Showing results: 16 - 30 of 33 items found.
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TDK RF Solutions Inc.
TDK Log Periodic Antennas - v-log array, log periodic dipole antenna, precision log periodic antenna, etc
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Schwarzbeck Mess Elektronik
Linear polarized half-wave dipole with 1:1 balun and fixed element length for fieldstrength measurements at TETRA (terrestrical trunked radio) networks.
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A.H.Systems, Inc.
Broadband antennas, compared to half wave dipoles, reduce test time because the technician did not have to stop the test to adjust the dipole antenna for each frequency. Most compliance standards now require the use of such antennas. The latest version of Mil-Std 461E states the used of broadband double ridge guide horn antenna as the antenna of choice for frequencies above 200 MHz.
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Res2dinv -
PASI srl
This very popular software, developped by M.H.Loke, uses the method involving the Sasaki minimum squares inversion (1992) to produce a 2D sub-soil model starting from the data of apparent resistivity (up to 2000 electrodes). It is completely automatic and does not require that the user formulates a starting model. When using a state-of-art computer, the inversion of a single pseudosection will require only a few minutes.RES2DINV supports spreading types like Wenner, Schlumberger, Pole-Pole, Pole-Dipole, line Dipole, equatorial Dipole and other non-conventional spreading types.
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A.H.Systems, Inc.
For many years most standards called for the use of a half-wave dipole antenna set for frequencies above 80 MHz. However, to reduce test time, broadband antennas such as the biconical antenna and log periodic antennas began to be accepted. Broadband antennas, compared to half wave dipoles, reduce test time because the technician did not have to stop the test to adjust the dipole antenna for each frequency. A.H. Systems'' 7 models of Biconical Antennas operate efficiently over the frequency range of 20 MHz to 18 GHz. Suitable for FCC, MIL-STD, VDE, TEMPEST, and immunity testing, each Biconical antenna will provide reliable, repeatable measurements.
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Type NRD -
National RF, Inc
Reference antennas are precision dipole antennas that offer a fixed 2.15 dB of gain over an isotropic antenna along the major lobe axis at specified frequencies (2.15 dBi). They are intended to be used for antenna field pattern and gain measurements, or general RF sensing in the laboratory.
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Schwarzbeck Mess Elektronik
Biconical Antennas have dipole like characteristics (e.g. circular directional pattern in the H-plane,"8"-shaped in the E-plane, fixed phase center, comparable gain), with an enormous wide bandwidth achieved by the double cone elements. One of the earliest and worldwide most popular biconical antenna designs is the BBA 9106 with balun VHA 9103 B. During the last years a growing need for expanded frequency ranges arised, which led to the design of biconical antennas reaching down to frequencies of 20 MHz and up to 18 GHz and above. A further increase of bandwidth was achieved with qualified 4:1 baluns, providing a typical gain increase of approx. 6 dB at the lower frequency range. The biconical elements can be mounted and dismounted within a few seconds providing perfect contact repeatability thanks to special clamping fixtures. A small wrench made of insulating material is supplied with the balun, it is tied to the balun head and thus always available whenever needed. Biconical antennas can be used for many applications, in which half-wave dipoles have been used traditionally. An enormous reduction of measurement time can be achieved, because the time consuming tuning of the antenna elements to the half wavelength is not needed, an important condition for sweeped broadband measurements. In typical dipole applications several discrete frequencies are measured, in contrast the biconical antenna allows continuous sweeps, where site anomalies are discovered much easier.
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WGMD-10X/V 5/10 Channels -
Langeo Co., Ltd.
WGMD-10X/V Multi-channel 2D/3D electrical resistivity/IP tomogrpahy system is developed basing on years'experience of studying and manufacturing advanced electrical resistivity instruments. It support up to 16 kinds of electrode arrays as wenner array, sclumberger array, dipole-dipole array, cross-hole dipole array and so on, which is widly applys for different geophysical exploration as underground water insepection, metal source detction, landslide investigation and so on.
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ALP690 -
Lectrosonics, Inc.
The ALP690 is a high-performance LPDA (log periodic dipole array) antenna with a bypassable, built-in RF amplifier for use with wireless microphone receivers in location or studio production. The design delivers +4 dBd of passive gain in a directional pattern to extend operating range, and, when DC power is applied, the amplifier applies gain to overcome loss in long coaxial cable runs. By offering both active and passive operation modes, the ALP690 can be used as a receiver antenna (active or passive) and as a transmitter antenna (passive only).
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EM-6947 | 200 MHz – 5 GHz -
Electro-Metrics Corp.
The EM-6947 is an ultra-wide bandwidth log periodic dipole array aimed at applications requiring consistent performance over a very wide frequency range. Capable of both receiving and moderate power level transmitting, the EM-6947 can take the place of two or more conventional antennas, allowing you to take full advantage of the tuning range capabilities of modern receiver and spectrum analyzer designs with less inconvenience caused by the need to switch antennas.
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CMD-DUO -
GF Instruments, s.r.o.
CMD-DUO electromagnetic conductivity meter completes our family of advanced digital conductivity meters with the instrument for deep surveys. Easy operated set with variable dipole distance allows multidepth field survey with results suitable both for apparent conductivity and model sections (inversion by IX1D). geological survey, water management (searching for potable water sources, groundwater protection, ground contamination monitoring), raw material prospecting, investigation of underground objects.
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Stacked LPDA -
Schwarzbeck Mess Elektronik
The stacked Logarithmic Periodic Dipole Antenna consists of two ordinary Log.-Per. structures. The excellent characteristics (flat gain over a large bandwidth, low SWR) of the ordinary Log.-Per. designs could be maintained using the stacked LP design. The stacked design helps to focus the directional pattern of the H-plane somewhat, resulting in a typical gain improvement of ca. 2-3 dB compared to an ordinary LPDA. This is especially important for immunity testing, where a maximum fieldstrength and a good field uniformity is required. The beamwidth in the E-plane and the H-plane are nearly identical, providing an optimised illumination of the EuT with minimised ground reflection influence. Further the STLP 9128 C has an excellent cross-polar rejection.
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PMK -
ART-Fi SAS
Test labs have a daily requirement to ensure SAR measurements are highly accurate. SAR systems must be vigorously checked to ensure the measuring accuracy meets the system manufacturer uncertainty budget. The PMK features technologies usually found in more expensive equipment at an affordable price. The ability to measure the S11 parameter for dipoles and antennas while continuously monitoring their linear behaviour differentiates the PMK from other systems. The ART-Fi PMK is an all-in-one solution that requires only three connections to perform automatic, highly precise validations and verifications. The lack of moving parts also leads to improved durability and fewer bugs, faults, and workarounds.
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AEROMARITIME Systembau GmbH
The multifunctional antennas are designed to meet the harsh environmental conditions and limited space availability found on submarines. This is achieved by utilizing a unique stack array enclosed within a protecting fibre glass dome.The antenna characteristics has been developed in such a way so that aircrafts can also operate in the airspace for data and voice communications next to ship-to-ship or ship-to-shore communications. In this way aircrafts e.g. AWACS act as relay stations to transfer radio signals. Although the dipole of the lizard has a primarily plane oriented radiation characteristic – up until an elevation angle of 60 degrees-, submarines can still track aircrafts up to an elevation angle of 90 degree. This guarantees complete coverage of the surrounding airspace in 360 degree horizontal level as well as in 180 degree vertical level.With this outstanding multifunction antenna capability Aeromaritime significantly extends the military communications for submarines by offering this unique capability.
