coil at least two ninchoe away tron:
all condensers or other metal in the
set. 7 ’
Both these types of "air core"
coils have very low losses. In ad-
dition the distributing capacity is re-
duced by getting away from a solid
winding form. Spacing the turns in
the coils shown in Figs. 2 and 3 also
lowers the distributed capacity.
A low-loss coil is of no great value
if it is used with poor-grade con-
densers. and if poor sockets and
grid leaks and grid condensers are
used. We will discuss low-loss con-
dc era and sockets in future ar-
ticles. >
Copyright. 1924. by The Arabian
Radio Relay League, Inc.
l
'o I-
.. .. . .. q atria-l ~1‘3—."«‘A-..n~ 9......
’ .
l'l'he tendency among many radio
‘fans today is to add more amplifi-
cation. either audio or radio. if they
V ' want to increase the range and sen-
sitivity of their-sets. Rarely do we
find a fan doing the logical and son-
slble. as well as the cheapest thing
—-improving his present set before
adding more tubes. It is surprising
how the volume and range of a. set.
may be increased by installing low-
lo. coils and condensers in place of
- ade 3 aratus.
cglgpaglrater agile we will take up
the subject of low-loss variable con-
densers: our subject today “'1” be
the design of low-loss coxls for the
in ap aratus. — .
tu‘I‘n gdesigning' a low-loss coll .we
should have two things in mind.
First, we want to get a. low—resist-
ance coil. because resistance in the
cirEiiit causes a low in Signal
strength. Second. we want to.get a
coil with comparatively little distrib-
uted capacity, because distributed
capacity narrows down the tuning
range of the coil. and tends to
broaden the tuning.
{there are many factors which
tend to increase the resistance in a
coil. The material on which the con
ink-wound. the size of the wire. and
th‘ presence of quantities of metal
will all affect the resistance. The
shoot the wire is easily fixed. in all
low-loss coils a good size of wtrc to
use is No. 1:: or 14 double cotton
cbbered wire. Larger sibes will not
give any appreciable loss resistance
and will have the disadvantage of
being difficult to handle. Avoid any
kind of standard wire. As mention-
ed in a previous article. stranded
wire is all right if all the strands
afihnbroken. but this is almost
$16.2
F163
never the case. Use solid copper
wire. -
Now as to the material on ”which
the coil is wound. Any kind of
moulded composition is bad to use
as a. winding tube. Even bakelitc
and similar materials are far from
perfect. A thin-walled cardboard
tube which has been snakod in par-
affin is better. The best thing of all
to use as a ”core" is air—in other
words. some form of self—ail porting
coil is desirable. In Fig. 1 have
illustrated a method of construction
of such a coil. Fourteen heavy nails
are driven through a stout board in
a four-inch circle. and the winding
made as indicated. “’irld on about
00 turns for a coil to be used as a
secondary tuning c~oil for broadcast
unveiengths. \l'hen,thc coil is fin-
ished, bind it. together with string or
thread—do not use shellac or “dope"
to secure the Winding.
There is one disadvantage to the
coil shown in Fig. 1. and that is a
difficulty of construction. It is hard
to use the heavy wire specified with-
out having the nail points scrape
away some of the insulation. there-
by creating the pOssibiIity of "short-
ed" turns. Accordingly we have
shown another highly desirable form
of coil in Figs. 2 and 3. The draw-
ings are self-explanatory. The wood-
en strips are three-clghths of an inch
high, and are glued to the cardboard
tube. In winding on the wire. space
the turns with string. After the coil
is wound. remove the string and
fasten the wire in place with a very
small amount of air plane dope
(celluloid dissolved in acetone.)
This type of coil is much easier to
construct than that shown in Fig. 1.
As previously mentioned. keep the
Tube Reflex
By CABIIION E. BUTLER
(Radio Engineer.)
If you do not hear every broad-
casting station within a radius of
two thousand miles the first few
nights you operate your receiver, do
not be dishearted and condemn the
circuit. .
it takes a few evenings to become
acquainted with the operation and
control of any new circuit. You may
find that you will be able to tune in
long distance station very readily
after a. few weeks practice on a. set
that you Wore ready to condemn af-
ter the first night's trial.
There are but a. few controls on
the four tube reflex receiver and this
will mean that each adjustment
must bc carefully made in order to
tune in exactly on the wave of dis-
tant stations.
Tuning is relatively simple and
you should have little difficulty in
tuning in distant stations. The con-
denser dial is the wavelength con-
lrol by which the receiver is adjust.-
ed to reasonance with the incoming
wave you wish to listen to.
