Telecommunications – Transmitter and receiver at separate stations – Having measuring – testing – or monitoring of system or part
Patent
1994-11-28
1997-04-29
Eisenzopf, Reinhard J.
Telecommunications
Transmitter and receiver at separate stations
Having measuring, testing, or monitoring of system or part
455 677, 4552264, H04B 1700
Patent
active
056258917
ABSTRACT:
A pager tuning system (10) that allows an electronic pager (90) to be tuned without having to perform the tuning within a certified screen room. The system (10) is housed within an enclosure (12) that includes an electronics module (36) having an upper cavity structure (40) and a lower printed circuit board (PCB). The PCB has mounted, with the exception of a frequency counting unit (FC1), all the elements that comprise the system's electronics circuit (80). The upper cavity structure (40) has a sufficient depth to contain and secure the electronic pager (90) and includes an antenna wire (66) that functions as an antenna coupler. The antenna coupler interfaces with the pager's receiving antenna (92) when the pager (90) is inserted into the cavity structure (40). The electronics circuit (80) consists of a first 70 MHz band-pass filter (F1) having an input that is connected to the antenna wire (66) and an output that is applied to an R.F. amplifier (U1). The amplifier optimizes the 70 MHz signal before it is applied to a second 70 MHz band-pass filter (F2) where the signal is further refined before application to the frequency counting unit (FC1). The frequency counting unit (FC1) includes a liquid crystal display where the frequency of the pager being adjusted is displayed.
REFERENCES:
patent: 3273150 (1966-09-01), Emerson
patent: 3467867 (1969-09-01), Armes et al.
patent: 4006420 (1977-02-01), Schittko
patent: 4160211 (1979-07-01), Wittrock
patent: 4817196 (1989-03-01), MacNak et al.
Aguinaldo Ferdinand
Tucker Dominic
Cota Albert O.
Eisenzopf Reinhard J.
Sobutka Philip J.
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