Hi Allison,
The quest was an 80 to 10 Meter Unun. Correct, for 20M and higher
frequency, 61 material can be used with reduced loss. Similar stack of
two FT114-61 with four turn primary, about 2.4uH, will result with
approximately 0.04 dB loss at 14 MHz, as shown in:
John KN5L
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On 6/16/19 12:55 PM, ajparent1/kb1gmx wrote:
For the 14mhz model, try using mu 125 material (FT240-61)
as you getting near the point with hard ferrites (31 and 43)
where their absorption properties are becoming significant.
