Frank Dinger wrote:

Yes it is definitely a core T82-75 from the labeling on the package.
Which parameter specifies that it has low resistivity?
Can this be used as a transmission line transformer of a balanced mixer?

Which ferrite material works well for the AM band around 1 MHz?

I can get core #43, 61, and 63.


Thanks for the input folks.

I wouldn't use ferrite at all for this application. A suitable iron
powder core would be a lot better:

=================================
Am I getting confused ? I thought the designation T82-75 identifies a
powder iron toroid , having a 0.82 inch outer diameter and is made of 75
type (mix)of material.
If ferrite it would be labelled FT82-75.


The OP said it was ferrite. Assuming he is referring to an Amidon
product 75 is a ferrite mix:

MATERIAL ' J '/75 ( µ = 5000 ) Low volume resistivity and low core loss
from 1 KHZ to 1MHz. Used for pulse transformers and low level wide band
transformers. Excellent frequency attenuation from 0.5 MHZ to 20 MHz.
Available in toroidal form and ferrite beads as standard off the shelf
in stock. Also available in pot cores, RM cores, E & U cores as custom
ordered parts with lead time for delivery.

I'd say this was quite unsuitable for his purpose. It would be OK for a
wide-band transformer, as he suggests.

Leon
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Leon Heller, G1HSM
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