Follow up on beam patterns - Electronic Circuits Projects Diagrams Free

Electronics4you · 22nd July 2006, 12:40 PM

Hi There,

I just need an answer on a very simple (not to me) question.
What does the x-axis of this beam pattern represent? Lenght, time...?

**Nigel Goodwin** · 22nd July 2006, 12:51 PM

There's isn't really an x-axis, just a y-axis and an angular value. As the y-axis rotates 90 degrees it appears where the x-axis would be on a normal graph. The graph should really show 180 degrees, and not just 90 degrees.

Electronics4you · 22nd July 2006, 12:52 PM

Ok, but the 1', 2'... must mean something, normally it would be the signal power in dB

**Nigel Goodwin** · 22nd July 2006, 01:03 PM

Quote:

Originally Posted by Electronics4you

Ok, but the 1', 2'... must mean something, normally it would be the signal power in dB

Could be power, could be distance - pretty much the same thing anyway.

JimB · 22nd July 2006, 03:53 PM

For a graph like this, it is probably best not to think of it having an "x-axis".

This is a "polar plot", where something is plotted against an angle.
The "x-axis" is just the scaling of the radial rings.

But what that scaling is, is a bit vague.

The notation 1', 2', 3' etc infers a distance measurment in feet.
Maybe the distance from the source which gives some signal strength.

Vague and ambiguous is my best description for it.

JimB

Thread Tools
Show Printable Version Email this Page
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode

22nd July 2006, 12:51 PM	(permalink)
Nigel Goodwin	There's isn't really an x-axis, just a y-axis and an angular value. As the y-axis rotates 90 degrees it appears where the x-axis would be on a normal graph. The graph should really show 180 degrees, and not just 90 degrees. __________________ PIC programmer software, and PIC Tutorials at: http://www.winpicprog.co.uk

22nd July 2006, 12:52 PM	(permalink)
Electronics4you	Ok, but the 1', 2'... must mean something, normally it would be the signal power in dB

22nd July 2006, 03:53 PM	(permalink)
JimB	For a graph like this, it is probably best not to think of it having an "x-axis". This is a "polar plot", where something is plotted against an angle. The "x-axis" is just the scaling of the radial rings. But what that scaling is, is a bit vague. The notation 1', 2', 3' etc infers a distance measurment in feet. Maybe the distance from the source which gives some signal strength. Vague and ambiguous is my best description for it. JimB __________________ Experience is directly proportional to the value of the equipment ruined.