THE SUXDAY OREGONIAX, PORTLAND, OCTOBER 8, 1922
BUILD YOURSELF RADIO OUTFIT AND GROW YOUNG AGAIN
Knowledge of Electricity Not Necessary for Construction of Simple Set That Will Bring in Broadcasts From 10 to 15 Miles Putting Wires, Copper Posts and Piece of Mineral Together One of Joys of Life, j
D
BY SAUL EMANUEL.
O TOTT want to stow young
.again?
A foolish Question. Who
doesn't? Well, then, here's the recipe.
Build yourself a radio set and you
will taste once more the Joys of
your boyhood's Intense interest In
cjung-s.
vhat do I know about elec
tricity?" yap will ask. You won't
save to know much about the won
der) of electricity to build a simple
tet that will bring in broadcasts
from 10 to IS miles away.
Yon don't know why the gas en
Fine of your automobile sends It
along the highways, yet you run
ens machine ana run it well.
You can easily build a radio set
mad run it well, and you won't have
to get too deep Into technicalities to
do it. There is no great mystery
about radio. Of course, there are
certain fundamental principles con
cerning it, as is in every art. Any
one can learn these easily.
Radio is no new art. For many
years thousands of boys and men
have been devotees of the fascinat
ing science. The greater part of
them bu'lt thejr own sets. Many of
them became experts- and are now
among the leaders in the radio field
today.
The advent of broadcasting
brought the attention of the public
to radio and the ranks of the ex
perimenters increased rapidly until
they now number in the hundreds of
thousands whereas a year ago they
were only In the few thousands.
There is latent in every man the
creative instinct. Where is the man
who hasn't at some time of his life
tinkered with a couple of dry cells
and an electric bell or a tiny motor,
or anything else with wheels or
wires? If he has never known the
oys of such experimenting he
missed something that was worth
while.
One of .the main reasons why
radio has taken such a hold of the
publio is because it gives one the
opportunity to satisfy the creative
instinct. .
To make a thing alive from out
of a few turns of wire, some copper
posts, and a piece of mineral, is fas
cinating work. And when you have
made your set. you still have some
thins to "fool" with, dials to turn,
wires to connect in various ways, all
sorts of tmngs to experiment with.
If you are bored with life, build
a radio set, and you will be sur
prised how your outlook on things
in general will rreshen up.
Don't get the idea that radio
broadcasting is only a temporary
iaa. urbanizations which are per
forming the services of sending out
into the air musical concerts and
other features are not going to shut
down tomorrow or the next day.
They are going to improve the
auality and type of the matter sent
out to the public. That little set
you made yourself will soon mean
a great deal to you in every way.
RADIO HELPS INTELLECTUAL
BACKGROUND OF COUNTRY
Problems Are to Simplify Receiver and Prevent Confusion of
Broadcast Messages, Says Writer.
R'
I ADIO as the means of bringing
to the citizens of the United
States inspiring music, the
uplifting words- of great teachers,
the everlasting principles of our
political fathers, is made the key-
. note of an article written by Majo.r-
General George O. Squier, chief of
the signal corps, in the October
sue of Popular Radio.
"Radio will bring to the people
of this country the intellectual back
ground which heretofore only the
rich could afford," writes General
Squier. "Yet, the work of the radio
engineer has only .just begun. Soon
we will be measuring culture by
watts."
Two things are necessary, in his
" opinion, to make radio a tremendous
system for the education of all the
people. The radio receiver must he
simplified and the present confu
sion of broadcast messages, the
overcrowding of the ether, must be
avoided. Both of -these improve
ments can be made easily, he de
clares. "The bureau of standards has pro
duced a vacuum tube equipment;
which works on an ordinary electric
lighting circuit. This may eliminate
from the radio set the present type
of battery. The prlnoiple of the
resonance coil developed in the lab
oratories of the United States sig
nal corps not only accomplishes
the virtual elimination of static, but
reduces the laborious and uncertain
tuning to a single operation, to the
mere sliding of a contact arm along
a coil. These two advances remove
the main reasons why the present
day radio set is overcomplicated and
is too hard to msfnage and adjust.
The next step is to get rid of the
aerial. This can be done by using
the electric wire or the telephone
wire."
