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A typical antenna has a balanced output with 300 ohm impedance, while a coaxial cable is an unbalanced load with 75 ohm impedance. So, an impedance transformer (often called balun) must be used. A balun is a passive device which uses a transformer to change the impedance and character of the output (balanced/unbalanced). Usually, such transformers have standard construction with ferrite core. Some transformers are optimized for working in a particular band, e.g. C0001 for channels 1-12, while baluns working in channels 21-69 are mostly made in the form of flat PCB transformers, such as the C0002 item.
Details
A typical antenna has a balanced output with 300 ohm impedance, while a coaxial cable is an unbalanced load with 75 ohm impedance. So, an impedance transformer (often called balun) must be used. A balun is a passive device which uses a transformer to change the impedance and character of the output (balanced/unbalanced).
Specifications
Product type | Balun | ||
Name | SA IV-V | ||
Impedance | input | Ohm | 300 |
output | Ohm | 75 | |
Loss | dB | < 1.5 | |
Frequency range | MHz | 470 – 790 | |
Operating band | BIV, BV | ||
Channels | 21 – 60 |