Abstract: The present invention provides a method for determining a local oscillator frequency for a baseband converter, comprising obtaining characteristics of a channel comprising a plurality of radio signals at corresponding radio frequencies; using the channel characteristics to select a local oscillator frequency to use in baseband conversion of the plurality of radio signals of the channel to form a first baseband converted signal and a second baseband converted signal; and programming a local oscillator to operate the selected local oscillator frequency; wherein the local oscillator frequency is selected such that an image rejection ratio of the baseband converted second signal to an image of the baseband converted first signal is above a predetermined threshold.

Abstract: The present invention provides a method for determining a local oscillator frequency for a baseband converter, comprising obtaining characteristics of a channel comprising a plurality of radio signals at corresponding radio frequencies; using the channel characteristics to select a local oscillator frequency to use in baseband conversion of the plurality of radio signals of the channel to form a first baseband converted signal and a second baseband converted signal; and programming a local oscillator to operate the selected local oscillator frequency; wherein the local oscillator frequency is selected such that an image rejection ratio of the baseband converted second signal to an image of the baseband converted first signal is above a predetermined threshold.

Abstract: An optical fiber quick disconnect mechanism comprised of left and right separable portions is set forth. One portion is ideally anchored to a pressure isolating bulkhead at a drilled passage which is provided with threads partly along its length; a fixed portion of the quick disconnect mechanism can be anchored there. This enables division of an optical fiber into left and right portions which provide an optical path therethrough. The left and right optical portions are supported by alignment capillaries and the detachable portion of the equipment includes a threaded body which joins to the fixed portion.

Abstract: An optical rotary joint for use in a well logging cable is set forth in the preferred and illustrated embodiment capable of transferring two or more data streams traveling along two or more optical fiber channels. The rotary joint is constructed with a stationary portion and a coacting rotary portion. A first channel of data is delivered to an optical fiber transmitted coaxially of the stationary and rotary sides of the apparatus, transfer across the rotational plane between the two components being accomplished by opposing centrally located, concentrically arranged, coacting optical lenses. A second data channel transmitted through a second optical fiber is delivered to a lens system which converts the light into a cylinder of light coaxial with the first channel and which surrounds the optical management for the first channel. All channels other than the first channel thus are converted into coaxial hollow cylinders of light.