At 12:52 pm ((PDT)) Mon Jun 18, 2007, timo.nieminen wrote:
Referring to the schema by Chris Trask
I ask for help on the 1:3 transformer.
[Now a 1:2 transformer]
What kind of (Amidon) ferrite
ring core were suitable for the purpose? How many turns? Wound
interleaving or on opposite sides of the core?
This is like asking us how much string you will need
when you won't tell us the size of your parcel ;-)
However, assuming you want your transformer as broadband
as possible, this may help you to 'roll your own'
"A Second Look at Fabricating Impedance Transformers
for Receiving Antennas"
John Bryant with Bill Bowers and Nick Hall-Patch, VE7DXR
DXing.info, July 2003
[Supersedes:
"Fabricating Impedance Transformers for Receiving Antennas"
z_transformers.pdf or impedance_transformer_bryant.doc]
While this gives much more experiment and testing...
"Impedance Matching Transformers for Receiving Antennas
at Medium and Lower Shortwave Frequencies"
Bill Bowers, John Bryant and Nick Hall-Patch, VE7DXR
DXing.info June 29 2003, revised July 24 2003
Regards, LenW
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