Electronics > Beginners

What does a Block Diagram Symbol "Pi" mean?

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NY2KW:
I thought I knew all of the block diagram symbols but I cannot find any reference that explains a box with the Greek symbol Pi with an arrow thru it.  Please help!

thanks

jmelson:

--- Quote from: NY2KW on February 24, 2020, 10:28:22 pm ---I thought I knew all of the block diagram symbols but I cannot find any reference that explains a box with the Greek symbol Pi with an arrow thru it.  Please help!

thanks

--- End quote ---
An adjustable Pi section attenuator?

Jon

NY2KW:
Duhh.. feel like an idiot missing the obvious.   The block diagram showed the Pi-Arrow box and then 3 plain boxes labelled ATTN (all digitally controlled) before the RF output but on the PCB I found 4 identical HMC307 attenuators... and the datasheet said nothing about them being Pi pads.   So I thought I was missing something on the PCB.  Now I read the fine print and the 1st HMC307 is controlled in 2 dB steps from 0-30 while the others are wired as all or nothing 0/30 dB.  Thanks for the quick reply.

 

Brumby:

--- Quote from: NY2KW on February 25, 2020, 02:08:43 am ---Duhh.. feel like an idiot missing the obvious.

--- End quote ---

You'll fit right in here...!   ;D

CatalinaWOW:
While I think you have nailed the meaning in this context, you will sometimes find an upper case pi being used to indicate a multiplication just as an upper case sigma is used to indicate a sum.  Comes from the math use of these characters and I've seen it most frequently in control system diagrams/drawings.

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