Does a random wire antenna have to be straight?
Does a random wire antenna have to be straight?
The wire may be straight or it may be strung back and forth between trees or walls just to get enough wire into the air. Such antennas are usually not as effective as antennas whose length is adjusted to resonate at the wavelength to be used.
Should an end fed antenna be grounded?
Since the end fed wire is in the air it still can benefit from an RF ground “plane” underneath the antenna. This RF ground “plane” should be connected to your station “single point ground” and also be connected to your “Electrical” safety ground.
What is the impedance of a random wire antenna?
Impedance is highest on the lowest band. Note it is 6850 ohms on 80 meters, decreasing to 1360 ohms on ten meters. This is because more and more half waves are being fed from one feedpoint with increasing frequency….Counterpoises.
| Advantages | Disadvantages |
|---|---|
| inexpensive | require a tuner or matching system |
What kind of antenna is an end fed antenna?
A so-called random wire antenna is an end fed antenna. As typically installed, it is a compromise antenna but great for portable use because it is easy to pack and easy to install. One end goes straight into the rig, often with no feedline, and the other end in the air attached to something as high as you can find.
What kind of antenna is a random wire?
Random Wire Antenna Lengths Random Wire Antenna Lengths A so-called random wire antenna is an end fed antenna. As typically installed, it is a compromise antenna but great for portable use because it is easy to pack and easy to install.
Can a ladder line antenna work on HF?
You can make this antenna yourself, or buy it premade if you’re short on time. A 130-foot dipole of this type should be usable on almost every HF band. Shorter versions will also work, but you may not be able to load them on every band. Ladder line offers extremely low RF loss on HF frequencies, even when the SWR is relatively high.
Which is better a random wire or an end fed wire?
In the case of the end fed random wire, some lengths are better than others because of the har- monic effect of the length of the wire and how that effects the various bands on which you wish to operate. Counter to tuning a length of wire like you would with a dipole, with a random wire you don’t want the length to be harmonic on anyband.