AMERITRON ATP-102 User manual

AMERITRON

ATP-102

AMPLIFIER

TUNING

PULSER

INSTRUCTION

MANUAL

Carrier

tune

duty

ATP-102

Tuning

Pulser

PLEASE

READ

THIS

MANUAL

BEFORE

OPERATING

THIS

EQUIPMENT

AMERITRON

116

Willow

Road

Starkville,

39759

USA

662-323-8211

1997

Ameritron

ATP-102

Instruction

Manual

Tuning

Pulser

Ameritron

ATP-102

Tuning

Pulser

The

Ameritron

ATP-102

Tuning

Pulser

relieves

temperature

stress

amplifiers,

tuners,

and

dummy

loads

while

allowing

proper

system

adjustments.

allows

amplifiers

properly

adjusted

without

the

use

long

steady

carriers.

The

Ameritron

ATP-102

Tuning

Pulser

allows

tuning

amplifier

with

full

required

drive

from

the

transceiver

without

over-heating

the

finals

anything

else

the

line.

sends

series

pulses

the

transceiver

allowing

the

peak

power

high

enough

drive

the

amplifier

full

power,

but

with

the

average

power

being

low

enough

not

over-heat

the

final(s).

The

Ameritron

ATP-102

Tuning

Pulser

works

with

any

solid

state

amateur

transceiver

transmitter,

and

all

other

equipment

using

positive

keying

line

voltages

below

volts

open

circuit

and

100

closed

key

current.

can

also

used

with

negative

voltage

key

lines

(commonly

found

older

tube

type

radios)

provided

keying

voltages

are

below

volts

open

circuit.

The

Ameritron

ATP-102

Tuning

Pulser

valuable

troubleshooting

and

diagnostic

aid.

The

Ameritron

ATP-102

Tuning

Pulser

can

used

performance

tests

QSK

systems,

wattmeters,

and

other

equipment.

The

Ameritron

ATP-102

Tuning

Pulser

uses

single

9-volt

battery

for

power,

with

battery

life

dependent

operating

and

storage

time.

install

the

battery

remove

the

cover

removing

the

two

screws

(one

each

side)

that

secure

it.

battery

clip

and

holder,

located

the

left

side

the

enclosure,

are

provided

for

installing

the

9-volt

battery.

Technical

Description

The

Ameritron

ATP-102

Tuning

Pulser

uses

555

timer

driving

FET

open

drain

switch.

Two

front

panel

controls

allow

independent

adjustment

both

pulse

repetition

rate

(PULSE

RATE)

and

on-to-off

time

duty

cycle

(DUTY

CYCLE).

PULSE

RATE

adjustable

from

about

pulses

per

second,

while

DUTY

CYCLE

adjustable

from

about

percent.

The

keying

time

intervals

are

typically

adjustable

from

"on"

time,

and

pulse

repetition

time

interval.

Minimum

duty

cycle

and

the

slowest

PULSE

RATE

occur

the

full

counterclockwise

settings

both

front

panel

controls.

ATP-102

Instruction

Manual

Tuning

Pulser

The

CARRIER

button

momentary

contact

switch

that

temporarily

locks

the

transmitter

continuous

carrier

transmit

mode.

The

PULSE

button

latching

switch

that

activates

the

pulse

circuit

when

pressed

and

locked.

Speech

Duty

Cycle

The

duty

cycle

average

power

peak

envelope

power

varies

widely

the

real

world.

Every

voice

and

system

varies,

universal

duty

cycle

peak

average

power

applies

the

many

real-world

combinations

voices

and

equipment.

Unprocessed

speech

usually

has

average

power

between

one

percent

and

ten

percent

peak

envelope

power.

Sustained

speech,

such

long

"hello",

produces

average

power

levels

that

typically

range

from

30%

PEP.

Heavy

speech

processing

increases

the

average

power,

pushing

the

short

term

average

power

normal

speech

30%

more.

During

normal

voice

operation,

most

equipment

heat

generated

the

quiescent

current

required

make

the

transmitting

system

linear.

Proper

amplifier

transmitter

tuning

require

adjustments

maximum

peak

power,

generally

with

maximum

available

drive

from

the

exciter.

continuous

tone

carrier

generally

used

during

adjustment,

and

the

amplifier

generally

tuned

for

maximum

output.

The

continuous

single

tone

carrier,

commonly

used

adjust

the

tuner,

will

raise

heat

significantly.

The

Ameritron

ATP-102

Tuning

Pulser

allows

proper

tuning

while

driving

the

with

low

duty

cycle

waveform.

NOT

necessary

use

peak

reading

meter

when

adjusting

amplifier

tuner

with

the

Ameritron

ATP-102

Tuning

Pulser

II,

although

the

lack

true

peak

reading

meter

will

prevent

you

from

knowing

the

amount

peak

power

produced.

