AMERITRON AL-80A Manuel utilisateur

AMERITRON AL-8OA

HIG

FIPOWER

LINEAR

AMPLIFIER

INSTRUCTION

MANUAL

TheAmentronAL-BOA

LinearAmplif

ieris

designed

for

over

1000Watts

outputSSB

PEP(850

WattsoutputonCW)

withhighefficiencyandtotal

reliability.TheAL-BOAcoverstheamateur

radio

bands

160through15

meters.ltalso

featureswidefrequency

coverage

forMARSandother

srrvicesauthorized

tooperateathigh

power.

TheAL-BOAusesanEimac3-5002

high-mu

triode

aclassAB, ground-

grid

circurt.

A built-in

ALC

circuit

prevents

theamplifier

output

from

flat-toppingif

theexciter

gain

inadvertantlysettoohrgh.

TheAL-BOA

isfactorywiredfor117V,

50/60Hz

primary

line

voltage.

-AMEREERSDN:

F-1

03!

VEI.iTILATION

-l-he

AL-804ventilation

system

has

been

designed

and

tested

to maintain

tube

sealtemperatures

safeiy

below

thetube

manufacturer'srating

when

operatedwithin

our

guidelines.

Toinsure

proper

ventilation

your

installation,

observe

the

following:

1. Donot

blockor restrict

the

ventilation

holesin

the

cover.

2.The

exhaustairllowis

over

50CFM.Do

not

"assist"

the

airflowunless

the

fan

used

exceeds

theAL-B0A

blower

CFMbya factor

ol2:1.

3. Donotmount

additionalfans

ontheAL-BOA

cabinet.

4. The

exhaust

airwill

become

quite

warm

athigh

power

levels.

Donot

place

anyheat

sensitive

objects

intheexhaust

air

stream.

POWER

CCNNECTIONS

TheAL-BOAis

supptiedwith

aNEMA

5-i

ptug

for1

17VAC

operation.

TheAL-80A

can

bemodified

tor

234VAC

opera-

tion.lf

you

desiretomake

thismodification,

two

jumper

wires

must

bemoved

new

locations

ontheterminal

block.

(see

rllustration

below)

The

terminal

blockislocated

ontheleft

stdeof

the

rear

panel.

The

rviring

between

the

fuse

boxand

theamplifierA.C.

outlet

must

No.

gauge

orlargerin

order

supplythe

cur-

rent

required

(15

amperes)

without

asignificant

dropinline

voltage.

The

117V

outlet

should

befused

for20

amperes.

ALC

Usea shieldedaudio-type

cable

to connect

the

0-20

volt

negative

ALC

voltage

tothe

transmitter

ALC

input.

Consult

the

transmitter

manual

for

proper

connection

details.

The

amplifier

must

properly

tuned

before

adjusting

the

Proper

adjustmentis achreved

as follows:

1. Setthe

MULTIMETER

switch

the PO position.

2. Set the transmitter

audiocontrol

about

200/o

hiqher

thannormal.

3. Speakinto

themicrophone

in a normal

tone

voice

and

observe

thereading

on the

0-2000

R.F.

Watts

scale.

4.Adjust

theALCADJ control

on the

rear

panel

until

the

amplifieris not

clipping

on an RF

scope.

5.lfan

RFscopeis

not

available,

adlust

theALC

control

theaudio

peaks

donot

exceed

the

single

tone

output

1000

watts.

METERING

FUNCTIONS

The

AL-BOA

has

two

illuminatedpanel

meters.

The

Grrd

Cur_

rent

meter

provides

continous

reading

grid

current.

This

exclusive

feature

Ameritron

amplifiers.

Grid

current

willindicateproper

operation

the

amplifier

better

than

any

other

parameter.

not

exceed

200

thismeter

dur_

Ing

operation

the

amplifier.

The

other

meterreads

plate

Voltage

(HV),

Plate

Current

(lp),

peak

R.F.

Watts(pO)

and

ALC.

The

functions

areexplained

asfoJlows:

PLATE

VOLTAGE

(HV):

Read

DC. ptare

Vottage

on rhe

0-3500

Volt

scale.

This

scaleis 100

voltsper

division.

lrlor-

mal

voltages

are

3100

voltsno

load,2700

vcils

fullload.

PLATE

CURRENT(lp):

Read

ptate

Current

the

0-700

scale.

This scale is 20 mA per division.

The average

operating

current

rating

ofthe

3-5002

400

maximum.

PEAK

R.F.WATTS(PO):

Read

peakR.F,

Wats on the

0-2000

scale.The

scale

has

watt

divisions

below

i0O0

watts

and100

watt

divisions

above

1000

watts.

ALC:

this

position

themeter

indicates

theALC

detector

voltage.

lt provides

a relative

drive

level

indication

of 200

watts

full

scale.Theapproximate

drivelevel

(average,

not

PEP)

can

beestimated

bydividing

the

peak

R.F.Watts

scale

10.

234 VOLT

OPERATION

IMPORTANT

Donotmake

any

modifications

to theAL-B0A

cir-

cuit beforechecking

with our engineering

staff.

lmproper

changes

may

damagethe

AL-B0A

and

void

the warranty.

I I7 VOLT OPERATION

Connection Diogrom

To Antenno

@ atc ao.r

IO AMP

ONtY

To Eorth

Ground

INSTALLATION

Connect

theRF

output

ofthe

transmitter

totheRFlN

connector

the

rear

ofthe

AL-BOAwith

ohm

coax.

