Eddystone Short Wave Manuale utente

ULT&' E

amil-0 TtJE PHCNE

THE,:)rdmary broadcast side of wireless on

the medium and long waves under existing

circumstances, has :ost much of its early appeal

.. .to the real radio enthusiast. This is due to the range

of these wavelengths being limited and the general

reception conditions a known quantity.

Short wave radio, on the other hand, offers the

World as a field for Nception with that unknown

factor, the ether, to add to the thrill of the game.

Further, on the ultra short waves, which are coming

into greater prominence and exists a whole

Held for t-4titiine experiment at present comparatively

unexplored.

We hope that this third number of the Eddystone

Short Wave Manual will prove of help and interest to

those who wish to join the ranks of radio enthusiasts

who find this the most interesting side of wireless.

Stratton & Co. Ltd.,

Eddystone Works.

Bromsgrove Street.

BIRNANGHANI 5

aft

(VoJ

EDDYSTONE

SHORT WAVE MANUAL

CONTENTS Pages

The All World Two 2 to 7

The "Everyman" Short Waver 8 to 11

Short Wave Aerials 12 to 14

5 Valve A.C. Short Wave Superheterodyne Receiver 15 to 19

Self Modulating Oscillator 20

A Four Band Transmitter . . 21 to 23

5 Valve Short Wave Super -Heterodyne Receiver, Battery Model 24 to 27

Ultra Short Wave Radio Telephone ..28 to 32

A Modulated Oscillator 33

One Valve Short Wave High Frequency Amplifier or Short Wave

Converter 34 to 38

Solder Your Wireless Set 39

Two Valve Transceiver 40 & 41

Absorption Waveme ter 42

Wavelength or Frequency 42

Valve Bases 413

Short Wave Broadcast Stations 44

2EDDYSTONE SHORT WAVE MANUAL

THE ALL WORLD TWO

15.5 TO 52 METRES.

A POWERFUL 2 VALVE SHORT WAVE BATTERY RECEIVER

WITH BANDSPREAD TUNING.

The set has a smart

front appearance ----

The Eddystone All World Two receiver

is designed to give adequate world wide head-

phone reception with a minimum expenditure.

It is the outcome of considerable research in

our laboratory and during extensive tests

results were highly satisfactory ; America,

Australia and other long distant stations being

consistently received with good volume and

quality.The set is inexpensive and easy to build ;

simple to operate and has small current

consumption. It is equally suitable for short

wave broadcast or amateur band reception

since it is fitted with the special Eddystone

Bandspread Tuning unit, which allows contin-

uous bandspreading on all wavebands. The

waverange covered by the two coils supplied

with the receiver is 15 to 52 metres, but if it is

wished to receive on intermediate bands

between 50 and 200 metres, extra coils are

available and no structural or wiring alterations

necessary.

There is a high degree of sensitivity com-

bined with low noise level, and careful design

of the aerial input circuit has completely

eliminated tuning blind spots. Constant and

smooth reaction has negligible effect on tuning

and complete stability of handling is assured.

A rigid die-cast chassis houses the component

parts and provides ample screening.

The theoretical circuit embodies a screened

H.F. Pentode valve followed by an audio

stage which can use either triode or pentode

valve as desired. The aerial input circuit,

although simple in design, was only satis-

factorily developed after protracted experi-

ments on many different types of aerials.

It ensures complete freedom from tuning

blind spots, thus saving the extra cost of an

H.F. stage which is the generally accepted

medium for overcoming such trouble. Re-

generation is obtained by a modified Reinartz

circuit, feedback current being controlled by

varying the S.G. voltage with a potentiometer.

The high tension battery is suitably isolated

to prevent current leakage through the

potential divider circuit.

CONSTRUCTION.

Proceed as follows :

The sockets for the aerial and earth and

'phone strips should be mounted and the strips

finally screwed on the back of the chassis by

the " 6BA roundhead screws provided.

All holes in the chassis marked " E " on

the practical wiring diagram must be carefully

scraped above and below the chassis as earth

connections are made at these points.

Mount the 1+1 mfd. condenser on the

front of the chassis with countersunk screws,

and fix the two valveholders and coil base in

position. Do not forget the soldering tags "E"

under some of the fixing screws.

The reaction trimmer is now mounted in

its appropriate fixing holes. The reaction

potentiometer, on -off switch and tank con-

denser should be assembled on the chassis,

the panel and 0-10 scales fitted, and the panel

held in position by the switch, condenser and

potentiometer fixing nuts.

To ensure absolutely noiseless reaction

control the specified variable potentiometer

should be used.

and a tidy,

attractive chassis lay out.

