Observations of Jovian Emissions by Multiple Spaced Radio Spectrographs: from Jim Brown, Hawk’s Nest Radio Astronomy Observatory

Jim Brown, HNRAO, Richard Flagg, WCCRO, Wes Greenman, LGM Radio Alachua, Dave Typinski, AJ4CO Observatory, Andrew Mount, MRAO

Abstract: We describe observations of Jovian decametric emissions using radio spectrographs operating simultaneous at several geographic locations. At times signals appear similar to one another on spectrograms from different observatories. At other times signals received at one or more observatories appear very different from one another. Frequently, signals received at one observatory may not even be detected at other locations. Variations in signal strength and structure are likely caused by ionospheric effects as well as propagation effects in the interplanetary medium.

A Software Lock-In Amplifier

Bruce Randall NT4RT

Abstract: A Lock-In amplifier is sometimes used for signal processing in the Dicke Switch receiver and in the Phase Switched Interferometer. A software Lock-In amplifier was developed for the Windows™ operating system that uses the computer sound board for the ADC and DAC functions. Programming was done in C Sharp programming language. The free C Sharp compiler available from Microsoft™ was used to compile code. Both executable files and source code will be available for conference attendees.