450Ω vs 600Ω ladder linr to feed loop antenna using 4:1 Balun
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| Apr 17th 2017, 18:36 | |
WA2FTVTotal Topics: 0 Total Posts: 0 |
Hello Everyone, I reside in an apartment (courtyard style) with no access to outside (i.e. no balcony). I am considering installing a large loop antenna and feeding it with either 450Ω or 600Ω ladder line from a 4:1 balun. This in turn would be fed by an antenna tuner. Other than losses, is there any advantage of 450Ω or 600Ω ladderline? Please advise. Thank You and 73s Cedric WA2FTV |
| Apr 21st 2017, 12:10 | |
W1VTSuper Moderator Total Topics: 0 Total Posts: 0 |
No, the only advantage of using 450 ohm ladder line is lower losses. Typically there aren't any matching issues using 50 coax. Nor is there a particular common mode advantage, as loop itself often provides a degree of common mode rejection. In order to provide a lot of common mode rejection, two cores are typically required. Many designs use only one to cut costs, sacrificing common mode performance. Zack Lau W1VT ARRL Senior Lab Engineer |
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