Baluns

A balun is short for "balanced to unbalanced" and refers to a device that converts a balanced line into an unbalanced one, and vice versa.

In amateur radio, it is used to connect an antenna, which is usually balanced (tuned), to an unbalanced transmission line, such as a coaxial cable.

A balanced line is a two-wire line with no ground connection, while an unbalanced line, like a coaxial cable, has one of its conductors connected to ground.

It also blocks sheath currents.

The balun must be protected against weather, humidity and water ingress.

It also blocks sheath currents, which can cause interference in radio communication systems.

Duct currents can sometimes be strong enough to damage radio equipment.

Balun types

Each type has its own advantages and disadvantages, and the choice of the appropriate balun will depend on the specific application.

Numbers such as 1/1, 1/4, 4/1, 1/9, 9/1 refer to the balun's transformation ratio. This ratio indicates the relationship between antenna impedance and transmission line impedance.

  •     1:1: A transformation ratio of 1:1 means that there is no change in impedance between the antenna and the transmission line. It is generally used to connect a balanced antenna (such as a dipole antenna) to an unbalanced transmission line (such as a coaxial cable) without changing the impedance.

  •     1:4 and 4:1: Transformation ratios of 1/4 and 4/1, respectively. The 1:4 is used to match a 50-ohm antenna impedance to a 200-ohm transmission line, while a 4:1 balun does the opposite, matching a 200-ohm antenna impedance to a 50-ohm transmission line. Often used with long-wire or V-shaped antennas.

  •     9:1 and 1:9: Transformation ratios of 9/1 and 1/9, respectively. The 9:1 is used to adapt a 50-ohm antenna impedance to a 450-ohm transmission line, while a 1:9 balun does the opposite. Often used with non-resonant antennas, such as long non-resonant wire or T-shaped antennas.
Showing 1 - 17 of 17 items
  • 5000W Balun 1:1 5000W PEP PST-5KW for wired dipole ProSisTel
    87,95 €

    Reference: PST-5KW-2533

    5000W Balun 1:1 5000W PEP PST-5KW for wired dipole ProSisTel

    Features :Balun 1:1, 5 KW pep, ferrite core, suitable for wired dipoles Bandwidth 1-30Mhz SO239 Complete with connection cable

    87,95 €
  • Balun PST-5KY 5000W Balun 1:1 5000W PEP for YAGI & rotating dipole
    84,21 €

    Reference: PST-5KY-2534

    5000W Balun 1:1 5000W PEP PST-5KY for YAGI & rotary dipole ProSisTel

    Features :Balun 1: 1 5 KW pep, ferrite core, suitable for rotary dipoles and yagi Bandwidth: 1-30Mhz SO239 Complete with connection wires, jumper

    84,21 €
  • Balun 1:1 1500W PEP PST-1.5KW for wired dipole ProSisTel
    59,16 €

    Reference: PST-1-5KW-2532

    Balun 1:1 1500W PEP PST-1.5KW for wired dipole ProSisTel

    Characteristic :Balun 1:1, 1.5 KW pep, ferrite core, suitable for wired dipoles Bandwidth 1-60Mhz SO239 Complete with connection cable

    59,16 €
  • Balun HF 4:1 QRO M0CVO 1.8-54Mhz 1kW
    59,15 € 62,27 € tax excl. -5%tax excl. In stock

    -5%

    Reference: M0CVO-41QRO-1883

    Balun 4:1 HF QRO 1.8 to 54Mhz 1kW M0CVO

    Balun 4:1 QRO for very high power M0CVO Antennas for Windom antennas, dipoles, fed loops or folded off centre. RF power of 1kW, for intermittent amateur use and not for continuous AM broadcast use.

