Metra Electronics DAT Combo Manual de usuario descargar pdf (Pagina 30)

Ask

Me Another

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receiver

were

both

traveling

at

the same

speed?

-E. S.,

Garden

City

Park,

N.

Y.

I guess it

would continue

to receive

the

same

thing like "Johnny

One

Note"

or a pickup

stylus

stuck in a record

groove.

Needle Sticks?

I have

an

Armaco AR4

VOM

with a

95-

microamp meter

movement.

Whenever

the test

leads

are shorted

(for

the resistance

test),

the

needle moves to

only

a point

somewhere

be-

tweet;

one

-quarter

and one -half

scale

position.

Battery

voltage and

all

resistors

seem to

be

OK.

What

could

be the

problem?

-W. J. L., Toronto,

Canada

Still sounds

like resistor

or battery

trouble.

Even if the

resistors

pass

current

and

look OK,

they could

have

changed

in resistance

value.

TV or

Not

TV

How

can I convert

an

old

TV set

into

an

oscilloscope?

-M. S.,

Amherst,

N. Y.

It

wouldn't

be

worth the

trouble.

You

can

buy

a scope

kit

for

about $80

and you

will

get

much

more

benefit

from

it.

Swing

It

1 have

an

old 0 -1

milliammeter.

The

needle

swings

quite

some

time

before

it comes

to

rest.

What

can

1 do

about

it?

-H.

W. B., Bonarlaw,

Ontario

Sounds

like

it needs

mechanical

repair

and

adjustment,

which

could

be expensive

at today's

skilled labor

rates.

Since

a

new meter

costs

so

little,

why don't you

get

a

new one?

RF

Amplifier

Doesn't

1

recently

built

a

class

-C RF

amplifier

which

does

not amplify.

Diagram

is enclosed.

When

1 feed

10

watts

into it,

1 get

about

5

watts out.

Also,

1 get

RF

output

at

the input

but

not

at

the

output

of the

pi

network.

Yet,

the pi

network

still

has

a

tuning

elect.

What

is

wrong?

-J.

P.,

Ogden,

Utah

Looking

at

your

diagram,

it

appears

that C6

is

connected

to

the

wrong

side

of

RF

choke

L4.

If actually

connected

as

shown,

the

plate

of the

tube

is

by-

passed

to

ground

for

RF.

Con-

nect

C6

to the

B+

side

of

L4.

Try, Try Again

How can

1 identify

kind

and

rating of

an

assortment of semiconductors

and transistors

of

assorted shapes

and no

marking?

-G.

W. B., Lancaster,

Calif.

Is it going

to

be a

boy,

girl

or an

it?

That's

the

way it is

with transistors.

When

they reach

the end

of the

production

line,

they're

tested

and

marked

to indicate

what they

turned

out

to

be. You

could

spend

hours running

tests on

your

diodes

and transistors

and trying

to

match

them

up

with the specs on

umpteen

thousand

types.

Just try

them in circuits.

If one

doesn't

do

what you

expect,

try

another

one.

Brand

X

Does

It

Again

I

have a noise

problem

with my two

identical

(Brand

X, Model

Y)

CB transceivers.

It is so

bad

that it

is almost

impossible

to

receive

anything

except

over

very short

distances.

1

have tried

using

them

both

as

a mobile

unit and

a base

sta-

tion,

but both

are

just

as

noisy

in either

applica-

tion.

Can

you give

me a circuit

for

a

noise limiter

1 can

add?

-P.

L.

McG., Knoxville,

Tenn.

Looking

up the

circuit

of your

sets

we find

that

a noise

limiter

is included

and

the

sets

should

be

very sensitive,

the

latter

accounting

for

the

noise.

You

probably

live

near

a

busy

street and

pick

up

ignition

noise

from passing

cars.

Try

moving

your

base

antenna

away from

the street

and,

in

your

car,

suppress

the

noise

at

the source

with adequate

suppression

devices.

Canadian

Ham

Can

you

tell

me

where

I

can

get

a

radio

amateur

license

in

Canada?

-R. M.,

Lacombe,

Alberta

Write

to

the

Department

of

Transport

in

Ottawa.

They

can

furnish

you

the

address

of

their

nearest

field

office.

(Continued

on

page

35)

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32

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