Gabe KJ5JOW
BOM for the EFHW build, complete with links to all parts as well as a price/tool breakdown. Total price for all parts with tax/shipping is half ($49) of a comparable ARRL kit, which already has a decent price (~$98 with tax/shipping). Sourcing your own parts is a money saver!
Impedance Matching Transformer
Enclosure (IP65 3x3x2”, $4 Amazon)
Ferrite Core (Mix 43 Fair-Rite 2643251002, $6.70 Digikey)
RTV silicone adhesive (Permatex, $6 Home Depot) OR Zip tie mounts/ties ($.10/ea Amazon)
Winding wire (16-18 AWG enameled copper, ~50in, $1.60 Amazon)
100 pF capacitor 3kV (TDK Ceramic, $.43 Digikey)
SO-239 chassis mount connector (4-hole flange, solder cup bulkhead, $3 Amazon)
IP68 Breather Vent 2x ($6 Amazon)
SS M3 machine screw, Phillips pan head 3×0.5x12mm 4x ($.05/ea Bolt Depot)
SS M3 nut 4x ($.07/ea Bolt Depot)
SS M3 washer 4x ($.05/ea Bolt Depot)
SS M3 tooth lock washer 4x ($.06/ea Bolt Depot) *SS = stainless steel
M3, M5 ring terminal 2x each (Amazon)
SS M5 tap bolt, 5×0.8x25mm 2x ($.23/ea Bolt Depot)
SS M5 wing nut 2x ($.53/ea Bolt Depot)
SS M5 nut 4x ($.07/ea Bolt Depot)
SS M5 washer 4x ($.05/ea Bolt Depot)
SS M5 tooth lock washer 4x ($.06/ea Bolt Depot)
SS M5 split lock washer 4x ($.07/ea Bolt Depot)
SS M6 x 14mm eye bolt with matching nut, flat/lock washers ($1/ea Amazon)
Total ~ $26
Antenna Wire
~69ft 14 AWG stranded copper antenna wire with black PVC jacket ($17 DX Engineering)
SS M4 simplex wire clamp 2x ($0.50/ea Amazon)
End insulator (Alpha Delta, $5/ea DX Engineering)
M5 ring terminal (Amazon)
Heat shrink sleeve for ring terminal (Amazon)
Total ~ $23
Transformer + Antenna Grand Total = $49
Tools Needed
Drill, drill bits (step, ¼ in, 9/64in, 13/64in)
Needle nose pliers
Wire cutter
Sandpaper or sharp knife
Soldering iron/solder
Phillips screwdriver
Safety glasses
Marker
US hardware may be easily substituted for metric, but it must be stainless!