Miniature Antenna UNUN or BALUN Transformer for Receivers

Choose from 1:1, 2:1, 4:1, 9:1, 16:1, 25:1 and 36:1 impedance ratios – NEW: 49:1 Added wound on a FT50-43 ferrite core working from 3.5-21 MHZ
With a Gas Plasma Discharge Tube for overvoltage protection

​The PCB dimensions are only 41 x 19 mm and its material is a durable 1.6 mm thick FR4, gold plated.
For permanent installations, one can use a small plastic or metal enclosure to fully protect the module.
Now, depending on the antenna used, you may need a different impedance ratio from a receiver BALUN.
For example, loop antennae may need 2:1, another antenna type 2:1 or 4:1 and for long wires 9:1 or better, 16:1.

You can directly connect the 50 Ohms port to a receiver or through a preamp (LNA)

The following configutrations are available:

1:1 Using the ADTT1-6+ transformer, working from 15 KHZ – 100 MHZ (-3 dB points).
2:1 Using the T2-1T-KK81+ transformer, working from 70 KHZ – 200 MHZ (-3 dB points).
4:1 Using the T4-6T-KK81+ transformer, working from 20 KHZ – 250 MHZ (-3 dB points).
9:1 Using the TX9-1+ transformer, working from 1 MHZ – 200 MHZ (-3 dB points).
16:1 Using the T16-6T-KK81+ transformer, working from 30 KHZ – 75 MHZ (-3 dB points).
25:1 Using the TT25-1-KK81+ transformer, working from 20 KHZ – 30 MHZ (-3 dB points).
36:1 Using the T36-1-KK81+ transformer, working from 30 KHZ – 20 MHZ (-3 dB points).
49:1 Using a wound FT50-43 ferrite core, working from 3.5 MHZ – 20 MHZ

Ordering: Please send us an email to tell us which ratio you need and which PCB (Green for BALUN and Red for UNUN). The BALUN PCB can be easily modified to make an UNUN by simply grounding one of the wires in the BALanced side. The UNUN PCB can be modified to a BALUN by cutting the ground connection of the grounding wire at the BALanced side.