[hpsdr] MDS

[Eric Ellison]

Bob

Love ya man! (smile)

Eric


***** Bob - N4HY said:

I see no reason to change 
my opinion at this time.

73's
Bob
N4HY


John B. Stephensen wrote:
> ***** High Performance Software Defined Radio Discussion List *****
>
>   
>
> ------------------------------------------------------------------------
>
> 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.
>  
> 73,
>  
> John
> KD6OZH
>  
>
>     ----- Original Message -----
>     *From:* KA2WEU at aol.com <mailto:KA2WEU at aol.com>
>     *To:* grant at ghengineering.co.uk <mailto:grant at ghengineering.co.uk>
>     ; hpsdr at hpsdr.org <mailto:hpsdr at hpsdr.org>
>     *Sent:* Friday, August 11, 2006 15:44 UTC
>     *Subject:* Re: [hpsdr] MDS
>
>     ***** High Performance Software Defined Radio Discussion List *****
>
>
------------------------------------------------------------------------
>     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...
>      
>     73 de Ulrich, N1UL
>      
>      
>      
>     In a message dated 11.08.2006 14:23:27 Westeuropäische Normalzeit,
>     grant at ghengineering.co.uk <mailto:grant at ghengineering.co.uk> writes:
>
>         ***** High Performance Software Defined Radio Discussion List
>         *****
>
>         John
>
>         Many thanks for posting this - I've never seen it before. 
>         Please could you
>         post the data for 160m and 6m as well if you have it, to
>         complete the list?
>
>         regards
>
>         Grant G8UBN
>
>         >Minimum atmospheric noise levels (above thermal noise) for
>         the HF bands in
>         the quietest locations at the quietest time of the year are:
>
>         >80 m  38 dB
>         >40 m  33 dB
>         >20 m  28 dB
>         >15 m  23 dB
>         >10 m  18 dB
>
>         >This is according to CCIR surveys. The receiver NF should be
>         6-10 dB lower.
>
>      
>
>
------------------------------------------------------------------------
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-- 
AMSAT VP Engineering. Member: ARRL, AMSAT-DL, TAPR, Packrats,
NJQRP/AMQRP, QRP ARCI, QCWA, FRC. ARRL SDR Wrk Grp Chairman
"An expert is a man who has made all the mistakes which can be
made in a very narrow field."  Niels Bohr

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