Author Topic: What does a Block Diagram Symbol "Pi" mean?  (Read 1469 times)

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Offline NY2KWTopic starter

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What does a Block Diagram Symbol "Pi" mean?
« 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
 

Offline jmelson

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Re: What does a Block Diagram Symbol "Pi" mean?
« Reply #1 on: February 24, 2020, 10:30:58 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
An adjustable Pi section attenuator?

Jon
 

Offline NY2KWTopic starter

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Re: What does a Block Diagram Symbol "Pi" mean?
« Reply #2 on: February 25, 2020, 02:08:43 am »
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.

 
 

Offline Brumby

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Re: What does a Block Diagram Symbol "Pi" mean?
« Reply #3 on: February 25, 2020, 04:44:57 am »
Duhh.. feel like an idiot missing the obvious.

You'll fit right in here...!   ;D
 

Offline CatalinaWOW

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Re: What does a Block Diagram Symbol "Pi" mean?
« Reply #4 on: February 25, 2020, 05:53:34 am »
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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