Showing results: 31 - 40 of 40 items found.
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Vivaldi -
DVTest Inc.
The dbDIRECT Broadband Antenna features a broad frequency range of operation, high gain, small form factor and directional radiation pattern, making it highly attractive for widespread use in test and measurement of emerging wireless technology devices and radars. Contrary to conventional Vivaldi antennas limited to operating only at higher frequencies, the dbDIRECT Broadband Antenna design is optimized to operate at a frequency as low as 700 MHz up to 6 GHz. This lightweight and compact antenna design provides excellent matching over a broad frequency range.The antenna is designed to be placed in a DVTEST's portable anechoic chamber such as the dbSAFE enclosures for OTA (Over the Air) testing of DUTs. The antennas can be mounted in fixed positions to facilitate repeatable results. When used in conjunction with a rotary positioning mechanism, customers are able to detect the highest point of power sensitivity for enhanced accuracy and repeatability in measurements. In this configuration, both the antennas and DUTs can be positioned in order to facilitate the measurement.
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Site VSWR -
Seibersdorf Labor GmbH
The Site VSWR measurement is done according to CISPR 16-1-4 in the frequency range from 1 GHz to 18 GHz using broadband omni directional antennas in horizontal and vertical polarisation. The volumetric test method is applied (test volume needs to be specified), test distance 3 m - any other distance upon request. The ground plane has to be covered with absorbing material.
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Type NVF-2 -
National RF, Inc
The Type NVF-2 series of handheld directional antennas are used to locate interfering signals or noise in either the 420 – 470 MHz (Type NVF-2A) or the 900 MHz ISM band or cellular telephone bands (Type NVF-2B). Both models incorporate a solid reflector positioned behind a resonated half wave driven element, both elements being mounted on a fiberglass rod with an integral pistol grip. The configuration of the reflector and driven element are such that a deep null in the signal being received will occur when the antenna is pointed in the direction of the signal being radiated. A T-pad resistive attenuator is also incorporated in the antenna mounting enclosure to aid in the direction finding process on very strong signals or when excessive reflections present multiple returns.
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HFDF -
National RF, Inc
National RF's Type HFDF active directional antenna system consists of a high gain RF amplifier coupled to a tunable Faraday shielded loop antenna. Several loop antenna assemblies are available to provide coverage of frequencies in the HF and low VHF spectrum. Due to the nature of a Faraday shielded loop, the antenna exhibits a sharp null through the diametric center of the loop. This null is used to determine the direction of incoming radio signals or to locate electrical noise being radiated from some source. The internal high gain amplifier is used to compensate for the inherent inefficiency of the actual loop at the operating frequency. Overall, the system dynamic response is about +6 dB as compared to the dynamic response of a dipole. To aid in the direction finding process on strong signals, an internal 30 DB attenuator is provided. As the loop antenna presents a bi-directional response, tri-angulation may be required to eliminate the ambiguous signal direction. The line of site of the incoming signal is determined by listening for a signal null on the receiver or by watching the receiver’s S-meter.
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vLoc3-Cam -
Vivax-Metrotech Corp
The vLoc3-Cam is the easiest to use sonde locator on the market today. The omni-directional antenna array allows for approaching the sonde from any position. The directional arrows will guide the user first to the front or rear locate point and then directly to the sondes position. The vLoc3-Cam includes multiple sonde frequencies making it compatible with the major push cameras and crawler cameras on the market. The Pushrod Trace mode shows a second display geared for tracing the path of the pushrod deployed in the pipe or tracing pipes with an optional portable transmitter.
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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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Schwarzbeck Mess Elektronik
Tuned half-wave dipoles have been among the most important antennas from thebeginning of rf-technique. The characteristics of half-wave dipoles havebeen calculable very early using the Maxwell and Hertz equations. Therefore the halfwave dipole became a reference antenna. The ideal (lossless) half-wave dipole has anisotropic gain of 2.15 dBi and an impedance of 73 Ohm. The directional pattern is circular inthe H-plane, "8-shaped" in the E-plane with the maxima perpendicular on the dipole axis.The half-power beamwidth (-3 dB) is approx. 78°. The impedance of real dipoles isdepending on the thickness/length ratio of its elements, typical values are 60-70 Ohm.Dipoles for industrial applications are available in the frequency range from 30MHz to up to approx. 4 GHz. The dipole elements are length variable (telescopic) orwith fixed length, the latter especially above 1 GHz. The most important applications aretest site evaluations (NSA, normalized site attenuation) and the determination of ERP(Effective Radiated Power) respectively EIRP (Effective Isotropic Radiated Power).
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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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ONT-1FE-1GE-RF-W -
Hangzhou Softel Optic Co., Ltd.
ONT-1FE-1GE-RF-W is fiber to the home multi service access XPON ONT. It’s based on the mature, stable, high cost performance EPON/GPON technology and has gigabit Ethernet switching, WDM and HFC technology. ONT-1FE-1GE-RF-W has a higher bandwidth, higher reliability, easy management and good quality of service (QoS) guarantee. It supports GPON and EPON two modes adaptive, can quickly and effectively distinguish between GPON and EPON systems, so normal operation under the current system. It adopts single fiber WDM technology with downlink wavelength 1550nm and 1490nm, uplink wavelength 1310nm . It only needs one-core fiber to transmit data and CATV service. ONT-1FE-1GE-RF-W can integration wireless function with meet 802.11 n/b/g technical standards, It has external high gain directional antenna, the wireless transmission rate up to 300Mbps. It has the characteristics of strong penetrating power and wide coverage. It can provide users with more efficient data transmission security.
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Type HFDF -
National RF, Inc
National RF’s Type HFDF high frequency location system is a proven noise hunting and location directional antenna system that allows you, in many cases, to walk right up to the source of High Frequency (HF) noise! Used by several power companies around the United States, professional noise hunters, and other communications specialists, the HFDF has located noise sources that emanated from pole power transformers, arcing electric fences, CATV in-line amplifiers, plasma TV screens, and even Marijuana grower’s heating lamps! The system incorporates several plug-in, tunable magnetic loop sensors of a proprietary National RF design, that cover the frequency range between 1.8 MHz and 55 MHz. The unit is packaged in a hand-held, lightweight metallic enclosure, with a pistol grip and a magnetic compass mounted on top. The compass is used to get magnetic bearings to the noise source, which may be plotted on a map to triangulate, and ultimately pin-point, the location of the noise source. In certain cases, our customers tell us that they have been able to walk right up to the interfering noise source and correct the situation on the spot!
