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HF

High Frequency operating at 3–30 MHz.


Showing results: 136 - 150 of 225 items found.

  • VECTOR-GUN HANDHELD DIRECTION FINDING ANTENNA SYSTEM

    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.

  • Noise Location Package

    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!

  • Mini Receiver

    FB7-NX - National RF, Inc

    In about 1935, the National Radio Company of Malden, Mass., brought out a “hot” high frequency receiver, called the FB7, and the subsequent FB-7X. It featured a super-hetrodyne design with plug-in coils that gave it a broad frequency range. The “X” model also incorporated a crystal filter in the intermediate frequency section, thus giving it additional selectivity. The receiver was viewed by radio amateurs as a technological breakthrough, and it was also used commercially for point to point high frequency communications. As the receiver did not have an internal RF amplifier section, a separately tunable RF amplifier was later provided in a separate enclosure for additional performance capabilities. Now, National RF, Inc., is resurrecting the fabled receiver name with an all solid-state, hot mini receiver, which also utilizes plug-in coils to cover the HF spectrum. The mini-receiver is designed for use by radio amateurs as well as serious short-wave listeners, and allows reception of AM, CW, and SSB signals. It incorporates a super-hetrodyne design with a dual gate FET built-in RF preamplifier and a ceramic filter for selectivity, often required when used in a crowded amateur radio band. In addition, the receiver has a buffered rear panel output of the high frequency oscillator for use with either a frequency counter for exact receive frequency display, or for interface with an outboard transmitter. A rear panel jack is also provided for muting the receiver when a transmitter is placed into the transmit mode. And, the receiver is small enough to fit into carry-on luggage and taken on trips when it is desired to “keep an ear” on amateur radio or other high frequency activity. The receiver utilizes rear panel plug-in coil assemblies which contain the RF amplifier, mixer, and oscillator tuned circuits. Each plug-in coil assembly also comes with a separate dial scale, which is inserted onto the front panel for displaying the tuned frequency. A very smooth 6 to 1 planetary drive is used for tuning the receiver. Other front panel controls include RF preamplifier peak, volume control, Beat Frequency Oscillator adjustment, and RF gain control. Other switches include filter bandwidth, AM/CW/SSB selection, Power, and a general coverage/band spread control for certain plug-in assemblies. The receiver is intended to drive head-phones via a rear panel jack, but has sufficient output to drive a small external speaker.

  • Compact Loudspeakers

    ULTRA-X40 - Meyer Sound Laboratories Inc.

    The ULTRA-X40 brings the technology breakthroughs in our flagship LEO Family line arrays to a versatile, compact loudspeaker. Its innovative concentric-driver configuration couples two 8-inch cone drivers to a rotatable waveguide surrounding a 3-inch high-frequency compression driver, to deliver smooth response across its entire range and directional control down to 400 Hz.

  • Compact Range for 5G & High Frequency Wireless Communications

    ART-Fi SAS

    Wireless devices are moving toward higher frequencies, and 5G is coming soon. With that in mind, we partnered with WavePro to build an ultra-precise, high-frequency compact range (up to 300GHz) with 50% quiet zone efficiency. Customers can now measure an accurate radiation pattern of a laptop with built-in WiGig transmitter within a 1.2m x 1.2m x 2.2m space.

  • Data AcQuisition And Real-Time Analysis

    Daqarta - Interstellar Research

    DAQARTA turns your Windows sound card into a precision laboratory instrument, loaded with advanced features. Put your sound card to work!Daqarta now allows remote control by an external program, custom reports, and custom data logging. Sample rates up to 256 kHz are supported, as well as slow input sampling (down to one sample per day or slower) while maintaining full output sample rates for simultaneous high-frequency stimulus generation. Allows slow scroll rates for chart recorder display of DC signals like temperature and pressure, and provides circuits to allow ordinary sound cards to handle DC measurements.

  • Digital Quad-channel High-frequency Lock-In Amplifier -

    eLockIn 205 - Anfatec Instruments AG

    Input sampling rate of more than 500 MHz(fully digital design,10 MHz bandwidth)real quad-channel amplification in the full frequency range 4 channel output data with 1 us group delay dual harmonic mode in the full frequency range on-screen 4-channel spectra acquisition web-interface for external communication

  • Digital Quad-channel High-frequency Lock-In Amplifier -

    eLockIn 204 - Anfatec Instruments AG

    The extraordionary filtering quality of this lock-in amplifier resulting in more than 130 dB Dynamic Reserve is achieved by a well chosen oversampling rate of 40 MHz and a fully digital design with 96 bit wide digital filters.

  • Free Feature-Limited Version of Sonnet''s Professional Sonnet Suite

    Sonnet Lite™ - Sonnet Software

    Sonnet Lite™ is a free feature-limited version of Sonnet''s professional Sonnet Suites, which provides EM analysis to thousands of companies across the globe. Many major manufacturers of high-frequency components and boards depend on Sonnet to analyze their predominantly planar high-frequency designs from 1 MHz through several THz.

  • High AC Current Capacitor

    LC1/LC2/LC3-AN - HK Film Capacitor Ltd

    Induction Heating Processing Equipment, High Current Welding, High Power Resonant Circuits, Motor Controls; Oscillating, Bypass, Coupling circuits, High AC Current applications, High-Frequency AC Filter and Medium Frequency Power applications.

  • High AC Current Capacitor

    LC1/LC2/LC3-RNM - HK Film Capacitor Ltd

    Induction Heating Processing Equipment, Electric Current Welding, High Power Resonant Circuits, Motor Controls; Oscillating, Bypass, Coupling circuits, High AC Current applications, High-Frequency AC Filter and Medium Frequency Power applications.

  • High AC Current Capacitor

    LC1/LC2/LC3-BN - HK Film Capacitor Ltd

    Induction Heating Processing Equipment, Electric Current Welding, Resonant Circuits, Motor Controls; Oscillating, Bypass, Coupling circuits, High AC Current applications, High-Frequency AC Filter and Medium Frequency Power applications.

  • High-Frequency Generator

    ZET 7191 - ZETLAB Company

    The ZET 7191 is a high-frequency generator on the CAN bus intended for generating high-frequency signals of any shape. The shape of the generated signals may be of two types: sinusoidal and radio impulse.

  • High-Frequency Head & Torso Acoustic Simulator

    HATS - Brüel & Kjær Sound & Vibration A/S

    Designed for realistic in situ electroacoustics tests on, for example, smartphones, headsets, audio conference devices, microphones, headphones, hearing aids and hearing protectors. High-frequency Head and Torso Simulator (HATS) Types 5128-C and -D are manikins with built-in realistic ear and mouth simulators that provide a realistic reproduction of the acoustic properties of an average adult human head and torso. High-frequency HATS is designed for in situ electroacoustics tests and can cover the full audible frequency range (up to 20 kHz).

  • High Frequency Noise Simulator

    SKS-H04GA - Shanghai Sanki Electronic Industries Co., Ltd.

    The high-frequency noise simulation generator is an EMC test instrument that reproduces high-frequency noise with a fast rise time when the switch is turned on/off. Since the pulse rise time is less than 1ns and contains wide bandwidth noise, it is very suitable for reproducing malfunctions. The line noise entering the power line and the induced noise entering the communication line can be reproduced, and the performance evaluation of the malfunction and function degradation of electronic products can be performed.

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