Remember that your loop is direc~
tional in effect. That is you must
point the loop in the direction of the
station of you wish to ilste‘ to. if
your loop is facing the station very
little energy will be received.
Slowly rotate the loop in all di~
rectlons and turn the condenser dial
until a. signal is heard. Now adjust
the crystal until a. sensitive spot is
found. Bring the signal in as loud
as possible by careful tuning of the
condenser dial. Now. try incrllslng
or decreasing the filament rheostst
until the correct point is found
where the volume is greatest. If
find that your rheostat must be turn
loudest point it. indicates that. younA
battery is low or on. of your tubes
* ll
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AMERICAM AMATEURS REACH -
MrwzlaALAMll BY RADIO
HARTFORD. Conn.. May 7—The
belief that amateur radio in the
.United States is about to swing wide
the doors of other nations, opening
the way to private communication
between individuals in widely dis-
tributed sections of the globe. is
given still greater credence by the
report that F. D. Bell. prominent
New Zealand radio experimenter.
has heard 500 American“ amateur
stations. .
The areceptlon of signals from
amateurs in this country is becom‘
ing alto.:thcr “too easy." says Mr.
Bell. in a letter to the American
Radio Relay League. “It has come
to this that anyone with a. single
is defective.
The potientlometer knob is the
last adjustment to make and the one
with which the most cars should be
taken: You will find that a. slight
movement of the potientiometer will
make quite a difference in the sig-
nal strength of the station you are
listening to. Turn the knob just up
to the point where the signal is
loudest but not beyond a point at
which the set howls. This is the
proper point to receive all stations.
Copyright 1924 b ythe S. N. L.
Technical Syndicate.
\VEDNESDAY
“\VEAF—New York City-402
11 a.m.—Adele Lewing. pianist.
11:10 a:m‘?~"l‘irst Adventures in
Baby-hood." .
12 Noon—Chapel services from
Columbia University and musical
program.
12:20 p.m.—Mar.ket and weather
reports.
4 to 5 p.m.-—-—Billy Wynne's
chestra. .
5:00 p.rn.——Irene Jacques. sopra-
no.
7:00 p.m.—Rellglous services.
7:30 p.m.——Sport Talk by Thorn-
ton Fisher. -
7:40 p.m.—Helen Jenlts Dietrich,
pianist.
7:59, ‘p.m.—"Eetate Building." H.
K. Hutchene.
8:00 p.m.—-"lntroductions to Pay-
chology" by Dr. Gardner Murphy,
Columbia University. ,
3:20 p.m.-—Concert by the Delta
Upsilon :Glee Club.
9 to 10:00 p.m.-—Orchestra selec-
tions. ' §
10 to 10:45 p.m.-—Hawaiian 0r-
chcstra numbers.
Or—
WJZ—Ncw York City—435
1:00 p.rn.—-0rchestra selections.
2:00 p.m.-—New York Bohrd' of
Education program.
3:00 p.m.-——Frieda Williams. so-
' songs a ,
.4 Peeps
prano.
3:15 p.rn.—Jcan Praia. pianist.
8:30 p.m.~—School Art. League pro
gram.
3:45 p.m.—Jean Prals. pianist.
4 p.m.——Basebail scores. every 15
minutes.
4:05 p.m.——Eleanor Gunn‘s fash-
ion talk. _
4:30 p.m.—-Tea music.
5:80 p.m.—Lccture by Dr. Her-
man 11. Horne.
7:00 p.m.—Story for Boys and
Girls. *
7:20 p.m.—"Flnanclal
merits of the Day."
7:30 p.m.—Seizer'e Orchestra.
7:45 p.m.—"The Progress of the
World."
8:00 pm. fielser's Orchestra.
8220 p.m.-—Clty Official Series
full: by Frank Mann.
8:50 gum—Miriam Hoffman, vio-
iinist.
9:05 p.m.—Marie Rose Kelley. eo-
prano. ~.._
9:20 ppm—Miriam Hellman. .vlo-
Develop-
‘Iinist.
9:35 p.m.—-Narinska. pianist.
10:00 p.m.—l{unter College Chor-
al Society.
10:30 pan—Coleman's Orchestra.
\VHN—New York City—300
2:15 to 5:30 p.m.——Plano eclec-
llons and songs.
7:30 p.m.——Marjorle Mandeil. so-
prano. .
7:35 p.m.—Mal Hallett‘s Orches-
lra.
