Trilithic VF-4-XX

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Tunable Bandpass Filter VF-4-XXThe Trilithic VF-4 Tunable Preselector re-selector Filter allowsyou to improve the accuracy of your distortion tests by providing thepreselector needed to accurately measure composite triple beat, crossmodulation and other spurious signals in a working CATV system. AVF-4 filter blocks illegitimate signals which spectrum analyzers andsignal level meters can generate because of input overload and passesonly the carrier to be analyzed to the instrument's input. As a result,a VF-4 can improve an instrument's reliable measurement range by asmuch as 30 dB.Improves measurement accuracy of distortion testsCompatible with all spectrum analyzers and meters55-880 MHz operationExtend the range and accuracy of fiber-optic measurementsEach unit is housed in a sturdy aluminum case with high "Q" plated cavities. These cavities are iris coupled and shielded to minimize RF leakage. A constant filter resfJonse is maintained from the low end of the tuning cycle to the high end by varying the loaded capacitance of each section inversely as the frequency is increased. The tuning arm is coupled directly to the driving mechanism which incorporates a precision vernier with a 6:1 ratio. An engraved dial which is calibrated directly in frequency indicates
Refurbished