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| Number | Title | Issue Date |
| 4092491 | Differential encoding and decoding scheme for digital transmission systems Digital transmission systems operating over microwave radio generally employ phase modulation rather than amplitude modulation because phase modulation is less sensitive to non-linearities in the transmitter. Coherent demodulation is typically employed in... | 05/30/1978 |
| 4048559 | Method and apparatus for testing microwave repeaters for IM distortion Microwave repeaters and the like are tested for third-order IM distortion by applying two, swept-frequency test-tones to the repeater. The test-tones are offset by a fixed frequency difference δ. A detector circuit, connected to the output of the repeate... | 09/13/1977 |
| 4039968 | Synchronizing circuit A circuit for synchronizing a microwave oscillator with a reference source of known frequency. The synchronizing circuit includes a phase-lock loop which compares the output of a free-running, crystal-controlled, voltage-controlled oscillator with the out... | 08/02/1977 |
| 4039947 | Protection switching system for microwave radio A protection switching system for microwave radio employs a frequency-agile-repeater (FAR) which is automatically re-tuned to the frequency of a failed repeater. A shutter associated with the failed repeater reflects the input signal normally employed by ... | 08/02/1977 |
| 4039966 | Phase-lock loop circuit A conventional phase-lock loop circuit is modified for use at microwave frequencies. The modification includes a low-frequency oscillator connected in the phase-lock loop to sweep the voltage-controlled oscillator through the frequency of the incoming sig... | 08/02/1977 |
| 4028081 | Method for manufacturing helical optical fiber An optical cable which is relatively immune to the effects of bending and/or tension comprises a helical optical fiber loosely confined within a protective sheath. Apparatus is disclosed for fabricating the helical fiber. For example, as the fiber is draw... | 06/07/1977 |
| 4022988 | Fault locating apparatus for digital transmission system Defective repeaters in a multihop, digital microwave transmission system are located by the use of a special test pattern which is generated at the transmitting terminal. At each repeater station, the two outputs of the phase demodulator are compared to d... | 05/10/1977 |
| 4019140 | Methods and apparatus for reducing intelligible crosstalk in single sideband radio systems Intelligible crosstalk in microwave radio systems employing single-sideband modulation is substantially eliminated by phase-modulating the AM carrier-wave prior to its modulation by the baseband signal. The phase-modulation may comprise a periodic signal,... | 04/19/1977 |
| 4016497 | Feedbackward distortion compensating circuit A feedbackward, distortion-compensating circuit suitable for pre- and post-distortion compensation of non-linear amplifying devices. The circuit taps-off a portion of the output signal of the compensating circuit, cubes it, and combines it with the input ... | 04/05/1977 |
| 4013842 | Method and apparatus for interfacing digital and analog carrier systems Apparatus for interconnecting a time-division multiplex carrier system, such as T1, with a frequency-division multiplex carrier system, such as LMX-3. The interconnexion is effected in an all digital manner by the use of digital filters, thus avoiding the... | 03/22/1977 |
| 4003006 | Pilot tone controlled adaptive amplitude equalizer An adaptive equalizer to compensate for the effects of frequency-selective fading on a microwave radio system. The equalizer includes two Bode-type bump networks and an AGC amplifier whose slope and gain are respectively controlled by pilot tones added to... | 01/11/1977 |
| 3990009 | Method and apparatus for uniquely encoding channels in a digital transmission system In a digital transmission system of the type which employs cross-polarized radio channels, the failure of a transmitter associated with a particular channel can cause an undesired signal cross-over into the receiver of the failed channel. According to the... | 11/02/1976 |
| 3982916 | Method for forming optical fiber preform A process for manufacturing preforms from which clad optical fibers having longitudinal, eccentric, azimuthal index inhomogeneities may be drawn. In one embodiment, the known CVD process for making preforms is modified by the use of asymmetric heating to ... | 09/28/1976 |
| 3982063 | Methods and apparatus for reducing the bandwidth of a video signal Alternate lines of a 526 line video signal are time-stretched and transmitted over a transmission channel of limited bandwidth. At the receiver, the lines are compressed back to their original duration and displayed in an interlaced manner on a convention... | 09/21/1976 |
| 3982274 | Color coding filter for charge-coupled-device camera A color coding filter is combined with a single area-imaging charge-coupled-device (CCD) to form a color television camera. Three-phase CCD of frame transfer type provides a 2:1 interlace scanning format, and the color filter is designed for compatibility... | 09/21/1976 |
| 3980459 | Method for manufacturing optical fibers having eccentric longitudinal index inhomogeneity In a chemical vapor deposition (CVD) process for manufacturing a fiber optic preform, a glass rod is inserted into the preform during the deposition of the core layer. This yields a fiber having a longitudinal eccentric index inhomogeneity which is close ... | 09/14/1976 |
| 3969016 | Low dispersion optical fiber wave guiding structures with periodically deformed waveguide axis The disclosure is directed to optical fiber waveguiding structures, and techniques for fabricating the same, which are designed to have reduced modal dispersion as a result of the deliberate enhancement of mode coupling in the fibers. The mode coupling is... | 07/13/1976 |
