[hpsdr] MDS

[John B. Stephensen]

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 
  To: grant at ghengineering.co.uk ; hpsdr at hpsdr.org 
  Sent: Friday, August 11, 2006 15:44 UTC
  Subject: Re: [hpsdr] MDS


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  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 writes:
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    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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