Electro-Voice DB23 Bedienungsanleitung

Slecho

Voice

ELECTRO-VOICE,

INC.

BUCHANAN,

MICHIGAN

ssaeanat

wat

Schematic

Diagram

6-3-Le

Specifications

and

Instructions

RME

Model

DB23

Preselector

The

DB23

preselector

low-noise,

radio-frequency

amplifier

which

can

used

substantially

improve

receiver

performance

the

following

amateur

radio

bands:

3.5

4.0

7.0

7.3

14.0

14.5

21.0

21,5

26.0

30.0

The

DB23

consists

one

tuned

input

circuit,

which

matches

input

impedance

ohms

unbalanced

300

ohms

balanced,

followed

two

stages

low-

noise,

neutralized,

broadband

push-pull

6J6

amplifiers.

Finally,

push-pull

6J6

impedance

matching

stage

delivers

the

amplified

signal

the

receiver

with

out-

put

impedance

150

ohms

unbalanced

300

ohms

balanced.

Input

and

out-

put

impedance

values

actually

encountered

can

differ

within

reasonable

limits

without

seriously

affecting

performance.

The

voltage

gain

which

can

expected

from

the

DB23

varies

somewhat

with

the

band

use

and

the

output

impedance

selected

(balanced

output

gives

gain).

Minimum

gain,

using

balanced

output

connection,

will

about

db,

while

maximum

gain,

using

the

same

output

circuit,

will

around

db.

The

tuned

circuit

the

DB23

adds

selectivity

the

receiving

system

The

amount

image

rejection

due

the-DB23

varies

with

the

frequency,

and

can

high

the

lower

frequencies.

Because

the

DB23

low-noise

device,

improvement

signal

plus

noise-to-

noise

ratio

(or

usable

gain)

experienced.

This

feature

quite

pronounced

with

the

less

sensitive

receivers,

but

even

the

better

receivers

will

benefit.

improvement

7.5

signal

plus

noise-to-noise

ratio

not

unusual,

SPECIFICATIONS

Tubes:

6J6

R.F.

amplifier

6J6

R.F.

amplifier

6J6

R.F.

impedance

matching

amplifier

Power

Supply:

Self

contained;

uses

transformer

and

selenium

rectifier

Input

Impedance:

ohms

unbalanced

300

ohms

balanced

Impedance:

150

ohms

unbalanced

300

ohms

balanced

Gain:

(average)

Frequency

Range:

3.5

4.0

mc;

7.3

mc;

14.5

me;

21.5

mc;

me.

Size:

in.

wide

in.

deep

x 5

in.

high

Weight:

Ib,

shipping

Sleche

Voice

Specifications

and

Instructions

RME

Model

DB23

Preselector

‘The

voltage

chart

below

for

reference

when

servicing:

Band

Switch

Band

Switch

40M

80M

Position

volts

Rect,

Filter

110

All

voltages

measured

ground

with

20,000

ohm-per-volt

meter

and

are

positive.

Voltage

Chart

Warranty

TLECTRO-VOICE,

INC.

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free

from

defective

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itor

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"turned,

transportation

‘within

ninety

190)

days

from

the

date

eriginal

purchase

the

through

sur

authorized

decler

from

who

nished

us.

Accessori

this

product

are

not

cov

this

warranty.

This

waranty

tlew

all

other

werrantis

ind

for

ony

our

product.

INSTRUCTIONS

FOR

SET-UP

AND

OPERATION

SWITCHES—The

switching

arrangement

the

DB23

permits

connection

the

antenna

the

preselector

directly

through

the

receiver

when

the

use

the

preselector

not

desired.

The

input

and

output

terminals

the

DB23

are

coded

for

proper

operation

this

feature.

The

input

terminals

are

marked

and

(ground),

while

the

output

terminals

are

marked

OUT

and

Terminal

will

connected

terminal

OUT

and

ter-

minal

will

connected

terminal

OUT

when

the

bandswitch

the

“THRU”

position.

