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Extra resources for AEL Model FM-12KD, 25KD Broadcast FM Transmitter (installation, maintenance)

Example text

Phases to DC voltmeter (O-500 V) to measure driver grid bias and screen voltages. - 3-15 Table 3-1. Ref. Des. Operating Controls (continued) and Indicators Function 'Womenclature FM-12KD OR FM-25KD TRANSMITTW (Main Control Panel) Selects voltage (Switch) Driver 3M3 DR Screen DC Milliammeter (50-O-50 driver screen current. 3M4 DR Cathode DC Ammeter (O-1 amp DC) mesures driver cathode current. 3M5 PA CATHODE DC Ammeter (O-6 amp DC) measures power amplifier cathode current. 3M6 PA Plate DC Ammeter (O-6 amp DC) measures power amplifier plate current.

Maximum safety the occurrence operation. be energized are incorporated off. proceed as follows: WARNING l'his unit contains high-voltage power supplies. Potentials and high-current up to 7500 volts present and exposed to maintenance working with areas. lock The principal switches arcing fault. a. tools may occur Check that rear doors, viewing cabinet and tightly inter- areas where the nature of a standing by at all swing-down control panel, access covers are all the two RF compartment in position high voltage of defeatable to determine person defeated.

Bore". This is satis- condition. Turn the AU: ADJ screwdrive output note the Driver counterwise output by observing to reduce power level. the Set the the OUTPUT FWD meter reading. f. Again observe setting tion g. should bring with tions the Driver The reduced power the screen meter to the mid-scale posi- the preferred being range for normal line voltage condi- between -10 ma and 0 ma. Check the PA plate power. Screen current. It will circuit efficiency be found that a value between 70% and 75%.

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AEL Model FM-12KD, 25KD Broadcast FM Transmitter (installation, maintenance)


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