Passive intermodulation (PIM) distance to fault analyzer with selectable harmonic level
US8294469B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Mar 12, 2010 |
| Grant date | Oct 23, 2012 |
| Priority date | — |
| Expiry date | Sep 6, 2030 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B17/17
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A distance to PIM measurement circuit is made using a device such as an AWS transceiver that has separate transmit and receive bands. With a typical AWS transceiver placed in close proximity to a PCS transceiver, the AWS device will include a band reject filter to eliminate interference from the PCS signals. The PIM measurement circuit includes two frequency sources F1 and F2 that are provided through a combiner for characterization of the PIM circuit. To enable distance determination, an FM measurement is created by using an offset sweep generator attached to one of the two frequency sources. To avoid frequencies blocked by the band reject filter, a desired harmonic of a test PIM harmonic signal is selected outside the band of the band reject filter.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.