EDDYSTONE SHORT WAVE MANUAL

ALL WORLD TWO-continued

The tank condenser spindle should be

turned until the moving plates are fully out

of mesh with the fixed plates and the pointer

knob fixed opposite the 0 division on the scale

by screwing up the small grub screw. By

turning the knob clockwise, the condenser

will rotate in 10 steps up to the maximum

capacity.

Turn the reaction spindle as far anti-

clockwise as it will go, and fix the pointer

knob so that the pointer is placed at the posi-

tion which the small hand of a clock points

to at eight o'clock. :

It is advisable to leave the tuning con-

denser off the panel until all the wiring is

finished. This enables the chassis to be

mounted upside down on the edge of a table

to facilitate wiring. Wires Nos. 9 and 10 may

be connected at one end, but the free ends

left until the rest of the wiring is completed.

Certain condenser and resistances not

already assembled are automatically supported

by their connections, so the wiring may now

be commenced, and should be carried out

without difficulty with the aid of the wiring

plan on centre pages and point to point

connection list on pages 4 and 5 overleaf.

VALVES.

The kit has been designed around the

Mullard SP2 Screened Grid andllazOa`sP32.9

Triode valves. The constructor may use any

of the two other triode valves specified or

alternatively one of the three pentode valves

listed below.

The average total number of milliamps

for any of the pentodes or triodes are given in

the right-hand column below, from which

it will be seen that the use of the pentode type

of output does not increase the consumption

of the receiver, but does in practice consider-

ably add to the signal strength.

A five -pin valveholder is fitted in the

output stage, the centre pin automatically

connecting the auxiliary grid to the H.T.

supply when a pentode is used.

An automatic bias resistance. is incorpor-

ated in this receiver, and it has been dalculated

to be equally suitable for the following output

valves : Total_ Milli -

(a) (b) amps with

TRIODE PENTODE Detector Valve

VALVE (7;-) VALVE (13/6) (a) (b)

Mazda P220 Mazda Pen. 220 4.5 4.8

Osram LP2 Osram PT2 4.55 5.1

Mullard PM2A Mullard PI1122A 4.55 3.95

RESISTANCE COLOUR CODE.

Resistance Body Tip Dot

CONNECTING UP.

Place the desired Coil in the coil base, a

Mullard SP2 Valve in the first valveholder V1,

and the appropriate Output VAlve in V2.

40,000 ohms Yellow Black Orange Use a pair of 2,000 ohm headphones in

100,000 ohms Brown Black Yellow the 'phone sockets and connect.- aerial and

I meg. ohms Brown Black Green earth leads. Put the on -off switch in the

3 meg. ohms Orange Black Green " off " position (turned left) and connect up

1,000 ohms Brown Black Red the H.T. and L.T. batteries.

V.4150

570, 140 sofq

000 W.

TUNER

100,000 CA.

002,a0d.

V I

40 00011.

THEORETICAL CIRCUIT.

PHONES

1ooapPd.

H:r+

000

SWITCH

o H77.-

LT.-

o LT. 4-

WIRING PLAN

UNDER

CHASSIS

TUNING

CONTROL

ON -Orr

Gwvrc.

TAN K

CONDENSER

50,000 SI-

REACTION CONTROL.. ALL WORLD TWO

313 40,000 .fL41-

To IMMCR

TERM.TOP

F. I*

POINT TO

Too -re R 1,4

10 Top

C AP

orVi

0001 add

POINT CONNECTIONS.

The following Point to Point Connections arc necessary :

1-One end of Aerial Trimmer to Aerial Socket.

. 2-Other end of Aerial Trimmer to Socket No. 3 on Coil Base.

3-Socket No. 6 of Coil Base to Soldering Tag E.

4-Socket No. 4 of Coil Base to Soldering Tag E.

5-Earth Socket to Soldering Tag E.

6-One end of .0001 mfd. Condenser to Socket No. 1 on Coil Base.

7-Other end of this Condenser to Socket No. 2 011 'alveholder VI.

8-End of .0001 mfd. Condenser to Top Terminal (Fixed Plates) of

Tank Condenser.

9-Top Terminal of Tank Condenser, through hole A in Chassis, to

Fixed Plates of Tuning Condenser.

10-Moving Plates of Tuning Condenser to Soldering Tag E.

11-Bottom Terminal (Moving Plates) of Tank Condenser to Soldering

Tag E.

12-Socket No. 2 of Coil Base to Soldering Tag E.

I3-Socket No. 5 of Coil Base to Reaction Trimmer.

ARTe4

AERIAL

1-OiNtINICe

14 ---One end of 3 megohin Leak to Socket No. 2 of Vt.

