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Topic: Log periodic antenna

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erick@the net - Log Periodic Antenna Design In a nutshell, The log periodic is a broadband antenna whose caracteristics vary as a periodic function of the logarithm of the frequency (with period Log(Tao)). This is a Java applet which calculates the dimensions and spacings of the elements needed to build a log periodic antenna, given tao, sigma and the lower and upper cutoff frequencies. Sigma is a spacing factor, and together with Tao, determine the directivity of the antenna. www.fortunecity.com /skyscraper/jolt/345/LogCalc.html   (122 words)

Log-periodic antenna - Wikipedia, the free encyclopedia In telecommunication, a log-periodic antenna (LP, also known as a log-periodic array) is a broadband, multielement, unidirectional, narrow-beam antenna that has impedance and radiation characteristics that are regularly repetitive as a logarithmic function of the excitation frequency. The length and spacing of the elements of a log-periodic antenna increase logarithmically from one end to the other. Log-periodic antenna signal-gathering action compared to other antenna types. en.wikipedia.org /wiki/Log-periodic_antenna   (104 words)

TSCM Test Equipment - Antenna - Signal Acquisition For a typical log periodic antenna (with 5 dB of gain) this would result in 64 measurement positions for each polarization for a total of 320 positions (assuming horizontal, vertical, diagonal, LHCP, and RHCP polarization). A TSCM antenna is normally operated on a tripod until a spectral anomaly is identified. The antenna being used must be operated in both a horizontal and vertical polarized position, and also in a 45-degree diagonal position for optimal signal detection. www.tscm.com /tmdeantenna.html   (1558 words)

HF Log Periodic Antennas A log periodic antenna requires each element center to be split and insulated from the supporting boom. I tried to modify the antenna element spacing and lengths of traditional log periodic designs and was able to successfully optimize the antenna to give good 14-30 MHz performance without requiring additional passive elements. If you choose to use other software to model log periodic antennas, make sure the software will correctly model the phasing transmission line that runs down the center of the boom and connects each element together. www.realhamradio.com /Log_Periodic.htm   (4180 words)

Alyx Antenna Guide - Fixed Vertical Log-Periodic Antenna for Shortwave Radio Broadcasting The vertical log-periodic antenna is characterised by a radiation pattern that is essentially constant at all frequencies. The vertical log-periodic antenna is designed for direct connection to a 300 ohm balanced open wire feeder or a 50 ohm coaxial line with a balun transformer. The vertically polarized log-periodic dipole antenna has a narrow, low-angle elevation plane pattern, designed for medium and long range communications. www.antenna.be /lpv.html   (123 words)

United States Antenna Products Lineup The Model LP-1019 log periodic antenna has been designed for maximum efficiency and high directive gain as needed for point to point surveillance, ground to air and ground to space communications. The Model LP-1005-CA is the only log periodic of its kind, with unprecedented transmit capability over the full 3 through 30 MHz bandwidth and a 2 through 30 MHz receive capability. In the manual control mode the desired azimuth of the antenna is selected by turning the manual control knob; after a 5 second delay, the rotator is activated and the antenna rotates until it reaches the selected azimuth. www.usantennaproducts.com /antenna_lineup.html   (1604 words)

WiNRADiO AX-31B Planar Log-Periodic Antenna This log-periodic antenna is constructed on a high-quality fibre-glass substrate, with a 20dB amplifier directly mounted on the substrate, together with other surface-mount circuitry and a standard 9V PP3 type battery holder. The AX-31B antenna package includes a 2 meter (6.5 ft) cable with an SMA connector for the antenna and a BNC connector for the receiver. The AX-31B antenna is a compact VHF/UHF directional antenna with an in-built amplifier, which provides a low-cost alternative to conventional VHF/UHF antennas (for example discones), especially for indoor professional and amateur applications. www.winradio.com /home/ax31b.htm   (437 words)

Radio-Electronics.Com :: The log periodic antenna The log periodic antenna is used in a number of applications where a wide bandwidth is required along with directivity and a modest level of gain. The log periodic antenna was originally designed at the University of Illinois in the USA in 1955. The log periodic antenna is a particularly useful design when modest levels of gain are required, combined with wideband operation. www.radio-electronics.com /info/antennas/log_p/log_periodic.php   (916 words)

Log periodic broadband antenna & EMC measurement antenna sweep 380MHz to 10GHz The Log Periodic EMC Antennas of the HyperLOG® series 3000 are identical to the ones of the series 4000. The EMC Log Periodic Antennas of the HyperLOG® series 4000 are almoust identical to the ones of the series 7000. The logarithmic periodical broadband antenna from the series HyperLOG® 7000, represents a quantum leap in capacity, range of functions, and design in their respective price classes. www.emf-meter.com /Antennas.htm   (729 words)