    59,15 €

    62,27 €

    Reduced price!
  • Balun HF 1:1 QRO M0CVO 1.8-54Mhz 1kW (CW) 1.2kW (PEP)
    59,15 € 62,27 € tax excl. -5%tax excl. Out of stock, available within 2 to 3 months

    -5%

    Reference: M0CVO-11QRO-1886

    Balun HF 1:1 QRO M0CVO 1.8-54Mhz 1kW (CW) 1.2kW (PEP)

    The 1:1 M0CVO very high power RF balun of 1kW (CW) and 1.2kW (PEP)*. It is used to adapt a balanced antenna, such as a dipole, to an unbalanced feed such as a coaxial cable. It also reduces the amount

    59,15 €

    62,27 €

    Reduced price!
  • Balun 1:1 1500W PEP PST-1,5KY for YAGI antenna & rotating dipole ProSisTel
    52,77 €

    Reference: PST-1-5KY-2531

    Balun 1:1 1500W PEP PST-1,5KY for YAGI antenna & rotating dipole ProSisTel

    Features :1:1 balun on ferrite rod, suitable for rotary dipoles and yagi Maximum power: 1.5Kw SWR: 1.1 1-52Mhz SO239 Complete with connection wires, jumper.

    52,77 €
  • Balun HF 9:1 UNUN M0CVO 1,8-54Mhz 400W (CW) 500W (PEP)
    37,92 € 39,92 € tax excl. -5%tax excl. In stock

    -5%

    Reference: M0CVO-91UNUN-1882

    Balun HF 9:1 UNUN M0CVO 1,8-54Mhz 400W (CW) 500W (PEP)

    The M0CVO 9:1 UNUN Balun operates from 1.8 to 54MHz and supports up to 400W CW or 500W PEP in SSB. It provides a power point for a long-wire radiating element and converts the 450Ω (+/-) impedance to

    37,92 €

    39,92 €

    Reduced price!
  • HF Balun 4:1 M0CVO 1.8-54Mhz 400W (CW) 500W (PEP)
    36,34 € 38,25 € tax excl. -5%tax excl. In stock

    -5%

    Reference: M0CVO-41BALUN-1879

    Balun 4:1M0CVO HF 1.8-54Mhz 400W (CW) 500W (PEP)

    The M0CVO high power 4:1 Balun operates from 1.8 to 54MHz. It supports up to 400W CW or 500W PEP in SSB. It is used to convert the 200Ω impedance seen at the feed point of a bent or off-centre fed

    36,34 €

    38,25 €

    Reduced price!
  • Balun HF 1:1 M0CVO 1,8-30Mhz 400W (CW) 450W (PEP)
    36,34 € 38,25 € tax excl. -5%tax excl. In stock

    -5%

    Reference: M0CVO-11BALUN-1878

    Balun 1:1 M0CVO HF 1.8 to 30MHz 450W PEP

    The M0CVO high power 1:1 Balun operates from 1.8 to 30MHz. It can handle up to 400W CW or 450W PEP in SSB. It is used to match a balanced antenna, such as a dipole, to an unbalanced feed such as

    36,34 €

    38,25 €

    Reduced price!
  • Balun 1:1 HF 1.7Mhz à 40Mhz Diamond BU50 Diamond Antenna Mounting bracket DIAMOND-BU50-517
    29,16 € 30,69 € tax excl. -5%tax excl. In stock

    -5%

    Reference: DIAMOND-BU50A-517

    Balun 1:1 HF 1.7Mhz à 40Mhz Diamond BU50/A

    Diamond BU50/A balun 1:1, genuine, operates from 1.7 to 40Mhz and allows to receive and transmit on HF bands.Technical data sheet of the HF BU50A balun:● Operating frequency from 1.7 to 40MHz●

    29,16 €

    30,69 €

    Reduced price!
  • Balun One Nine v2 HF 9:1 Nooelec with aluminium housing and multiple connection options
    25,65 € 27,00 € tax excl. -5%tax excl. In stock

