Massive Audio DB8000 Manuel d'utilisateur télécharger pdf (Page 91)

THE

AMLIGNER

(Continued from page

61)

Also, the

discharge of Cl

through

the

primary of

induces

rapidly

chang-

ing voltage in

the coil. This

voltage is

stepped up by transformer

action,

plac-

ing

a potential of several hundred

volts

across

tuning capacitor C2.

Adjustment

of capacitor

determines

the

frequency

of the

r.f.,

carrier

which

is independent

of battery voltage.

Since

an antenna as well

as a transform-

er,

radiates

r.f.

energy

that

can be

picked

up on

any

nearby

broadcast re-

ceiver. The

power

radiated

is well

within

the limits

allowed by

FCC

regulations.

Construction.

The circuit

must be

housed in

non -metallic

box. A plastic

instrument case is

just about ideal for

this purpose, but you could

use a

Masonite

or wooden

case. Simply

follow the pic-

torial diagram (p. 61). Be

sure

to keep

the leads on Cl, Di, and the

primary of

as short as possible

to prevent ex-

cessive

signal

losses

the

middle

of the

band.

And, of course, observe

polarity

when hooking up

the battery and diode.

The

circuit should

perform well with

just about

any

loopstick you

care to use,

but you'll no

doubt encounter

perform-

ance

variations from

loopstick to

loop

stick. The one in

the

Parts List is

quite

suitable

for

this application.

You'll

also

find

some

performance variations in

tun-

ing capacitors, requiring

that you

cus-

tom- calibrate your own

dialplate against

the frequencies of

local radio

stations,

with the aid

signal generator.

Operating

Hints. When

using the

AM-

LIGNER, place

far away from the

receiver

as you

can

so that

it will operate

the

weakest signal

possible. This pro-

cedure will

insure

sharp

tuning.

For best results

when

making oscilla-

tor tracking

adjustments

or car radio

antenna trimmer

adjustments,

always

use frequencies at the

high end of the

dial (around

1600 kHz). Before attempt-

ing to adjust the receiver

i.f., make

cer-

tain the

AMLIGNER

has been properly

calibrated

for the desired i.f.

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INE Jt'/,

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Oveirpt

CORPORATION

43 West 61st Street,

New York,

N.Y.

10023

r The

Schober

Organ Corp., Dept. PE -22

West 61st

St.,

New York, N. Y. 10023

D Please send me Schober

Organ Catalog

and

FREE

7 -inch

"sample" record.

D Enclosed please find $2.00 for 12 -inch qual-

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Name

Address

City

State Zip No

1 2 ... 86 87 88 89 90 91 92 93 94 95 96 ... 115 116

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Massive Audio DB8000 Manuel d'utilisateur Page 91

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