[TowerTalk] Re; Need Help Remembering Something I Read

[Richard (Rick) Karlquist]

Interesting paper, lots of stuff to absorb.
The discussion of receiver noise figure brings
up a topic that has bothered me for a long time:
the use of excessively high gain external antenna preamps
(as high as 40 dB).  Somehow, this is supposed to
make up for a really low gain receiving antenna,
say -40 dBi.  Most practical external preamps have
an NF of around 3 dB.  With a gain of 10 dB, they
should be able to overcome receiver noise in most
cases, especially of the receiver's internal preamp
is selected.  If high gain is used, you are simply
listening to amplifier noise, instead of band
noise.

Rick N6RK

On 7/7/2018 3:44 AM, Dan Maguire wrote:
> Jim,
> 
> Might it have something to do with this presentation on "Receiving
> Antenna Metrics" by OH6LI?
> 
> http://wwrof.org/webinar-archive/receiving-antenna-metrics-with-examples/
> 
> Dan, AC6LA
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