15 --Other end of Leak to Socket No. 5 of VI.

16 --Socket No. 3 of VI to Soldering Tag E.

17 --Socket No. 4 of VI to Soldering Tag E.

18-Socket No. 5 of VI to Filament Socket of Valveholder V2.

Socket No. 6 is left free.

19 -Socket No. 1 of VI to Soldering Tag E.

20 --Socket No. 7 of VI to One Terminal of I 4-1 mid. Condenser.

21-Same Terminal of Condenser Block to Middle Tag of Rc u.tion

Control.

'22 --One end of 1000 ohm Resistance to other Terminal of Condenser

Block.

* 23-1 megohin Leak to Terminal of Condenser Block.

'24 ---Remaining end of 1000 ohm Resistance to Bottom T, f On -Off -

Switch.

25 --Tag of Ott -Off Switch to Soldering Tag E.

. 26-Remaining end of I megohnt Leak to Grid Socket of V2.

WIRING

PLAN-

CHASSIS

TOP

ON ES

CART0-4

Ac. 0

EILAcK

RED

L7r

L'r

ItATTERY LEADS.

The end of the battery cable should be stripped of its braiding for:

about G inches and the leads Placed through the hole in the hack of chassis

and wired up :is follows :

LT.+ (Rod) to No. Socket of VI.

LT. (nine) to Top Tag of OrtOff Switch.

11.T. (White) to A-- 'Phone Socket.

11.T.-- (Black) to Condenser Block.

The end of the braiding tuay be bound with twine to make a neat

ending.

T -R ?AMER .

FIxeo

PL Arcs

10 To OViNG

L-77.071re,

To FIXED PL A -rcS or

Conoemscp.

ALL WORLD TWO

Point to Point Connections-cont'd.

*'27 One end of .002 infd. Condenser to Grid Socket of V2.

.28. Other end of this Condenser to Reaction Trimmer.

20 Same Connection of Trimmer, through B'in chassis, to Top Cap

*30 One end of 100,000 ohms Resistance to-same:Side of Trimmer.

* 31- Other end of 100,00(1 ohms Resistance to + 'Phone Socket.

:32. - End Tag of Reaction Control to Soldering Tag E.

.33 Tag of Reaction Control to 40,000 ohms Resistance.

34- -Remaining end of 40,000 ohms Resistance to Connection No. 31.

3,5-- Filament Socket of V2 to Soldering Tag E.

36 Centre Socket of V2 to Connection No. 31.

37 Anode Socket of 1'2 to -- 'Phone Socket.

. 3t3 - One end of .002 infd. Condenser to Anode Socket of 1'2.

*:39 Other end of .002 infd. Condenser to Floss E.

No wire is necessary on these connections as contact is auto-

matically made by the tags or wire ends of the components concerned.

.6 EDDYSTONE SHORT WAVE MANUAL

ALL WORLD

OPERATION.

Unscrew aerial trimmer to nearly mini-

mum capacity and put tuning dial at 0°

and the tank condenser at position 0. Switch

on by turt*ig the switch to the right, and

adjust reaction trimmer until a faint rushing.

sound is hard in the 'phones when the

reaction control is turned three-quarters of

the way clockwise. It will generally be found

that the reaction trimmer has to be screwed

fully clockWise for correct oscillation. Stations

may now be tuned in. Leaving the tank

condenser at 0, turn the tuning dial from

0 to 100 degrees, keeping the set just off

the verge of oscillation for telephony and

weakly oscillating for 'GMT. signals. Stations

will now4e heard. Turn tank condenser

to No. lliositio'n and again tune from 0

to 100: deg*ees; and so on until the whole

10 positions of the tank condenser have been

explorftd; -The receiver should not be calibrated

until the optitnium setting of the aerial

trimmer has been found. Proceed likewise

with other. coil.

TWO-continued

For the best results with any aerial, the

aerial trimmer screw should be turned half

a turn clockwise at a time until a blind spot

is found on one of the two coils. Then reduce

the setting of this condenser until the blind

spot disappears. This position will give maxi-

mum selectivity ,and sensitivity. In short,

use as much capacity as possible for the aerial

trimmer, consistent with freedom from blind

spots. The set may now be calibrated, but

the aerial trimmer should not be re -adjusted

again since this would alter calibrations.

To achieve maximum efficiency however,

alarger value condenser (our Catalogue

No. 1013 being quite suitable) may be used

in place of the aerial trimmer. Blind spots

may be prestnt but can usually be moved to

a part of the band which does not matter. If

this alteration is made the wave range charts

on page 7 will not apply.

