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Showing results: 646 - 648 of 648 items found.

  • 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.

  • 6000 Series Analog I/O Modules

    Pacific Instruments, Inc.

    Series 6000 analog I/O modules condition, amplify, filter and digitize signals from virtually any transducer. All modules have conditioning & amplifier per channel and nearly all modules allow for setting bridge completion, shunt calibration, transducer power, gain, etc. individually per channel. Following the conditioning/amplifier stage, multi-pole Bessel or Butterworth analog filters are provided on each channel and can be set or bypassed individually by program control. A number of the modules include a high level analog output providing a conditioned/filtered output to a redundant, external A/D system. A 16-Bit Successive Approximation A/D follows the analog filter stage. Some modules use a single A/D with sample and hold while others have an A/D per channel. Sample rates are programmable per channel to easily accommodate mixing high and low speed measurements into a single data stream. Programmable hardware based warnings and alarms are included in the channel-by-channel architecture and are detected by digital output modules in the system, providing an ultra-low latency control capability directly from the data acquisition system.

  • vibration test system

    Labtone Test Equipment Co., LTD

    Labtone EV series of electrodynamic shaker vibration test System simulate the vibration environment under the laboratory condition, and test the impact strength as well as reliability of various vibration test applications.Labtone EV series of electromagnetic vibration testing system simulate the vibration environment under the laboratory condition, and test the impact strength as well as reliability of various vibration test applications. In the laboratory, with the aid of vibration testing system, simulations of reproduction of sinusoidal, random, resonant search and dwell, classical shock and road models, etc. can be achieved. It is essential for product quality assurance, new product research and development.Labtone EV series of electromagnetic vibration testing system is specially designed to meet the need for long time operation. Vertical and horizontal vibrations can be achieved by the installation of vibration resistant base. The standard platform is equipped with high efficiency airbag shock isolation device, so that the vibration transmitted to the building can be minimized. There is no need for additional foundation in most of the cases.A complete set of vibration testing system is composed of shaker, power amplifier and vibration measuring control system, in accordance with the relevant national and international standards (such as: MIL-STD, DIN, ISO, ASTM, IEC, ISTA, GB, GJB, JIS, BS, etc.) to provide technical support for establishing product quality inspection.

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