All the electric and telephone
wires of the country form vast net
works which pulsate every Instant
with all the potential changes due
to every wireless message passing
through the ether, according to the
head of the signal corps.
"Why not forget about your own
private aerial and use those already
available?" he asks.
"With proper apparatus there Is
no danger to or from the wires, no
interference with their use for light
or telephone service. All the mu
tion, comes into your house, anyway,
through the two avenues, namely,
the light wires and the telephone
wires. The radio set of the future
I believe, of the very near fu
ture will be some simple appara
tus, which you can plug into anj
light socket or connect to any tel
ephone. It will be something which
you can. buy in any drug store. It
will be something dependable and
standard, 'which you do not have
to 'set up' or 'install.'
"When we get this we can begin
to count on developing an intelli
gent, well-meaning and broad
minded public opinion.
"The difficulty of an overcrowded
ether can be met with equal ease.
The work of the signal corps on
carrier current radio or "wired wire
less, is well known. By this sys
tem radio waves can be sent over
ordinary wires. This is already in
use for telephone service over power
or telegraph wires and for super
posing two or more telephone con
versations on the same wire.
"By the use of this system any
thing could be broadcast over the
electric light wires of a city. Items
of local Interest only need not be
loaded on the ether for everybody
to hear; the local wire systems will
carry the load instead.
For instance, department store
advertising is of real interest to
people who live near- the store. It
is not of interest to listeners a
thousand miles away. It will be
necessary to distinguish between lo-c-1
news and general news; be
tween local civic matters and gen
eral governmental ones. The use of
the local wire systems for broad
casting by radio permits one to
make this distinction effective.
BIG BUSINESS FINDS RADIO READIEST,
SPEEDIEST MEANS OF COMMUNICATION
Service Which Defies Weather Conditions Being Adopted by Large Concerns and Extensions in AH
Parts of Country in Near Future Are Predicted.
r n - . sett
liiiiiiiiiiiiifc
' 4 i - f t $ v.--' J
Broadcasting Information for use. In the industrial world la now a regular service of the department of ton-
merer. Official In department of commerce giving out information Iron Bout America for motor car
manufacturers '
B
IG business is beginning to rely
on radio as a rapid means of
communication which defies all
weather conditions. Already several
large companies with factories- in
various parts of the country have
established stations and many others
are planning to install radio equip
ment in the near future.
Hadio telephony has proved to be
more rapid than correspondence and
less expensive than wire telephony
over long distances.
Not very long ago a teex was made
in which a message was sent across
the continent both by radio and wire.
It was found that the radioed mes
sage arrived at its. destination a
good deal sooner than the one tele
graphed. -
With the new developments al
ready made in apparatus and others
certain to come, the day will soon
be here when the president of any
large company will sit in his own
office and direct by word his vari
ous factories in different parts of
the country.
Another important role which the
radio is playing in the Industrial
world is the distribution to the va
rious industries of information re
garding markets and trade condi
tions. There is now a regular
daily service and is broadcast by the
department of commerce from one
of the large government stations.
An example of what this means to
the Industries wa shown in the re
cent broadcast of information from
South America to the manufacturers
of American motor cars. The in
formation received by the motor
car manufacturers was of such value
that it brought large foreign orders
to them.
Set Should Be Examined
Before Setting Up.
Pan Must Waton for Loose Wire
Hanging From Terminals,
IF YOU'VE neglected your radio
set during the summer months,
and are now getting ready to listen
in to the winter programmes, it will
behoove you to look the set over a
little before you connect things.
If your set Is an enclosed cabinet
type and was laid away before you
left, without removing the tubes,
the latter should be carefully ex
amined. Perhaps the filaments wera
broken during your absence by
some jar or blow.
Another thing to look for is loose
wires.
If you find any wire hanging
loosn from- its. terminals and you
don't know how to put ttack. It
-" . - l wouia oe oest to reier iu sotus uuut.
Three developments in radio are J of instructions or have an expert
proiiueo.e. tae ee"- look the set over. If the connec
tions are not replaced to the proper
near at - hand
eral. They are
First The simplification and
standardization of the receiving set
Second The use of light and tel
ephone wires as aerials for every
body. Third The use of local power
systems for local broadcasting.
