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Exactly right, with any reasonably efficient antenna at HF.<br>
<br>
73, Greg, ZL3IX<br>
<br>
<div class="moz-cite-prefix">On 2019-01-18 04:27 p.m., Byron Engler
wrote:<br>
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<pre wrap="">***** High Performance Software Defined Radio Discussion List *****
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<div dir="ltr">Hi All,
<div>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.</div>
<div><br>
</div>
<div>73</div>
<div>Byron</div>
<div>ZL3DXT</div>
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<div dir="ltr" class="gmail_attr">On Fri, Jan 18, 2019 at 4:10
PM Bob Stricklin <<a href="mailto:bstrick@n5brg.com"
moz-do-not-send="true">bstrick@n5brg.com</a>> wrote:<br>
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<blockquote class="gmail_quote" style="margin:0px 0px 0px
0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">*****
High Performance Software Defined Radio Discussion List *****<br>
<br>
<div style="overflow-wrap: break-word;">
Take a look at these: <a
href="https://www.sv1afn.com/j310preamp.html"
target="_blank" moz-do-not-send="true">https://www.sv1afn.com/j310preamp.html</a>,
<a href="http://advancedreceiver.com/page5.html"
target="_blank" moz-do-not-send="true">http://advancedreceiver.com/page5.html</a> for
28 MHz and up.
<div>Bob N5BRG</div>
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<div><br>
<blockquote type="cite">
<div>On Jan 17, 2019, at 8:33 PM, Scott Traurig <<a
href="mailto:scott.traurig@gmail.com"
target="_blank" moz-do-not-send="true">scott.traurig@gmail.com</a>>
wrote:</div>
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class="gmail-m_-8085719527528659711Apple-interchange-newline">
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<div>Bob,</div>
<div><br>
</div>
<div>Do you have a suggestion for an HF preamp
with better NF performance?</div>
<div><br>
</div>
<div>73,</div>
<div><br>
</div>
<div>Scott/w-u-2-o</div>
<div><br>
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<div class="gmail_quote">
<div dir="ltr">On Thu, Jan 17, 2019 at 9:12 PM
Bob Stricklin <<a
href="mailto:bstrick@n5brg.com"
target="_blank" moz-do-not-send="true">bstrick@n5brg.com</a>>
wrote:<br>
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<br>
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.<br>
<br>
Bob N5BRG<br>
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