Con-

nect

theexisting

station

antenna

system

tothe

OUTcon-

nector

on the

AL-80A

withRG-8

typecoax.

Connect

the

RELAY

phono

jack

ontherear

the

AL-BOA

the

normal-

open

terminals

ofthe

RELAY

jack

onthetransmitter.

The

RELAY

jack

theAL-80A

has

positive

12VDC

open

circuit

and

provides

100

currentwhen

pulled

ground.

Con-

nectas

short

aground

lead

possible

from

a good

earlh

ground

the

GND

terminal.

The

12V

connection

ontherear

panelprovides

12VDC

100 MA maximum

to operate

external

dial lamps or

accessories.

tti

Tronsmitter or

Tronsceiver

RFOUT RELAY ALC

MUI.TIMETER GRIO METER

PIAIL CUEPINI

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r$"'+.ft,:s

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5Y . ,\--!.ul!Jr!r/ 1G

:.ffi 4oo

AVERiTR9N

AL-BOA

AMPLIFIER

ATE

LOAO

MULTIMETER XMT

OPR

STBY

PWR

ItE

Gfl

OFF

l-l

--_\ r Po

Hv\ \ Lratc

5WtTCH

TUNINGINSTRUCTIONS

the

instructionsrnnumencal

order.

the

various

meterreadings

are

different

than

indicatedin

the

instructions,

checktheconnections

from

theexcitertothe

amplifier

and

make

suretheyarecorrect.

Consulttho

manualfor

tho

excrter

if necessary.

. Set

theAL-80Afront

panel

switchesas follows:

PWR

OFFto

OFF

OPR

STBYlo STBY

MULTIMETER

Plug

the

A.C.line

cord

into

the

proper

voltage

outlet.TheAL-80A

factorywired

for

117VAC

50/60

operation.

Set

the

PWR-OFF

switchtoPWR.Themeterlamps

should

light

and

theblower

shouldstart.

Read

the0-3500V

scaleonthe

multimeter.

ltshould

indicate

3100

voltsnominal.

4. With

lhe

amplifier

stillonstandby,tunetheexciterinto

the

normal

5Oohm

loadaccordingtoth€manufacturer's

instructions.

Turn

the

exctterdrive

lully

downaftertuning.

qPlace

thebandswitchonthesameband

the

exciter,thePLATE

tuning

conlrol

inthedial

range

for

the

band

selected

andtheLOADcontrol

atthe

recommended

point

for

theband

in use.

With

the

exciterdrivestillat

zero,

place

the

MULTIMETER

switch

the

position.

Observe

the

0-700mA

scale.

Itshould

read

zero Place

theSTBY-OPR

switchin theOPR

position.

POWER OPTRATE-

SWITCH STANDEY

7. Key

theexciter

(no

drive)andobserve

theplate

current

onthe

0-700mAscale.Platecurrent

should

now

reacj

between50 mA

and100mA.

B. Applyonlyenough

drive

toindicate

a grid

current

of5C

mAoran

ofnomore

than

200

mA.

Tune

the

pLATE

controlformaximurn

grid

current.

ltisnormalfor

the

plate

currenttodip

atthis

point.

lfthe

gnd

current

goes

over

100mA

reduce

thedrive

once.

Unkevtheexciter.

9. PlacetheMULTIMETERswitchin

thePO

position

andobserve

the0-2000

peak

R.F.

vrattsscale.Apply

the

sanre

driveagain

andadlust

theLOADandPLATE

controlsfor

maximumoutput

on the

0-2000

scale.

10.

Increasethedrive

until

125mA

grid

current

indicated.

Adjust

theLOAD

and

PLATE

controls

againfor

max-

imum

output.

The

grid

currentwill

lower

now.

11. Advance

the

drive

200mAof

grid

current.Ad1ust

the

LOAUandPLATE

contrcls

{or

maximum

output

power

(Repeat

thissteptwice.)

The

output

shouldbearound

I000wattsnor.v

withiO0wattsof exciter

power.

12.Apply

enoughdrivetoindicate

eithert000watts

output

power

or 200mA

of grid

current.

Re-peak

the

LOAD

. andPLATE

controls.The

grid

currentmust

notbe

over200

mA,the

plate

current

over55OmA

the

ouipur

over

.1200

watts.

13. In

CWoperationthe

drive

power

shouldbereduced

until

the

plate

current

is400

mAor less.

For

SSBoperation

themodulation

crest

shouldnot

exceed

400

plate

current,

100mA

grid

currenr

or 1200watts

PEP

output

TUNING CHART (Typicol)

FREQUENCY BANDSWITCH PLATE CONTROI, LOAD CONTROL

r. 85 160

li '

t.t

1,1 ')

2l .2

,:.'4. )

:--)Q 1

r_60

1I-

_/)

'l t-

AL-80AX(export

model)

The

AL-80A

will

operate

withfull

output

on allwARC bands

except

24.5

MHz.

The

AL-BOAX

(export

modet)

wiil

operare

with

fuil

output

on ail

wARC bands.

STANDARD

FREQUENCY

COVERAGE

AL.8OA

160

meters 1.8-2.0

MHz

80 meters 3.3-4.4

MHz

40meters 6.3-8.3

MHz

20melers 9.5-15.5

MHz

'15

meters 15.5-21

.5MHz

AL.sOAX

160

meters

80meters

40meters

20 meters

meters

1.8-2.0

MHz

3.3-4.4MHz

6.3-8.3

MHz

9.5-15.5

MHz

15.5-21.5

MHz

2a-29 MHz

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