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Mark-T
Guest
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 Posted:
Fri Nov 18, 2005 1:35 am Post subject:
balun? |
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What is a balun, and what for?
How is it different than any other transformer?
Thanks,
Mark
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Bob Myers
Guest
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| Posted:
Fri Nov 18, 2005 1:35 am Post subject:
Re: balun? |
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"Mark-T" <mark-t2@lycos.com> wrote in message
news:1132268403.075151.210000@g14g2000cwa.googlegroups.com...
| Quote: | What is a balun, and what for?
|
The answer in this case is in the name: a "balun" is a device
for converting between an unbalanced line and a balanced
load, or vice-versa. Hence, BALanced-to-UNbalanced
(transformer, although not all "baluns" are transformer-like
devices - you can make a balun for a given frequency from
the right length of transmission line, f'rinstance). Pretty common
in antenna/transmission line work.
| Quote: |
How is it different than any other transformer?
|
For the transformer type, it's not, really, in the basic
theory of the thing - it's more in how it's connected, and
in practice that generally it is intended for high-frequency,
fairly broadband operation (very high, compared to power
transformers and the like).
Bob M. |
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Michael A. Terrell
Guest
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| Posted:
Fri Nov 18, 2005 1:35 am Post subject:
Re: balun? |
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Mark-T wrote:
| Quote: |
What is a balun, and what for?
How is it different than any other transformer?
Thanks,
Mark
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Balun = Balanced to Unbalanced. It is used to convert a balanced
line to single ended, or vice versa.
--
?
Michael A. Terrell
Central Florida
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JeffM
Guest
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| Posted:
Fri Nov 18, 2005 9:35 am Post subject:
Re: balun? |
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| Quote: | What is a balun, and what for?
Mark-T
The most common ones have 75 ohm coax on one end |
and 300 ohm flat lead on the other.
..
..
| Quote: | How is it different than any other transformer?
US TV Channel 13 == 216 MHz |
Channel 83 == 890 MHz |
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Paul Burridge
Guest
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| Posted:
Sat Nov 19, 2005 1:35 am Post subject:
Re: balun? |
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On Fri, 18 Nov 2005 00:08:00 GMT, "Bob Myers"
<nospamplease@address.invalid> wrote:
| Quote: |
"Mark-T" <mark-t2@lycos.com> wrote in message
news:1132268403.075151.210000@g14g2000cwa.googlegroups.com...
What is a balun, and what for?
The answer in this case is in the name: a "balun" is a device
for converting between an unbalanced line and a balanced
load, or vice-versa. Hence, BALanced-to-UNbalanced
(transformer, although not all "baluns" are transformer-like
devices - you can make a balun for a given frequency from
the right length of transmission line, f'rinstance). Pretty common
in antenna/transmission line work.
How is it different than any other transformer?
For the transformer type, it's not, really, in the basic
theory of the thing - it's more in how it's connected, and
in practice that generally it is intended for high-frequency,
fairly broadband operation (very high, compared to power
transformers and the like).
|
Indeed. A typical balun would appear as a dead-short to a mains
frequency signal.
--
"What is now proved was once only imagin'd" - William Blake |
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Michael A. Terrell
Guest
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| Posted:
Tue Nov 22, 2005 8:10 am Post subject:
Re: balun? |
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Paul Burridge wrote:
| Quote: |
Indeed. A typical balun would appear as a dead-short to a mains
frequency signal.
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You've never seen a line isolation transformer?
--
?
Michael A. Terrell
Central Florida |
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Mark-T
Guest
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| Posted:
Tue Nov 29, 2005 1:36 am Post subject:
Re: balun? |
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Bob Myers wrote:
| Quote: | What is a balun, and what for?
The answer in this case is in the name: a "balun" is a device
for converting between an unbalanced line and a balanced
load, or vice-versa. Hence, BALanced-to-UNbalanced
(transformer, although not all "baluns" are transformer-like
devices - you can make a balun for a given frequency from
the right length of transmission line, f'rinstance). Pretty common
in antenna/transmission line work.
How is it different than any other transformer?
For the transformer type, it's not, really, in the basic
theory of the thing - it's more in how it's connected, and
in practice that generally it is intended for high-frequency,
fairly broadband operation (very high, compared to power
transformers and the like).
|
So the primary has one side grounded, while the secondary
goes to the inputs of a diff. amp, with center tap to ground?
Mark |
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Bob Myers
Guest
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| Posted:
Tue Nov 29, 2005 1:36 am Post subject:
Re: balun? |
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"Mark-T" <mark-t2@lycos.com> wrote in message
news:1133218949.990365.69950@g14g2000cwa.googlegroups.com...
| Quote: | For the transformer type, it's not, really, in the basic
theory of the thing - it's more in how it's connected, and
in practice that generally it is intended for high-frequency,
fairly broadband operation (very high, compared to power
transformers and the like).
So the primary has one side grounded, while the secondary
goes to the inputs of a diff. amp, with center tap to ground?
|
Why assume a grounded center tap? Better to say that
the primary - or input side - has one end connected to the
"ground" or reference used for the unbalanced output of
whatever you're connecting to, and the output side is
connected to a balanced input - for instance, perhaps it
feeds a dipole antenna. No need for a "ground" at all
on the output side!
Bob M. |
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