"Through these three develop
ments there will come to every
man's home a stream of the best
things of the world a stream to be
tapped and enjoyed when he wishea
to be shut off by the simple turn
of a switch when he does not; a
sio and speech, which is pulsating stream out of which he may select
through the ether, all this wonder- what pleases his fancy or meets
ful potential background of educa- his changing needs."
will collapse. This is easjly done
when the plate is the outer wall of
the tube, for it can be put Into a
tank of water which circulates
through a radiator. The tube is
then water-cooled just like an au
tomobile engine.
This sounds easy enough. The
real difficulty was to make the
whole tube airtight and to get the
wires for the filament and grid into
the tube while keeping them insu
lated against about 20,000 volts.
After much study the problem was
narrowed down to finding a way to
moke an airtight joint between the
heavy copper tube which forms the
"plate" and the glass of the upper
part of the tuhe, and to bring the
heavy wires through this glass.
Ciedit for the answer Is due to W.
G. Houskeeper, a Western Electric
engineer, who discovered a way to
seal copper to glass which would
make an airtight joint that would
not crack at any ordinary working
temperature.
One of these big tubes stands
three feet high and is 8 inches in
diameter at the bottom. To heat
the filament, for which in radio
receiving tubes a single dry cell or
small storage battery is enough.
Amateur Plays Big Part in
Radio Development.
General Pnblie Does Tfot Reallne
Valne to Nation Sclenee Owen
Nnek to Group,
Ihga. so that In event of an accident
the rescuers could communicate with
them. If this problem la satisfac
torily solved, the experts will then
try to devise a small compact trans
mittlnsr set for the minora, mo that
they could advise their rescuers Just j
where they were iocaiea in obot w
accident.
The latter problem will an ex
tremely difficult one to solve, be
cause the set must not only be com
pact, but it must be devoid of any
sparking contacts that might unite
the gases in the mine. Such small
seta as these would have to comprise
a vacuum tube transmitter, probably
in the order of five-watt set. They
would have to utilise some form of
dry cell high vol tare batteries for
the plate circuits or tne iuds, as n
would not be feasible to run high
voltage generators In the workings,
e
NEW YORK, Oct. 7. A wireless
broadcasting station of the latest
type has been installed at police
headquarters in this'clty, and witnin
a few months the police boats, polloe
inspection district headquarters and
stations will be equipped with re
ceiving seta, so that they may obtain
early information on stolen automo
biles and crimes and criminals. The
police department has received the
special permission of the departmen
of commerce through Secretary
Hoover to operate on a special wave
length of 400 meters, a band not
allocated to anyone else, so that
there will be no Interference what
ever with the police broadcasting
station.
NEW METHODS ELIMINATE
USE OF STORAGE BATTERY
Receiving; Set la Worked Direct From F.lertrie Wires bat Frw
Amateurs Have Had Sue cms With Plan.
RADIO QUERIES AND ANSWERS
binding post, you may soon run into thi? tube used 6000 watts. For the
trouble. Guesswork when wire plate circuit, instead of the familiar
connections are made is exceeding- j "b" battery, a high voltage direct
ly costly. " (current generator is used, or an
Another possibility of trouble jfelternating current rectifier,
lies in either the A or B batteries. The significance of these big
The storage battery should not have ! tubes is that only a very few would
been left for over a month unless ' be necessary to operate even the
care was taken to see that the largest radio stations now in serv
charge did not drop below a certain iCP. The combination of vacuum
point. tube and its current supply, it Is
Most owners of radio sets, it expected, will be less costly, more
seems, look upon the storage bat- I rugged and more easily adapted to
tery as a sturdy piece of machinery, j various wave lengths than any
probably because they have read other source of radio power now
that they are used in submarines, i;1 use.
and thely simply shoved the battery
I into a corner and left it mere ior
POSSIBILITY that California radio
amateurs, to meet shortly in. a
state convention at Los Angeles,
may work out a plan whereby ama
teur traffic may be conducted on a
24-hour schedule and stiU leave the
air free from interference for radio
phone broadcasting, on a basis that
will solve the wireless problem of a
whole nation, has developed with a
general call for suggestions sent
broadcast by Major J. F. Billon, in
spector for the sixth United StaWs
radio district, with headquarters In
the custom house, San Francisco.
