Dynatuner FM-1 Instruções de montagem Operação de alinhamento - Página 5

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tune. The eye rea<:he.s maximum closure when the tuning is

corred. and the accuracy of tuning is greatest when watch-

ing the eye, rather than trying to set to a given frequency as

indicated on the tuning dial.

The volume control of the Dynatuner has two possible

functions. If the tuner is used with a basic power amplifier,

then this operates as a conventional volume control. When

used with equipment which has a central volume control,

such as a Dyna pream}Jlifier. the Dynatuner volume control

is used merely to set the output of the tuner to correspond

with the output of other program sources so that there

no need to re-adjust the volume when switching from one

program source to another.

Normally in this usage, the

Dynatuner's volume control will be operated almost fully

clockwise, depending on the signal level of other equipment.

All tuners using vacuum tubes generate heat.

In the

Dynatuner the ('omponent parts have been selected with

this in mind. Because the tuner has been designed with the

cover as an int.egral part, the unit in effect creat.es its own

thermal environment, and adequate allowance has been

made in the design for this nonnal temperature rise. The

Dynatuner should not be used in a confined space.

should be remembered that. the heat generated is equivalent

to a fiO watt light bulb, and adequate ventilation must be

allowed above it. When used with the Dyna PAS-2, for

example, the Dynatuner may be placed on top of the

PAS-2. bulnot below it.

For most met.ropolitan area use, a very small, simple

ant.enna such as a four foot piece of wire secured to either

of the sc.rews marked 30QU, is adequate with the Dynatuner.

However, twin-lead wire is included in this kit to provide a

folded dipole antenna quite suitable for most indoor use.

Instructions for this are given in the Appendix.

In extremely difficult reception areas. it is sometimes

'- necessary to use

coaxial cable for the antenna lead-in

connection. The Dynatuner has provision for using this

type of lead-in by connecting to the center and one outer

screw on the antenna input (marked 75n on the bottom

plate).

For reception in fringe areas, high gain antenna arrays

are frequently required, and your dealer can advise you on

the use of these with your Dynatuner. The extreme sensi-

tivity of your Dynatuner, coupled with its excellent limiting

action on very weak signals, may well enable you to listen to

stations you have not received before, when this tuner is

coupled with a properly designed antenna.

GENERAL WIRING PRACTICE

Assembly of the Dynatuner is quite simple compared to

general kit assembly requirements.

Parts are out in the

open in a free and uncluttered layout so there is easy

accessibility for wiring or troubleshooting purposes. Con-

struction and alignment of your Dynatuner should not take

more than eight hours because of these simplifications.

Upon opening your kit, check the components with the

parts list. FamiJiarize yourself with the components; they

can be identified by comparison with the pictorial.diagram,

by specified color coding. and by pictorial detail.

Tools required for easy assembly of your Dynatuner are

a soldering iron (small tip) or soldering gun, long nose

pliers, screwdriver, and wire cutters. Although not essential.

a low-cost wire stripper and cutter of the type which can

be purchased for less than a dollar will g-reatly facilitate

cutting and stripping the various wires in t.he kit. A special

alignment tool is provided with t.he kit.

Good soldering technique is essential to satisfactory

rCRults from any electronic equipment. ALL SOLDERING

MUST BE DONE WITH ROSIN CORE SOLDER.

There is no warranty on any equipment in which acid

core solder has been used. Make sure that the solder is

plainly marked "Rosin Core."

you have solder on hand

the origin of which is doubtful, it is wise to obtain new

50/50 or

60/40 rosin core solder. Whencver soldering i(i

required from point to point, the assembly instructions

specify it by "(S)."

this symbol is not shown after a

connection is specified, it indicates that further connections

will be made at that point before soldering.

Soldering is accompLished by heating the joint with the

iron unt.il solder is hot enough to flow when tou(:hed to the

ioint. It is not desirabLe to feed the solder to the iron.

Solder should be fed to the junction of iron and heated

joint. After the solder flows, t.he iron should be held in

place for a few seconds and removed when it is seen that

the solder has contacted both parts of the connection .

The lug and the wire connected to it.

It should not show

a hall of solder, but a smooth transitiOIl from solder to

component lead.

When soldering a part to the etched circuit board. the

solder must completely surround the wire lead wherp it

comes through

thp

board. Do not apply excessive Ijolder, hut

do not hesitate

apply sufficient

hl'(/!

to assure a smool II

flow of solder all around

the

lead and Ollto the board.

In the case of point to point wiring. before applying

solder the joint should be clean and t.he lead should be

crimped in place for mechanical strength.

It is not neces-

sary or desirable to wrap leads around contaets many times.

A single tum and pinching together with pliers is suitable.

After soldering there shouJd be no play at the joint if the

Jead

wiggled with a pair of pliers. All soldering can be

done with a pencil type iron with a low wattage rating. A

small tip is extremely useful when working in confined

space. If a soldering gun is employed, it should be used

with discretion since thp. amount of heat available is far

more than required for !loldering light wires. You should

also be careful not to use excessive solder. The smallest

quantity of solder that makes a smooth contact between

the parts being soldered is best.

Component leads should be trimmed as they are used;

the length should be

slJ(~h

that the proper connection ean

be made from point to point without strain on lugs or

components. Most capacitors and coils used on the printed

circuit boards have pre-cut leads. The leads of the resistors

for the boards should be cut as described later. Care should

be exercised not to allow wires to touch one another unless

they are actually connected

the same point.

The instructions which follow have been arranged for

simplified procedure in which the work can be done without

interference between the various portions of the wiring.

It is recommended that the instructions be followed on a

step by step basis, checking off each step as it is completed.

The pictorial diagrams should be used for reference and all

connections checked against these before going on to the

next step. If the wiring is done methodically and each step

checked carefully, your tuner should work without difficulty

as soon as it

completed.