Toroid 2643251002

£7.50

(Inc. Tax)

£6.25

(Ex. Tax)

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SKU:: 2643251002
Shipping:: Calculated at Checkout

Description
Reviews

Toroid 2643251002

Ferrite Toroid, type 43 material. This model of toroid has been found by various hams to be a good choice for ununs for EFHW antennas, for an average power of up to about 40-50W.

For QRP use, you might like to consider a 2643625002 toroid instead (smaller, lighter and cheaper than this toroid).

Outside Diameter= 1.54 in / 39.1 mm +/- 0.75 mm
Inside Diameter = 0.66 in / 16.75 mm +/- 0.50 mm
Height = 0.875 in / 22.2 mm +/- 0.80 mm

References:

"Building an UNUN for an EFHW Antenna" article by Mike Dunstan G8GYW, in Practical Wireless October 2023
https://owenduffy.net/blog/?p=21901 , https://owenduffy.net/blog/?p=23089 , plus various other articles that can be found by searching for 2643251002 on Owen's website

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5
2643251002 Toroid

Posted by Doug Hanson G8KOM on 31st Oct 2024

90% efficient for end fed halfwave antenna tested with a Nano VNA & Rig Expert.