[TowerTalk] Thermal Noise Levels

[EUGENE SMAR]

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@contesting.com <towertalk@contesting.com>
Date: Sunday, December 30, 2001 1:31 PM
Subject: [TowerTalk] Thermal Noise Levels


>
>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
>close.  If so,  and the bw were narrowed to 1 kHz,
>a 30 dB shrinkage,  the noise power would then
>be -144 dBm.  These numbers seem about correct.
>Appreciate a correction if I am not doing this right, hi.
>Yes,  the correct units must be used,  degrees K,  but
>I have no reference out here to the value of Boltzman's
>constant,  B.
>
>73,  Jim  KH7M
>
>
>
>AN Wireless Self Supporting Towers are now available!  Windloading tables,
>foundation diagrams and charts, along with full details are now at the
>AN Wireless Web site:  http://www.ANWireless.com
>
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AN Wireless Self Supporting Towers are now available!  Windloading tables,
foundation diagrams and charts, along with full details are now at the
AN Wireless Web site:  http://www.ANWireless.com

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