DRAKE R-4A Spezifikationen PDF herunterladen (Seite 27)

The negative bias supply uses a IN3194 diode to provide -60 volts

to the AVC system for minimum bias, muting, and control of RF Gain.

OB2

voltage regulator VII is incorporated to provide 108 volts regulated for

operation of the xtal calibrator.

IN714

zener diode, in conjunction with

V11

provides

volts regulated for the VFO and H .F. oscillator.

The power transformer has a dual primary.

As supplied, it is connected

in parallel for 120 volt operation.

To operate at 240 volts, it will be

necessary to remove the GRN/BLACK and YEL/BLACK wires from their

present terminals and connect them together at the remaining terminal

of the terminal strip.

This places the windings in series.

It will also be necessary to remove the.75 amp fuse and replace it with

amp slo-blo fuse.

Figure #8

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DRAKE R-4A Spezifikationen Seite 27