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<DIV>Since the CCIR measurements were made with an omnidirectional antenna,they
would have to be an average. However, when I had a 5-element 10 meter beam
in the Los Angeles area, I never saw anything below 20 dB even with the band
closed. If there is a switchable RF preamplifier, most conditons should be able
to be accomodated.</DIV>
<DIV> </DIV>
<DIV>73,</DIV>
<DIV> </DIV>
<DIV>John</DIV>
<DIV>KD6OZH</DIV>
<DIV> </DIV>
<BLOCKQUOTE
style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B>
<A title=KA2WEU@aol.com href="mailto:KA2WEU@aol.com">KA2WEU@aol.com</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A title=grant@ghengineering.co.uk
href="mailto:grant@ghengineering.co.uk">grant@ghengineering.co.uk</A> ; <A
title=hpsdr@hpsdr.org href="mailto:hpsdr@hpsdr.org">hpsdr@hpsdr.org</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Friday, August 11, 2006 15:44
UTC</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: [hpsdr] MDS</DIV>
<DIV><BR></DIV>***** High Performance Software Defined Radio Discussion List
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<DIV>
<DIV>This is somewhat inconsistent with my measurements with a beam on 17 to
10 m. I would loook for a sensitivity of a NF of 6Dm...</DIV>
<DIV> </DIV>
<DIV>73 de Ulrich, N1UL</DIV>
<DIV> </DIV>
<DIV> </DIV>
<DIV> </DIV>
<DIV>In a message dated 11.08.2006 14:23:27 Westeuropäische Normalzeit, <A
href="mailto:grant@ghengineering.co.uk">grant@ghengineering.co.uk</A>
writes:</DIV>
<BLOCKQUOTE
style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: blue 2px solid"><FONT
style="BACKGROUND-COLOR: transparent" face=Arial color=#000000 size=2>*****
High Performance Software Defined Radio Discussion List
*****<BR><BR>John<BR><BR>Many thanks for posting this - I've never seen it
before. Please could you<BR>post the data for 160m and 6m as well if
you have it, to complete the list?<BR><BR>regards<BR><BR>Grant
G8UBN<BR><BR>>Minimum atmospheric noise levels (above thermal noise) for
the HF bands in<BR>the quietest locations at the quietest time of the year
are:<BR><BR>>80 m 38 dB<BR>>40 m 33 dB<BR>>20 m
28 dB<BR>>15 m 23 dB<BR>>10 m 18 dB<BR><BR>>This is
according to CCIR surveys. The receiver NF should be 6-10 dB
lower.<BR></FONT></BLOCKQUOTE></DIV>
<DIV></DIV>
<DIV> </DIV></FONT>
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