Metra Electronics DAT Combo Bedienungsanleitung PDF herunterladen (Seite 26)

Ask

Me Another

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Does

it Pay?

How can I boost

the input power

of my

5-watt,

2 -meter

transceiver to

75 watts?

-L.

B., Morton

Grove,

Ill.

Get a

linear amplifier.

Connect

its input

the output of

your transceiver

and the

antenna

to the

output

the

linear amplifier

which

should

have internal

antenna switching

facilities.

However,

you can

quadruple

your

effective

radiated power

by installing

a 6

db gain antenna

which costs less

than a linear

amplifier

and

won't

increase your electric

bill. Call

AM 2 -2903

in Chicago

and

ask for Griff.

He's

near you

and

can

tell

you

what kind to

use,

where to get

one

and for

how much.

Just

a Minute

one of your

articles

about

building

novice antenna

loader, a B &

Miniductor coil

form

was

specified.

Where can

I get one?

-D. P., Cuyahoga

Falls,

Ohio.

It is

made by

Barker &

Williamson

in Bristol,

Penna.

If you can't

find it at

your

local

radio

parts

store,

write

Mr. A. Consalvi

at B &

Carrier

for Frequency

Standard

How can

I recover

the unniodulated

carrier

from an AM

broadcast

station

so I can

use it

a frequency

standard?

-J. T. H.,

Pittsburgh,

Pa.

Rig up an

oscillator

using

a circuit

such as

the

one

shown

in the

diagram.

Place

it near an

broadcast

receiver

and tune in

a station

the

desired

frequency.

Then tune

the oscillator

the broadcast

-station

frequency

so you

will hear

an audio

beat (whistle).

Carefully

tune

the oscillator

for zero beat,

the point

where

whistle is

heard.

You'll

have it set right

you

get

whistle

when

you turn the

tuning

capacitor

either

way.

When set to

zero beat

with a

signal

known

frequency, your

oscil-

lator

will

within a few cycles

that fre-

quency.

BROADCAST-

BAND

500

OSCILLATOR

COIL

MMF

.5V "D"CELL

1G4

1H4

1H5

1H6

1MF

45V

BATTERY

9 -Volt

Battery

Eliminator

Can

you

give

me a circuit

for

AC power

supply

for

replacing

a 9 -volt

transistor

battery?

-P. C.,

Helena,

Montana

Four

IN1693

or similar

diodes,

6.3 -volt

filament transformer

and

an electrolytic

capaci-

tor,

connected

as shown

the diagram,

should

do the

trick.

The no -load

voltage should

around

9.8

volts

which

will drop somewhat

under

load.

Engineering

Takes Years

want

to assemble

a transistor

radio capable

of receiving

radio

signals

in Canada

from radio

stations

of Indo -Pak

Subcontinent,

especially

the

following:

All India,

Radio

Delhi,

Radio

Pakistan

Karachi,

Radio

Lahore

(Pakistan),

Radio

Sirinagar

(occupied

Kashmir),

Radio

Jammu (occupied

Kashmir),

Radio Jallunder

(Pan jab,

India),

Radio

Ceylon (commercial

station

operated

from

Bombay,

India),

Radio

Dacca (Pakistan)

plus

local

longwave

stations.

it is possible,

could you

please

draw

diagram

and

advise

equipment to

used to

produce a "perfect

model."

-A. A.,

Vancouver,

British

Columbia

If it

were

possible

to give

you

a diagram of

an all- transistor,

all

-wave

receiver meeting

your

requirements,

would do

so gladly.

There is

such a receiver

the market

(National)

but it

costs

than $1,000.

It probably

cost the

manufacturer

more than

$100,000

and several

man

-years to

design it.

While

could

dream

up a diagram,

there are

countless other

prob-

lems

you

would have to solve yourself.

would

cost

you

a great

deal in money

and

time

with

no assurance

of satisfaction.

As a compromise,

you

might consider

Lafayette's

11 -band

portable

at around

$160

Zenith's

Transoceanic,

ready

use.

Filter

vs Crystal

Please

don't

make fun of

the use

me-

chanical

filter

with

a "Q"

multiplier. I

have a

Hammarlund

HQ -100

with a Lafayette

me-

chanical

filter and

the results

are excellent.

Ad-

jacent

channel QRM

much

reduced and

stability

considerably

improved.

For CW

reception

cannot

be beat for

the

price.

-R. C.,

Manchester,

course

a mechanical

filter is a good

device.

But, in

a receiver

which

already

has

crystal

filter,

why add

another

one?

Since your

receiver

does

not

have a crystal

filter, the addition of a

mechanical

filter

makes

sense.

RADIO -TV

EXPERIMENTER

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