg0KTUlNRS1WZXJzaW9uOiAxLjANClgtUHJpb3JpdHk6IDMg KE5vcm1hbCkNClgtTVNNYWlsLVByaW9yaXR5OiBOb3JtYWwNClgtTWFpbGVyOiBNaWNyb3NvZnQg T3V0bG9vayBFeHByZXNzIDUuNTAuNDEzMy4yNDAwDQpYLU1pbWVPTEU6IFByb2R1Y2VkIEJ5IE1p Y3Jvc29mdCBNaW1lT0xFIFY1LjUwLjQxMzMuMjQwMA0KTWVzc2FnZS1JRDogIDwwMDQ1MDFjMTNm N2YkNmFhYjZiMjAkMDEwMGE4YzBAcGlpaTUwMGE+DQpEYXRlOiAgICAgICAgIE1vbiwgMTcgU2Vw IDIwMDEgMDg6NDg6MTMgLTA1MDANClJlcGx5LVRvOiAgICAgcGljIG1pY3JvY29udHJvbGxlciBk aXNjdXNzaW9uIGxpc3QgPFBJQ0xJU1RATUlUVk1BLk1JVC5FRFU+DQpTZW5kZXI6ICAgICAgIHBp YyBtaWNyb2NvbnRyb2xsZXIgZGlzY3Vzc2lvbiBsaXN0IDxQSUNMSVNUQE1JVFZNQS5NSVQuRURV Pg0KRnJvbTogICAgICAgICBKaW0gPGp2cG9sbEBEQUxMQVMuTkVUPg0KU3ViamVjdDogICAgICBS ZTogW09UXTpjZWxsIHBob25lIGxvY2F0aW5nDQpUbzogICAgICAgICAgIFBJQ0xJU1RATUlUVk1B Lk1JVC5FRFUNClgtTUlNRVRyYWNrOiBJdGVtaXplIGJ5IFNNVFAgU2VydmVyIG9uIFNKU01UUDAx L1NlcnZlci9KRFNVbmlwaGFzZShSZWxlYXNlIDUuMDdhIHxNYXkgMTQsIDIwMDEpIGF0DQogMDkv MTcvMjAwMSAwNjo0MDo0NSBBTSwNCglTZXJpYWxpemUgYnkgUm91dGVyIG9uIFNKU01UUDAxL1Nl cnZlci9KRFNVbmlwaGFzZShSZWxlYXNlIDUuMDdhIHxNYXkgMTQsIDIwMDEpIGF0DQogMDkvMTcv MjAwMSAwNjo0NDowMCBBTSwNCglTZXJpYWxpemUgY29tcGxldGUgYXQgMDkvMTcvMjAwMSAwNjo0 NDowMCBBTQ0KWC1Ob3Rlcy1JdGVtOiAxODsNCiB0eXBlPTMwMDsgbmFtZT0kSG9wcw0KWC1Ob3Rl cy1JdGVtOiBNZW1vOw0KIG5hbWU9Rm9ybQ0KWC1Ob3Rlcy1JdGVtOiBDTj1TSlNNVFAwMS9PVT1T ZXJ2ZXIvTz1KRFNVbmlwaGFzZTsNCiB0eXBlPTUwMTsgZmxhZ3M9NDQ7IG5hbWU9JFVwZGF0ZWRC eQ0KQ29udGVudC1UcmFuc2Zlci1FbmNvZGluZzogN2JpdA0KQ29udGVudC1UeXBlOiB0ZXh0L3Bs YWluOyBjaGFyc2V0PSJpc28tODg1OS0xIg0KDQogICAgIllvdSdyZSBhd2FyZSB0aGF0IEdQUyBy ZWNlaXZlcnMgbmVlZA0KICAgICBhIGNsZWFyIHZpZXcgb2YgdGhlIHNreSwgcmlnaHQ/DQoNCiAg ICAgVGhleSBkb24ndCB3b3JrIGV2ZW4gaW4gYSB3b29kZW4NCiAgICAgaG91c2UuIg0KDQpIbW1t ICAtIEkndmUgaGFkIChhbmQgY29udGludWUgdG8gaGF2ZSkgZ29vZA0KcmVzdWx0cyB3aXRoIEdQ UyBpbiBteSB3b29kZW4gcm9vZi9icmljaw0KZmFjYWRlIGhvbWUgLi4uDQoNCkFsc28sIHlvdSBt aWdodCB3YW50IHRvIGxvb2sgaW50byB3aGF0DQp3d3cuc25hcHRyYWNrLmNvbSBpcyBhYmxlIHRv IGFjaGlldmUgYXMgZmFyDQphcyByZXN1bHRzIHdpdGhpbiBzdHJ1Y3R1cmVzLCBhbmQgdGhlbiB0 aGVyZQ0KaXMgYWxzbyB0aGUgb3BlcmF0aW9uYWwgc2NlbmFyaW8gd2hlcmUgVEhFDQpQSE9ORS9H UFMgY29tYm8gKnJlbWVtYmVycyogdGhlIGxhc3Qga25vd24NCmdvb2QgZml4IEdQUyBwb3NpdGlv