VF-4

Improves measurement accuracy of distortion tests
Compatible with all spectrum analyzers and meters
55–880 MHz operation
Extend the range and accuracy of fiber-optic measurements
Field portable

Eliminate input overload problems from your distortion tests.

T he Trilithic VF-4 Tunable Preselector re-selector Filter allows you to improve the accuracy of your distortion tests by providing the preselector needed to accurately measure composite triple beat, cross modulation and other spurious signals in a working CATV system.

A VF-4 filter blocks illegitimate signals – which spectrum analyzers and signal level meters can generate because of input overload – and passes only 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 as much as 30 dB.

Specifications

Frequency Range

Frequency Range	55-880 MHz in four bands
Shape Factor	(30 dB BW / 3 dB BW) = 2.2 / 1 maximum
Insertion Loss	1.5-3.5 dB, depending on band
In-channel VSWR	1.5:1, maximum

AM-1000 Preamplifier:

Frequency Range	50-1000 MHz
Nominal Gain	20 dB @ 600 MHz 17 dB @ 750 MHz 16 dB @ 1000 MHz
Impedance	75 Ohms, nominal
Noise Figure	5 dB
Power	Internal NiCad battery, 4 hours operation per charge

Upgrades

VF-4 Hard Case

Hard case replacement for the VF-4.

Accessories

VF-4 Carrying Case (CC-11)

Padded carrying case for the VF-4.
AM-1000 Preamplifier

75 Ohm, 20 dB Preamplifier, Battery operated. Installed in lid of VF-series filters.
AM-1000/Tricorder Battery

NiCAD battery for the AM-1000 Pre-Amplifier used in VF-4 & VF-5 Portable Pre-Selectors and the Tricorder.
AM-1000RC Preamplifier

AM-1000 retrofit kit for existing VF-series filter banks. Includes new VF-4 case and AM-1000.
AM-1000 Bench Type Preamplifier

20 dB preamplifier, bench-type, 75 Ohm. Stand alone Unit.
75 Ohm BNC Female Connector
75 Ohm F Female Connector
T7-T12 Filters (In Benchtop Enclosure)

Fixed frequency T7 through T12 channel filters.

Related Items

DCVF-5 Automated Preselector Filter

Automated forward and return pre-selection. GPIB and front panel user controls. Switchable T7-T13 channel filters, tunable from 55 - 880 MHz, integrated 20 dB preamplifier and switchable aux signal ports for special testing requirements.

VF-4

Tunable Preselector Filter