Specifications

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3.3.5.3 Dipoles with Matching Lines
Some antennas, such as the G5RV, use a section of ladder line as a
matching device. These transform the impedance of feed point to
something near 50 ohms. Usually, the ladder line terminates in a
1:1 balun. The Coaxial line from the transceiver connects to the
balun. The MAC-200 can feed this connection directly from one of
the coax ports or you can remove the balun run the ladder line
directly to the MAC-200 balanced feed line port.