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<p>This is my experience.</p>
<p>I just ran a test: My noise floor on 10 meters went up 20db when
I connected an antenna.</p>
<p>I do NOT think that I am receiver noise-figure limited.</p>
<p>Remember that too much gain ahead of the front end degrades
third-order intercept, etc.<br>
</p>
<p>73,</p>
<p>Jim</p>
<p><a class="moz-txt-link-abbreviated" href="mailto:wb4gcs@amsat.org">wb4gcs@amsat.org</a></p>
<p><br>
</p>
<div class="moz-cite-prefix">On 1/17/2019 10:27 PM, Byron Engler
wrote:<br>
</div>
<blockquote type="cite"
cite="mid:CANL+gNY9d1OwYw7HZa+t_EgaazgKhG-DfyxFL-YKEezL-DEACQ@mail.gmail.com">
<pre class="moz-quote-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>
</div>
<br>
<div class="gmail_quote">
<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>
</div>
<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>
<div>
<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>
<br
class="gmail-m_-8085719527528659711Apple-interchange-newline">
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<div dir="ltr">
<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>
</div>
<br>
<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>
</div>
<blockquote class="gmail_quote"
style="margin:0px 0px 0px
0.8ex;border-left:1px solid
rgb(204,204,204);padding-left:1ex">
<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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