S p.m.—Orchestra numbers and
entertainers.
3:30 p.m.—-Rabbi N. H. Ebln. "Ci-
vilization’e Debt: to Jewish Thought.’
8:50 p.m.——H. Murray O'Neil, bar-
itone.
8:55 pun—Agnes MacPeske. so-
prano.
t 0:00 p.m.———Dan Gregory’s Orches-
ra. .
9:30 p.m.-—-M. Wltrnsrk Black an
White program.
WOR—Newark—dOB
2:30 pin—Recital by Sylvia. .‘l'ao-
oby, contralto. .
2:45 p.m.——Soprano solos by Hel-
cn White.
3:00 rum—Concert.
3:30 nun—Soprano solos,
White. .
6:15 p.m.——"Muslc While You
Dine,” Ernie Krickett’s Orchestra.
8:55 'p.m.—-—-Resumee of the day's
Helen
sports.
8:00 pan—Sigmund Spaeth. mu-
sic critic. and Godfrey Ludlow in
"Common bones of Music Series.”
9:00 _p.m.-——"Tho Olympic Games.‘
9:15 to 11 p.m.—Popular songs
of long agoby their writers.
‘ WAAM—Ncwark—ms
. 12:30 p.rn.-—Luncheon concert. .
1:30 p.m.—H.ini:»‘for the house-
wife. .'
7:00 pan—Al Nevins. tenor.
7:10 p.m.—Richard Douglass In
stories. ,
-7:;:o p. .--._-"Six Singing Shainlt‘
7:45 ° lama-“A Non-maxim
at Life," Theodore a. North-
tube and a two coll circuit can hear
a dozen on any single night. and the
receiver that won't bring them in is
a "dud." I'm referring. of course.
to the louder stations. For the faint
ones I am still a believer in two or
even three stages of radio frequen-
cy. ..
"'During the last twelve months
more than 600 Yanks have been
logged at this station. The other
day I went through my entire re-
cord and marked down the num-
ber of different nights (if any) on
which each station had been heard.
It a station was heard more than
once in a. nitric night. I still count-
ed it as one only.
"The operators at SAHD (which
is listed in the call book under the
name of E. T. Plumer, Santa Mon-
ica, Cal.) share a five watt tube be-
tween and both pushed their calls
across the Pacific in quick succes-
sion. The writer has listened once
or twice in the region of 100 meters
and heard a few Yanls o_n detector
only. This short wave Nor]: is cer-
tainly wonderful." ,
As soon as the New Zealand rm-
ateurs are able to increase their
range. two way communication pro-
bably will be common.
. g A . ~mv‘:_.‘~—
8:15 p.m.—Marguliea Trio.
8:30 p.m.—-"Hobbles and How 1
to Ride Them." Lawrence C. Gran-
Ville.
8:45 p.m.-—-Ross Ann. soprano.
9:15 pain—Oscar Taylor and Al
Wilson. singing.
10:00 p.m.—Songs by artists.
10:15 p.m.——Jimmy Doyle
George Roberts.
10:30 p.m.—Leo Friedman's Cel-
ebritles.
and
' WBs—Ncwnk—soo -
11 ant. to 12 noon—Recital.
1 p.m.-—Grace Cox-lover, singing.
1:30 to 2:15 para—Program of
popular dance music. .
“’DAM—Phiiaddphb—SOO.
11:45 emu—Dally almanac.
12:03 p.m.—Organ recital
Arcadia Concert Orchestra.
2 to 3 pan—Arcadia Concert Or-
chestra.
4:30 rum—Recital from the stu-
dio.
6:16
Trio. ,
5:45 p.m.——l~‘ina1 baseball results.
7:30 p.m.——-Drcam Daddy Mth
the Boys and Girls.
8:00 p.m.—Rccital.
gan: Edna Finestone; special
lures.
10:05 pun—Howard Lenin's Don
Dance Orchestra.
and
p.m.-—-The Cosmopolitan
Edith Mor-
fea-
WOO—W
11:00. a.m.—Grand organ recital.
11:30 a.m.—Weather forecast.
12:00 Noon—eLuncheon music.
12:55 p.ni.-—Time signal.
4:45 p.m.-—Grand organ and
trumpets.
7:30 pan—Police
music.
8:15 p.m.—-—Grand organ recital.
Mary B. Vogt.
8:45 pun—"Golf." Alexander 11.
Finley.
9:00 p.rn.—WOO Orchestra.
