Transmitter Servicing Course

Posted on Feb 6, 2014

With the equipment ready for operation, the main line switch (S-831), the EMERGENCY SWITCH (S-12) and the main line contactor contacts K-831B all are closed. (1) The keying relay main contacts (K-1C) ground the center tap of the MO filament secondary of T-1 to complete the DC return path to the filament and allow the MO to oscillate. (1) Conta

Transmitter Servicing Course
Click here to download the full size of the above Circuit.

cts K-2B connect the AC supply to the compensator transformer (T-3) to heat the compensating capacitor (C-62). This capacitor is a bi-metallic device which compensates for the changes in MD circuit capacity due to the expansion of tube elements under key-down conditions. (b) If the temperature in the compartment is below 60 ° C, the thermostat (S-13) contacts are open, preventing the thermostat relay (K-20) from being energized. The heating element (R-26) is energized through the normally closed contacts (K-20B) of the thermostat relay. (c) When the temperature in the compartment reaches 60 ° C, the mercury column of the thermostat (S-13) completes the circuit to the thermostat relay coil (K-20A). (e) If either S-13 or K-20 fail to operate, the temperature protection switch (bi-metallic Spencer Disk S-11) will turn the heating element (R-26) off and on within the limits of 71 ° and 55 ° C. 2. GENERAL CIRCUIT CONDITIONS: An electron coupled circuit, Class C, with plate circuit always tuned to the second harmonic of the grid - screen grid circuit. (1) Coarse tuning in 8 steps with MASTER OSCILLATOR RANGE MC control (S-1). Switch interlock contacts S-1C break the keying circuit while S-1A and B are between steps. (b) MO CALIBRATION CORRECTOR capacitor (C-61) should be set half open before the transmitter is calibrated. When MO tubes or parts are changed, C-61 may be adjusted to make the MO frequency correspond to the...

Leave Comment

characters left:

New Circuits



Popular Circuits

12 Volt 20 Amp Solar Charge Controller
Car clock temp voltmeter
Wireless Piezo Beeper
low frequency oscillator
Current and Variable Voltage Power Supply
Speed Control of DC Motor using Microcontroller by using PWM ECE Project
Norman P2000D Modeling Light Circuitry