A modified version for 20 and 40 meters is described too. It provides no GAIN as compared to other multi-section design. From 80 to 10m. Best of all, it uses commonly available components and materials. The antenna consists of little more than some PVC pipe topped by a RadioShack replacement whip antenna and a couple of coils made from a small roll of 14 house wire. The loading coil is designed as a variable inductor, with a three-legged chariot that travels up and down inside the coil, with grooved brass wheels running on the coil turns, and driven by a slotted rotor tube.
Loading inductors used in mobile HF antennas. He documented the design and construction plans for a portable antenna that can be built with relatively ordinary components [ Hits: Votes: 16 Rating: 7. Ham Radio operators review new sites every day sincefor potential inclusion in the Directory, and to evaluate the best place to list them. Mobile antenna mobile antennas. Operating Modes Operating Aids. CB Radio Antique Radio.
Home : Antennas : Mobile. Radio direction finding. QRP Projects. HF Mobile antenna suppliers. VHF mobile antennas suppliers. Antennas for HF mobile operation The following description should give you guidance on how to build a mobile antenna for HF bands yourself, using a very cheap CB-mobile whip antenna base. Photos andn plan for a 20 meters mobile helix antenna by N2MH. Search only in "Mobile antenna".
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Add a new link. The DXZone is the largest human created and maintained library of web sites dedicated to Amateur Radio, currently lists Add our Daily Top 10 links gadgets to your site.Immune to water, dust and vibration the antenna is engineered to withstand harshest environmental conditions ensuring reliable communications in all types of terrain. Its self-contained construction provides for easy installation on all type of vehicles where larger HF antennas are impractical due to space and traffic rules limitations.
Read more. So you can download it and print it by yourself. Further information How to download etc. The BCH TRBO worldwid Most of the primary features Baofeng DM-5R Read more. Carol F. The radio amateurs have known for a long time that PV installations solar panels could interfere.
Listen…and learn! Using our proven technology it gives continuous frequency coverage It covers all HF bands plus 50 M Posted date: February 19, in: Antenna No Comments. Retevis RT98, the mini mobile radio show August 23, No comments. September 28, No comments. What makes a good portable CW paddle? Recent Posts. Most Shared Posts. New Bright Signs of Cycle Highest-ever resolution images of the Sun unveiled for first time by British Icom IC Icom Inc.For Indoor or Outside field use.
Big signal in a small package. It is a manually tunable antenna. It can form a portable vertical or a mobile whip. Two MP1B units can form a portable rotatable dipole, with a suitable dipole mount. Size: Packs down to 12" 30cm for portability and extends up to 7ft 2. Can be used in vertical or horizontal position.
Easy set up by 1 person in two minutes without tools. Frequency Range: 40mmmmmmm-6m-2m Ham bands. High Q SuperCoil. SuperSlider manually adjusted for Maximum Efficiency. Color: Metallic. Weight: 1 pound 0. It is slightly shorter on other frequencies. This combination is designed to fit indoors in a standard 8 feet floor-to-ceiling American home.
It is 21 inches high when the legs are compressed. The TM2 Large Tripod can also be used when the legs are collapsed down to 21 inches, and this total height to the tip of the antenna is 8 feet 9 inches. Contents: 1 Super Slider Coil. Super Antenna MP1 Configurations for various frequencies of operation.
All rights reserved.All rights reserved. Products and Intellectual Property are protected. Patented and Patent Pending. Super Antenna Systems Corporation is the sole global manufacturing and distribution source for genuine SuperAntenna products. SuperWhip is a mobile whip antenna that is collapsible for travel. It has been discontinued. Super Antenna. Simultaneous HF and 2 meters. All bands 80mm HF 3. Collapses down to pack in the convenient case for travel. Get the power of a Super Antenna.
A big signal in a small package. On Sale. Note: Super Antenna has an Amazon store now. All in one antenna. Extends to 44 inches. Amazingly bends into a 12 inch circle. Fits in the Go Bag. Elevates the top of the MP1 to 12 feet high. Color: Stealth Black on Sale. Vertical or Horizontal. Standard coaxial. Designed for the MP1. Collapses down to 12" for backpacking, EmComm, and travel.
