A balun is short for "balanced to unbalanced", and refers to a device that converts a balanced signal into an unbalanced one, and vice versa. In amateur radio, a balun is often used to connect an antenna, which is usually tuned, to an unbalanced transmission line, such as a coaxial cable.
There are several types of balun, designed for different applications and antenna configurations. Each type has its own advantages and disadvantages, and choosing the right 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.
Balun 1:1: This type of balun has a transformation ratio of 1:1. This means 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 coaxial cable) without changing the impedance.
Balun 1:4 and 4:1: These baluns have transformation ratios of 1:4 and 4:1, respectively. A 1:4 balun is used to adapt a 50-ohm antenna impedance to a 200-ohm transmission line, while a 4:1 balun does the opposite, adapting a 200-ohm antenna impedance to a 50-ohm transmission line. These baluns are often used with long-wire or V-shaped antennas.
9:1 and 1:9 baluns: These baluns have transformation ratios of 9:1 and 1:9, respectively. A 9:1 balun is used to adapt a 50-ohm antenna impedance to a 450-ohm transmission line, while a 1:9 balun does the opposite. These baluns are often used with non-resonant antennas, such as non-resonant long-wire or T-shaped antennas.
It's important to note that choosing the right balun depends on the antenna impedance and the transmission line you're using. It's also crucial to understand that using a balun with the wrong transformation ratio can result in poor impedance matching, which can reduce the efficiency of your antenna system.
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.
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
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
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
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
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●
Portable 9:1 Balun SDR Balun Antenna SDR Receiver Accessory with 16.5m Red Wire and 10m Blue WireSpecification:- Maximum power: 10W- Red wire: 16.5m- Blue wire: 10m- Weight: 335gPackage Included:- 1 x
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●
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
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
13mm Black Ferrite Choke Balun for EMC Demagnetization Filter Anti-interference Device Clip-on VersionDescription:- It can filter out high-frequency noise pulse interference from connecting wire
7mm Black Ferrite Choke Balun for EMC Demagnetization Filter Anti-interference Device Clip-on VersionDescription:- It can filter out high-frequency noise pulse interference from connecting wire
Stock and shipped from France
14 days to return, 2 warranty
Response within 24h to 72h
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