10:00 p.m.——Waiter Miner's or-
chestra.
10:55 p.rn.-Time signal.
11:02 p.m.—Weathcr forecast.
reports and
“'lP—Phlladclphia—MIO.
1 pin—Luncheon music.
1230 pan—Weather forecast.
8 p.rn.—-—Art.iat recital by Ethel
Smeltxer Littiehales, soprano: Laura
'1‘. Bast. contraito: Charles Krooks.
violinist.
4 p.m.-—-Taik..
6:05 p.m.——-Muslc by Weyrnann
Five Orchestra.
7:00 p.m.—Uncle Wlp’s "Bedtime
Stories."
WFI—Philadciphik—SOB
10:15 a.m.——Market reportl.
1 rum—Meyer Davis's orchestra.
1:50 pan—Agricultural reports.
3 p.m.—Musica1 program by trio;
talk by J. Frank Copeland. ,
8 p.m.—-"Sunny Jim." the kiddies’
pal.
6:30 run—Meyer Davis's orches~
tra; baseball scores.
“’SAD—Providence—aol _
2:30 to 4 p.m.——Concert.
6 p.rn.——Story lady.
1:15 p.m.——Joint recital.
WGB—Buffalo—s‘ 13
11:45 a.m.—-Weather forecast.
12:30 rum—Organ recital.
2:30 to 4 pan—Concert by radio
dealers.
6:30 pan—Vincent Lopez's dance
orchestra. .
7:30 p.m.——}Dlxgest of the .. day's
news; baseball scores.
9 p.rn.——Woodside M. E. Church
Choir. . ' ‘
10:30. p.m.—Braner brothers' or-
chestra: Ivan‘ Pierson. baritone.
11. p.m.—:Vincent Lopez‘s dance
orchestra. -
11:45 pan—Weather forecast.
way—memoy—ses
6:30 p.m.——Adventuro ton.
8:15 pans—Stem max-kc .
' mill—W
"s to_11 pump-Vocal and-Instru-
mental concert: educational addres-
WGI—a‘, «Bord. M
linden—Musical selection.
12:40 p.m.—’—W'eather.forocast.
«roped—Market reports.
.‘ 67:45*’p_.m.-A-06derpractloe*lse§bn.
'» 7 pm—Arnr'ad 'Big Brother-Club
, Z . 1'3
lCha‘jlr‘e ha
days during church serum._
Approved: (Signed)
ATTENTION. AMATEURS: .
During the daylight saving period, or from May 1 to ac.
tuber .1, 1924, all general, resin-loud and special amateur
transmitting stations are required to observe a silent period
from 7:00 P. H. to 10:30 P. M. local time, or from
8:00 P. M. to 11 :30 P. 11., daylight saving time, and on Sun-
(Bignod) D. B. CARSON,
3. B. DAVIS.
Acting Secretary of Commerce.
' lthe
‘calll‘d hm
Yer-“1,:
a
E F “T103: rr- .
YEvcx-s TH'.‘ if.
‘30:?V hr: 1‘. {Jr
lSn): lr‘p '3 '
r ' ,Y‘i .
l“h~f-" ILL D.»
'0001 lies
lbenlrh
Elinr‘lifj 3
fall”: 2153‘: .
(r
Commissioner.
Rev. B. M. Heald: Orpheus Quart-
et: popuhr song hits.
WNAG—Boetm—S'IO
10:30 a.rn.-—Women's Club talks.
12:30 p.rn.—-—Organ recital.
1:45 p.m.—Concert by Shepard Aa-
soclatee. -
t 4 pun—Shepard Colonial Orches-
re.
1 t4:15 p.m.—-Gerald Gavlnl. violin-
I . .
4:30 p.m.—-Incldental unuslc.
6 p.m.—Chlldren's half-hour.
5:30 p.m.—WNAC dinner dance.
8 p.m.—Gnqulnta Trio.
9 p.m.—Slnfonla Fraternity con-
cert.
WF7n-Sprlngncld, Mesa—33~ 7
12:59 p.rn.——Arllngton time eig-
nale. '
6 p.rn.——Baseball results: dinner
concert by WBZ String Orchestra.
7:20 para-Bedtime story for kid-
dice.
-7:40 p.m.—Danco music.
8:45 p.m.——Concert by Springfield
Conservatory Male Quartet.
10:00 p.m.—Results of baseball
games. _
11:50 pun—Summary of "day's
events at general conference of Me-
thodlst Episcopal Church.
11:00 p.m.—-Speclal music week
celebration with choir of 200.