If no signals are heard, check the receiver

with a milliammeter and a voltmeter. The

following voltages and currents should obtain

with 115 volt H.T. supply :

SP2-Anode Current (approx.) 0.25 m.a.

knode Voltage 90 volts.

P220-Anode Current 3 m.a.

Anode Voltage 115 volts.

Potentiometer Current 1.25 m.a.

Total Current 4.5 m.a. at 115 volts.

These figures are for an average kit and

will vary slightly for individual receivers.

CONTINUOUS BANDSPREADING.

Tuning is accomplished by means of two

parallel condensers. The band required is

selected by the large condenser which is

variable in ten equal steps only and is called

the tank condenser. A small vernier condenser

slightly larger in capacity than the capacity

difference between the steps on the tank

condenser, is used for final tuning.

Suppose the coils were tuned in the normal

way with a .00016 mfd. variable condenser.

Then the 6LB coil would tune from approxi-

mately 19,350 kc/s. at 0° on the dial to

10,100 kc/s. at 100°. Thus, a frequency

bandwidth of 9,250 kc/s. is obtained by

turning the condenser through 100 degrees on

the dial. With the bandspreading system

employed in this receiver the band required is

selected by putting the tank condenser knob

on, say, No. 5 position, and the small tuning

condenser then tunes a frequency bandwidth

of only 855 kc/s. approximately, as the dial

is rotated from 0 to 100 degrees. Since we

have only covered a 1/10th of the previous

waveband tuning is ten times as easy as with

a normally tuned receiver. As the tuning

condenser has a 9 : 1slow motion head in-

corporated in its movement, it will be

appreciated that tuning difficulties are stig

further decreased.

To give the constructor an idea of

how the various bands are " spread " the

curves on page 7 were taken on a specimen

receiver. These show the effect of bandspread-

ing, the numbers on the curves indicating

the position of the pointer knob on the

tank condenser, while the figures on the

horizontal line refer to the degrees on .the

tuning condenser dial.

It will be seen that the 14 megacycle

amateur band is " spread " over 40 degrees

on the 6LB coils, while the 6Y coil brings in

the 7 megacycle band over SO degrees on the

dial. These figures c!early show why this

receiver is suitable for amateur reception.

The overlaps between the various settings of

the tank condenser have been designed so

that no stations will be missed.

EDDYSTONE SHORT WAVE MANUAL 7

ALL WORLD TWO-continued

COIL 6LB.

2 0000

19,000

8,000

,-;i 7,000

16,000

15,000

14.0o0

3 15,000.

L12,000

11,000

oosmo

RANGE.

a3456

O'50' 100'

TUNING CellOiNSER SCALE.

Waverange : 19,350 Kc/s - 10.100 Kc/s.

(I Sm.-29-7m.)

I Z,000

61,000

Z 10,000

9.000

8.000

7 .000

it. c.000

5.000

NOTE:

Com 6Y.

RANGE.

6810

50' 100°

TUNING CONDENSER SCALE.

Waverange 11..350 Kc/s-5.6S0 Kc/s.

(26'45m.-527 m.)

It must be emphasised that the curves

shown are for an average receiver and are

drawn to give the listener some know-

ledge of the wavelengths covered by each

position of the tank condenser. In-

dividual receivers will vary somewhat,_

due to different valve and circuit capaci-

ties, and the effect of aerial load,

although minimised in this receiver, will

influence the wavelengths covered to a

small degree.

AS S.W. ADAPTOR.

This receiver provides an efficient

alternative to the super -het type of short wave

converter. Its output can easily be connected

to the pickup terminals of a broadcast receiver

by a 1-1 transformer.

EDDYSTONE PARTS.

1 6 -pin Low Loss Coil, type 6LB Price

16 -pin Low Loss Coil, type 6Y .. 4/-

1 Patented Tank Condenser with Knob and

Graduated Dial Plate, Cat. No. 1042 6/-

1 Bandspread Condenser Unit with Slow

Motion Head, Knob, Dial and Cursor,

Cat. No. 1043 6/6

1 Short Wave Mica Trimmer Condenser, Cat.

No. 1023 .. 1/-

1 Low Loss Valveholder, Cat. No. 954 1/-

1 Low Loss Valveholder, Cat. No. 964 1/3

1 Low Loss Valveholder, Cat. No. 985 1/4

11 x 1 mfd. Fixed Condenser 4/-

1 Aluminium Die -Cast Chassis, drilled all

necessary holes, finished inside and

out battleship grey cellulose 12/9

1 Burr Walnut Bakelite Panel, drilled neces-

sary holes .. 2/9

2 Bakelite Terminal Panels .. 6d.

1 Scale and Pointer Knob, 11" dial 1/-

1 Special 50,000 ohm Variable Potentiometer 5/-

1 Welded Steel Cabinet, finished dark crystal-

line brown, Cat. No. 1061 9/6

MISCELLANEOUS PARTS.

