40m Doublet Antenna. To give a sense of what the radiation patterns look like, her

To give a sense of what the radiation patterns look like, here are sample plots of a doublet with a length of 40m ( 131 feet) installed at a height of Fig. Figure The overall length of the antenna is 76' (22' for each doublet leg plus 54' of feedline) so this antenna should be easy to tune on 10, 15, 20, and 40m. The NorCal Doublet Antenna came about due to my desire for a simple antenna that could be erected very fast, only needed one center support, Reviews For: W7FG Tuned Doublet Antenna Category: Antennas: HF: Verticals; Wire; Loop eMail Subscription Registered users are allowed to subscribe to specific review topics and RCA Double Doublet antenna is a multiband wire antenna designed for operation from 40 meters to 12 meters. The doublet definitely works but I wouldn’t say it is a great DX antenna at that height. No wonder G3RWF Doublet –40m antenna wire only 18m apex & slopes to 15m – base line of dipole impedances The MMANA-GAL model results shown that the resistance alternates between low and high values, The Doublet Antenna is a very versatile concept. It opens up all kinds of possibilities and variations. Ideally it should be fed from a balanced “tuner” to keep the electrical loses to a minimum. 1 shows in the simplest possible sketch the dimensions of a 40-meter doublet. qsl. I was recently going through my stash of portable wire antennas and came across one of my old favorites—the doublet. Here, Peter G3OJV, gives some pointers in creating y The Importance – or Not – of Antenna Resonance last updated 28 February 2025. Here's how. It's a variant of a doublet antenna, typically a full wavelength or more on its lowest band, and I’m still comparing my 40m doublet at around 15m up with a 20m vertical dipole with a feedpoint at about ~30ft. The doublet is a very versatile antenna that can be used in a variety of configurations. Co A double doublet antenna enables 80 meters and 40 meters to coexist on the same antenna system without interfering with each other. Doublet Antenna for 80-10M DOUBLET 80-10M Used by G3RWF Half Size Doublet 40m-10m 51 ft (16m) 450 Ohm G3RWF used approx 60ft used of 450 ohm ladder-line, but 300 ohm ladder-line or open My previous Linear Loaded shortened dipole for 40 metres works well but is mono-band for 40 only. I don't see too many The NorCal Doublet Antenna came about due to my desire for a simple antenna that could be erected very fast, only needed one center support, RCA Double Doublet antenna is a multiband wire antenna designed for operation from 40 meters to 12 meters. Here, Peter G3OJC, shows the re 17 — Delta Fed Dipole Antenna 18 — Bow-Tie Dipole Antenna 19 — Bow-Tie Folded Dipole Antenna for RX 20 — Multiband Tuned Doublet Antenna 21 — Fortunately there is one antenna that can provide effective communication on all, or near all, HF bands: the multiband tuned doublet an-tenna—or, as it is often called, the center-fed Zepp (Note 1). Here is a demonstration of how a short Doublet Antenna can be made to cover frequency bands much lower than you might expect. The benefit of The doublet has a long history and its longevity is perhaps down to two factors: ease of construction and its being an effective multi-band radiator. One often encounters articles and comments about the Wire Antennas for Ham Radio I ulian Rosu YO3DAC / VA3IUL, http://www. net/va3iul Note: Dimensions of the antennas presented below are So does anyone have a suggestion for a lightweight, horizontal wire antenna that doesn’t take more space than a 40m dipole while not being Reviews For: W7FG Tuned Doublet Antenna Category: Antennas: HF: Verticals; Wire; Loop eMail Subscription Registered users are allowed to subscribe to specific review topics and receive eMail Free Shipping - Kelemen Double-Band 80M & 40M Dipoles with qualifying orders of $99. The term “doublet” is often applied to symmetrical center-fed antennas that are not resonant or that are used on multiple bands to distinguish them from the resonant center-fed dipole. Each doublet antenna consists of 2 radiator halves and a two-wire cable. Why not try this idea? A short doublet for 40m and above. . In fact, in the following performance In this video I will show a DIY 40m Doublet that is perfect for SOTA/POTA with Radios with internal tuners capable of 10:1 tuning. Also great I will show you on this webpage how to calculate a Doublet antenna tailored for several bands. Shop Wire Antennas at DX Engineering. The length can be varied by plus or minus a few feet without affecting performance.

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