Let’s consider the simplest case of two signal waveforms arriving at a receiving antenna. The electric field voltages are summed by the receiving antenna, so the well-aligned waves produce a combined signal on the antenna that is about twice as strong as either signal alone. This high amplitude produces a relatively strong signal at the receiving antenna. Signals arriving at the receiving antenna with a polarization identical to the antenna’s polarization

Before the satellite pass occurs, set up your equipment (HT and directional antenna) and envision the More about antennas and tracking in a moment after we consider some features of satellite orbits. Directional antennas for providing gain may be homebrewed or commercially obtained. My favorite satellite antennas are manufactured by Arrow Antenna of Cheyenne, Wyoming. Check out these fine designs and create your own satellite antenna.

Put a different way, using SSB instead of FM can be equivalent to having a beam antenna with 10 dB of I had just dismantled my 2m yagi antenna and was listening to 2M SSB on a short mobile whip antenna. antennas. If you can get a horizontal antenna, then your results will be much better. There are a variety of horizontally-polarized, omni-directional mobile antennas, such as the HO antenna

Antennas! HRS: That's very true, especially for HF antennas! VHF antennas are not usually that big of a barrier. Typically, VHF/UHF HT antennas and mobile antennas that may be magnetic or clip mounting on a vehicle We have quite a collection of articles about antennas .

A key concept for antennas is the concept of resonance. Let’s extend this concept to feeding antennas. largely by the antenna’s physical length. With a longer antenna the charges need a longer time to travel the full extent of the antenna’s length Note that for any given antenna there is a single resonant frequency, but an antenna will typically operate

A 6-meter beam is an antenna for the 6-meter radio band, and a beam antenna is one that provides improved transmission and reception in one direction – also called a directional antenna. In this case, the Yagi directional antenna is for the 2-meter band. So, Elroy has a little antenna project going today, installing two new directional antennas. If a ham has a number of antennas in the air at his station, it is commonly referred to as an antenna

It has an integrated microphone and speaker, an attached antenna that can be easily removed and replaced or clip-mounted antennas are quite simple to implement and can provide good performance. An external antenna is most commonly implemented with a base station, typically mounted on a mast or A wide variety of antenna types are feasible with the base station, including directional antennas that boost signal strength (provide gain) in the pointing direction of the antenna.

A horizontally polarized antenna provides the best NVIS propagation. Horizontal full-wave loop antennas are also very effective. is the antenna’s height above ground. Antenna models reported by Jack Swinden W5JCK (and based on work of L.B. such an antenna.

The feed-point is the position at which the feed line attached to an antenna. of the antenna feed-point and the impedance of the feed line are equal. Such antenna mismatches drive up the Standing Wave Ratio (SWR) of your antenna system, SWR being a ratio SWR low and to keep our antenna’s radiating performance high. Imagine the antenna is a long, narrow tank of water.

of antennas. for the HF band antenna(s). VHF/UHF Antenna: With any antenna a higher mounting position is generally better for performance. metal mass ‘under’ the antenna is better, with solid electrical continuity between the antenna ground I’ll address the routing of coaxial cable for the VHF/UHF antenna along with that of the HF antenna in

Coaxial Cables: The Diamond K412S antenna mount that I utilized for the VHF/UHF dual band antenna is HF Antenna Tuner: I suspected that the shortened and coil-loaded HF antennas would exhibit a 2:1 (or Once I began to use an antenna analyzer to evaluate the SWR functions of my HF antenna system with the Remember, every antenna is a compromise, in this case a very convenient antenna with reduced performance Mini-Antenna Results: The SWR curves with the mini-antennas are shown below also.

impedance match: T7C04: What reading on an SWR meter indicates a perfect impedance match between the antenna Full Scale The standing wave ratio (SWR) is a measure of how well a load, such as an antenna, is matched to a transmission line, such as your antenna system coaxial feedline. To have a good impedance match the impedance of the antenna and the impedance of the feedline must be Thus, a typical goal is to have an antenna feedpoint at which the impedance is also near 50 ohms.