ALAMO ELECTRONICS CORP.

MODEL AEC - 3RCMB

GENERAL DATA. The alignment of this receiver requires the use of a test oscillator that will cover the frequencies of 40, 600,1400 and 1620 KC and an output weter to be connected across the primary or secondary of the out put transformer. If possible, all alignments should be made with the volume control on maximum and the test oscillator output as low as possible to prevent the AVC froin operating and giving false readings.

CORRECT ALIGNMENT PROCEDURE. The intermediate frequency (I.F.) stages should be aligned properly as the inst step. After the I.F., transformers have been properly adjusted and peaked, the oscillator and loop should be adjusted.

I.F. ALIGNMENT. Remove the chassis and loop antenna from the cabinet and set them up on the bench. Care should be taken to have no iron or other metal near the loop. Do not make this set-up on a metal bench. With the gang condenser set at mini mum, adjust the test oscillator to 455 KC and connect the output to the grid of the first detector tube (12BE6) through a .05 to 1 ind condenser. The ground on the test oscillator should be connected to the ground busa, indicated on the circuit diagram. Align all four I.F, trimmers to peak or maxi. mum rending on the output meter. Ench I.F. has two adjustments at the top of the can.

LOOP ALIGNMENT. Connect the test oscillator to a dummy loop which can be made by colling 2 turns of bookup wire about 6 " in diameter. Place this dummy loop about a foot from the loop on the receiver and in the same plane

As the receiver loop. With the gang condenser set at minimum capacity, set the test oscillator at 1620 KC, and adjust the oscillator (or 1620 KC trimmer) on gang condenser. Next-get the test oscillator 11t 1100 KC, and tune in the signal on the gang condenser. Adjust the gatenni trimmer (or 1400 KC trimmer) for maximum signal. Next set the test oscillator at 600 KC, and tune in signal on condenser to check alignment of coils.