AMERITRON AL-82 Buku Petunjuk - Halaman 4

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SAFETY INTERLOCK

While the Amplifier's top cover is in place, the interlock switch

closes to allow AC line voltage to reach the power transformer.

When the top cover is removed, the interlock opens and

disconnects the line voltage. This does not discharge the bank of

power supply filter capacitors. Be sure to allow the filter

capacitors to discharge before you touch anything inside the

Amplifier. You can select the High Voltage function of the

Multimeter to check the high voltage potential. Never attempt to

defeat the safety interlock.

of this amplifier with the unit plugged into the power line.

DRIVING POWER

This Amplifier is designed to operate at full ratings when it is

driven by an exciter that has approximately 100 watts of RF

output. You can use an exciter that has lower output power, but

the Amplifier's output will be less. If you use an exciter that

delivers more than 100 watts, carefully adjust the driving power

to avoid "over drive" and the creation of spurious signals, which

create needless interference to other operators. We highly

recommend that you use a monitor scope for continuous output

monitoring. The display on an oscilloscope is the best way of

determining the amplitude of the voice peaks which, if

excessive, can cause "flat topping" and splatter.

IMPORTANT: In no case should you advance the power output

control of your exciter beyond the point where the Amplifier's

Power Output indication ceases to increase. If you turn the

control past this point, nonlinear operation may occur.

FILAMENT SUPPLY

The filament circuit of this amplifier satisfies all requirements

of the tube manufacturer related to tube performance and life.

Inrush current is controlled by the transformer internal

resistance and impedance, filament choke resistance and

filament wiring resistance. To insure maximum life of the tube

never replace any circuit components or wiring with substitute

parts.

The low voltage tap on the filament transformer primary pro-

vides the ability to operate the blower at slower speeds for

reduced noise. Normal amateur operation in CW and SSB will

not cause heat damage to components on any recommended tap.

It is always advisable to use the maximum speed (air flow) that

the level of noise permits to extend component life. Wiring

information for the blower is shown in the "Transformer

Connections" instructions on page 6.

The high voltage present on the plate choke and air variable

capacitors attracts dust and dirt out of the air stream. It is

particularly important that the high voltage areas at the bottom

of the plate choke and the insulators on the air variable

capacitors be dust free. These areas should be inspected every

few months if the amplifier is operated in a dusty environment.

Unplug the line cord, and wait about 90 seconds until the power

supply capacitors discharge. Check the HV scale for zero

voltage before removing the cover. Remove the cover and

connect a jumper wire from ground to the anode connection of

the tubes.

GENERAL INFORMATION

WARNING- Never remove the cover

PERIODIC MAINTENANCE

PLATE SUPPLY

The plate supply has a full wave bridge rectifier and a 1.8 KVA

CCS rated tape wound hypersil transformer. Filtering is

accomplished by a bank of high quality capacitors totaling 26

mfd (additional capacitance will not improve supply

performance). The Plate Supply will not be harmed by normal

continuous amateur operation at 1500 watt levels. Power is

applied through RLY2 when the 12V DC low voltage supply is

activated. A 10 ohm resistor limits the line current during the

filter capacitor charge time to lower the stress on components.

When the primary voltage approaches the full line value, RLY3

shorts the 10 ohm resistor and applies the full line voltage to the

plate transformer. The 10 ohm resistor acts as a fuse during start-

up if the high voltage supply has a short.

EXPORT MODIFICATIONS

A simple modification will allow operation on frequencies above

15 meters. Instructions for this modification are available by

sending a written request for "Export Modification Instructions"

along with a copy of a valid amateur license. There is no charge

for this information. Export models are shipped with this

modification and have an "X" or "J" following the serial number.

Standard frequency coverages are indicated in the chart

following the tuning instructions on page 10.

TECHNICAL ASSISTANCE

Technical assistance is available during our normal business

hours on weekdays. The following information is required to

assist you with operational problems:

Name and daytime phone number

2. Model and Serial Number

3. Date of purchase and dealer

Meter readings at all stages of the tuning proceedure are very

important along with a complete description of the other

equipment used with our product.

Written assistance is also available. Due to time delays in

processing mail, please allow at least three weeks for a written

AMERITRON

116 Willow Rd. Starkville,

Ms. 39759 Telephone

(601)323-8211 FAX (601)

NOTE: This is a safety wire that must be installed when

beginning service work. After service is complete, reverse the

procedure to remove the safety wire. Remove the wire from the

anode connection first and then from ground.

Use a soft bristle brush dipped in alcohol to clean areas men-

tioned previously. In the event that cleaning is required at

frequent intervals, place a low restriction air filter material over

the air inlet holes on the left front side of the cabinet near the

filter capacitors. Most hardware stores stock suitable materials

that are used as replacement filters for window air conditioners.