Major Dillon's call for suggestions
comes at the interference oriels in
rAdio hiRtorv Kflct ind wAjtt- thftr
has developed a clash between the "ignals.
short wave traffic and the entertain
ment schedules of the broadcasting
The recent warninr Issued by the
Better Business bureau of New York
city against the stock selling activl
ties of an alleged radio corporation
brings to the fore a situation that
should be made clear to all radio
fins. The remarkable boom exper
ienced by radio has proved to be
fertile ground for the activities of
get-rich-quick" fakers of all varie
ties, particularly the fraudulent
stock promoter and the army of so
lictors urging the publio to get In
on the ground floor.
At the outset, therefore. It will be
a wise plan for the would-be inves
tor in radio stock to remember one
point very clearly, namely, that all
(be reliable radio apparatus Is fully
protected by patent rights and can
only be manufactured by corpora
tions that have been engaged in the
business of constructing radio ap
paratus for some years. There are.
however, one or two exceptions to
this rule In the cases of new com
panies, but they are so busy turn
ing out their apparatus that they
have no time to Indulge In any wild
cat promotion scheme or other stock
selling propositions.
There are no opportunities for
anyone to make a quick fortune out
of radio stock, except, possibly, the
promoters of some wlld-cat scheme,
who will get rich by playing on the
creauiity or ignorant investors.
The amplifying and loud-speaking
apparatus, which has been Installed
by the Western Electric company as
part of the permanent equipment of
the hotel. Is similar on a smaller
scale to that used at Madison Square
Garden on Armistice day when 38.000
people In and about the building
were able to take part In the service.
iTojectors have been placed at va
rious points In th ballroom and con
nected throua'h vacuum-tuh amni!
fiers to the radio set- The antenna
on the roof of the hotel picks up
muBio sent oui Dy the broad
casting stations and passes the
waves through an ordinary type of
reviving set in wnion they are am-
puiiea. ine power amplifiers then
Increase the strenath of th
Editor Radio Waves and Ripples: (1)
Can I use a 4000-meter coll on a single
tube set to receive the long wave spark
and arc stations? (2) In constructing an
aerial does It make any difference it it Is
drawn tight or not? (3) My storage
battery corrodes very badly at the ter
minals: can 1 do anything to prevent
this 7 (4) Should the negative side of
the "B" battery go to the positive or
the negative side of the "A" battery?
A FAN, Milton. Or.
1. Yes, but would advise the use
of honeycomb coils instead, as these
are the most efficient and economi
cal for long wave reception.
2. The antenna should always be
kept taut and well guyed to prevent
swinging. Most of the "fading" no
ticed by listeners when receiving is
due to aerials that swing. However,
there should be some slack, as the
aerial wires contract in cold weather
and may break.
S. The terminals should be well
cleaned and then greased with vase
line. 4. It Is usuallv connected to the
negative side of the "A" battery, but
on some tubes better results may be
had by connecting it to the positive
side. If your set does not work well,
reverse the "A" battery leads.
Editor Radio Waves and Ripples: (1)
Will a loose coupler increase my receiv
ing range using a crystal detector? (2)
What la meant by capacity effect?
(3) How can I make a goo.d varlo
coupler? R. T., Portland. Or.
1. A crystal set has certain limi
tations in that it cannot receive any
signals from stations further than
about 25 miles away unless the sta
tions happen to be unusually
powerful.
2. On a tuning coil if the wires
are covered by shellac or any in
sulating compound, the carrying
power of each turn is increased, as
the insulation tends to cause less
disturbance in each wire's free elec
tric field. This is the capacity ef
fect and it has a decided influence
on the Inductance of the coll.
S. Make your stator or stationary
coll of 60 turns tapped at the 12th
turn and every sixth turn thereafter,
wound on a paper or fiber tube 4
I.-iches in diameter. The rotating
coil Is wound on a SH-inch tube and
has 80 turns. Wind with No. 20 on
outer coll and No. 22 on inner coil.
definite recelvfhg range to any type
of receiver as the reception often
depends on outside conditions such
as topography of the country you
are living in, quality of the ground,
static interference and others.
2. There are several good makes
on the market, depending on how
much you want to invest. The con
nection of the loud speaker will de
pend on what type you get." In
structions for the connection will
be supplied with the apparatus by
the dealer.
