John Curl's Blowtorch preamplifier part II

[PMA]

Please consider the measured level. It is expressed in dBm, 0V dBm would be 224mV here. Top of the plot is -30dBm, and there are 10dBm per division.

 

[jan.didden]

Please consider the measured level. It is expressed in dBm, 0V dBm would be 224mV here. Top of the plot is -30dBm, and there are 10dBm per division.

So then in your last plot the marker is at -81.xx dBm that would then be -81.xx dBm re: 0dBm @ 224mV?
-80dBm would then be 22.4uV, correct? For 6dB higher as in the previous plot (-74dBm) that would be double, 44.8uV, correct?

jd

 

[syn08]

Please consider the measured level. It is expressed in dBm, 0V dBm would be 224mV here. Top of the plot is -30dBm, and there are 10dBm per division.

-74dBm is equivalent to:

1mW*10^(-74/10) = 3.98*10^-8 mW = 3.98*10^-11W

The equivalent voltage is

SQRT(3.98*10^-11W * 50 ohm)= SQRT(2*10^-9)=4.47*10^-5V=44.7uV

Otherwise, I agree with Demian.

 

[jan.didden]

-74dBm is equivalent to:

1mW*10^(-74/10) = 3.98*10^-8 mW = 3.98*10^-11W

The equivalent voltage is

SQRT(3.98*10^-11W * 50 ohm)= SQRT(2*10^-9)=4.47*10^-5V=44.7uV

Otherwise, I agree with Demian.

I see that I'm 0.1uV off...

jd

 

[syn08]

I see that I'm 0.1uV off...

Yes. The lack of attention on such details certainly explains why you are not a successfull audio designer.

 

[Bas Horneman]

Yes. The lack of attention on such details certainly explains why you are not a successfull audio designer

And the lack of attention you give to your spelling surely must explain why you have not become a successful writer.

 

[syn08]

And the lack of attention you give to your spelling surely must explain why you have not become a successful writer.

This is priceless feedback, coming from a DIYAudio moderator. Thank you very much, I'll save your suggestion for the time I'll consider a professional writer career.

 

[Bas Horneman]

a professional writer career.

a professional writing career. Is what you meant to say?

Thank you very much

You are very welcome!

 

[syn08]

a professional writing career. Is what you meant to say?

No.

How to Become a Writer: Education and Training Requirements for Becoming a Professional Writer

Moderate yourself, apparently your hand is trembling in excitment on the mouse.

 

[stinius]

And the lack of attention you give to your spelling surely must explain why you have not become a successful writer.

One extra L sometimes makes a successful design.

Anyway I think syn08’s post was meant as an inside joke, and not meant to hurt Mr. Didden.

 

[Bas Horneman]

No.

How to Become a Writer: Education and Training Requirements for Becoming a Professional Writer

Moderate yourself, apparently your hand is trembling in excitment on the mouse.

Actually it is like this:

I would like to become a professional writer.

BUT

I am considering a professional writing career.

 

[Bas Horneman]

Anyway I think syn08’s post was meant as an inside joke, and not meant to hurt Mr. Didden.

I used the same humour. (UK spelling)

But after seeing syn08's reply. I don't think syn08 likes his own jokes?

That post was also not made in my capacity as a mod. Because I did not have my hat on.

 

[syn08]

One extra L sometimes makes a successful design.

Anyway I think syn08’s post was meant as an inside joke, and not meant to hurt Mr. Didden.

Of course; I'm though not responsible for the lack of appropriate emoticons, including my favorite. Anyway, at this point, my ** meter is off scale.

 

[john curl]

I hope that everyone notes this.

 

[john curl]

It's called 'parsing', Jan. I get it all the time.

 

[syn08]

I hope that everyone notes this.

What?

 

[jan.didden]

Yes. The lack of attention on such details certainly explains why you are not a successfull audio designer.

Well, you know what they say: Those who can, do, those who can't, teach ....

jd

 

[jan.didden]

It's called 'parsing', Jan. I get it all the time.

Huh?

jd

 

[jan.didden]

Please consider the measured level. It is expressed in dBm, 0V dBm would be 224mV here. Top of the plot is -30dBm, and there are 10dBm per division.

... but a page onward, and we still don't know the point, if any, of this post. Pavel, pray tell?

jd

 

[jan.didden]

Actually it is like this:

I would like to become a professional writer.

BUT

I am considering a professional writing career.

Yeah. Five years ago I couldn't even spell 'exbert' and now I are one...

jd