biBmaXggLi4uDQoNCkppbQ0KDQotLS0tLSBPcmlnaW5hbCBNZXNzYWdlIC0tLS0tDQpGcm9tOiAi RGF2aWQgVmFuSG9ybiIgPGR2YW5ob3JuQENFREFSLk5FVD4NClRvOiA8UElDTElTVEBNSVRWTUEu TUlULkVEVT4NClNlbnQ6IE1vbmRheSwgU2VwdGVtYmVyIDE3LCAyMDAxIDE6MjIgQU0NClN1Ympl Y3Q6IFJlOiBbT1RdOmNlbGwgcGhvbmUgbG9jYXRpbmcNCg0KDQo+ID4NCj4gPmEgbmF0aW9uYWwg YXV0aG9yaXR5IGNvdWxkIG9yZGVyIGFsbCBjZWxsIHBob25lcyBzaG91bGQgYmUgYXR0YWNoZWQg d2l0aA0KYQ0KPiA+R1BTIHJlY2VpdmVycyBhbmQgb24gYSByZXF1ZXN0IG9mIHRoZSBjZW50cmFs IHRvd2VyIHRoZXkgc291bGQgZ2l2ZSB0aGVpcg0KPiA+cG9zaXRpb25zIGltbWVkaWF0ZWx5LiBU aGUgd2hvbGUgdGhpbmcgY291bGQgYmUgdHJhbnNwYXJlbnQgdG8gdGhlIHVzZXINCj4gPnN1Y2gg d2F5IGl0IGNhbiBiZSBldmVuIGhpZGRlbi4gV2hvIGtub3dzIHdoZXRoZXIgaXQgaGFzIGJlZW4g ZG9uZQ0KPiA+YWxyZWFkeT8gOy0pDQo+ID5JIGFtIG5vdCBwYXJhbm9pZC4gQnV0IEFuZHkgR3Jv dmUgaGFzIHdyaXR0ZW4gdGhlIGJvb2sgd2l0aCB0aXRsZTogT25seQ0KPiA+UGFyYW5vaWRzIHN1 cnZpdmUuDQo+DQo+IFlvdSdyZSBhd2FyZSB0aGF0IEdQUyByZWNlaXZlcnMgbmVlZCBhIGNsZWFy IHZpZXcgb2YgdGhlIHNreSwgcmlnaHQ/DQo+IFRoZXkgZG9uJ3Qgd29yayBldmVuIGluIGEgd29v ZGVuIGhvdXNlLg0KPiBVbmRlciBhIGNhciByb29mIGlzIHNoYWt5Lg0KPg0KPiAtLQ0KPiBEYXZl J3MgRW5naW5lZXJpbmcgUGFnZTogaHR0cDovL3d3dy5kdmFuaG9ybi5vcmcNCj4NCj4gSSB3b3Vs ZCBoYXZlIGEgbGluayB0byBodHRwOi8vd3d3LmZpbmR1LmNvbS9jZ2ktYmluL2ZpbmQuY2dpP0tD NkVURS05IGhlcmUNCj4gaW4gbXkgc2lnbmF0dXJlIGxpbmUsIGJ1dCBkdWUgdG8gdGhlIGluYWJp bGl0eSBvZiBzeXNhZG1pbnMgYXQgVEVMT0NJVFkgdG8NCj4gZGlmZmVyZW50aWF0ZSBhIHNpZ25h dHVyZSBsaW5lIGZyb20gdGhlIHRleHQgb2YgYW4gZW1haWwsIEkgYW0gZm9yYmlkZGVuDQp0bw0K PiBoYXZlIGl0Lg0KPg0KPiAtLQ0KPiBodHRwOi8vd3d3LnBpY2xpc3QuY29tI25vbWFpbCBHb2lu ZyBvZmZsaW5lPyBEb24ndCBBdXRvUmVwbHkgdXMhDQo+IGVtYWlsIGxpc3RzZXJ2QG1pdHZtYS5t aXQuZWR1IHdpdGggU0VUIFBJQ0xpc3QgRElHRVNUIGluIHRoZSBib2R5DQo+DQo+DQoNCi0tDQpo dHRwOi8vd3d3LnBpY2xpc3QuY29tI25vbWFpbCBHb2luZyBvZmZsaW5lPyBEb24ndCBBdXRvUmVw bHkgdXMhDQplbWFpbCBsaXN0c2VydkBtaXR2bWEubWl0LmVkdSB3aXRoIFNFVCBQSUNMaXN0IERJ R0VTVCBpbiB0aGUgYm9keQ0KDQoNCg== --0__=85256ACA004D538A8f9e8a93df938690918c85256ACA004D538A-- -- http://www.piclist.com#nomail Going offline? Don't AutoReply us! email listserv@mitvma.mit.edu with SET PICList DIGEST in the body