Good wire for wire antenna? - Amateur Radio Stack Exchange
In any place were the National Electric Code (NEC), that is used in much of the United States, is enforced as law the minimum size of wire that can be used for an amateur radio transmitting antenna is number fourteen American Wire Gauge (14AWG). For people in other parts of the world that is equivalent to 1.63mm diameter or 2.08 square mm.
End-fed wire antenna lengths - Amateur Radio Stack Exchange
Jan 19, 2017 · The Antenna Tuner will load an End Fed Long Wire effectively, especially if it is cut to aprox. an Odd Quarter Wave-Length of your target band... 186 ft / 16.5 ft and 186 ft / 33 ft... The entire antenna is #12 stranded insulated copper. The Antenna Tuner is a 1977 HeathKit HFT-9, a small QRP size tuner of the Cap-Coil-Cap double"L" design.
Is there a simple, DIY, antenna suitable for HF receive only?
They work best when the antenna is at least a quarter wavelength at the lowest operating frequency, 65' for 80m, for instance. To maximize the effectiveness, and have something useful down the line, you could build a small tuner. An L-network random wire tuner is probably the simplest matching network in existence, designs about on the net.
Most effective placement of receive-only long wire antenna?
Jun 11, 2015 · If the antenna is sloped upwards towards the end of wire, chances are it works as an effective backbeam. Ie. It receives signals better from opposite direction. This can be enhanced by dropping wire vertically over the branch to the ground . That flat height is ideal for antenna that is purposed to receive as well from front and back.
Is copper-clad steel a good material for wire antennas?
4. Copper clad steel is a good antenna wire. It's not the best for every application, but it's good for most applications. The advantages it has are: Doesn't stretch as much as copper and other good conductors (which changes the resonant frequency)
Effect of different metals for antenna elements
A lower resistivity means you will need less of a metal to reduce the resistance to an acceptable target. Here's a selection, ordered from lowest to highest resistivity in nano-ohm-meters (nΩm), of some metals you might consider using in an antenna: Silver: 15.9. Copper: 16.8. Gold: 24.4. Aluminium: 26.2. Zinc: 59.0.
antenna - EFHW: better to get far end really high, or middle …
Aug 8, 2021 · I built a 40m end fed halfwave antenna and unun, and the wire is about 66 ft long. I have some tall trees nearby I can hang it in, semi-permanently. Which of the following would be better? A) hanging the far end nice and high, about 50ft, …
cut or lengthen to reduce swr on vertical wire antenna
Jul 26, 2022 · Mount the antenna in its final location as the SWR and resonant frequency will change a bit depending on the environment. Because cutting is permanent, I recommend first extending the wire by 5% of its length, perhaps with a bit of aluminium foil and tape, or for lower frequencies and larger antennas, a crocodile clip lead.
Gain in long wire antennas - Amateur Radio Stack Exchange
Jan 3, 2018 · I suggest you model this in EZNEC or another antenna modeling program. A 1 wavelength long wire has a 2.75 dBi free space gain, 2 wavelengths is 4.75 dBi and 4 wavelengths is 6.75 dBi. I don't have the formulas at the top of my head to support this data. I am referencing Figure 1 in Chapter 13 of the 20th edition of the ARRL Antenna Book.
How to best ditch the counterpoise of a random wire antenna?
May 14, 2022 · 1. An end fed isn’t really an end fed, but a highly off center fed, off center fed dipole. The place where a 9:1 or 49:1 transformer balun matches the off center impedance isn’t at the very end, but close to the end. Thus the need for a short counterpoise (so 5 to 15% of the antenna is on the other side of the transformer/balun) to optimize ...