AMERITRON AL-82 Руководство по эксплуатации - Страница 5

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The AL-82 has two illuminated meters. The Grid Current meter provides

a continuous indication of the two 3-500z 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 3600 volts no load,

3300 volts full load.

Plate Current (Ip): Read Plate current on the 1000 mA scale. This scale is

25 mA per division. The maximum operating current rating of the 3-500z

is 400 mA SSB or 900

mA CW.

TRANSFORMER INSTALLATION

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

plate transformer area. This package contains the chimneys for the AL-

82. There is a small bag that contains the fuses, fuse caps and the

remainder of the chassis screws wrapped in the packing material around

the anode connector. 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

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.

METERING FUNCTIONS

INSTALLATION

/4-20 mounting bolts. Use care because

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.

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.

Remove the brass

hex nuts and the top flat washer from the two 6-32

/4"

screws on the rectifier board (see Fig. 1). Install the RED lead ring

terminals on the screws and replace the flat washers and

Position the wires so that the black insulated areas are at least

each other and any metal 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)NOTE: Japanese export

model (AL-82J) 82J) should follow the 240V operation steps to properly

connect their transformer. The AL-82J is supplied with a special

transformer for 200V operation.

1. BLUE (Brown wire) to the top relay terminal

2. YELLOW (Black/White) to the top terminal of terminal block

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

4. RED (Brn/Wht) to the bottom terminal of terminal block

Now slide the colored insulating boots back over the terminals. NOTE:

The green wire is not used for 240V operation. There is no green wire on

the AL-82J export model transformer.

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

insulating boots (see Fig. 1) for 240V operation, or for 200V operation in

Japan. 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.

hex nuts.

/4"

from

/4"

hex nuts.

/4"