Transcription of R-390A notes on alignment and overall sensitivity ...
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R-390A notes on alignment and overall sensitivity ...
R-390A notes on alignment and overall sensitivity ---------------------------------------- ---------------------------------------- -------Measuring receiver sensitivity by Chuck Rippel---------------------------------- ---------------------------------------- --------------------------------------Th ere may be an occasion when its appropriate to measure and record receiver sensitivity in real terms using an accepted standard. For radio receivers, real term sensitivity is expressed as the value of a modulated RF voltage applied to the antenna input necessary to provide a 10db S/N + N figure. This means, what input voltage is required to raise audio output 10 db over the receiver noise the receiver sensitivity in the R390A is an easy, straight forward procedure. The receiver Line Level meter can even be used to help with the measurement. Here is the procedure:1- Turn the receiver and signal generator on and allow them to warm up for 1 Put the receiver and generator on mHz (or any other frequency of choice)3- Set the initial generator output to 1 v and modulation level 1kc, 30% but do not connect the antenna input Set the R390A Function switch to "MGC," Bandwidth to 4kc, RF gain full CW, BFO Set the Line Meter range switch to -10 and carefully adjust the Line Gain control for a -10db indication on the Line Level Watch th
R-390A notes on alignment and overall sensitivity -----Measuring Receiver Sensitivity by Chuck Rippel
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