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Links http://www.arrl.org/qex/Mueller.pdf http://www.seed-solutions.com/gregordy/Amateur%20Radio/Experimentation/CoaxTrap.htm http://www.zerobeat.net/G4FGQ/page3.html http://www.qsl.net/ve6yp/index.html Her er programmet til beregning af coax-traps http://www.qsl.net/ve6yp/coaxtrap.zip eller her KLIK |
20 - 40 - 80 m dipole using coax traps
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5,6 m 2,9m 5m Feed 5m 2,9m 5,6 m
These aprox. lengths where used with feedpoint at 6m height.
At 11m height aprox 1m has to be added at the (80m)ends
Using RG58CU you can use the table below.
| Freq | Form Ø | Turns | Turn Sens kHz/cm | End Sens kHz/cm. | L in uH |
| 7,1Mhz | 30mm | 14.9 | 50kHz/cm. | 21kHz/cm. | 3uH |
| 14.2MHz | 30mm | 8 | 193kHz/cm. | 77kHz/cm. | 1,4uH |
| 7,1Mhz | 40mm | 10.9 | 54.7kHz/cm. | 22.4kHz/cm. | 3,1uH |
| 14.2MHz | 40mm | 6 | 206.7kHz/cm. | 80kHz/cm. | 1,4uH |
| 7,1Mhz | 50mm | 8.6 | 58kHz/cm. | 23kHz/cm. | 3,2uH |
| 14.2MHz | 50mm | 4,8 | 214khz/cm. | 80kHz/cm. | 1.4uH |
| 7,1Mhz | 75mm | 5,8 | 62kHz/cm. | 23kHz/cm. | 3,3uH |
| 14.2MHz | 75mm | 3,4 | 219kHz/cm | 78kHz/cm. | 1,4uH |