Showing results: 136 - 140 of 140 items found.
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PBE Group
PBE Group is a fibre network provider that delivers a vast array of integrated tunnelling and mining projects globally and offers custom fiber-based solutions that are reliable, robust and easy to use.Rebroadcasting systems (LTE, FM, TETRA, P25, etc), video monitoring and real time machine control systems can demand high bandwidth and low latency for operation. PBE offers a wide range of fiber-based solutions that can satisfy these requirements. PBE provides Ethernet over Fiber Network and RF over Fiber Network systems in mines and tunnels.Fiber network has a number of advantages:- Covers greater distances with less loss- Support high bandwidth- Immunity to EMI and RF Interference- Support different topologies (Star, Ring, Tree, etc.)- Flexible design and deployment- Flat frequency response and wide frequency ranges- Easy to implement redundant network
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FIM-71 VHF -
Potomac Instruments, Inc.
The Model FIM-71 is a portable, laboratory quality Field Strength Meter designed for rigorous field applications. Combining a calibrated half-wave dipole antenna and a highly accurate tuned voltmeter with a range of 140 dB, the FIM-71 is suitable for practically all types of RF emission measurements in the 45 MHz to 225 MHz spectrum. The operator can switch select wide or narrow bandwidth, peak or average value of TV or pulse modulated signals, AM or FM demodulation, and a meter dynamic range of either 20 dB or 60 dB. A dc analog output voltage, proportional to the meter indication, is provided for driving a chart recorder. A leveled output from the calibrating oscillator is available for measuring cable insertion loss, filter response, amplifier gain, and other signal ratio measurements. The 4-1/2 inch, taut band, mirrored scale meter is calibrated in volts and dB for precise measurements in field or laboratory environments.
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FIM-72A UHF -
Potomac Instruments, Inc.
The Model FIM-72A is a portable, laboratory quality Field Strength Meter designed for rigorous field applications. Combining a calibrated half-wave dipole antenna and a highly accurate tuned voltmeter with a range of 140 dB, the FIM-72A is suitable for practically all types of RF emission measurements in the 450 MHz to 960 MHz spectrum. The operator can switch select wide or narrow bandwidth, peak or average value of TV or pulse modulated signals, AM or FM demodulation, and meter dynamic range of either 20 dB or 60 dB. A dc analog voltage, proportional to meter indication, is provided for driving a chart recorder or similar device. A leveled output from the calibrating generator is available for measuring cable insertion loss, filter response, amplifier gain, VSWR, and other signal ratio measurements. The 4-1/2 inch, taut band, mirrored scale meter is calibrated in volts and dB for precise measurements in field or laboratory environments.
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Shanghai MCP Corp
Respective dual channels function/arbitrary waveform generator. Sine wave output up to 160MHz, full-band resolution of 1μHz. Pulse waveform up to 50MHz (or 40MHz), adjustable time of rising, falling and duty ratio. Sampling rate of 500MSa/s and vertical resolution of 16bit. 6-bit high-precision frequency meter compatible with TTL level signal. Arbitrary wave storage of 8~32M points, 7GB non-volatile waveform storage. Multi modulation function::AM,FM,PM, ASK,FSK,PSK, BPSK, QPSK,OSK,PWM, QAM, SUM . 16bit digital arbitrary wave (TTL level) DARB. 16th Harmonic Generation Function. Protocol output: I2C, SPI, UART (TTL level). 8 Inch high-resolution TFT color LCD,WVGA(800×480). Standard interface: USB Host, USB Device, LAN, 10MHz clock source input/output. Frequency sweep and burst output. Easy-to-use multi-functional knob and numeric keypad
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ERAVANT
In radio communication, an omnidirectional antenna is a class of antenna which radiates equal radio power in all directions perpendicular to an axis (azimuthal directions), with power varying with angle to the axis (elevation angle), declining to zero on the axis.[1][2] When graphed in three dimensions (see graph) this radiation pattern is often described as doughnut-shaped. Note that this is different from an isotropic antenna, which radiates equal power in all directions, having a spherical radiation pattern. Omnidirectional antennas oriented vertically are widely used for nondirectional antennas on the surface of the Earth because they radiate equally in all horizontal directions, while the power radiated drops off with elevation angle so little radio energy is aimed into the sky or down toward the earth and wasted. Omnidirectional antennas are widely used for radio broadcasting antennas, and in mobile devices that use radio such as cell phones, FM radios, walkie-talkies, wireless computer networks, cordless phones, GPS, as well as for base stations that communicate with mobile radios, such as police and taxi dispatchers and aircraft communications.