Editor Radio Waves and Ripples:
1. What Is the difference between an
audlon and a vacuum tube?
2. Which will give me the better serv
ice, a two-slide tuning coil with SO
turns of No. 20 double cotton covered
wire, or a tapped coil of 10 turn to the
tan ?
3. Will a two-wire aerial 50 feet long
be as efficient for receiving radiophone
as one wire aerial 100 feet long?
T. R., Chchalls, Wash.
1. There is no difference what
ever. The word "audlon" is used as
a trade name for a detector vaccuum
tube.
2. The two slide coil will give the
better results of the two types of
coils as a finer adjustment of in
ductance can be obtained.
3. No. The 100-foot aerial will be
by far the best as it is naturally
closer to the 360-meter waves you
desire to get. The two-wire 50-foot
aerial will only be about one-half
the wave-length of the one-wire
aerial 100 feet long.
Kditor Radio Waves and Ripples:
1. I have a receiving set consisting of
a loose coupler, a vacuum tube detector
and one stage of amplification. My
aerial is about 150 feet long and consists
of one wire 15 feet high on one end and
35 feet on the other. With the proper
connections what stations should I hear
-with this outfit using a good 2000 ohm
head Bet?
2. What kind of a loud speAker would
you suggest in connection with this set
and how would you hook It up?
L. J. B., Eugene, Or.
1. You should be able to hear con
certs from stations as far as 600 to
1000 miles away when conditions are
favorable. However, there la no
Editor Radio Waves and Ripples:
1. Would you please mail me a couple
of diagrams using a crystal detector
and a vacuum tube? Will this new ar
rangement Increase the audibility of the
alffnals very greatly?
2. My antenna is about 25 feet high
at both end and 60 feet long. If 1 in
crease the helghth of one end will it
help any in receiving?
3. Would it be possible to connect
loud speaker with this set? I live in the
city and get the radiophone broadcasts
quite ciear and loud.
T. V., Portland, Or.
1. The hook-ups have been mailed
to you. The vaccuum tube detector
will give you a much greater range
of reception than the crystal type.
2. If you raise the height of the
antenna at the end where the lead
in comes down, you will increase
the receiving results of your set.
3. A loud speaker can only give
good results when connected to a
set which has at least one or two
stages of amplification.
It is . better to have a separate
rheostat for every tube In a receiv
ing set. because you may desire to
use different makes of tubes and
with only one rheostat fo'r two tubes
or more, the tubes may not match
up; some will burn too dimly and
some too brightly. Even if the same
kind of tubes are used throughout,
the filament adjustment of all the
tubas is not always uniform.
three months or more. If this has
been done it Is a wise beginner who
takes the battery to a well-equipped
battery station for a thorough ex
amination. The B battery, if left long in a
damp place, will be found to be use
less for radio purposes. Actual use
takes less from a B battery than
half the time spent m damp In
activity. The day may yet come when the
whole country will be able to sway
to the music of a single orchestra.
The Hotel Commodore in New York
city has just completed the installa
tion of a radio receiving set and a
1-iud speaking telephone outfit that
is attracting considerable attention,
particularly among the dancing
masters of the east and others who
see In it the possibilities of buying
their music from one central source
just as they obtain their light and
heat power.
Long-Distance Radiophone
Solved by New Tubes.
Vnmnm Created May Insnre Un
precedented SerTlce,
Special Music Programmes
to Be Broadcast.
Arrangement Made With Five
- IjOcal Stations,
GIANT vacuum tubes with a ca
pacity of 100 kilowatts are the
newest developments of the West
ern Electric laboratories. Critical
tests of the tubes made at one of
the largest trans-Atlantic stations
Indicated that tubes of even greater
power could be made if the demand
for them was found In the future.
The largest tubes used in the
operation of radio broadcasting
stations are of 250-watt capacity.
In comparison with : the new tubes,
this type is a mere pigmy in size
and power. It is asserted by radio
exrerts that the new tubes will rev
olutionize long-distance wireless
telegraphy, and within a short time
make possible trans-Atlantio radio
telephony.
Engineers who developed the new
tubes believe that two of the tubes
oonnected in parallel undoubtedly
will carry the voice across the
ocean, while four of them will as
sure a reliable and uninterrupted
service between New York and
London. The expense of maintain
ing such a service would be a frac
tion as compared with the ponder
ous machinery now necessary.
