DIY Antenna feedline common mode choke

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KOA4705
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DIY Antenna feedline common mode choke

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Post by KOA4705 »

Using Amidon FT 240-52 cores. Two chokes in series each using two stacked cores with 5 turns of RG58. The common mode impedance exceeds 10K ohms from 21-30 Mhz. Network analyzer Vertical scale is 2K ohms per division, horizontal scale 1-30 Mhz. Second photo, S21 test setup measuring choke impedance.
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