These FM Radio IF Transformers used to be at Mouser, I bought them.

Maybe have 5 or 6 in a plastic box?

They dropped them now, called obsolete?

So no one must be making FM radios that used these?

I guess you make your own now?

Mike, WA6ISP

On 10/4/2017 6:06 PM, John Backo via Groups.Io wrote:

These are 10 MHz IF filters.
You should be able to find them somewhere, even
in an old FM radio.

Sunil will most likely send you the parts if you let him know.

The BITX parts are IF transformers made in India. They are not the
sturdiest parts in the world, and are prone to breakage.
Warning: Fragile Parts!

Another option is to examine and follow the example
given in the BITX20A documentation, That filter is
built from toroids, caps, and variable caps. It works as
well as anything else.

You can also build your own BPF using any of the many
available online methods.

Or, if you can find them, use the 42IF123 transformers.
They are the best.

Just remember in any event to remove the capacitor across the
windings before you add another cap according to the schematic.

Generally speaking, any transformer with about 5-6 uH on the main
winding and 1-2 uH on the small winding will do.

I have used all the methods in several builds, and the 42IF123 parts are the best, 
followed by a good rendition of the BITX20A method.


john
AD5YE

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