Toroid core Fair-Rite 2643251002 mix 43
for End Fed Half Wave EFHW antennas HAM radio
included 1 TDK 3kv 100pf capacitor
Brand: Fair-Rite manufacturer part 2643251002
Weight: 104 (g)
ID 0.660" Dia (16.76mm)
OD 1.540" Dia (39.12mm)
Length 0.875" (22.23mm)
This Ferrite toroid core is to be used in EFHW antennas transformers. Capable of supporting on peak up to 400w SSB, 250CW and 100w Data. Recommended Power on continuous TX: 100w SSB, 50w CW and 30w FT8 / FT4, they can handle more power than the known FT24043 and they are more power efficient, resulting in delivering more power to your radiant element. You might want to output more power and I don't find it problematic as long as you use 16awg wire or thicker. If you wind the transformer correctly you will get approx. 90 to 93% efficiency from a EFHW broad band transformer on 80m-10m bands. You need to use high quality TDK 100pf capacitor. I will include 1 in the package.
SWR ~1.1 - 1.4 depending on the band and turns configuration. Tip, placing the transformer closer to the floor might lower the SWR.
Check youtube videos on how to build your transformer to maximum efficiency, your experience might vary and get better results on 49:1 - 56:1 - 64:1 configuration, spread or tight turns spacing, band of interest, length of wire, length of counterpoise.
Since those toroids are demanded for experimenting, I will not accept returns.
Check my other items, I also have few FT240-43 from FAIR RITE for sale.