Metra Electronics DAT Combo Manual de usuario descargar pdf (Pagina 22)

Ask

Me

Another

monitor

your

transmissions.

The

oscillator is

tuned by

adjusting its

ferrite core. An

antenna

may be

connected

to the antenna binding

post,

but is usually

not necessary

when near

a trans-

mitter.

Q- multiplier

vs:

Crystal Filter

My

shortwave

set

employs

a

1650 -kHz IF.

Would

a Q- multiplier

do any good,

and

where

can

I get one?

-R.

N. K., Morton Grove, Ill.

A Q- multiplier

is

most

effective at relative-

ly low frequencies, 455

kHz and below.

For

1650 kHz, a crystal filter can be used

to

im-

prove selectivity. It

is

inserted

at the input

of

the IF amplifier.

They

are made by several

companies, primarily for equipment manu-

facturers.

One company

near you, Nieder-

man-Sherold,

Inc.,

4302 Warren Avenue,

Hillside,

Illinois, makes a

1650 -kc crystal

bandpass

filter.

Add Noise Limiter

Can you

give me a

cir-

cuit for adding a noise

limiter

to

my National

SW

-54 receiver?

-J. L.,

Seattle, Wash.

The

original circuit

of

the

detector and first -

audio stage

are

shown

in

the upper

diagram.

Break

the

circuit at "X"

and

add

five resistors,

three

ca-

pacitors and

a diode as

shown in the lower

dia-

gram.

24

QSL

a

Satellite

Is

it possible

to

receive

satellite signals from

outer

space

on

a

shortwave

set?

If

so,

on

what

frequencies?

-C. B., Seattle, Wash.

Russian

satellites

transmit on

around 20

MHz

within

the tuning

range of most short-

wave

sets which

usually tune

up

to

30

MHz.

American

satellites

transmit on frequencies

around 100

MHz.

A

special VHF

receiver

or a converter

ahead of a

shortwave receiv-

er is required.

Mum's

the Word

I

have sent

QSL cards to ship

and marine

coast

stations I

have

heard, but have received

no verification

from them. Why

don't they

acknowledge

my reports?

-A. R.

T., Marysville, Wash.

You aren't supposed to send

QSL cards

to

any

but broadcast

and amateur stations, un-

FROM

IF

AMP_

12

1.r

L

B.

A

V3

12

AV6

RECEIVE

'STANDBY

TO AF

POWER

AMP

Z2

I 1'

Ti

T,

R7

AVC

C26

.005

FROM

IF AMP

T2

i1l- .rr

T 1

8

B

R6

R8

L

10M

V3

12AV6

RECEIVE

'STANDBY

Z2

100K

100K

560K

560K ,

R6

T

05

1N34

C27

.05

8.-

RADIO -TV EXPERIMENTER

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