Log Periodic Antennas - Testing, Wireless, Communications and Metrology  - R. A. Mayes company The LPDA-0803 features enhanced gain over standard log periodic dipole antennas (6 dBi at the low end to 8 dBi on the high end) and high power handing capabilities (500W) to accommodate a broad range of both immunity and emissions test requirements. Log Periodic Antennas - Testing, Wireless, Communications and Metrology - R. The RF200 is a calibrated broadband antenna which enables direct measurement of field strength over the full radiated emissions spectrum. www.ramayes.com /log_periodic_antennas.htm   (308 words)

Log Periodic Yagi antenna - Laser guided 2.4 - TechnoLab Inc. This antenna is built for professional use and will help you to point this Log periodic Yagi antenna The antenna and the laser are mounted on a convenient tripod that shows you in 2 degree steps at the time a 180 degree circle that will help you to adjust your antenna if you don't want to go by what the laser shows you The antenna itself is made of resistible PCB board material, no miss- adjustments of the Yagi elements possible www.technolab-inc.com /ppalstore/docs/logper_yagi_laser.htm   (211 words)

TLP-225 225-400 MHz Tactical Log Periodic Antenna The TLP-225 tactical log periodic is designed for use in the 225-400 Mhz frequency band and is capable of handling 400 watts PEP. The antenna is suitable for point-to-point communications or for surveillance applications. The antenna is supplied in a durable carrying bag. www.antennaproducts.com /TLP225DETAIL.htm   (134 words)

Printer Friendly Version The compact antenna design can accomplish this without need of the typical bat-wing log-periodic approach that tends to corrupt the electric (E) field, especially in smaller test enclosures. The company's Radiant Arrow 26 (model AT5026) log-periodic antenna uses a unique folded-element design to shrink the size of the antenna without trimming its bandwidth. Antenna technology does not often benefit from dramatic new developments compared to, for example, semiconductor technology. www.mwrf.com /Articles/Print.cfm?ArticleID=5424   (704 words)

Erecting an Antenna Although the dollar cost of an antenna system is modest, a lot of your time might be required. If you do not need an antenna for over-the-air stations, there is no reason for you to read this section. There is a chance that the first antenna you install will not meet your expectations. www.hdtvprimer.com /ISSUES/erecting_antenna.html   (340 words)

Cushcraft ASL670 log periodic antenna Since the antenna is a log periodic, it offers continuous coverage through the 2 and 6 meter bands as well as 220 and 440 MHz. So while being a terrific antenna for operating those bands, its is also a great aviation and public safety band monitoring antenna. The antenna is compact and easy to assemble and disassemble with no tuning required. www.universal-radio.com /catalog/hamants/4288.html   (119 words)

Cushcraft ASL2010 Skylog log periodic antenna The Cushcraft ASL2010 log periodic antenna is the most cost effective, high gain, five band antenna solution on the market today. Antenna gain and beamwidth are constant for uniform coverage from 10 through 20 meters. All stainless steel hardware and rugged element design are only some of the many features that provide years of superior antenna performance. www.universal-radio.com /catalog/hamants/1540.html   (108 words)

ZAPCHECKER BUG DETECTOR With Log Periodic Antenna - Shomer-Tec Inc. The ZapChecker features electronically-switched antenna selection options between its two internal antennas and its external log periodic antenna. With Log Periodic Antenna" align="left" hspace="5" vspace="5">The ZapChecker can detect and locate even the tiniest of transmitters. It provides three switchable detection modes - linear (for detection from a distance), log (to sort through multiple signal sources), and mid (to home in and pinpoint devices). www.shomer-tec.com /site/product.cfm?id=99887F34-C79F-4E44-752AF13088A7F3EE   (221 words)

Inverted Cone Antenna The LP antenna can be mounted on attached to one end and a heavy alligator clip, or lug, is steel towers or utility poles that incorporate rotating soldered to the other. Figure 2-34 shows a typical LP antenna The simplest emergency antenna consists of a designed for extremely broadbanded, VHF length of wire rope to which a high-voltage insulator is communications. The RLP antenna is commonly used in ship-shore-ship and in point-to-point communications. www.tpub.com /inch/33.htm   (318 words)

