Mail Archive Search: <+subject:/^(?:^\s*(re|sv|fwd|fw)[\[\]\d]*[:>-]+\s*)*\[TowerTalk\]\s+600\s+Ohm\s+Line\s*$/>

Results:

References: [ +subject:/^(?:^\s*(re|sv|fwd|fw)[\[\]\d]*[:>-]+\s*)*\[TowerTalk\]\s+600\s+Ohm\s+Line\s*$/: 9 ]

Total 9 documents matching your query.

1. [TowerTalk] 600 Ohm Line (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Thu, 29 Jul 2004 09:46:01 -0500; What is coming into the house on a 600 ohm balanced pair? An RF transmission line I would believe. A telco line or audio line I would not. The military surplus field telephone transmission line bein; /archives//html/Towertalk/2004-07/msg00906.html (9,577 bytes)
2. Re: [TowerTalk] 600 Ohm Line (score: 1): Author: Jim Lux <jimlux@earthlink.net>; Date: Thu, 29 Jul 2004 10:05:07 -0700; What is coming into the house on a 600 ohm balanced pair? An RF transmission line I would believe. A telco line or audio line I would not. The military surplus field telephone transmission line bein; /archives//html/Towertalk/2004-07/msg00914.html (11,055 bytes)
3. Re: [TowerTalk] 600 Ohm Line (score: 1): Author: "Rick Karlquist" <richard@karlquist.com>; Date: Thu, 29 Jul 2004 10:26:12 -0700 (PDT); Turns out you can't consider the phone line as a lumped component even to get audio to the CO; moreover, the characteristic impedance is complex. This is why the phone company has to use loading coil; /archives//html/Towertalk/2004-07/msg00916.html (9,250 bytes)
4. RE: [TowerTalk] 600 Ohm Line (score: 1): Author: "Daron J. Wilson" <daron@wilson.org>; Date: Thu, 29 Jul 2004 11:23:03 -0700; Actually....the characteristic impedance of the phone wire is more like 100 ohms. The overall circuit impedance should be at about 600ohms when terminated and drawing current. The reason the loading; /archives//html/Towertalk/2004-07/msg00919.html (10,815 bytes)
5. Re: [TowerTalk] 600 Ohm Line (score: 1): Author: "EUGENE SMAR" <ersmar@comcast.net>; Date: Thu, 29 Jul 2004 19:02:31 +0100; TT: Rick is correct. The copper twisted-pair (TP) is considered a distributed reactance element. The loading coils are actually series inductors (remember the 88 mH toroidal coils we all used in the; /archives//html/Towertalk/2004-07/msg00922.html (10,589 bytes)
6. Re: [TowerTalk] 600 Ohm Line (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Thu, 29 Jul 2004 14:46:08 -0500; They go way back before the 70's, but they are LUMPED elements, and they are compensating in a LUMPED model. What's the old line -- "if you remember the 70's you weren't there?" I haven't worked in t; /archives//html/Towertalk/2004-07/msg00925.html (11,172 bytes)
7. Re: [TowerTalk] 600 Ohm Line (score: 1): Author: Jim Lux <jimlux@earthlink.net>; Date: Thu, 29 Jul 2004 13:15:34 -0700; I haven't worked in that part of the industry, but common sense and Transmission Lines 101 says that those modems had better be treating that line as the 60-100 ohm line that it really is of they are; /archives//html/Towertalk/2004-07/msg00928.html (10,614 bytes)
8. Re: [TowerTalk] 600 Ohm Line (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Thu, 29 Jul 2004 16:00:39 -0500; Yes. That's the modern equivalent of the passive equalizers both in the line driver and line receiver. But the modem MUST be doing its best to match the Z of the line -- the closer it gets to that id; /archives//html/Towertalk/2004-07/msg00931.html (10,816 bytes)
9. Re: [TowerTalk] 600 Ohm Line (score: 1): Author: "Gene Smar" <ersmar@comcast.net>; Date: Thu, 29 Jul 2004 19:31:05 -0400; Jim et al: My comments embedded below. 73 de Gene Smar AD3F distributed are Agreed that the loading coils are lumped elements, but I was referring to the long TP - correctly modeled as distributed el; /archives//html/Towertalk/2004-07/msg00934.html (10,359 bytes)

Current List: 1 - 9
Page: [1]