Test Results for 50 and 75 ohm 1:1 Rod Balun Using R-61-037-300
Measurements taken on Autek VA-1 analyzer - with normal inaccuracies - showing swr.
Windings for 50:50 ohm: 15 turns 1.25mm winding wire bifilar wound, with twine
between bifilar turns.
Windings for 75:75 ohm: 15 turns 1.25mm winding wire bifilar wound with twine
between all turns.
Spacing material: Kinnears 540 TEX colourfil twine; product code K 069048; newsagents, craft suppliers.
| Freq (MHz) |
SWR |
| 50:50 |
75:75 |
| 1.8 |
1.06 |
1.05 |
| 3.55 |
1.06 |
1.04 |
| 5.0 |
1.06 |
1.04 |
| 7.05 |
1.06 |
1.02 |
| 10.1 |
1.06 |
1.01 |
| 14.2 |
1.04 |
1.01 |
| 18.1 |
1.06 |
1.04 |
| 21.2 |
1.04 |
1.04 |
| 28.5 |
1.11 |
1.18 |
23/04/07
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