Alden, Inc. 1857 Schematic

Alden, Inc. 1857

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Product Information:
Model:1857
Manufacturer:Alden, Inc.

Schematic Pages

PNG: Page 1 Rider Manual Volume 19

Schematics Content

Page 1:

Alignment: No attempt should be made to realign this receiver until it has been deter mined that a poor tube, or some local condition is not responsible for faulty reception.
The Signal Generator may be connected through a 0.01 mf capacitor (used as dummy antenna) to the lug on RF section of the tuning capacitor. Connect ground clip of generator to the B- terminal. An output meter may be clipped directly across the voice coil lugs. Align the I.F. trimmers and iron core to 455 kc, using least possible input from Signal Generator to avoid developing A.V.C. voltage which would make the tuning adjustments broad.
Provisions are made to align the R.F. trimmers with the receiver in the metal cabinet. Re move the two plug buttons on the right side of the cabinet and connect the Signal Generator leads to two or three turns of heavy wire, forming a self-supporting loop of about 7 or 8 inches diameter, placed about a foot away from the receiver's loop antenna. Again, use the least possible input from the Signal Generator. With the tuning capacitor plates completely out of mesh, and the pointer at the extreme right end of its travel, adjust the oscillator trimmer (on front section of tuning capacitor) to 1625 kc. Readjust both Signal Generator and tuning capacitor to 1550 kc and adjust the RF trimmer (on rear section) for maximum response.