AMERITRON AL-1200 Gebrauchsanweisung - Seite 5

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METERING

The AL-1200 has two illuminated meters. The Grid Current

meter provides a continuous indication of the 3CX1200A7 grid

current. This exclusive feature of Ameritron amplifiers indicates

proper amplifier operation better than any other parameter. Do

not exceed 300 mA on this meter during normal operation of

this amplifier. The other meter reads Plate Voltage (HV), Plate

Current (IP), Peak RF Watts (PO) and ALC. These functions are

selected with the Multimeter Switch.

Plate Voltage (HV): Read DC Plate Voltage on the 4000 volt

scale. This scale is 100 volts per division. Normal voltages are

00 volts no load, 3300 volts full load.

Peak RF Watts (PO): Read Peak RF Watts on the 2000 watt

scale. This scale has 50 watt divisions below 1000 watts and

100 watt divisions above 1000 watts.

TRANSFORMER INSTALLATION

Remove the cover of the amplifier. Remove the package that is

in the plate transformer area. This is the fuse pack and chimney

for the AL-1200. Remove the top 7/16" nuts from the four

transformer mounting bolts inside of the amplifier. Carefully

remove the transformer from its shipping carton.

Place the transformer on the four

care because the transformer is heavy. The side with the two

high voltage secondary RED leads must be adjacent to the center

panel(see Fig. 1). Now place a 7/16" nut on each bolt (see Fig.

2). Snug the nuts down manually. Do not tighten with a ratchet

wrench.

Remove the brass

/4" hex nuts and the top flat washer from the

two brass 6-32 screws on the rectifier board (see Fig. 1). Install

the RED lead ring terminals on the screws and replace the flat

washers and 1/4" hex nuts. Position the wires so that the black

insulated areas are at least

objects. Now tighten the

For 240V Operation (factory wired):

The four primary leads have colored plastic insulating boots

over the quick disconnect terminals. Slide these back prior to

installing the leads. Install the color coded boots as follows:(see

Fig. 1)

BLUE (Brown wire) to the top relay terminal

YELLOW (Black/White) to the top terminal of terminal

block

CLEAR (Black wire) to the second terminal of terminal block

RED (Brn/Wht-240V)(Grn-220V) to the bottom terminal of

terminal block

/4-20 mounting bolts. Use

from each other and any metal

/4"

hex nuts.

/4"

NOTE:

This circuit uses an emitter follower to charge a

capacitor to the peak envelope voltage detected by the

ALC/Power Board. Accurate peak envelope power readings are

given when the amplifier is connected to a 50 ohm nonreactive

load. If the amplifier is used with a mismatched load, the power

meter will read higher or lower than normal by a ratio up to the

value of the SWR. Potentiometer R5 on the Meter Board (50-

01140-1) adjusts the calibration of the power meter.

ALC: Indicates a relative drive level (average, not PEP) that

can be estimated by dividing the Peak RF Watts scale by 10.

NOTE: There is a neutralization tab mounted on a ceramic

standoff near the 3CX1200A7. This tab increases the

amplifier's efficiency on 21 and 28 MHz. DO NOT CHANGE

THE POSITION OF THIS TAB.

INSTALLATION

Now slide the colored insulating boots back over the terminals.

Important: The leads must be in the positions indicated by the

color coded insulating boots(see Fig. 1) for 240V operation. For

220V operation, see page 5. Caution: Do not use the 220V

wiring unless the line voltage is always below 220 VAC. The

Standard USA voltage is 240 VAC, not 220.