170/140 m.mfd. Trimmer Condenser

13 -point Switch

2 Dubilier Condensers, .002 mfd.

1 Dubilier Condenser, .0001 mfd.

1 Erie Resistor, 1,000 ohms, 1 watt

1 Erie Resistor, 40,000 ohms, 1 watt

1 Erie Resistor, 100,000 ohms, 1 watt

1 Erie Resistor, 3 megohm, 1 watt

1Erie Resistor, 1 megohm, 1 watt

Length 4 -way Cable ..

4 Clix Parallel Plugs and Sockets (2 red and

2 black)

1pair Clix Spades, red and black

1pair Clix Wander Plugs, red and black

Valves. Mullard SP2

Output valve as detailed in instructions

(Triode or Pentode).

Connecting Wire, Screws, Tags, Nuts, Thimble

Clip, etc. ..

Approximate Total Cost of Complete Kit, 67/6

(less valves).

ADDITION OF H.F. AMPLIFIER.

The performance of the All World Two

can at any time be extended by the use of the

H.F. amplifier unit described on page 34.

In this case the output of the amplifier should

be connected to end 1 of the grid coil in the

All World Two. If a common battery supply

is used, note special remarks in H.F. amplifier

article, otherwise automatic G.B. of All World

Two will be shorted.

EDDYSTONE SHORT WAVE MANUAL

THE "EVERYMAN" SHORT WAVER

A 4 -VALVE BATTERY RECEIVER WITH BANDSPREAD TUNING.

1 5 - 1 00 METRES.

Here is a specially designed short wave

receiver which is simple to construct and

relatively inexpensive. An ideal set capable

of giving loud speaker results that will satisfy

the ardent short wave enthusiast.

The circuit has been based on that of the

Eddystone " Kilodyne Four," a set which

has already achieved a world-wide reputation

for performance and reliability. The patented

method of bandspread tuning makes the

receiver easy to handle and facilitates the

thrill of world-wide reception on the short

wave bands. The circuit consists of a high

frequency amplifier, detector and two low

frequency stages. It is free from " blind

spots " or hand capacity, and has smooth

and gentle reaction control. The set does not

re -radiate and can be used without any inter-

ference to the general domestic receiver.

CONSTRUCTION.

The wiring plan and point to point con-

nection details make this quite straightforward.

It is best to proceed as follows :-

Make up panel and baseboard as shown

in sketch on page opposite. Only simple

tools are needed and plywood will be most

suitable. The chassis or panel can, of course,

be polished to suit individual choice. A

metal panel is not recommended, it may cause

hand capacity. The assembly comes next ;

but first for ease of wiring, it will be advan-

tageous to tin or give the connecting points

a coat of solder before parts are fixed in place.

Lay out components as shown in wiring

plan and proceed to fasten them down.

It should be noted that the coil base and valve-

holder of V2 are mounted on insulating pillars.

When fixing variable condensers to panel

take care to bed down squarely otherwise

pointer may foul panel.

Make sure in the wiring that all joints arc

strongly made. One poor or high resistance

joint can adversely affect the set's performance,

or alternatively may give the set a very high

background noise level whith is most unde-

sirable.

Baseboard view showing general lay out

of components.

BATTERIES.

A 2-irolt low-tension is needed, the Exide

D.F.G. or larger capacity being suitable.

High-tension should be a minimum of 120 volts.

This can, with some advantage to quality, be

increased to 150 volts. The grid bias battery

should be 4i volts. G.B. - 1 from the 1 meg.

leak goes to the 1volt tapping, G.B. - 2

from the transformer to 3 or 44 volts according

to anode voltage used. L.T. current is .55

amperes and H.T. 12. m/a at 120 volts. On

the battery leads there are two spade con-

nections to L.T. battery and two wander

plugs for H.T. battery.

TRYING OUT AND OPERATING

THE SET.

Insert a coil, and then starting with both

tuning, tank, and reaction condenser at

minimum, switch on the receiver. Increase

the reaction control slowly by means of the

vernier knob until at a certain point the set

will begin to oscillate ; this will be noticeable

immediately, since a low " rushing " sound

will be heard. Throughout the whole tuning

operations, this reaction control should be so

adjusted that the set is always only just in the

oscillating condition. The reaction control

should never be turned any more than is

ticessary for the first reaction sound to be

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