The Mixer input is thus switched from the Preamplifier output to the WWV Receiver output when the relay is energized. ... arm of the controls through R209 and R210, respectively, to the mixer grid, pin 1 of V20l. 5.45 Microphone Circuit.
|Title||:||IGY Instruction Manual for Automatic Whistler Recorders|
|Author||:||R. L. Smith, J. H. Crary, W. T. Kreiss|