Monday, April 2, 2012

Not only QRP

I am not only working QRP. I like the thrill of being heard with 5 watts or less, but sometimes is a little more power convenient. As you can see that from 5 watts to 50 watts is a fine leap. That means 10 db more! The difference between 50 and 100 watts is only 3 db gain. So 50 watts is a nice turning point if you want to use some more power. More is not really necessary. To have the same gain (10 db) from the turning point of 50 watts you need 500 watts.

This map shows the Es activity in Europe yesterday late afternoon on 6 meter. TEP is also taking place almost every day but only for south Europe. But this Es is promising. Hopefully in a few weeks also in North Europe.

8 comments:

  1. Hallo Paul, ik heb net een lezing gevolgd van PA3BNT over 50 MHz. Als je echt geluk hebt kom je in een situatie van gecombineerde ES-Tropo en TEP. Een contact met Braziliƫ ook met gewoon een rondstraler is dan mogelijk op 6m. Ik hoop dit jaar ook weer wat 6m te doen, phone en WSPR. 73, Bas

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    Replies
    1. Hallo Bas, ik kijk er weer naar uit. Altijd weer spannend. 73 Paul

      Delete
  2. Hallo Paul,
    De schaal van de horizontale lijn is lineair, waardoor de rode lijn gebogen is. Als je het vermogen op logarithmisch schaal aangeeft, dan wordt de gebogen rode lijn een rechte lijn.
    Verder kun je in samenhang met dB's beter met verhoudingen rekenen.
    10x is 10 dB, 2x is 3 dB
    73, Bert

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    Replies
    1. Hallo Bert, ja dat klopt. Je hebt helemaal gelijk. 73 Paul

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  3. Yes I have been thinking of using 50 watts on my K3. It is nice to see a graph like this. I clearly shows that my thinking was right about 50 watts! Thank you for a very informative post! 73 Keith N8CEP

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    Replies
    1. Hi Keith, your welcome. Thanks for leaving a comment. 73 Paul

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  4. Very interesting, Paul. Actually very little difference between 5 watts and 10 or 20. The gain appears after that, up to to 50 watts then the necessity of an amp for extensive db gain.

    Operators living in multi-family dwellings must usually make due with QRP for the usual rfi/tvi reasons. Also the close proximity to an indoor antenna if that is necessary.

    I know that is the way for me in my USA apartment. Here in France, living in a private house, more power would not pose a problem. However, I rarely use more than 5 watts even here. QRP has gotten to be a habit with me.

    Glad to read your wife is coming along ok.

    73 Dick

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  5. Hi Dick, only leaps of 10 db is effective and observable, so steps of 0.5 watt - 5 watt - 50 - watt - 500 watt - 5K watts makes sense. 73 Paul

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