balunn.

Brit.

/ˈbalʌn/,

/ˈbalən/, U.S.

/ˈbæl(ˌ)ən/

Origin: Formed within English, by shortening. Etymon: English balancing unit.

Etymology: Shortened < balancing unit (compare quot. 1947²) < balancing adj. + unit n.In later use perhaps reinterpreted as < balanced adj. (or balance n.¹) + unbalanced adj. (or unbalance n.).

Electronics and Telecommunications.

A device that converts between balanced and unbalanced electrical signals, esp. from an unbalanced coaxial cable to a balanced antenna.

ΚΠ

1947 J. A. Nelson & G. Stavis in H. J. Reich Very High-frequency Techniques I. iii. 86 Since antennas are almost always fed by coaxial lines, there is a need for a device to convert the unbalanced voltage of the coaxial cable to the balanced voltage required by the antenna. This balance-to-unbalance transformer is commonly called a balun.

1947 F. E. Terman Radio Engin. (ed. 3) xiv. 690 At frequencies high enough so that resonant lines are practical, the arrangements of Figs. 14-28c and 14-28d are employed. These are often termed baluns (short for balancing units).

1975 Which? Sept. 279/1 If you need to convert from a 300 ohm socket to a 75 ohm aerial, you'd have to spend about £2 on a balun transformer.

1992 RS Components: Electronic & Electr. Products July 312/3 The double cableless baluns are able to connect two IBM 3278-like terminals over a single IBM cabling system data cable.

2013 B. Henderson & E. Camargo Microwave Mixer Technol. & Applic. iv. 170 This balun is narrow band due to its dependence on differences in transmission line lengths.

This is a new entry (OED Third Edition, December 2020; most recently modified version published online December 2021).

单词	balun
释义	balunn. Brit. /ˈbalʌn/, /ˈbalən/, U.S. /ˈbæl(ˌ)ən/ Origin: Formed within English, by shortening. Etymon: English balancing unit. Etymology: Shortened < balancing unit (compare quot. 1947²) < balancing adj. + unit n.In later use perhaps reinterpreted as < balanced adj. (or balance n.¹) + unbalanced adj. (or unbalance n.). Electronics and Telecommunications. A device that converts between balanced and unbalanced electrical signals, esp. from an unbalanced coaxial cable to a balanced antenna. ΚΠ 1947 J. A. Nelson & G. Stavis in H. J. Reich Very High-frequency Techniques I. iii. 86 Since antennas are almost always fed by coaxial lines, there is a need for a device to convert the unbalanced voltage of the coaxial cable to the balanced voltage required by the antenna. This balance-to-unbalance transformer is commonly called a balun. 1947 F. E. Terman Radio Engin. (ed. 3) xiv. 690 At frequencies high enough so that resonant lines are practical, the arrangements of Figs. 14-28c and 14-28d are employed. These are often termed baluns (short for balancing units). 1975 Which? Sept. 279/1 If you need to convert from a 300 ohm socket to a 75 ohm aerial, you'd have to spend about £2 on a balun transformer. 1992 RS Components: Electronic & Electr. Products July 312/3 The double cableless baluns are able to connect two IBM 3278-like terminals over a single IBM cabling system data cable. 2013 B. Henderson & E. Camargo Microwave Mixer Technol. & Applic. iv. 170 This balun is narrow band due to its dependence on differences in transmission line lengths. This is a new entry (OED Third Edition, December 2020; most recently modified version published online December 2021). < n.1947
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