Skip to main content

Timeline for Balun Polarity Importance

Current License: CC BY-SA 4.0

12 events
when toggle format what by license comment
S Oct 22, 2020 at 8:34 history suggested Glorfindel CC BY-SA 4.0
broken image fixed (click 'rendered output' or 'side-by-side' to see the difference); for more info, see https://gist.github.com/Glorfindel83/9d954d34385d2ac2597bbe864466259f
Oct 22, 2020 at 7:49 review Suggested edits
S Oct 22, 2020 at 8:34
Aug 12, 2016 at 1:57 history bumped CommunityBot This question has answers that may be good or bad; the system has marked it active so that they can be reviewed.
Jul 13, 2016 at 2:19 history tweeted twitter.com/StackElectronix/status/753051255023476736
Jul 13, 2016 at 2:13 comment added Captainj2001 Sparky's answer is absolutely correct, I was reading the diagram and incorrectly associating the top 2 nodes (Left/Right) as the balanced input and the bottom node as the unbalanced output port. My previous comments are incorrect based on this error (but they would still be true if the balun was wired the way I originally assumed).
Jul 13, 2016 at 1:19 answer added user105652 timeline score: 1
Jul 13, 2016 at 0:30 comment added Captainj2001 The only purpose of the balun here is to convert the balanced signal from the dipole antenna to an unbalanced signal that can be used for PCB routing on microstrip or CPW transmission lines. The polarity of the windings here will simply invert the "normal" signal. Equivalently, you could move the antenna \$\lambda/2\$ and achieve the same inversion.
Jul 12, 2016 at 23:42 comment added dwebber @Captainj2001 Forgot to tag
Jul 12, 2016 at 23:36 comment added dwebber From reading I found that when it is hooked up with the correct polarity: "The two windings must be in the same sense (dots at the same end). The magnetic fields of opposing balanced working currents will cancel each other out and so present very little impedance (other than the resistance of the wires) to these currents. Would this still hold up if one of the coils is backwards. Source: vk5ajl.com/projects/baluns.php
Jul 12, 2016 at 23:33 history edited dwebber CC BY-SA 3.0
spelling edit
Jul 12, 2016 at 23:26 comment added Captainj2001 The induced 180 degree phase shift shouldn't cause any problems, but it may depend on the external circuit.
Jul 12, 2016 at 23:08 history asked dwebber CC BY-SA 3.0