G5RV Junior 40 through 10 Meter Antenna
The MFJM antenna is a multiband centrefed dipole antenna capable of 1500 Watts. It consists of 52 feet flattop fed with 17 feet of 450 Ohm matching section ending in an SO coax connector.
This antenna generally requires the use of a suitable matching network (antenna tuner) since the SWR of the G5RV JR. is almost certainly not 1:1 on any band. The use of a tuner will guarantee maximum performance from solidstate exciters.
MFJM is a balanced antenna that is fed by an unbalanced coaxial line. This feed system causes unwanted parallel RF currents to appear on the shield of the coaxial feedline.
A choke type balun such as the MFJ should be used with this antenna to eliminate or reduce the undesirable parallel feed line currents. Failure to use a choke balun may result in RFI, RF feedback, or other symptoms of RF “in the shack”.
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