Super Ant enna products can be ordered on Amazon and Amazon Prime.Read more Mobile Mark Engineers have the resources and experience to take an antenna from conception to final production. Our in-house design tools and test facilities ensure that the antennas will meet your expectations.
The narrow footprint on this stylish and compact antenna fits neatly between the ribs. This 3xMIMO omni-directional antenna provides easy set-up and efficient coverage. The antenna offers 7 dBi gain with an omni-directional pattern. The signal can cover a considerable distance while maintaining sufficient vertical beamwidth for effective nearfield coverage.
It is a great choice for Private LTE networks. Rated at watts and 2. Welcome to Mobile Mark — a leading supplier of communication antennas to markets throughout the world, with a well-established track record of offering innovative designs, quality manufacturing, and reliable performance.
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Engineering Mobile Mark Engineers have the resources and experience to take an antenna from conception to final production. Discover More. Read more. Find the Perfect Antenna Solution for your Wireless Networks Welcome to Mobile Mark — a leading supplier of communication antennas to markets throughout the world, with a well-established track record of offering innovative designs, quality manufacturing, and reliable performance.
About Us. Click here for our electronic Comtelco catalog, now a Mobile Mark Brand. Locations Mobile Mark, Inc.We can see this by looking at some basic antennas some distance above earth and away from ground planes or large reflective surfaces.
This antenna has four short radials in the counterpoise, and is. We see the peak gain is 7. We now see gain is 8. This article will walk through the basic antennas to explain how they actually work.
VHF/UHF Mobile Vertical Antennas
A vertical, like any antenna, changes gain as the antenna pattern changes. Removing energy radiated in some directions without adding too much loss will increase radiated field levels in other directions. Compressing the pattern through the addition of nulls concentrates the applied power in a smaller area of space, and that concentration of applied power is what we call "gain". Assuming loss remains about the same, a vertical omnidirectional antenna develops gain through collinear effects.
These collinear effects can come from additional physical in-phase radiating areas in the vertical antenna, from ground reflections, or from both effects. Gain associated with these effects closely follow the theoretical gain of a collinear antenna. In the case of an antenna over highly conductive earth or a flat infinite ground planeeffects of ground plane reflection are analyzed through use of an imaginary "image antenna".
The "image" mirrors the real antenna's current distribution and height, with the reversed image appearing an equal distance below ground level.
This is what causes the "collinear" earth image effect. The graph below, from Jasik's Antenna Engineering Handbook, shows maximum possible collinear theoretical gain, in this case caused by the image:.
If the reflection image is perfect, the theoretical maximum possible gain would be about 1. Elevating the current maxima above ground will increase collinear spacing and increase gain.
If we place the current maxima about 0. These current are lower than the main currents, and are less area, so they have significantly less ampere-feet to cause radiation. The destructive interference at low angles is less than the reinforcement gain, so the overall antenna has gain, albeit less gain than theoretical.Antenna tunermatching networkmatchboxtransmatchantenna tuning unit ATUantenna couplerand feedline coupler are all equivalent names for a device connected between a radio transmitter and its antennato improve power transfer between them by matching the specified load impedance of the radio to the combined input impedance of the feedline and the antenna.
Antenna tuners are particularly important for use with transmitters. If the impedance seen by the transmitter departs from the design load, circuits in modern transmitters automatically cut back the power output to protect the equipment from the consequences of the impedance mismatch. In addition to reducing the power radiated by the antenna, the mismatch can distort the signal, and in high power transmitters may overheat the transmitter. Because of this, ATUs are a standard part of almost all radio transmitting systems.
