Re: Topband: Hi Z amplifiers for 160m (LONG)

2020-03-13 Thread John Kaufmann via Topband
nn=verizon@contesting.com] On Behalf Of Michael Tope Sent: Friday, March 13, 2020 7:34 AM To: topband@contesting.com Subject: Re: Topband: Hi Z amplifiers for 160m (LONG) I agree with your conclusions regarding the case of isotropic atmospheric noise. This is the same reason that cold space looks like

Re: Topband: Hi Z amplifiers for 160m (LONG)

2020-03-13 Thread Michael Tope
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 gain goes up you reinforce to a greater degree a lesser slice of the overall pie. This ends up

Re: Topband: Hi Z amplifiers for 160m (LONG)

2020-03-12 Thread John Kaufmann via Topband
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 how signals are phased in any particular array do not matter. The objective is to keep the