ATP-102

Instruction

Manual

Tuning

Pulser

PULSE

RATE

and

DUTY

CYCLE

The

Ameritron

ATP-102

has

two

front

panel

controls

labeled

Pulse

rate

and

duty

cycle.

indicated

the

names,

these

controls

adjust

the

rate

which

the

transmit

keying

pulses

occur

(pulse

rate),

and

the

ratio

on-

to-off

time

(duty

cycle).

Some

care

must

used

insure

PULSE

RATE

slow

enough,

and

the

DUTY

CYCLE

long

enough,

within

the

keying

response

limits

the

exciter

and

meter.

the

pulse

rate

too

fast

and/or

the

duty

cycle

too

long,

the

pulses

will

blur

into

one

long

steady

signal.

The

typical

exciter

has

leading

edge

rise

time

and

tailing

edge

decay

time

few

milliseconds.

This

stretches

the

pulse

duty

cycle

out,

making

the

actual

envelope

have

longer

duty

cycle

than

the

actual

keying

waveform

from

the

Ameritron

ATP-102

Because

this

effect,

the

Ameritron

ATP-102

Tuning

Pulser

may

actually

produce

100%

duty

cycle

waveform

high

(clockwise)

PULSE

RATES

with

longer

(clockwise)

on-time

DUTY

CYCLE

settings.

the

pulse

rate

too

slow

and/or

the

duty

cycle

too

slow,

peak

power

will

not

reached.

All

exciters

have

delayed

response

the

leading

edge

the

keying

waveform.

This

delay

may

prevent

full

peak

power

from

being

reached

the

duty

cycle

too

short.

Most

peak

meters

have

limited

response

time,

this

causes

lower

power

readings

with

short

duty

cycle

pulses.

Another

problem

nearly

all

meters

have

limited

storage

time,

causing

the

meter

"fall-back"

during

the

time

interval

between

pulses.

obtain

the

most

accurate

meter

readings,

both

PULSE

RATE

and

DUTY

CYCLE

should

set

far

enough

clockwise

allow

maximum

peak

power

indicated

scope

peak

reading

meter.

Some

peak

meters

not

read

true

peak

power

all,

instead

reading

something

less

than

the

true

peak

power.

your

meter

reads

less

power

when

the

pulser

used,

compared

the

power

when

steady

near

steady

carrier

produced,

your

meter

probably

not

good

peak

reading

meter.

Nearly

every

radio

and

amplifier

produces

peak

power

than

steady

carrier

power,

because

ALC

response

time

and

power

supply

voltage

sag

under

load.

Too

much

duty

cycle

on-time

can

cause

unwanted

component

heating.

ATP-102

Instruction

Manual

Tuning

Pulser

The

ideal

compromise

(especially

for

tuning

amplifiers)

achieved

when

the

PULSE

RATE

and

DUTY

CYCLE

controls

are

near

the

counter-clockwise

end

where

the

power

drops

off,

but

adjusted

slightly

clockwise

from

the

point

where

the

peak

power

meter

starts

fall

back.

such

setting

can

not

found,

strong

indication

the

meter

does

not

indicate

peak

power

accurately.

Connecting

the

Ameritron

ATP-102

Tuning

Pulser

The

Ameritron

ATP-102

Tuning

Pulser

connects

the

Key

jack

your

exciter

via

the

Ameritron

ATP-102

Tuning

Pulser

rear

panel

jack

labeled

"Output".

The

Output

jack

standard

RCA

phono

plug,

with

the

center

connected

the

positive

voltage

keying

line

(less

than

volts

and

100

mA)

and

the

outer

shell

grounded.

the

case

the

Ameritron

ATP-102

Tuning

Pulser

kept

isolated

from

ground,

the

Ameritron

ATP-102

Tuning

Pulser

can

used

with

negative

keying

line

voltage

radios

provided

radio

keying

line

voltages

are

below

volts.

The

primary

concern

the

shock

hazard

and

potential

accidentally

keying

the

rig

the

cabinet

the

Ameritron

ATP-102

Tuning

Pulser

the

operator

comes

contact

with

grounded

equipment.

WARNING:

Never

use

the

ATP-102

with

negative

keying

line

rigs

that

have

over

volts

the

key

jack.

Tuning

Amplifiers

Nearly

all

power

amplifiers

(PA's)

are

properly

tuned

when

maximum

envelope

power

obtained

with

full

exciter

output.

Tuning

the

amplifier

match

exciter

peak

power

prevents

gain

compression

(flat-topping),

reduces

splatter

and

distortion,

and

reduces

the

chance

damage

from

arcing.

Maximum

average

power

directly

(although

considerably

less

than)

maximum

peak

power.

While

the

lack

good

peak

reading

meter

prevents

measurement

true

peak

power,

virtually

any

power

meter

will

provide

correct

indication

tuning.

When

the

amplifier

tuned

produce

maximum

average

power

when

driven

with

constant

rate

and

duty

cycle

pulse,

almost

certainly

tuned

for

maximum

peak

power.

