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1. Re: Topband: Hi Z amplifiers for 160m (LONG) (score: 1): Author: John Kaufmann via Topband <topband@contesting.com>; Date: Thu, 12 Mar 2020 19:37:39 -0400; To assess the impact of amplifier circuit noise in "active" receive arrays, we only need to be concerned with the contribution of amplifier circuit noise relative to atmospheric noise. The details of; /archives//html/Topband/2020-03/msg00137.html (12,544 bytes)
2. Re: Topband: Hi Z amplifiers for 160m (LONG) (score: 1): Author: Michael Tope <W4EF@dellroy.com>; Date: Fri, 13 Mar 2020 04:34:26 -0700; I agree with your conclusions regarding the case of isotropic atmospheric noise. This is the same reason that cold space looks like 3 Kelvin regardless of how high the antenna gain. As the antenna ga; /archives//html/Topband/2020-03/msg00143.html (15,253 bytes)
3. Re: Topband: Hi Z amplifiers for 160m (LONG) (score: 1): Author: John Kaufmann via Topband <topband@contesting.com>; Date: Fri, 13 Mar 2020 13:14:59 -0400; Hi Mike, Yes, the math can get tricky and cause you to get lost in the forest. I'm not afraid of doing math (I did a mathematics minor in graduate school) but as an engineer, I prefer to seek the sim; /archives//html/Topband/2020-03/msg00149.html (20,897 bytes)

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