MilSpec Communications: MACS Trenton On the left is one of several steerable HF log periodic antennae. At the left, far rear of the picture, is the transmitter building and the microwave tower with the microwave antenna at its top, more steerable log periodics, some dipoles and some HF whip antennae (120 series). Each workstation is capable of controlling receivers, transmitters, antenna switch matrixes, the position steering of the log periodic antennae and other remote receiver/transmitter sites. www.milspec.ca /macs/macs-trenton.html   (330 words)

Log Periodic Stacking Notes To establish a stacking reference, two identical 13 element (14-30 MHz) log periodics were modeled. It is possible to stack antennas without degrading the F/B ratio, but the antennas must be designed from the outset as a dedicated stacked set. This F/B stack degradation is normal with stacked antennas, and often occurs regardless of the antenna type. www.realhamradio.com /Log_Stacking.htm   (252 words)

Wade Antenna Ltd - UHF Log Periodic CATV Receive Antenna Wade Log Periodic antennas were used by the Grand Alliance to develop specifications for Digital TV Receiving antennas. There are two rugged UHF log periodic antenna models. These lightweight, high quality antennas are small in size and big on performance. www.wade-antenna.com /suhf.htm   (90 words)

ipedia.com: Impedance Article For example, a conventional radio frequency antenna for carrying broadcast television in North America was standardized to 300 ohms, using balanced, unshielded, flat wiring. If the applied voltage is periodically changing with a fixed frequency f, according to a sine curve, it is represented as the real part of a function of the form However cable television systems introduced the use of 75 ohm unbalanced, shielded, circular wiring, which could not be plugged into most TV sets of the era. www.ipedia.com /impedance.html   (736 words)

hdtv.forsandiego.com: Small Log Periodic Antenna Besides the two aforementioned antennas, I have tested a Square Shooter, an EMC grade log periodic, an omni-directional, and a couple of home brew antennas. Here is some information about a small log periodic antenna supplied by Ramsey Electronics. I have an aluminum 50-ohm log antenna and had this problem until I made and installed a minimum loss attenuator to match the lines. hdtv.forsandiego.com /messages/1/2944.html   (1164 words)

Log Periodic Antenna Mars Log Periodic Antenna is a ruggedized, true broadband, antenna operating in the 200-1,000 MHZ frequencies. The antenna is aesthetic and designed for use in conditions where rugged construction and wide bandwidth are necessary. Optional mount provides switching between Vertical and Horizontal Polarization. www.mars-antennas.com /logperiodic.htm   (43 words)

Title page for ETD etd-080699-180221 This antenna has smaller transverse dimensions (by a factor of 2/pi) than a log-periodic dipole antenna with comparable radiation characteristics. The Log-Periodic Loop Antenna with Ground Reflector (LPLA-GR) is investigated as a new type of antenna, which provides wide bandwidth, broad beamwidth, and high gain. Three prototype antennas were constructed and measured in the Virginia Tech Antenna Laboratory. scholar.lib.vt.edu /theses/available/etd-080699-180221   (193 words)

Log Periodic Antenna In order to reduce the overall size of the shipping box, the antenna comes totally disassembled. www.schuemperlin.com /pages/logper.htm   (36 words)

KMR05.html Log-periodic antenna in printed circuit form for the frequency range 950-2150 MHz. Design, build, and test a log-periodic, printed antenna to cover the above frequency range. A possible gain of 8dB should be envisaged with an input impedance of 50 Ohms. web.uct.ac.za /depts/ebecourses/eee458s/2000/lists/KMR05.html   (41 words)

Information Bridge: DOE Scientific and Technical Information the log periodic dipole elements of the antenna. ABLE`s approach to meeting the requirements is to use a coilable ABLE mast as the deployable structure ``backbone`` of the antenna and to use deployable tubes for. Demonstration models of the mast and antenna element deployer were fabricated as part of Phase I study. www.osti.gov /bridge/product.biblio.jsp?osti_id=10159103   (294 words)

0003.htm Most of this dialogue is the same as that for the v-log The log periodic antenna comes in many flavors. A 40 element antenna is a total of 80 arms. Depending on the slope from the narrow end to the wide, these antennae can have a frequency response that is greater than 10:1. www.finitesite.com /wetnoodle/0003.htm   (148 words)

United States Antenna Products LP 1017 The LP-1017 is a commercial, lightweight, HF log periodic antenna, designed for medium to long range communications. The antenna is constructed of the finest tubular aluminum available, and all elements are tapered aluminum tubing for minimum weight and wind drag. United States Antenna Products (USAP) manufactures at our Frederick, Maryland plant. www.usantennaproducts.com /products_lp1017.html   (226 words)

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