Metra Electronics DAT Combo Uživatelský manuál stáhnout pdf (Strana 29)

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Solid -State

S -Meter

Can you

tell

me how

I

can

add an

S -meter

to a

transistor

shortwave

receiver?

-A.

D., Utuado,

Puerto

Rico

If your

receiver

has

AGC,

you

can

use

the

circuit

shown

in the first

diagram.

You will

have

to

reverse

the meter

leads,

depending

upon

whether

the set

uses pnp

or

npn

transistors.

On the other hand.

if your

set

does

not have

AGC,

try

the second

circuit. Resistance

values

are

approximate

since

it would

be necessary

to

have

a schematic

of your

set

to determine

exact

values.

FROM

IF

AMP

IFT

DETECTOR

DIODE

AF

OUT

0 -50 DC

MA

AGC

IN34 N3N3_a

"" "vv

n

DETECTOR

I

I

25K

250K

05

MF

050

Mi

MA

Now

You

Know!

In your

White's

Radio

Log,

you

don't

list

police,

fire

and other

non

-broadcast

stations.

Why

not?

-J. B.,

Avon Lake,

Ohio

There

are

more

than

1,500,000

police,

fire

and

other

radio

communications

stations

plus

countless

mobile

units.

It

would

require

several

books

to

list them

all. They

are listed

in

the

several

volumes

of The

Radio

Registry

pub-

lished

by

Radio

Magazines,

Inc.,

Box

629,

Mineola,

N. Y.

Skirling

Got Ya'

Whirling?

On

my shortwave

radio

I hear

tones

which

sound

like bag

pipes.

What

are

they

and what

is

their purpose?

-M. E.,

Brooklyn,

N.

Y.

They

are

undoubtedly

tones

used for

remote

control

or telemetering.

In what

is known

as

tone

multiplexing,

two

or more

tones may

be

transmitted

simultaneously,

producing

unusual

sounds.

How

About

That?

One

of

our

local stations

is on

FM but

still

operates

on AM

even

though

it was

told not

to

operate

on the

AM

band

by the

FCC. Why

doesn't

its

owner

obey the

FCC?

-J. W.,

Cleveland,

Ohio

Believe

me,

the

station would

not

be operating

in the

AM

band

if it

didn't have

a license

to do

so.

Many

broadcasting

companies

use the

same

program

material,

simultaneously,

on

both AM

and

FM

transmitters.

The

FCC

now requires

FM

outlets

to broadcast

(a portion

of their

broadcast

day)

separate

(different)

programs.

Van

de

Graaf Measurements

/tow

can

I

measure

the amperage

and

wattage

of

my Van

de

Graaf

electrostatic

generator?

The

instructions

list only

the

voltage.

-T. T., Iselin,

N. I.

The

current

is

infinitesimal.

Otherwise,

the device

would

be

dangerous. While

it

might

be

possible

to measure

the current,

it

wouldn't

be

worth

the

required

investment

in

instruments.

Why

not

ask the manufacturer

who

may

have

made

the measurements

in a

laboratory?

Aero

Bander

Not for

FM

now

could I modify

the Aero

Bander

to

receive

the FM

broadcast

band?

-M.

A. F., San

Antonio,

Texas

Your

AM

radio would

not

demodulate the

FM signals.

That's

an

Iffy Question

If a spacecraft

could be

built

that

could go

faster

than radio waves,

it

could overtake

and

intercept

radio

waves

from

the

past. Right?

What

would

happen

if

the radio

signal

and

the

-C'-l

?

c

T±

C>>i_

"Did

the

man

show

up to fix

the

old

set in the

basement ?"

FEBRUARY

-MARCH,

1967

31

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