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I know it won't go up 3dB. I'm not saying it will The carrier is a continuous wave signal rather than noise. You aren't proving anything relevant with your latest example?

What you are overlooking is that in order to assess the noise performance of an amplifier stage you have to measure the NOISE level from it at some point.

You keep arguing (and quoting) the RBW vs sensitivity case for measuring a carrier. It isn't relevant. You don't 'need' to measure a carrier signal in order to measure the noise figure of an amplifier.

But you do need to measure noise power at least once

When you measure that noise from an amplifier then there is no benefit to using a very narrow RBW to measure the noise as it won't enhance the sensitivity when measuring NOISE.

If you disagree with this quote from HP then you are disagreeing with modern physics and (hopefully) every RF engineer on the planet

<blockquote data-quote="G0HZU" data-source="post: 413114" data-attributes="member: 19109">I know it won&#039;t go up 3dB. I&#039;m not saying it will <img src="https://cdn.jsdelivr.net/joypixels/assets/8.0/png/unicode/64/1f642.png" class="smilie smilie--emoji" loading="lazy" width="64" height="64" alt=":)" title="Smile&nbsp; &nbsp; :)"&nbsp; data-smilie="1"data-shortname=":)" /> The carrier is a continuous wave signal rather than noise. You aren&#039;t proving anything relevant with your latest example?What you are overlooking is that in order to assess the noise performance of an amplifier stage you have to measure the NOISE level from it at some point.You keep arguing (and quoting) the RBW vs sensitivity case for measuring a carrier. It isn&#039;t relevant. You don&#039;t &#039;need&#039; to measure a carrier signal in order to measure the noise figure of an amplifier. But you do need to measure noise power at least once <img src="https://cdn.jsdelivr.net/joypixels/assets/8.0/png/unicode/64/1f642.png" class="smilie smilie--emoji" loading="lazy" width="64" height="64" alt=":)" title="Smile&nbsp; &nbsp; :)"&nbsp; data-smilie="1"data-shortname=":)" />When you measure that noise from an amplifier then there is no benefit to using a very narrow RBW to measure the noise as it won&#039;t enhance the sensitivity when measuring NOISE.If you disagree with this quote from HP then you are disagreeing with modern physics and (hopefully) every RF engineer on the planet <img src="https://cdn.jsdelivr.net/joypixels/assets/8.0/png/unicode/64/1f642.png" class="smilie smilie--emoji" loading="lazy" width="64" height="64" alt=":)" title="Smile&nbsp; &nbsp; :)"&nbsp; data-smilie="1"data-shortname=":)" /></blockquote>

[QUOTE="G0HZU, post: 413114, member: 19109"] I know it won't go up 3dB. I'm not saying it will :) The carrier is a continuous wave signal rather than noise. You aren't proving anything relevant with your latest example? What you are overlooking is that in order to assess the noise performance of an amplifier stage you have to measure the NOISE level from it at some point. You keep arguing (and quoting) the RBW vs sensitivity case for measuring a carrier. It isn't relevant. You don't 'need' to measure a carrier signal in order to measure the noise figure of an amplifier. But you do need to measure noise power at least once :) When you measure that noise from an amplifier then there is no benefit to using a very narrow RBW to measure the noise as it won't enhance the sensitivity when measuring NOISE. If you disagree with this quote from HP then you are disagreeing with modern physics and (hopefully) every RF engineer on the planet :) [/QUOTE]

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