Re: Toroid Ferrite Loop Stick

Everett N4CY

Sorry, but since I don't have a solid ferrite rod that size to compare it to, nor would I want to pay the price such a rod, I can't answer you question. I can tell you that it is much better than the stack toroid rod that I wrote about that using the FT140-61 toroids. 
I was quite surprised at how well it the stacked toroid loop worked compared to 1 meter air loop. I probably will not do any more experiments with this as a receiving loop, as my plan is to experiment with using it as a transmitting loop.  I plan on placing the toroids on a copper pipe, rather than a wood dowel rod, so I can do some cooling. I have been operating a lot of JT65, which allows you to DX with very low power. I bough 46 of the toroids so I can build several ferrite transmit loops. 

I don't know how long the supply of the toroids will last. I think that if you offered the eBay supplier $35 to $40 delivered for 10 toroids he will take the offer. They are not a standard size, but are made by Fair-Rite, whom is a high end manufacture of ferrite. You would normally pay $10 a pice, or more for a toroid like that. The inductance for ten turns of wire on a FT240-61, which is the largest core that Fair-Rite makes in that mix, is 20uH and it weights about 106 gm, the toroids that the eBay seller is offering have a inductance of 36uH and weigh 136 gm.  

Everett N4CY (new call)

On Nov 6, 2015, at 9:47 AM, farmerik@... [ultralightdx] <ultralightdx@...> wrote:


I am impressed with a ferrite loop which compares so well to such a large air core loop. I have followed a number of articles available on line, including yours in the files section of this group about multi coil ferrite antennas. Do you have any conclusions that the stack of hollow ferrites is better than a single huge ferrite, or is it less expensive? - FARMERIK

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