Robison's Manual of radio telegraphy and telephony for the use of naval electricians (1918)
Robison, S. S. (Samuel Shelburne), b. 1867, United States Naval Institute, Todd, David Wooster, Hooper, Stanford Caldwell · Annapolis, Md. : The United States Naval Institute · leaf 155
gement, the detector system can be directlyattached to the primary circuit. This is used for a stand-by or pick-up circuit. Only one circuit has to be tuned in this case. Whereas, withall other pick-up circuits heretofore used, the broadness of tuning was toogreat to enable the circuit to be of any… … S^ CCo Fig. 92b.—Receiver Circuit. Fig. 92c.—Pick-up Circuit. An ideal pick-up circuit, it is true, is one that picks up any signal,regardless of wave length, but this would work only when the number ofstations sending within range was very limited, and atmospheric distur-bances were at a minimum,…
