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1. [TowerTalk] Thermal Noise Levels (score: 1): Author: jimr.reid@verizon.net (Jim Reid); Date: Sun, 30 Dec 2001 08:28:32 -1000; Hi, Need my memory jogged! I believe I recall that the kTB value, at near room temperature, and in a 1 mHz bandwidth, the formula will calculate to be -114 dBm of noise power -- is this correct? Or c; /archives//html/Towertalk/2001-12/msg00604.html (7,843 bytes)
2. [TowerTalk] Thermal Noise Levels (score: 1): Author: W4EF@dellroy.com (Mike); Date: Sun, 30 Dec 2001 11:32:05 -0800; Hi Jim, Yes, your numbers are correct - here are the formulae: k = 1.38 x 10^-23 Joules/(deg K) T = 290 K B = 10^6 Hz Pdbm = 10 * log (kTB) + 30 = -113.9 dBm 73 de Mike, W4EF.........................; /archives//html/Towertalk/2001-12/msg00606.html (9,207 bytes)
3. [TowerTalk] Thermal Noise Levels (score: 1): Author: SPELUNK.SUENO@prodigy.net (EUGENE SMAR); Date: Sun, 30 Dec 2001 20:24:53 -0500; Jim: My college engineering book shows Boltzman's constant as 1.38*10^-23 Joules/K. Does that help any? 73 de Gene Smar AD3F --Original Message-- From: Jim Reid <jimr.reid@verizon.net> To: towertalk@; /archives//html/Towertalk/2001-12/msg00607.html (8,506 bytes)
4. [TowerTalk] Thermal Noise Levels (score: 1): Author: x703jko@starpower.net (Jeffrey Okamitsu); Date: Sun, 30 Dec 2001 17:09:07 -0500; Jim: k=1.38E-23 J/K (Boltzmann's Constant) T=298K (Room temperature in Kelvin) B=1 MHz (Noise bandwidth) Check units: kT has units of Joules (energy) and, hence, kTB has units of W (power). Hence, U=; /archives//html/Towertalk/2001-12/msg00608.html (9,164 bytes)
5. [TowerTalk] Thermal Noise Levels (score: 1): Author: jimr.reid@verizon.net (Jim Reid); Date: Sun, 30 Dec 2001 13:33:28 -1000; Wow, thank you to the several who have confirmed my dim memory, hi. I rcv'd both private and reflector responses, some in great detail, working it all out. -114 dBm ( or most accurately calculated by; /archives//html/Towertalk/2001-12/msg00609.html (7,692 bytes)
6. [TowerTalk] Thermal Noise Levels (score: 1): Author: x703jko@starpower.net (Jeffrey Okamitsu); Date: Sun, 30 Dec 2001 19:10:07 -0500; Jim....units are dBm and dBm per MHz. Jeff AN Wireless Self Supporting Towers are now available! Windloading tables, foundation diagrams and charts, along with full details are now at the AN Wireless; /archives//html/Towertalk/2001-12/msg00610.html (8,531 bytes)

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