Memorex CP8 TURBO UNIVERSAL REMOTE CONTROL Manual do Utilizador descarregar pdf (Página 36)

40

antenna

system

presented

a dual

challenge, both

to the

engi-

neer, who

had

to find a suitable

solution

to the

all -steel

top

automobile,

and to

the antenna

manufacturer. who

wanted

to

make his system

the industry standard.

Since it

was

a

well

-established

fact

that the received

signal

strength

increased with

the

height of

the antenna

above the

ground,

the emphasis of

antenna

installation

shifted back

to

the roof of

the

car.

Car

-Top

Antenna

Necessity

being

the mother

of invention,

a new

device

was

introduced

for

the 1937 model year

in the

United States:

the

car -top

antenna, ideally suited

for

Turret -Top

automobiles.

Consisting

of a ` /s" copper

tube running

down

the middle of

the roof, no

drilling was

necessary to

install it.

and the car

body

was not marred

in any way.

According

to the June 1936

issue of Radio

Craft magazine,

"the antenna

can be removed

at any

time, since it is

fastened

in place

with

rubber

suction

cups,

which,

when

applied

according

to directions, will

hold

firmly

and indefinitely.

Rain

and ice

will

not

affect the operation

of the antenna,

and

the

capacity between

antenna

and car top is

usually low."

The

antenna

was

sold in kit

form, containing

all necessary

materials such

as

the copper tubing

itself, special

suction

cups. insulators,

connectors,

and

shielded

lead -in

wire

(see

Fig.

3).

In reality,

the

car

-top

antenna was

typically

no more

than a

running -board

dipole mounted

on the roof

(as in Fig. 4).

ROOF -TOP

ANTENNA

mrrnxnunuarnmruaaie

vanrrmiunrrrrnmrrrw1rrn

/ "'4/

INSULATORS

\

SUCTION R

CUPS

\

COPPER

TUBING

Fig.

3- Consisting

of a copper tube running

down the

middle

of

the roof,

no drilling was necessary

to install

the

car

-top

antenna,

and

the

car body was not

at all marred.

A

Fig. 4 -The

car -top

antenna (A) was typically no more

than a

running -board

dipole (B) mounted

on the roof instead.

Manufactured

in

the United States

by

Snyder and

Philco

under

the names

"Topper"

and "Hi -Way"

respectively,

and

by Bosch

in

Germany (shown

in Fig.

5), the car -top

aerial

was

the forerunner

of the rod

antenna.

CAR -TOP ANTENNA

Fig.

5-

Manufactured

by

Snyder and Philco

under the names

"Topper"

and "Hi- Way,"

and by Bosch in

Germany, the

car

-top

aerial was the forerunner

of

the rod

antenna.

Rod

Antenna

The first mobile

rod antenna on record was

manufactured

by Telefunken for

the

Phoenix

Tire Co. bus in

July 1926.

With

a

length

of 4 ft. and mounted on

the roof of the bus, it

was said

to "offer sound

up to eighty miles from

a

station

-

even further with

headphones."

In 1934 Phillips offered in

Europe an aerial reputed

to

be

the first rod antenna

"designed solely for car use." Across

the

Atlantic. however, Philco was

merrily

offering

another

"first" that same

year: a telescopic rod antenna.

Whatever

the case might

be as to

which

company was the

first to come up with

a

rod

antenna. it

was

clear

that

by

the end

of the 1930's

the rod antenna -also known

as

"whip,"

"bug-

gy whip"

or "fish- pole" -was

rapidly becoming the

work-

horse

of the car -radio industry.

Figure

6

shows

a reproduction of part of

a 1939 advertise-

ment by Studebaker

picturing a retractable

cowl -mounted

whip in

its collapsed position (its

full length reached 43"

and

was

adjustable from the driver's seat), while

Fig. 7 shows

several European versions

of that same year

as advertised by

Telefunken.

Fig.

6- Here's a reproduction

of part of a 1939

advertisement by

Studebaker,

picturing

a retractable,

cowl- mounted

whip in its

collapsed position.

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