Thomas C Bell

US Patent:

39315207, Jan 6, 1976

Filed:

Nov 8, 1974

Appl. No.:

5/522176

Inventors:

Thomas H. Bell - Boulder CO
Charles H. Johnson - Arvada CO
Robert L. Lane - Golden CO
Bradley E. Martin - Arvada CO
William H. Tyree - Boulder CO

Assignee:

The United States of America as represented by the United States Energy
Research and Development Administration - Washington DC

International Classification:

G01T 100

US Classification:

250328

Abstract:

Apparatus for use in alpha particle counting with such as photomultiplier tubes, comprising a platform and linkage mechanism whereby samples are moved in linear manner toward and away from ends of the photomultiplier tubes.

US Patent:

20180088161, Mar 29, 2018

Filed:

Sep 7, 2017

Appl. No.:

15/698606

Inventors:

Thomas Edward Bell - Larkspur CO, US

Assignee:

PIM Solutions LLC - Larkspur CO

International Classification:

G01R 29/08
H01Q 1/42
H01Q 7/00
H01Q 1/24
H01Q 5/30
H01Q 1/38

Abstract:

A PIM probe that includes a PIM antenna carried on a wand sized for positioning by hand. The PIM antenna is tuned by loop size to receive PIM corresponding to uplink reception channels of a site antenna generated by downlink broadcast frequencies F and F of the duplex antenna. The PIM antenna vanes may include conductors printed on a PC boards or wire loops. A PIM probe system includes a signal analyzer that displays a representation of PIM received by the PIM antenna. The PIM probe system further includes an RF filter for passing the PIM frequencies of interest and suppressing the test frequencies transmitted by the site antenna, such as a cellular base station antenna. When the site antenna is broadcasting the test frequencies, the technician places the PIM antenna in various locations to detect the presence of PIM in those locations.