The essential feature of the new
tube is that the "plate" is a copper
cylinder forming the outer wall of
the tube. In the customary tubes
used in radio sets, the "plate" Is an
actual plate or small cylinder of
t-m metal inclosed in a glass tube.
If even a small fraction of an am
pere Is passed through the plate cir
cuit of one of the small tubes, the
plate will become very hot. In the
larger "power" tubes this heat be
comes so great that some means
other than radiation must be pro
vided to carry it off. ec the tubs crammes which they will provide.
O PECIAL programmes of music will
KJ be broadcast by all the Portland
stations during Portland's Music
week to be held November 5 to 12.
Lieutenant R. L. Crane of the police
department is chairman of the radio
division of the music week commit
tee and Is arranging with the five
local stations to have music broad
cast continuously from noon to 10
o'clock every day of the week, ex
cept during the hours to be used by
the three special features, "Alice in
Wonderland," the musical ball and
the ceremonies in conneotlon with
the unveiling of the Roosevelt mon
ument. Mr. Crane has asked the co-operation
of all business houses, electric
stores, community centers, and other
places where the public can gather
to listen to the radio concerts and
where a receiving set may be estab
lished with a loud speaker horn.
In order that he may have the op
portunity to arrange the programme
as soon as possible, Mr. Crane has
asked all who are interested to com
municate with him through the
music week committee, care of
Community Service.
The first commercial broadcasting
statfon is now in operation in New
York city, according to the Scien
tific American of October issue. A
musical programme will be given
between 11 A. M. and 12 M. and 4:30
and 5:30 P. M. week days over the
new radiophone broadcasting sta
tion WBAY, which was recently
erected on the Walker street build
ing of the American Telephone &
Telegraph company. A programme
will also be given on Thursday eve
nings from 7:80 P. M. to midnight,
to be later announced. Such a sta
tion, which is intended for com
mercial broadcasting, has been as
signed, for the present, by the
United States department of com
merce, a wave length of 360 meters.
This does not permit simultaneous
operating with the other broadcast
ing stations operating on the same
wave length In this area. As a con
sequence the available hours have
been assigned to the different sta
tions operating In the vicinity of
New York by an agreement between
the stations themselves and with the
approval of the department of com
merce. The above schedule of two
hours In the daytime and four and
one-half on Thursday evenings is
the temporary schedule which has
been assigned to WBAY. A. W.
Drake, general commercial manager.
in charge of the station, states that
there have been close to 100 appli
cants for the use of this station and
that lie has taken steps to arrange
with these applicants for the pro
stations. Amateurs transmitting on
200 meters have interfered with the
growing number of listeners who
have no Interest in amateur buslnese
but who like to sit in "on the air"
for entertainment from radiophone
units operating on 360 meters. Con
versely, the broadcasting has Inter
fered with amateur traffic.
The general public, unfamiliar
with amateur activities, Is prone to
exclaim: "Those kids ought to Do
made to keep out!" Radio experts.
radio engineers, officials of the
United States government and the
radio leagues east and west, who
appreciate the value of amateur ac
tivities, eombat this strenuously.
For behind the wliole fabric of ama
teur radio activity is one funda
mental fact that through the work
of these "kids," as the public calls
them. has radio received its major
impetus.
Does the generail public know that
if every telegraph Line and com
mercial radio station in the United
States were to be put out of buai
nes tomorrow, through a strike, a
war or a national calamity, that the
amateurs of America could handle a
guaranteed relay service, coast to
coast, with an actual transmission
time of less than 15 minutes from
San Francisco to New York? Do
they know that when the United
States army flung the tentacles of
its "listening service" along the Ger
man frontier, the American ama
teur lay on his stomach in the mud
and tapped the secret codes of Wll
heimstrasse and did a giant part In
circumventing the foe?
The American amateur must be
kept at work, for to him science
owes much. In San Francisco the
radio amateur has been more than
fair. When It was brought to his
attention that the general public
wanted its entertainments between
7:30 and 9 P. M., the amateur agreed
to stay off the air during that pe
rlod. This was done and has been
done every night in the San. Fran-
cisco bay district since the agree
ment wa3 made.
Efforts have been made to extend
this "Pacific plan," as It Is known.
all over the United States. But the
rapid growth of powerful broadcast.
lug units has made the working out
ox thl4 scheme more difficult than
was anticipated. The crowding of
schedule hours has made necessary
an extension of time beyond the
allotted 9 o'clock. Listeners want
longer concerts. This ties up ama
teur work, because 200 meters and
360 meters are so close together
in wave length allotments that one
interferes with the other.
To get all the fund and enjoyment
out of radio, one should by all means
obtain a buzzer practice set and
learn the code. If a person roes to a
foreign country to live, he will not
be satisfied to talk to people who
speak only his own language, but
will also want to be able to under
stand what other people are saying
In the language of the foreign coun
try. If he will devote a small time
each day to learning the new inn.
guage, he will soon be able to speak
well enough to make himself under
stood and to understand what others
are saying, so that he will make
new friends and get a better under
standing of what Is going on around
film.
Learning the radio code will do
the same thing for yon and let you whr neit shfw-e tred lightly ev-
T ' 1 '4!U-
JLUV ':
' i fl n. Current
SIMPLE circuit ros CMo i,ir,imin wmrs ron tis rium:iT
OK VACllM TlBav.
SEVERAL methods have beea de
veloped in the last few months
which eliminate the use of the
storage battery and permit the
working of a receiving set direct
from the electrlo wires.
It- has been found, however, that
the circuits are critically balanced
and few amateurs have bad suc
cess In getting results with them.
The storage battery is still the most
practical source of current for the
lighting of the tube filaments.
It 1 sot advisable for the average
fan to tamper with the house light
ing current unless he knows seme
thing of electricity In general. The
storage battery Is the moat safe and
sane source of current for them.
If you have had some experience
with the high amperage currents of
the house-lighting system and de
sire a good circuit for lighting the
tube filaments with the 11 A C,
try the circuit which accompanies
this article. It bag been and still
Is used by a few amateurs, and
gives fairly good results A six
volt step-down bell-ringing trans
former is used with a potentiometer
of not leas than 1009 ohms etrsd-Sle.
across the filament la'sa.
In operating, the s.t'ier ef the pe
tentiometer must ha in the eaac
center of the resistance.
By "exert eenier" does not maat
"approximately the exact ceatar.
must be In the perfect middle, e'her
wise the necessary current baianc
does not eitst. A vernier rbeoata
la excellent for this purpose, as th.
second lever of the Vernier run
over a single turn of the reaietan
wire, permitting a very fine adjust
ment.
In place of the lelepiosea, a l'e
phone transformer la eubetltutad
the Man voltage winding being eon -nected
to the plate eirealt of th
lamp, and the low voltage of th
transformer to the bead phone,
through a email .0001 m!-ro-fara
condenser. This tiny condenser wiv
the low voltage winding constitute
what may be known, as a "bur
trap." U Is la this (rap (hat th
sound of the "line singing" Is r
duced to a minimum .
The circuit aho n la prartle!!'
as efficient a that suggested by in.
bureau of standard, and. If rare
fully balanced. Jus! as gond aa a! IT.
tnator of the line humming.
"in" on radio as you never would
be without this knowledge. Fifteen
minutes a day wltn a friend who Is
sending to you will accomplish re
sults that you would hardly believe
possible. Buy a buzzer practice set;
It consists of a buzzer, a telegraph
key, and a battery.
e e
Do not expect results If you use
the cheap 75-ohm receivers. A single
phone of 1000 ohms from a reputable
manufacturer will give you much
better reception. Two receivers will
be better because the signals are
heard In both ears and outside
noises can be kept out. To test
phones put a wet piece of newspaper
between a penny and a dime. Clicks
should be heard when the terminals
of the receivers ars touched to this
miniature battery. At times the
phone cords become defective and
cause ths received signals to break-
Get a new pair as the defective
cords ars not worth repairing.
see
The Hague concerts, sponsored by
the Northcllffe newspapers, have
not proved the universal success
anticipated owing to the "jamming"
of the air by the vast amount of
shipping in and near ths English
channel. On several occasions the
music, not audible In London, wms
heard on the extreme west of Ire
land and as far north as Aberdeen,
Scotland, while ships at sea prob
ably 1000 miles on the Atlantic) voy
age reported good service.
