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Measurments on Kenwood YK-88CN CW Narrow filter.
Updated: Jan 1, 2021
Input / output impedance = 600 Ohms

Measuring setup:

Transformer impedance ratio = 600 / 50 = 12
I have ended with 3 turns / 10 turns.




Insertion loss measurement of the setup showed 0.5 dB witch is negligible.
The results:


