Epson L90P - TM Two-color Thermal Line Printer Manual do Utilizador descarregar pdf (Página 103)

IC'S

FOR THE EXPERIMENTER

(Continued from page

33)

between

J1 and the board

audio

input.

Don't forget to solder

the 1.1

tap

to the

antenna

connector. Before

installing

the

plastic

cover, drill the

access hole

for

C7.

If

the

FM receiver

to be

used is

in

the same room

as the mike, remove

any

external (rooftop)

antenna

leads

and

attach a small vertical length

of

wire

to

the antenna terminal. (Or

use

a rabbit

-

ear

antenna.)

Do not

try

to use the

wire-

less mike

with an

FM

receiver

that

has

an outdoor antenna -the

power

from

the

mike

won't

reach that far.

Using

the Wireless

Microphone.

Tune

the

FM

receiver

to

a quiet

spot on

the

dial

and,

if possible, turn

off the

a.f.c.

to

prevent the receiver from

tuning

auto-

matically

to a

strong

adjacent

channel.

Operate the talk switch (or

turn

on

S1

if you

are using a discrete

switch)

,

speak into

the

microphone

and adjust

C7 through the

hole

in the

cover

until

your signal

is heard

on the FM

set.

Adjust

R5 for

the desired volume.

If

commercial stations in

that frequency

range are

not

too

closely

spaced,

the

a.f.c. can be used to hold

the receiver

on the frequency of

the wireless

mike.

Photos in

this article show, in

addi-

tion to the wireless microphone,

other

completed projects

using

IC's.

All

are

described

in

the RCA booklet. [30}

PRODUCT

GALLERY

(Continued

front

page

81)

ception and adjacent

channels

are screened

out

by

the

sharp skirts

of the L/C i.f.

trans-

formers.

Using

pushbuttons

to select

chan-

nels, the listener

can monitor

one frequency

or

all 6 channels (provided

he

has the

nec-

essary modules

installed)

simultaneously.

And

these channels

may

be in either of

the

VHF bands or

a mix

of bands

without

de-

grading receiver sensitivity.

The Ultra

/Monitor is

lightweight

(7 lb)

and has

its own

built -in

battery supply

(rechargeable

batteries

are

optional

at extra

cost). A handle

on the

end of

the receiver

makes it easily portable

for

field use.

One

of the

new variety

of dual -band loaded

whip

receiving antennas

will provide

20

-30 -mile

reception

capability.

When used

at a base

station,

the

receiver

can

be operated

from

an

a.c. line

(automatically

recharging the

bat-

teries) or from

a

12 -volt

d.c. source.

If

you need

a really good

VHF

police

/fire

or Business

Band

receiver, you should

in-

vestigate

the Ultra /Monitor.

It's

functional

design is

unusual, combining

all of

the

portable

-fixed receiving operations

you

could

desire.

Squires- Sanders

will also provide

the

receiving

components for installing

a

tone

-alerting modification.

Circle No. 91

on Reader

Service Page 15 or 115

1969

Spring

Edition

ELECTRONIC

EXPERIMENTER'S

HANDBOOK

Now on

sale at your newsstand.

Sonar

LISTE

TO:

POLICE, FIRE,

AIRCRAFT

&

WEATHER

REPORTS!

SENTRY

VHF

MONITOR

RECEIVERS

for Industrial,

Commercial, Utility & Govt.

Use

2

CHANNELS

BROADCAST

BAND CRYSTAL

CONTROLLED

Designed and

engineered for

simplicity

of operation, compact

enough

to

fit

a shirt

pocket yet powerful

enough

to

deliver a

clear

clean signal -it's

dependable Operates

on two crystal

controlled

VHF channels

plus broadcast

band Completely

solid state for

long life

use

Visible battery indicator

to

show

battery condition

at all

times Built

in

antenna

5' /e" H x 2,4" W

x 1K," D. Wt.

11 oz.

With

Battery,

Earphone,

&

less Crystals

l

SONAR

RADIO

CORP., 73

Wortman

Ave.,

Bklyn, N.Y. 11207

Crystals

$5.00

ea.

StptE

$4995

with

squelc

adjhustable D

Please send information on VHF Monitor Receivers.

.

, n1 KlT S11

Dept. 986

Model

FR-103 I

Address

150.175 MHz

30

-50 MHz

City State

Name

April,

1969

CIRCLE NO.

30 ON READER

SERVICE

PAGE

113

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