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<p class=MsoNormal><span lang=EN-US style='color:#1F497D'>Ari,<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='color:#1F497D'>terminate your
radio with a 50 Ohms load, select SigAvg at the meter and select
bandwidth e.g. 2700 Hz.<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='color:#1F497D'>Read the meter value
in dBm. <o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='color:#1F497D'>Now select bandwidth
500 Hz and you will observe that the meter reading drops down by 7.3 dB, which
is equal 10 log (2700/500).<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='color:#1F497D'>If the radio is well
calibrated – usually ex factory- you can even determine the noise figure
of your radio without external instrumentation using the well known equation:<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='color:#1F497D'>Noise figure NF
= MDS + 174 dBm – 10 log Bandwidth<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='color:#1F497D'>MDS means ‘minimum
discernible signal’ measured in dBm.<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='color:#1F497D'>Same procedure works
with the noise floor shown in the Panadapter, where Bin width has to used for the
correction term.<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='color:#1F497D'>73, Helmut, DC6NY<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
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