    -5%

    Reference: NOO-100806-BALUN-ONENINEV2-2538

    Balun One Nine v2 HF 9:1 Nooelec with aluminium housing

    Small 9:1 balun/unun (38 mm x 25.0 mm) designed to connect long wires and HF dipole antennas to your SDR HF radio, radio or Ham It Up HF upconverter. Assembled in a bespoke aluminium housing, it

    25,65 €

    27,00 €

    Online only Reduced price!
  • 40m to 10m HF wire antenna with 9:1 10W balun
    22,90 € 24,10 € tax excl. -5%tax excl. In stock

    -5%

    Reference: RFKONNECT-ANTENNE-81T403-2191

    40m to 10m HF wire antenna with 9:1 10W balun

    Balun portable 9:1 Antenna Balun SDR Receiver Accessory with 16.5m red wire and 10m blue wireSpecification:- Maximum power: 10W- Red wire: 16.5m- Blue wire: 10m- Weight: 335gIncluded in the package:-

    22,90 €

    24,10 €

    Reduced price!
  • Balun 1:1 HF+6M from 3 to 75Mhz Diamond BU55 Diamond Antenna Long Wire DIAMOND-BU55-538
    22,09 € 23,25 € tax excl. -5%tax excl. In stock

    -5%

    Reference: DIAMOND-BU55-538

    Balun 1:1 HF+6M from 3 to 75Mhz Diamond BU55

    Genuine Diamond BU55 balun 1:1, operates from 3 to 75Mhz, allows to receive and transmit on HF bands + 6 meters (50Mhz).Technical data sheet of the HF BU55 balun:● Operating frequency from 3 to 75MHz●

    22,09 €

    23,25 €

    Reduced price!
  • Nooelec Balun 1:9 V2 for HF SDR reception 0-30Mhz Nooelec SDR accessory NOO-100814-BALUN2-907
    19,23 € 20,24 € tax excl. -5%tax excl. In stock

    -5%

    Reference: NOO-100814-BALUN2-907

    Nooelec Balun 1:9 V2 for HF SDR reception 0-30Mhz

    The new version Nooelec Balun 1:9 v2 allows to add a wired or dipole antenna type to listen HF bands from 0 to 30Mhz from the Ham It Up converter, an SDRPlay receiver or equivalent covering the HF

    19,23 €

    20,24 €

    Online only Reduced price!
  • HF Antenna Balun 1:9 for SDR Nooelec SDR accessory NOOELEC-100652-BALUN-HF-298
    14,93 € 15,72 € tax excl. -5%tax excl. In stock

    -5%

    Reference: NOOELEC-100652-BALUN-HF-298

    HF Antenna Balun 1:9 for SDR

    This balun is the perfect accessory to connect a long wire antenna, for example with the converter HF SDR Ham it Up to listen shortwave and HF bands from 0.5 to 30Mhz, but this balun can work up to

    14,93 €

    15,72 €

    Online only Reduced price!
  • 13 mm ferrite for balun choke and interference suppression
    2,28 € 2,40 € tax excl. -5%tax excl. In stock

    -5%

    Reference: RFKONNECT-FERR13MM-81T606-2216

    13 mm ferrite for balun choke and interference suppression

    13mm Black Ferrite Choke Balun for EMC Demagnetization Filter Anti-interference Device Clip-on VersionDescription:- It can filter high frequency noise, pulse interference from connection circuits.-

    2,28 €

    2,40 €

    Reduced price!
  • 7 mm ferrite for balun and interference suppression
    1,52 € 1,60 € tax excl. -5%tax excl. In stock

    -5%

    Reference: RFKONNECT-FERR7MM-81T607-2217

    7 mm ferrite for balun and interference suppression

    7mm Black Ferrite Choke Balun for EMC Demagnetization Filter Anti-interference Device Clip-on VersionDescription:- It can filter high frequency noise, pulse interference from connection circuits.-

    1,52 €

    1,60 €

    Reduced price!
Showing 1 - 17 of 17 items

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