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BillDumke1-Visitor
1-Visitor
September 16, 2011
Solved

How do I solve a Free Space Loss equation?

  • September 16, 2011
  • 5 replies
  • 3922 views

I am trying to do a symbolic solution for the distance in feet for a given free space loss in dB and frequency in MHz. The formula originally came from a canned Excel spreadsheet.

Now want to solve for the distance in feet for a given frequency and free space loss.

Doing a symbolic solve,

Mathcad 15 M010 says cannot find a solution.

Mathcad 11 finds a solution in terms of the frequency in MHz and "lhs". What does "lhs" mean????

I need to be able to put this back into a spreadsheet, so can't use units here.

Bill

Best answer by Fred_Kohlhepp

This works if you reformulate it just a bit!

"lhs" translates to left hand side

5 replies

Fred_Kohlhepp23-Emerald IAnswer
23-Emerald I
September 16, 2011

This works if you reformulate it just a bit!

"lhs" translates to left hand side

MikeArmstrong1-Visitor
1-Visitor
September 16, 2011

Nicely done Fred.

Mike

BillDumke1-VisitorAuthor
1-Visitor
September 16, 2011

Well, I get two e-mails. But the answers from Fred and somebody else do not appear in the discussion. I will wait.

Bill

Fred_Kohlhepp23-Emerald I
23-Emerald I
September 16, 2011

I opened your file (*.mcd) using version 14, modified it to solve your problem, and saved it (*.xmcd)

Version 15 (which you say you have) will open that file, and it should display the same answer I got using 14.

What are you waiting for?

BillDumkeHome1-Visitor
1-Visitor
September 16, 2011

Fred & Mona,

When I log into the community with my work login, Bill Dumke, all I see is my first post. When I log out I see all of the thread, including your posts, Fred. So I just tried logging in with my home user name and password, William E. Dumke, and now it looks like it works.

Fred, thank you for the solution. I didn't know I could use a function in a solve block like that.

Mona, please fix this, so I can give Fred the credit for the solution. I can't do that from this log in.

Bill

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