Coil-Shortened Vertical Antenna Calculator.
This is for a high-rise unit (about 150ft. A quick SWR check showed it was perfect! and simply disconnecting the pig tail from the screw eye returned the coil to resonance on 40 meters. 10m/20m/40m end fed dipole parts list part no. Compute the approximate antenna length for the center frequency of the range for which you are trimming. When I was first licensed I strung up a half-wave dipole for 10m in my attic. Figure 1 – Folded 40m NVIS Dipole Concept. 5:1(Within Resonant frequency band) Mast diameter accepted:25mm to 62mm Connector:MJ / Type:Trapped dipole Simalar results on 40m. Coil-Shortened Dipole Antenna Calculator. Performance There appears to be little measurable on-the-air difference between this short-ened dipole and a full-sized dipole. Listed under the Antennas/40M/40 meter Dipole Antennas category that is about Dipole antennas for the 7 MHz band. minimum VSWR point occurs too low in frequency, the length of the antenna can be shortened. This is what enables this short antenna (25 Compact Multi-Band Rotatable Dipole Antenna Array Dr.
2 dB less gain than the 66' 1/2WL version. 8Kg weightBalun 1:1 optional 6m kit optional A 40m 1/2w dipole cut for 7.
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