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.

Distance from the antenna to a person C. Radiation pattern of the antenna D. , a mag-mount car antenna, or even a cookie-sheet mounting antenna inside your house up on a bookshelf The distance of a human from the radiating antenna significantly affects exposure. The gain of an antenna can also impact exposure. Reference Chapter 7, Antennas, to learn how directional or “beam” antennas direct most of the radiated

VHF/UHF vertical antenna: You’ll need to install an antenna that covers the 2M and 70 cm bands. a compromise installation such as an antenna in the attic. Some popular antennas are the Comet GP-3, Cushcraft AR-270 and Diamond X-50A. Your antenna system should be grounded for lightning protection. Antenna grounding is a complex subject, so see this paper for much more information.

Do I need a different antenna that the one this HT is sold with? ...and many others. Similarly, a base station involves a coaxial cable run, power supply, external antenna erecting, and Get an Extended Antenna HTs are sold with a short, rubberized exterior antenna affectionately known as Be sure to pay attention to the antenna connector type and polarity required by your HT. a stable mount for the antenna.

We must consider that another operator with another antenna at some height above the ground is going Let’s say the other operator also has an antenna six feet high. must add together the radio horizon distance of both antennas. So the true antenna height difference with Pikes Peak is only a little over 10,000 feet. (All omnidirectional vertical antennas – radiating equally in all horizontal directions.)

The safety questions in the 2022-2026 Technician License question pool asks about touching an antenna during transmission: T0C07: What hazard is created by touching an antenna during a transmission? All these choices are correct Touching an antenna while transmitting with it is never a good idea. Antennas are not the only hazardous element with RF burn potential. This is the power output at the antenna where the contact is made.

vehicle-emitted RFI via your antenna. for your mobile vertical antenna. Magnetic mounted antennas will frequently result in poor grounding continuity for the antenna, so performance mass (ground plane) below the antenna as possible. This will generally improve your antenna performance.

/70cm transmit, wideband receive, memories, scanning, CTCSS, DTMF, built-in battery and rubber duck antenna No doubt an HT is handy, but it is a “pipsqueak” of a radio…5 watts output power and a compromised antenna Upgrade the antenna on your HT. If you are operating inside a car, use an external antenna on the roof. 4.

the tradeoff is that an HT operates with relatively low power (5 watts or less) and has a compromised antenna (The standard rubber duck antenna on an HT is a very convenient crummy antenna.) You may need to add some extra umph to your signal by improving the antenna. choices are a longer whip such as the Diamond RH77CA, SRH77CA, or SRJ77CA or a magnetic-mount mobile antenna

In fact, that little coil that you see in some dual band VHF/UHF antennas is an inductor acting as a filter: For instance, the antenna choke does not allow higher frequency 70cm band signals to pass further up the antenna length and so it effectively shortens the antenna to a resonant length for the 70cm band allowed to pass along relatively unimpeded by the coil so they resonate along the entire length of the antenna

Coaxial cables are the most popular form of transmission line for getting our signals to and from our antennas This loss applies to both transmit and receive… we’ll get less power out to the antenna and we’ll have