They may be a circuit incorporated into the transmitter itself, or a separate piece of equipment connected between the transmitter and the antenna. In transmitting systems with an antenna separated from the transmitter and connected to it by a transmission line feedlinethere may be yet another matching network or ATU where the feedline connects to the antenna, to match the transmission line's impedance to the antenna. Transmitters in cell phones and walkie-talkies have an ATU circuit inside permanently set to work with the installed antenna.
Matching the transmitter, feedline, antenna, or their environment by adjustment of the ATU is an important procedure done after any change the system, with an instrument called an SWR meter typically used to measure the degree of match or mismatch. Antenna tuners are used almost universally with transmitters. Without an ATU, in addition to reducing the power radiated by the antenna, the reflected current can overheat transformer cores and cause signal distortion.
In high-power transmitters it may overheat the transmitter's output amplifier.
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When reflected power is detected, self-protection circuits in modern transmitters automatically reduce power to safe levels, hence reduce the power of the signal leaving the antenna even further.
They may be a circuit incorporated into the transmitter itself, [a] or a separate piece of equipment connected between the transmitter and the antenna. In transmitting systems with an antenna separated from the transmitter and connected to it by a transmission line feedlinethere may be another matching network or ATU at the antenna that matches the transmission line's impedance to the antenna.
High power transmitters like radio broadcasting stations have a matching unit that is adjustable to accommodate changes in the frequency, the transmitter, the antenna, or the antenna's environment. Adjusting the ATU to match the transmitter to the antenna is an important procedure which is done after any work on the transmitter or antenna occurs.
Despite its name, an antenna "tuner" does not actually tune the antenna. It matches the complex impedance of the transmitter to that of the input end of the feedline. The input impedance of the transmission line will be different than the characteristic impedance of the feedline if the impedance of the antenna on the other end of the line does not match the line's characteristic impedance.
The consequence of the mismatch is that the line's impedance voltage to current ratio and phase will oscillate along the line, or equivalently, raise out-of-phase voltage standing waves and current standing waves along the feedline. If both the tuner and the feedline were lossless, tuning at the transmitter end would indeed produce a perfect match at every point in the transmitter-feedline-antenna system.
If the loss of power is low in the line carrying the transmitter's signal to the antenna, a tuner at the transmitter end can produce a worthwhile degree of matching and tuning for the antenna and feedline network as a whole. In any case, regardless of its placement, an ATU does not alter the gain, efficiency, or directivity of the antenna, nor does it change the internal complex impedance of the antenna itself.
If there is still a high standing wave ratio SWR in the feedline beyond the ATU, any loss in that part of the feedline is typically increased by the transmitted waves reflecting back and forth between the tuner and the antenna, causing resistive losses in the wires and possibly the insulation of the transmission line.
Even with a matching unit at both ends of the feedline — the near ATU matching the transmitter to the feedline and the remote ATU matching the feedline to the antenna — losses in the circuitry of the two ATUs will slightly reduce power delivered to the antenna. Hence, operating an antenna far from its design frequency and compensating with an ATU between the transmitter and the feedline is not as efficient as using a resonant antenna with a matched-impedance feedline, nor as efficient as a matched feedline from the transmitter to a remote antenna tuner attached directly to the antenna.
ATUs are not widely used in shortwave receivers, and almost never used in mediumwave or longwave receivers. In a receiver, if the complex impedance of the antenna is not a conjugate match for the complex input impedance at the antenna end of the transmission line, then some of the incoming signal power will be reflected back out to the antenna and will not reach the receiver.
However this is only important for frequencies at and above the middle HF band. Therefore, the receiver can amplify the weak signal to compensate for any inefficiency caused by impedance mismatch without perceptibly increasing noise in the output. At higher frequencies, however, receivers encounter very little atmospheric noise and noise added by the receiver's own front end amplifier dominates the signal to noise ratio.
So impedance-matching circuits are incorporated in some receivers for the upper HF bandsuch as CB radioand for most VHF and higher frequency receivers, such as FM broadcast receivers, and scanners for aircraft and public safety radio.
Transformersautotransformersand baluns are sometimes incorporated into the design of narrow band antenna tuners and antenna cabling connections.
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