[hpsdr] NOISE FLOOR

[Byron Engler]

Hi All,
I was under the impression that the effective received noise from a real
antenna in average conditions (on HF bands) contributes  more noise than
the front end amplifier, so installing fancier preamps, in general, wont
have much of a performance gain.

73
Byron
ZL3DXT

On Fri, Jan 18, 2019 at 4:10 PM Bob Stricklin <bstrick at n5brg.com> wrote:

> ***** High Performance Software Defined Radio Discussion List *****
>
> Take a look at these: https://www.sv1afn.com/j310preamp.html,
> http://advancedreceiver.com/page5.html for 28 MHz and up.
> Bob N5BRG
>
> On Jan 17, 2019, at 8:33 PM, Scott Traurig <scott.traurig at gmail.com>
> wrote:
>
> Bob,
>
> Do you have a suggestion for an HF preamp with better NF performance?
>
> 73,
>
> Scott/w-u-2-o
>
>
> On Thu, Jan 17, 2019 at 9:12 PM Bob Stricklin <bstrick at n5brg.com> wrote:
>
>>
>> DC6NY’s comment about the first amp setting the NF is correct and the
>> reason people add their own external preamp with better specs to improve
>> performance. The NF of 6dB reported by W-U-2-O is high and can be improved
>> adding a preamp which will become the first amp.
>>
>> Bob N5BRG
>>
>
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