The

least

damaging

and

cleanest

tuning

condition

generally

occurs

when

the

peaked

slightly

beyond

maximum

output,

direction

that

OPENS

UNMESHES

the

capacitor

(this

capacitor

sometimes

called

LOAD,

ANTENNA,

COUPLING,

MATCHING).

ATP-102

Instruction

Manual

Tuning

Pulser

Caution:

very

careful

avoid

applying

full

drive

power

the

without

having

the

load

control

open

far

enough.

When

power

amplifiers

are

undercoupled,

tank

voltages

can

extremely

high.

This

may

cause

tank

components,

such

the

bandswitch

tuning

capacitor,

arc

and

fail.

also

stresses

the

tube

and

other

components

with

needlessly

high

voltages.

The

Ameritron

ATP-102

Tuning

Pulser

will

NOT

prevent

voltage

damage

components.

Adjust

the

two

front

panel

controls

o'clock

position.

With

the

amplifier

stand-by,

push

the

Carrier

Tune

button

and

adjust

the

transceiver's

power

control

the

rated

drive

power

the

amplifier.

Place

the

amplifier

into

operate

mode

and

depress

the

pulse

tune

button

the

Ameritron

ATP-102

Tuning

Pulser

II.

Tune

the

amplifier

for

peak

output

power.

Note:

Due

the

response

time

most

non-peak-reading

watt

meters,

the

meter

will

read

low

average

power,

but

the

amplifier

will

tuned

for

full

peak

power.

While

momentarily

pressing

the

carrier

tune

button,

the

watt

meter

should

read

full

power

the

amplifier.

The

amplifier

now

tuned

for

full

power.

For

best

linearity,

best

reduce

the

transceiver's

power

slightly

after

tuning

the

amplifier.

Testing

QSK

Systems

The

Ameritron

ATP-102

Tuning

Pulser

can

used

evaluate

QSK

systems.

one

test

configuration,

continuous

signal

source

loosely

coupled

the

dummy

load.

The

receiver

tuned

this

signal

source,

and

the

Ameritron

ATP-

102

Tuning

Pulser

controls

are

adjusted

until

the

test

signal

clearly

audible.

The

maximum

QSK

receive

speed

found

measuring

the

PULSE

RATE,

and

multiplying

the

PULSE

RATE

2.4.

The

DUTY

CYCLE

should

set

for

normal

sounding

dots

during

this

test,

1:1

ratio.

The

transmission

waveshape

can

checked

looking

the

output

scope,

with

the

scope

triggered

synchronized

the

keying

line

signal.

normal

signal

has

smooth

rise

and

fall

time

about

one

millisecond,

with

overshoot

undershoot.

Switching

from

manual

operation

full

QSK

should

not

disturb

the

keying

waveform,

change

the

and

off

time

period.

ATP-102

Instruction

Manual

Tuning

Pulser

Testing

Wattmeters

can

tested

measuring

the

single

tone

power

with

barefoot

exciter

running

off

regulated

supply,

and

adjusting

oscilloscope

read

near

full

screen

with

that

carrier.

activating

the

ATP-102

with

the

PULSE

RATE

set

approximately

mid-range,

and

adjusting

the

DUTY

CYCLE

control

until

the

full

peak

envelope

voltage

just

displayed

the

scope,

the

meter

can

evaluated.

good

peak

reading

meter

should

indicate

the

same

amount

peak

power

with

the

ATP-102

pulsing

the

carrier

indicates

with

continuous

carrier,

long

the

maximum

scope

deflection

remains

the

same.

RFI

and

TVI

Troubleshooting

The

Ameritron

ATP-102

Tuning

Pulser

can

used

activate

the

transmitter

with

pulsed

signal

full

peak

power,

without

undue

equipment

heating.

This

will

allow

you

move

the

location

the

device

being

interfered

with,

while

safely

operating

the

transmitter

high

power.

You

can

add

filters,

grounds,

and

move

cables

the

device

being

interfered

with

without

fear

overheating

your

transmitter.

The

short

duty

cycle

also

reduces

interference

other

amateur

operators.

sure

have

licensed

operator

attending

your

station,

and

conform

all

FCC

rules

regarding

emissions.

Technical

Assistance

For

technical

assistance

please

call

Ameritron

662-323-8211.

You

will

best

helped

you

have

your

unit,

manual

and

all

information

your

station

handy

you

can

answer

any

questions

the

technicians

may

ask.

Tuning

Pulser

ATP-102

Instruction

Manual

Schematic

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ATP-102

Instruction

Manual

Tuning

Pulser

Parts

List

Resistor,

OHM

100-3100

Resistor,

1OK

OHM

100-4100

TRI‘

Resistor,

47K

OHM

100-4470

R6,

Resistor,

POT,

500K

OHM

55-5500-1

PQl

FET.2N7000_

305-7000

IC,

Timer,

NESSSCN

311-1003

Switch,

Locking,

2P2P

504-2022

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