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10 mar 2020 · Construction. Building the doublet is pretty simple. Many folks suggest making the doublet a half-wavelength long at the lowest band you intend to use. I’ve built one for 40M and it worked well on 40M and higher.
Wire antennas are probably the first choice for portable use on the shortwave amateur radio bands. I will show you on this webpage how to calculate a Doublet antenna tailored for several bands. Each doublet antenna consists of 2 radiator halves and a two-wire cable.
Details and construction. The all band doublet antenna is nothing more than a 1/2 wave dipole cut for your lowest operating frequency and fed with twinlead, ladder line, open wire, etc to a tuner that will accept a balanced line connection. IT IS NOT FED WITH COAX!
80 Meter Doublet Antenna Construction. by: M. G. Salak, KC9Q. Figure 1. Figure 1 shows the basic doublet antenna design using 450 ohm ladder line to a remote 4:1 Current Balun; a short coax jumper to go into the house (shack); then connecting to an antenna tuner.
11 lut 2019 · If your main interest is DX, the 80 meter doublet is not a good DX antenna. You should consider a multi-band vertical on that 7th floor roof, if roof is large enough to lay out several quarter-wave radials. Another good choice might be the Cobweb antenna, which is small, horizontal, omni-directional, without nulls.
5 sty 2021 · A Doublet antenna is simply a wire antenna consisting of two antenna arms of equal length and fed with ladder-line. The Antenna portion of the doublet could be resonant or non-resonant on the ham-bands.
Particularly on 75 meters, getting a good match across the band can be impossible with a conventional half wave dipole fed with coax. For years the handbook has shown the 130 foot center fed "doublet", using open wire line to be a recommended multiband antenna.