Enthusiasm In Holland, however.
says ths newspapers local corres
pondent. Is intense. Alike la me
villages, whers clogs rattle over
the cobblestones, and In the towns.
err Rollandor la an the ttp-to e
excitement over the eonrta.
At Ths Hague. Amsiordam. sn
Rotterdam the enthusiasm Is gres
but understandable. It Is greet
till In the peasant parta. where Ih
quaint national drvsa la worn, an
it Is a Strang thing thai, aa.ious
tbe gramophone was neve takei
kindly to In ths Dutch farming di
trlrta. there are aiready enoog!
wireless sets for everyone to lis
ten In.
Wireless, ernps and flowers sr
main topics of mn versa r ion, (hei
back again to wlr!eea. It la an 1
the laie of Wslchsren. tit r"tci
Thanet, where the liiouse-wearlni
farmer and bta clogged and tn
neted wife are overhauling th.
atrial the.t swings over a profus or
n' flowers
Radio Notes.
THE bureau of mines of ths de
partment of ths Interior la en
gaged In studying the problem of
applying radio apparatus in con
junction with mining operations, es
pecially for use in cases of emer
gency. One of the proposed applica
tions Is the establishment of a suit
able broadcasting station at each
mine, so that a radio distress call
could be sent for assistance in the
event of mine accidents.
It Is expected that such a scheme
would materially assist in mine res
cue work, especially as rescue sta
tions could be centrally located to
a number of mines and be equipped
ready to rush to the scene of any
mine disaster In Its particular district.
Another problem that is engaging
the attention of the experts of the
bureau is the construction of small
portable receivers which miners
could take with them Into ths work- I
The New General Electric
Tunner Detector Amplifier
A Complete Radio Receiving Station
This compact and highly efficient receiver is of the sin
gle circuit type with a continuously variable air conden
sor for tuning. Provided with a regenerative coil for
amplification and oscillation. Suitable for reception of
voice and all signals.
Com in Let Ub Demonstrate
Broadway
1696 .
75 6tk St.
gflllS
Operating
K.Q. Y.
ELECTRIC CO
THEATER MEN '
NOTICE ;
Let as flgnre en a Mgl-rlase
radio receiver and "Loud
fcpeaker" for your theater. i
it unixtiis. the cnowni. '
I
HALLCCK & WATSCN RACI3 !
SERVICE j
ita park Trtrr. j
Prilstv OrtfMk, j
RfMMttlHI f-irta4 CO 1
LBspvrlMWial tatua fXl '
TROUBLE
WITH TOUR RADIO BKTI
WTIT NOT BRING IT TO AN
EXPKRT OK 12 YEARS"
EXPERIENCE?
R. G. BRANT
DESIGNING. REPAIRING,
COsNSTHLCTI.Nt; .
862 lirU Oak nd Surk
Scond f loor
wi thm rrw owKeOi
ftTATlo ,rm..t In ..ixti. you
houlrt lutv fh hnt rni r
clvlnw ! Ibat yu n 1
rf U ht kuii.1i. Thifl
KW BTA1IO I- inf t
th public th b-t n-n rii it mt
thmy hivt tvr b !! ovr a r
colvtriff tJ an-l to mak tl rots
tn aa It ahouid hv not ct a
PAt that ha a ful fuarnta.
Our aai wiit you ihM r -
au.la yea hava to looking (or.
RADIO SERVICE
BUREAU
na Oi
trm Hies. Mala 41EM.
1'ertlaad. Or sea.
OUR SALES
advertised for last 2 weeks will be continued for
one mote week.
The
!JC Store
J. B. WEED, Mgr.
(The Oldest Exclusive Radio Store in Portland)
Mail Order Service Write for Catalog
310 OAK STREET (Installers KGW) Portland, Oregon
One-Stage Radio
Frequency
adds greater distaar t roar
set. Complete rtock of
Transformer
Potentiometers
Vernier Rheostat . Etc
M. J. WALSH
ELECTRIC CO.
106 Fourth Street
Burr. wiiMiskToa isuitam
E. L. KNIGHT & CO.
44 WsaOlsslea at- Tear 12lh
prnsewtr l4n
CALL r ! ! ntaTIO
iiSI.H.t I mil
WLMdim Sets mmm farts
-id a ii buii iiif tuens rir