calculated impedance for 136 uH choke

calculated impedance for 136 uH choke

This choke's inductance was measured using an AADE L/C IIB to be 136 uH. Using the formula Z = 2*pi*L*f,...

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Uploaded on Sep 20, 2010

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insert SO-239 "wrong side in" to help with drilling holes for #4-40 bolts

insert SO-239 "wrong side in" to help with drilling holes for #4-40 bolts

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Uploaded on Sep 19, 2010

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interior view

interior view

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Uploaded on Sep 19, 2010

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the perfect fit

the perfect fit

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Uploaded on Sep 19, 2010

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sizing it up

sizing it up

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Uploaded on Sep 19, 2010

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how much more should I trim?

how much more should I trim?

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Uploaded on Sep 19, 2010

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first trim

first trim

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Uploaded on Sep 19, 2010

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bolt holes drilled for #4-40 hardware

bolt holes drilled for #4-40 hardware

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Uploaded on Sep 19, 2010

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final product! continuity checks out okay, too

final product! continuity checks out okay, too

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Uploaded on Sep 19, 2010

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enamel scraped and wires prepared

enamel scraped and wires prepared

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Uploaded on Sep 19, 2010

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preparing to drill the box for SO-239

preparing to drill the box for SO-239

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Uploaded on Sep 19, 2010

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FT240-43 wrapped in Scotch #27 tape

FT240-43 wrapped in Scotch #27 tape

This helps prevent nicking of the bifilar wire and allows for more "grip" between the wire and the core.

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Uploaded on Sep 19, 2010

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completely wound

completely wound

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Uploaded on Sep 19, 2010

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halfway there, and then the crossover

halfway there, and then the crossover

Crossover technique allows for the input and output to be at opposite sides of the core, without having to...

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Uploaded on Sep 19, 2010

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tools of the trade

tools of the trade

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Uploaded on Sep 19, 2010

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preparing for the first winding

preparing for the first winding

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Uploaded on Sep 19, 2010

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shot with extra length (I used 33", but could have gotten away with less)

shot with extra length (I used 33", but could have gotten away with less)

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Uploaded on Sep 19, 2010

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Panavise holding the pair of #14 AWG wires for binding

Panavise holding the pair of #14 AWG wires for binding

One wire has been covered in Scotch #92 polyimide film to help bring the impedance of the bifilar winding...

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Uploaded on Sep 19, 2010

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