Marantz 5220 Manuel d'utilisateur télécharger pdf (Page 48)

(1.9

-cm) doweling. File

six

grooves

3/8"

(9.5 mm)

apart

the

dowels,

spacing

the

outer ones 3 /e" (9.5 mm)

from

each

end. Take

a 121/4

-inch

(31.1

-cm) length

of 1/2 -inch (1.3

-cm) doweling

and drill

two

1/8

-inch

(3.2

-mm) holes

11/4" (3.2

cm) and 23/4"

(7cm)

from

one

end.

Repeat four

times.

Then, glue

the

dowels together

to form

three

T-

shaped wire

supports as

shown in

Step 2.

Save the remaining

dowel for

later

use.

Form

a cross by

overlapping the two

lengths

tubing.

Line up the

center

holes

and

secure with a 1/4

-20

inch

bolt,

flatwashers,

and wing nut.

Slide

the Tee's into

ends

and D

of the

cross until the holes

line up.

Secure

the Tee's in the

tubing with 1/4

-inch

self-

tapping

sheet

metal

screws (Step

3).

Form

four

support

braces

from

9 -inch

(23.9

-cm)

lengths

1/2"

(1.3

1.3

cm) aluminum

U- channel. Drill two

11/64

-inch

(4.4-

mm) holes

1/4" (6.4 mm)

from

each end.

Then

fasten

the

braces to the

cross by

lining

up holes

and using

6 -32

1 inch

machine

screws, flatwashers,

and

nuts.

Two lengths

of channel

should

be on

opposite sides

the

tubing at

each

juncture.

Now prepare

the fourth

Tee

center drilling

a 1/2 -inch (1.3

-cm)

hole

1/4"

(6.4 mm)

deep

on one

long

side

4 "x11/4

"x3/4"

(10.2

cmx 3.2 cmx 1.9

cm) block

hardwood

(Step 4). Drill

3/16 -inch

(4.8

-mm)

hole

7/6" (2.2 cm)

from

one end of the block for

the

center

conductor pin

J2,

SO -239

coaxial

connector. Then

drill a

3h6 -inch (4.8

-mm)

hole

9/16"

(1.4

cm)

STEP 3

away

each side

the

center

con-

ductor

hole for

two

securing

screws.

File

seven

grooves

/3"

(9.5 mm)

apart,

spacing the

HOT

END groove

5/16"

(7.9

mm) from

the

edge

the

block. Drill

1/8-inch (3.2 -mm) hole

in the

center

both the

HOT

and

GROUND END

grooves.

Then

drill a 3/16 -inch (4.8

-mm)

hole

3/6" (9.5

mm)

the

right

the

HOT

and

GROUND END

holes

on the top

(un-

grooved)

side of the

block.

Mount

sol-

der lugs

above each hole,

using No.

1/2"

wood

screws.

Referring

Step

5, prepare an

SO -239

coaxial

jack,

cutting two

cor-

ners

with

hacksaw

to fit the

hardwood

block. Solder

one end

of a

6 -inch (15.3

-cm) length

hookup

wire

to the center

conductor pin

J2,

and thread it

through

the

center con-

ductor hole.

Then

secure

the

wood

block using No.

1/4"

wood

screws, looping

one end of a 4 -inch

(10.2 -cm)

length

hookup

wire

under

the head

the

screw nearest

the

GROUND END groove. Thread

the

other

end

through

the hole in

this

groove

and attach

to the nearest

solder lug

(above

J2).

Trim

excess. Attach the

free

end

the

center

conductor wire

the

other solder lug, trimming

ex-

cess.

Glue

the hardwood

block to the re-

maining

121/4 -inch (31.1

-cm)

dowel to

form

the

fourth

Tee.

Insert the Tee

into

the remaining

corner

the

cross

(A),

lining

up the holes.

Secure

with

1/4

-inch self- tapping

sheet metal

screws. Then drill

a 3/16

-inch

(4.8

-mm)

hole

7/6" (2.2 cm) above the

bottom

the vertical

tubing (above

corner A).

rue/NS

STEP

STEP 1

/-7/12-P/4.

v.'

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--5[[EWS

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Make

the hole

slightly more than 3 /e"

(9.5

mm) deep.

Take

one

end of a 74 -foot (22.6

-m)

length

18-

-gauge

(solid

stranded,

bare

insulated

-enamel

plastic

-almost

anything will

do!)

copper wire,

thread it

through

the HOT

END hole

and

solder it to

the

HOT END

solder lug (trimming

excess). Then

tightly

wind the

wire

around the

cross,

using

the Tee

grooves

as guides

make

six turns in

all.

Thread

the free

end through

the

GROUND END hole

and

solder

the lug, trimming

excess.

Remove

the insulation

(if

any) from

the

wire near

corner A

on the fifth

turn.

Solder

one end

of a 4 -inch (10.2

-cm)

length

of hookup

wire to this

point.

Leave the

other

end

free

for

the mo-

ment.

Control

Panel

Construction.

We'll

now

assemble

the

Loop's

Control

Panel.

should be fashioned

from

4.75"

(12.1

-cm)

square

piece

1/16 -inch

(1.6

-mm)

aluminum

plate.

Physical

layout

is flexible,

but

use

Fig.

as a guideline.

Form

support

bracket from

aluminum

stock,

or use

commercial

aluminum

angle

about

21/2"

11/2" x

11/2"

(6.4 cm

3.8

cm x

3.8

cm).

Install

the

bracket

centered

along

one

side

the

aluminum panel.

Then

drill

mounting

holes

for

-239

coaxial jack

-this

should be

set back

1" (2.5

2.5

cm) from

the

corner nearest

the

notched

side

the

bracket

-and for

the

main

tuning

capacitor,

switch

Si, binding post

BP1,

and the

RCA phono

and head-

phone

jacks

(if desired).

A'JWEL7

WOOD

SCREWS

STEP

11111E70

SOCOER

LUG

S0-239

CONNEC

roe

cur

OFF

STEP

Fig. .3. Above

are

directions for constructing the

frame for the loop.

Aluminum tubing,

U-

channel,

and wood dowels are used.

Steps I to ñ are referred to

in the test.

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Marantz 5220 Manuel d'utilisateur Page 48

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