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Transformers for receiving antennas.

Updated: Aug 16

Used material: 73 material Fair-Rite 2873000202


How to build and measure.


1) One core 2 turns left and 3 turns right.

Input = 2 turns / Output = 3 turns

2 square = 4 / 3 square = 9

9 / 4 = 2.25

When Input impedance = 50 Ohm,

Output impedance wil be 2.25 x 50 Ohm = 112.50 Ohm

























2) One core 2 turns left and 3 turns right with 39pF compensation.

























Insertion loss 2 devices:





Loss is approximately 1dB for 2 devices = 0,5 dB/device.


3) Three cores for better low frequency behavior with compensation.













Three cores:

SWR @ 1MHz = 1.04 @2MHz = 1.03 @3MHz = 1.03

One core:

SWR @ 1MHz = 1.12 @2MHz = 1.05 @3MHz = 1.03


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