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A typical antenna has a balanced output of 300 Ohm impedance ratio, while a coaxial cable is an imbalanced load of 75 Ohm impedance. This is why an indirect connection must be created to fit an antenna with a coaxial cable: an impedance transformer must be used. An impedance transformer is a passive device which uses a transformer to change the impedance, and switch between balanced and imbalanced load.
Details
A typical antenna has a balanced output of 300 Ohm impedance, while a coaxial cable is an imbalanced load of 75 Ohm impedance. This is why an indirect connection must be created to fit such an antenna with a coaxial cable.
An impedance transformer, popularly called "balun", is a passive device which uses a transformer to change the impedance and configuration - from balanced to unbalanced.
An impedance transformer, popularly called "balun", is a passive device which uses a transformer to change the impedance and configuration - from balanced to unbalanced.
Specifications
Product type | Balun | ||
Name | SA I-V "F” connector | ||
Impedance | input | Ohm | 300 |
Impedance | output | Ohm | 75 |
Loss | dB | < 1.5 | |
Frequency range | MHz | 48 – 790 | |
Operating band | BI, BII/FM, BIII/VHF. BIV, BV | ||
Channels | 1 – 60 |