[600MRG] FT-37-WC toroid

[Brian Pease]

I have an old Amidon catalog. W material has u=10,000, loss factor of 
7E-6 at 10KHz, useful in resonant circuits 1kHz-250kHz and wideband 
1KHz-1MHz.

I have been using a DigiKey coated toroid as a transformer in a 2200m 
project, part 240-2524-ND. It is larger, 0.54" dia, with u=5000. Cost is 
$1.02 each or $7.10/10. I originally bought them to use as a transformer 
in an AMRAD VPA project years ago, where they worked.  The DigiKey 
datasheet link is broken, but does take you to the manufacturers site, 
which is Laird.


On 11/20/2024 9:00 AM, Paul N1BUG FN55mf wrote:
> Hey folks,
>
> I am experimenting with MF and LF again.
>
> I'm trying to source a few FT-37-WC toroids. They are .375 inch or
> 9.53mm OD, W material, epoxy coated. The only reference to such a part I
> can find is Amidon. Of course FT-37-WC would not be what the
> manufacturer calls these. Amidon prices and minimum order are currently
> prohibitive. I would like to get the exact part if possible since I have
> tested and know they work well in my application. Failing that I would
> try a substitute, but I am unable to find permeability for "W" material.
> Can anyone help unravel what these are, who makes them, possible
> substitutes or sources in very small quantity?
>
> 73,
> Paul N1BUG
>
> ______________________________________________________________
> 600MRG mailing list
> Home: http://mailman.qth.net/mailman/listinfo/600mrg
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:600MRG at mailman.qth.net
>
> This list hosted by: https://www.qsl.net
> Please help support this email list: https://www.qsl.net/donate.html