Therefore,

when

using

unbalanced

antenna,

impor-

tant

use

paired

set

terminals

i.e.,

for

antenna

input

and

the

output

should

taken

from

terminals

OUT

and

balanced

antenna

connection

used

(terminals

and

2),

important

use

balanced

receiver

input

connection

for

proper

antenna

match

when

the

DB23

set

the

"THRU"

position.

Finally,

the

DB23

will

permit

the

use

balanced

an-

tenna

system

into

unbalanced

receiver

input,

vice

versa,

but

should

remembered

that this

will

result

unbalance

either

the

antenna

receiver

input

when

the

bandswitch

the

"THRU"

position.

Because

the

DB23

amplifier,

incorrect

may

result

part

its

output

being

fed

back

into

the

input

circuits

with

regeneration

active

oscillation

resulting.

Therefore,

care

must

exercised

installing

the

DB23,

‘ound

between

the

DB23

and

the

receiver

chassis

result

very

stable

system.

Precautions

INSTALLATION

—

Connect

line

cord

117

50-60

cycle

power

source.

Connect

antenna

proper

input

terminals

DB23

(see

paragraph

switches).

For

75-ohm

unbalanced

input

use

terminals

and

For

300-ohm

balanced

input

use

terminals

and

Connect

output

DB23

receiver.

For

150-ohm

unbalanced

output

use

terminals

OUT

and

OUT

and

(note

and

are

used,

select

OUT

and

G).

For

300-ohm

balanced

output

use

terminals

OUT

and

OUT

Use

short

length

coax

twisted

pair

for

unbalanced

output.

For

balanced

output

twisted

pair

300-ohm

twin

lead

suit-

able.

Provide

good

ground

between

the

DB23

and

the

receiver.

OPERATION

—

Turn

the

"ON-OFF"

switch

(lower

right)

the

“ON”

position.

The

dial

light

should

illuminated

indicating

the

presence

power.

Turn

the

band

selector

switch

(center)

the

desired

frequency

band.

Tune

receiver

desired

frequency.

Adjust

peaking

knob

(lower

left)

for

maximum

signal.

Peaking

adjust-

ment

should

made

each time

the

frequency

appreciably

changed.

Two

positions

the

peaking

control

may

produce

peak

background

noise.

This

due

image

response

the

receiver.

Always

tune

peaking

knob

most

counter-clockwise

peak.

MAINTENANCE—The

DB23

should

require

little

maintenance.

There

are

two

basic

adjustments

which

may

made:

Trimmers

the

tuning

condenser

(C1)

which

are

used

trim

the

input

circuits

the

proper

frequency

coverage.

These

need

only

checked

coils

are

replaced.

They

are

adjusted

give

proper

frequency

coverage

the

3.5

4.0-mc

band.

The

neutralizing

condensers

(twisted

wires

C3, C4, C7,

and

C8)

are

used

keep

the

triode

stages

from

oscillating.

Should

oscillations

occur,

first

check

the

antenna

and

receiver

connections

as_well

the

bond

the

DB23

chassis

the

receiver

chassis.

oscillation

persists,

remove

the

DB23

from

its

cabinet

removing

the

knobs

and

the

rubber

feet

the

bottom.

Then,

adjust

each

twisted

wire

condenser

twisting

unzil

oscil-

lation

stops.

Finally,

check

each

band

frequencies

and

readjust

twisted

wire

condensers

necessary.

Usually

one

adjustment

the

30-mc

band

sufficient

(new

tubes

are

the

most

likely

cause

for

adjustment).

RADIO

MFG.

ENGINEERS

DIVISION

ELECTRO-VOICE,

INC.

BUCHANAN,

MICHIGAN

Part

No.

53144

Printed

U.S.

‘1

AWW

Wat

TIW0d-LEI

Schematic

Diagram

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