Devices for connecting balanced and unbalanced feed lines/antennas. Also covers questions about ununs, unbalanced-to-unbalanced connection.
Questions tagged [balun]
106 questions
7
votes
2 answers
Why aren't there baluns that do BOTH balanced/unbalanced transformation and common mode current attenuation?
I have read myself blue, about baluns. Especially 1:1 ones.
Some claim they're only there to balance the unbalanced signal, and that's what's in the name also, but I find several that claims that the main thing at the point of a balun is common mode…
Hans Neve
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4
votes
3 answers
What is the capacitors purpose on a balun?
Per the subject, what is the capacitors purpose on a balun?
Used a lot on wire wound ferrite toroidal baluns.
t252
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4
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Does a dipole require a 1.5:1 balun?
Dipoles ideally have 72 ohms impedance. I know most of the time this isn't what one gets and it can vary a lot. But let's assume we can build this perfect dipole that exhibits this impedance.
Why do most designs just suggest a 1:1 balun for coax, if…
hjf
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3
votes
1 answer
Balun identification from picture
I thought maybe this was a 4:1 balun, but a number of 4:1 single core balun diagrams that I found online had different connections. N1HFX's balun page and the bottom of G4WPW's page show a connection of one wire directly from the balanced to the…
Paul
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3
votes
1 answer
How does a 1:4 current balun work?
I'm having little difficulties understanding the following schematic:
I understand the part regarding current distribution. I understand why this schematic suppresses common mode current. Also I realize that if Z1 = V/2I was 50 Ohm than the balun…
Aleksander Alekseev - R2AUK
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2
votes
4 answers
How do you construct a 1:1 balun?
I have been researching how to construct a 1:1 current balun. I have a few questions and am looking for feedback on what I plan to do.
First, I want to use the balun from 10m to 160m at 100w.
I plan to use an Amidon FT-140-61 toroid bifilar (2…
billabel
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2
votes
1 answer
What is the delay through a 1:4 Guanella balun?
I need to estimate the signal delay through the 1:4 Guanella balun shown here:
Is the delay simply the delay through the winding on CORE1 or CORE2?
For example, assume each winding comprises 0.1-m of coax with velocity factor of 0.78, is the…
Brian K1LI
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0
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2 meter coax cable balun dimensions for use with a ground plane?
I have a commercially manufactured ground plane antenna for 2 meters. It will be fed with about 150 feet of RG 8/U . I've seen pictures of a coil of the feed line going to a 2 meter ground plane; this is used as a balun.
I'm wondering if anyone can…
timbo20
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