What is co phasing antennas?
Co-phasing involves placing two (or more!) identical antennas either side-by-side or one over top another (“stacking”) at a certain distance apart (usually a 1/2 Wavelength or more) and feeding the antennas in-phase. The result is 3 db more than just a single antenna.
How far apart do Yagi antennas need to be?
When using multiple yagis, they should ideally be mounted at least 10 ft apart and not pointed at each other to prevent any interference. Then use a signal splitter to combine the two antennas into one cable that can be attached to the amplifier.
What is meant by co phasing?
In astronomy, the term cophasing or phasing describes the process of controlling the individual segments in a segmented mirror or a telescope so that the segments form a larger composite mirroring surface.
Is it better to have 2 CB antennas?
That’s when having two antennas comes in handy. With antennas on both sides of your vehicle, you’re much less likely to have large dead spots because the antenna system can “see” more. This is one of the primary reasons most 18 wheelers have dual antenna setups.
Do dual CB antennas work better?
On average, dual CB antennas are a better choice for truckers because they: Reduce signal blind spots caused by your own trailer and other obstacles on the road. Increase your range in front and behind your truck at the cost of a shorter range on either side.
Do Yagi antennas need line of sight?
Yagi antennas are best used in line-of- sight radio systems because Yagis focus the radio signal in a specific direction. Most dipole omni antennas have a minimum distance for optimum signal reception.
How far apart must LTE antennas be spaced?
In theory, one wavelength of separation should be sufficient, but it depends on the environment and the amount of signal scattering. Current LTE operator guidelines for spatial separation are on the order of 2 to 3 wavelengths, or 2’7” to 3’11” at 750MHz.
What does 42 mean on CB?
CB Radio Code and Lingo at CB World
| CB Terminology | Meaning or Translation |
|---|---|
| FM | An AM/FM radio. |
| 42 | Yes, or OK. |
| Four-Letter Word | Nobody wants to stop at the weigh station- that is why “OPEN” is considered a four-letter word in the trucking industry. When the weigh station is open. |
| Four Wheeler | Any passenger vehicle with four wheels. |
How do I increase the range on my CB radio?
There are several procedures for ensuring maximum output.
- TUNE THE RADIO. A CB radio is only as good as the coax and antenna connected to it.
- USE CB-SPECIFIC ANTENNAS.
- ESTABLISH A GROUND PLANE.
- CHECK THE VSWR.
- ELIMINATE RESISTANCE.
What’s the minimum distance for stacking two Yagi antennas?
The minimum clearance distance (for antennas on lower bands, same polarization) is one-half of the stacking distance for two of the same antennas. Example: The manufacturer recommends that you stack two identical 144MHz yagis 10 feet apart.
Which is the best antenna for co-phasing?
The only antennas I could really recommend co-phasing are beams with 3 or more elements. The work involved is serious, and with other antennas, there are simpler solutions to stacking. Why co-phase antennas then? Well, co-phasing beams with 3 or more elements results in seriously high-gain.
How big should the spacing be between co phased antennas?
Most text books say that the spacing between co-phased antennas should be at least 1 wavelength (36 feet!). But in practice at 27MHz, we see that stacking at 36 feet is tough. The rules go like this, for higher gain antennas larger stacking distances are needed to realize the full 3 db gain increase.
Is the horn antenna the same as the Yagi antenna?
For example, if we built a giant horn antenna with the same gain and beamwidth as the yagi that we’re viewing head-on in the diagram below, the front aperture of the horn would be the same as the effective aperture of the yagi. The effective aperture of a yagi is roughly elliptical, with its longer axis along the length of the elements.