Inductors Introduction

General

In this phase, the builder undertakes the most tedious part of the build, the winding, installation, and testing of the 4 coils and the transformer.

Note that, while the schematic calls for a L5 coil, this has been eliminated as not needed/used in the 6m, 4m, and the 2m versions.

The inductors are band-specific items and their values and turn counts will depend on which version of the converter you are building (6m, 4m, or 2m). In the installation tasks below, the band-specific items are separated out into band-specific "Bill of Material" (BOM) pages for your convnience.

The inductors are tested for continuity following installation, using points on the board physically removed from the actual solder joints of the inductor's leads, but still electrically connected via the board traces.

Remember, when winding toroidal inductors, a single pass through the core counts as 1 turn. You might want to review Leonard KC0WOX's excellent 10-minute video on winding toroidal coils and transformers.

Also, please refer to the common component mounting instructions for toroids

Inductors Schematic

(Resistor testpoints (hairpin, top, or left-hand lead), as physically installed on the board, are marked in the schematic with red dots)

(Click for Full Schematic)

Inductors Bill of Materials

Stage Bill of Materials

(resistor images and color codes courtesy of WIlfried, DL5SWB's R-Color Code program)

Check	Designation	Component	Marking	Category	Orientation	Notes	Circuit
❏	L1	band-specific		misc			Inductors
❏	L2	band-specific		misc			Inductors
❏	L3	band-specific		misc			Inductors
❏	L4	band-specific		misc			Inductors
❏	L5	band-specific		misc		L5 is unused in current design	Inductors
❏	T1	band-specific		misc			Inductors
❏	T25-12	T25-12 toroid core	green	toroid			Inductors
❏	T25-6	T25-6 toroid core	yellow	toroid			Inductors
❏	wire26	#26 magnet wire		wire			Inductors
❏	wire30	#30 magnet wire		wire			Inductors

Band Specific Items for 6m Band

Check	Designation	Component	Marking	Category	Orientation	Notes	Circuit
❏	L1	0.35uH 11T #26 on T25-6(yellow) (7")	yellow	coil			Inductors
❏	L2	0.35uH 11T #26 on T25-6(yellow) (7")	yellow	coil			Inductors
❏	L3	0.35uH 11T #26 on T25-6(yellow) (7")	yellow	coil			Inductors
❏	L4	0.78uH 17T #30 on T25-6(yellow) (9")	yellow	coil			Inductors
❏	T1	0.53 uH 14T/2x7 bifilar #30 on T25-6(yellow) (8")	yellow	transformer			Inductors

Band Specific Items for 4m Band

Check	Designation	Component	Marking	Category	Orientation	Notes	Circuit
❏	L1	0.22uH 9T #26 on T25-6(yellow) (7")	yellow	coil			Inductors
❏	L2	0.22uH 9T #26 on T25-6(yellow) (7")	yellow	coil			Inductors
❏	L3	0.22uH 9T #26 on T25-6(yellow) (7")	yellow	coil			Inductors
❏	L4	0.53 uH 14T #30 on T25-6 (10")	yellow	coil			Inductors
❏	T1	0.13uH 7T/2x4 bifilar #30 on T25-6(yellow) (6")	yellow	transformer			Inductors

Band Specific Items for 2m Band

Check	Designation	Component	Marking	Category	Orientation	Notes	Circuit
❏	L1	0.08uH 6T #26 on T25-12(green) (5")	green	coil			Inductors
❏	L2	0.06 5T #26 on T25-12(green) (4")	green	coil			Inductors
❏	L3	0.06 5T #26 on T25-12(green) (4")	green	coil			Inductors
❏	L4	0.53 uH 14T #30 on T25-6 (10")	yellow	coil			Inductors
❏	T1	0.13uH 7T/2x4 bifilar #30 on T25-6(yellow) (6")	yellow	transformer			Inductors

Inductors Summary Build Notes

• Wind and Install Coils
• Wind and Install Transformer
• Test the Stage

Inductors Detailed Build Notes

Top of the Board

Inductors Testing

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