50 or 75 ohm reference for analyzer?
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| Jan 6th 2013, 22:52 | |
KO0YTotal Topics: 0 Total Posts: 0 |
I bought an antenna analyzer to scan my dipole's SWR. It can be set for either 50 or 75 ohm reference impedance. The initial line is 50 ohm LMR-400 coax, but that connects to a 4:1 balun, then 300 ohm twin line to the antenna. 300 divided by 4 is 75, so should I use 75 or 50 as the reference? I get significantly different results when changing. Thanks. |
| Jan 7th 2013, 13:56 | |
W1VTSuper Moderator Total Topics: 0 Total Posts: 0 |
Nearly all modern ham rigs are designed for 50 ohms, so you should use 50 ohms as the reference. Zack Lau W1VT ARRL Senior Lab Engineer |
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