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Healthkit T.V. Post-Marker / Sweep Generator IC-57A Click on thumbnails to enlarge. The Heathkit MODEL IG -57A TV Post-Marker/Sweep Generator is a solid-state fifteen-crystal marker generator and electronic sweep generator for alighment of tuned circuits in color or black and white TV sets , and FM RECEIVERS.The Post Marker Generator mixes one or more marker signals with the demodulated signal from the circuit being tested or aligned.The markers are sharp and well defined and will not alter or distort the responce curve of the circuits involve. Therefore, the oscilloscope will show the actual waveshape of the circuit or device under test. As many as six markers can be made to appear simultaneausly on an IF trace.This enables you to adjust the IF circuits for proper waveshape and bandwidth in much less time than would be possible if you were to use the old variable marker system which must be reset and calibrated for each marker frequency.Markers are provided for color bandpass alighment, Picture and sound carrier frequencies for channels 4 and 10,,FM tuner, FM IF, AND discriminator alignment,,and television sound IF adjustments.Modulation at 400 HZ is provided for trap adjustment and for checking and ajustment in FM tuners.The Sweep Generator has three linear sweep ranges.These ranges cover the sweep necessary for proper alighment of FM receivers and TV tuned circuits in the sound IF, color bandpass and video IF circuits and proper overall RF/IF response... (THIS INFORMATION WAS TAKEN FROM THE MANUAL) No DOA (Dead on Arrival) means that we guarantee the unit to work upon delivery. |