A multichannel dual-mixer stability analayzer: progress report
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frequency time stability↗
Engineering topics
Stevens, G. L.
Publications and source records attributed to Stevens, G. L..
A multichannel dual-mixer stability analyzer: progress report
A stability analyzer is being developed for frequency standards in JPL's Deep Space Network. Prototype hardware and software have been built. Initial tests on 100-MHz sources show an Allan deviation noise floor of about 7 X 10(sup -15) at 1 second for a dual-mixer channel.
frequency time stability dual mixer↗
Improved RF Isolation Amplifier
Circuit has high reverse isolation and wide bandwidth. Wideband isolation amplifier has low intermodulation distortion and high reverse isolation. Circuit does not require selected or matched components or directional coupling device. Circuit used in applications requiring high reverse isolation such as receiver intermediate-frequency (IF) strips and frequency distribution systems. Also applicable in RF and video signaling.
Stevens, G. L.↗
A High-performance Hybrid RF Isolation Amplifier
A high-performance hybrid RF Isolation Amplifier (Iso-Amp) has been developed at JPL. The circuit exhibits a unique combination of RF characteristics at performance levels exceeding those of any commercially available device. Recent improvments in the design have resulted in significantly higher reverse isolation, a four-fold increase in bandwidth and improve reliability. These devices are very useful in RF and IF signal conditioners, instrumentation, and signal generation and distribution equipment. These Iso-Amps should find wide application in future DSN and R&D RF systems.
Stevens, G. L.↗
Input signal conditioner for the multimegasymbol telemetry system feasibility model
The input signal conditioner portion of the multimegasymbol telemetry demodulator and detector feasibility model is described. The input signal conditioner accepts the 55 MHz wideband IF signal of a Block 4 Deep Space Network receiver and provides selectable bandpass filtering, total power automatic gain control, and frequency translation providing inphase and quadrature outputs at baseband.
Stevens, G. L.↗
Three-channel integrating analog-to-digital converter
A three-channel integrating analog-to-digital converter was added to the complex mixer system to accept the baseband, complex signals generated by the complex mixers and output binary data to the digital demodulator for further processing and recording. The converter was first used for processing multistation data in radar experiments in the spring of 1977.
Stevens, G. L.↗
Complex mixer system modifications
Modifications of the complex mixer system to increase bandwidth and number of channels were made. Three modified complex mixers were installed at DSS 14 and were used to process planetary radar signals in March and April of 1977.
Stevens, G. L.↗