Are you looking to improve your testing accuracy on both forward and return paths? Check out the VF-5 Tunable Preselector Filter by Trilithic communication test equipment.

Trilithic officials say it allows you to improve the accuracy of your measurement of composite triple beat, cross modulation and other spurious signals in a working CATV system.

Specifically enumerating the features, company officials say it includes forward and return path pre-selection, it’s tunable from 55 to 880 MHz, it has T7-T12 Channel Filters, a High-Selectivity Shape Factor, optional 20 dB preamplifier and it’s field portable.

In fact, it’s “the only preselector that offers filters for testing on both the return and forward paths,” according to company officials, who note that the VF-5 Tunable Preselector Filter allows you to “improve the accuracy of your measurement of composite triple beat, cross modulation and other spurious signals in a working CATV system.”

One way the VF-5 accomplishes this is by combining six precision fixed filters for return path preselection and four tunable filters for 55-880 MHz range testing, the way company officials explain it, which results in the product offering “the versatility technicians need for the most demanding CATV applications.”

In October TMC’s (News - Alert) Susan J. Campbell wrote that Trilithic offers the CH series of filters that are designed to cover a frequency range from 30 MHz to 400 MHz. The percentage of 3 dB bandwidth easily ranges from 0.2 percent to 3 percent. The CH series relies on a helical coil design to deliver a lower frequency operation.

Units within the CH series are readily available with two through six sections that provide a Chebyshev response with a lower insertion loss. The VSWR is set at less than 1.5:1 and each unit is housed in a high “Q” sturdy aluminum case. To minimize RF leakage, the cavities are iris coupled, as well as shielded.

The CR series of filters offer a frequency range of 400 MHz to 3GHz, with the same percentage bandwidth ranges. Unlike the CH series helical coil design, however, the CR filter series uses ¼ wavelength resonant structures. The availability of the series CR series matches that of the CH series.