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and providing a waveguide beyond cutoff filter in the screen room enclosure for the monitored signal through an attenuator interposed between the detector International Truck International Property Company, L.L.C., Telemetry system
мая 2009 г - A RACK-MOUNTED PRECISION WAVEGUIDE-BELOW-CUTOFF ATTENUATOR WITH AN ABSOLUTE ELECTRONIC READOUT Clarence C Cook
“waveguide-beyond-cutoff" attenuator, dubbed by Wheeler the “piston attenuator." We designed the MMML feed assembly that sat in a little turret on a truck,
cutoff in waveguides, and tried to guide a 50cm wave through a 4.5cm tube (which is well below cutoff .. attenuation and is a characteristic of every real transmission line. RL scales given below the Smith chart that SWR="2".2, and that the return loss is RL = 8.7 dB. parking, the latter usually used by trucks at X-band.
is not simply a matter of adding more attenuation to the . attenuation needed for leveling, the 6 dB for AM, and up to 18 dB for .. uator was of the waveguide-beyond-cutoff type, herding truck convoys as much as riding the air waves.
N. Marcuvitz, Waveguide Handbook, Peter Peregrinus, Lon- don, 1993, pp. 218–221. .. Piston Attenuator (Waveguide beyond Cutoff. Attenuation). The piston
coupled to a mixer (17) via a waveguide section (15) having a cut off frequency being and a local oscillator frequency having a frequency below this cut off frequency, the The actual desired attenuation value of the local oscillator signal can be . US7072649 *, Oct 2, 2002, Jul 4, 2006, Volvo Trucks North America, Inc.
Attenuation in a waveguide below cut-off. The propagation constant is: Equation 1. a="0".1524meters. b="0".0762meters. f="500MHz" (a frequency below cutoff).
Truck-mounted versions ( truck mounted attenuators ( TMA )), similar in some .. a precision attenuator is also known as a "waveguide below-cutoff attenuator.
The waveguide is a brass cylinder whose inside diameter is accurately machined to a known uniform value. During the fabrication process, this guide was stress

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March 2018