KDn—HmbmHzc
12:15 p.m.—Concert by Daugher-
ty’s Orchestra. '
12:55 pan—Time signals.
3:30 pan—Baseball score. inning
by inning.
6:30 p.m.——Bueball scores: con-
cert continued. '
7:80 p.rn.—“Robln Hood."
8:00 rum—Baseball scores.
9:00 p.rn.——Concert. by Mendelsohn
Choir.
10500 pin—Concert from School
of Fine Arts. , ’
WCAE—Plttsbnrgh—403
12:30 ppm—News.
2:30 p.m.—Plang recital.
4:30 pan—Stock market reports.
5:30 p.m.—-——Dlnner concert.
7:30 p.rn.——'l"h.e Sunshine Girl.
7:45 nun—Feature.
5:30 p.m.—Musical program.
“RC—WWO
3 p.m.——mhion developments.
3:10 pan—Song recital.
3:25 p.m.——Report of the National
Conference Board.
3:30 rum—Song recital.
3:45 p.m.—Plano recital by Elea-
nor Glynn.
3:50 p.rn._--Current topics.
4:00p .m.-~Song recital.
5:15 p.m.-1nstructlon in interna-
tional code. ’
6:00 rum—Stories for
Peggy Albion.
5:15 pun—Talk.
children.
wcAr—w-sh a
7:45 to 9:45 p.m.-—A "Bob" Law-
rence concert.-
WCAm-demon—SOO
7 p.m.—-Recitai. Mrs. Charles
Kraerner.
7:45 pun—Allen 'l‘srshlsh. elocu-
tionlst.
s p.m.-—Concert.
B’DAP—KANSAS CITY—411
4:30 P. lit—Johnny Campbell's
orchestra selections.
7 P. M.—Plsno tuning. weather
forecast. address and music by Fritz
Hanioin‘s Ensemble.
9 P. M.-—Program by Edna For~
sythe.
12:45 A. M.—"nghthawk Frolic"
with coon-Sanders Orchestra.
KSD—-ST. LOUIS—540
7:80 P. M.—Progrem of Abergh'e
Concert Ensemble.
10 r. M.-—Concert by St. Putin's
Band. . -
12 P. M.—Rodemich's orchestra.
“'OS—JEFFERSON CITY—441
9 P. M.——“How to Control Apple
Blotch."
9:20 P. M.——Barn dance tunes.
KlWV-aCHICAGo—uo
11:35 A. ILL—Table talkunna. .1]
Peterson.
0 P. M.—-Spanish lessons by Pro-
fessor A. A. Breachi.
6:38 P. M.——News.
6:45 P. M.—Children'e Bedtime
Story.
7 P. M.——Dinner concert by Joaka
De Babary's orchestra and Paul
Whiteman'e Collegians.
8 P. M.—Muslcal program.
9 P. M.—"Good Roads."
9:05 P. Jinn—Talk.
9:15 P. M.—Book reviews.
10 P. M. to 2 A. M.—Midnlght re-
vue.
WMA. Q—CEIOAGO—d‘e
'2:85 P. DIP-Lyon & Keely pro-
at.
4:30 P. M.-—Iteine of interest 60
women.
_ 4:80. P. M.—'—Puplls of Cosmo .
tan School of Music.- ' poll
7 P. M.—-Storlee for the children.
31:211.:- 5:..““"...' ”at“...
. ._ . ca
clety. \ ‘ Bo-
. . fire-mum"
_ o . DAL—Bones 1: artists
and Dell Lampe's orchestra.y
1 A- Mc-Proeram to : .
B. lilachllan. rDr Donald
:3; 1;.- M.—Luncheon concert.
' . —Dlnner cones 13m '
ensem evand quintet. rt. ' °.
~11 - “Wk Chipmunk Dance
Orchestra...
i
Calhoun Davis. I ’ '
10:30 P. M.—Concert
Gaines's orchestra.
8 P. M.-—Rudy Seiger's orchestra.
KGO—-OAKLAND—812
4 P. M.—Short musical program.
7 P. M.—Concert orchestra. .
9:45 P. ILL—Stock Exchange and;
Weather reports. I
CKAG—MONTBEAL—dso l
1:45 P. M.—Mount Royal concert.
orchestra. -
4:30 P. M.—Mount Royal dorm 3
orchestra.
by Dick
Eveready “3': .-
223: Volts
45 Volts
Iiarlm 131mm...) 1'3;'~
storage ileum»: 1
IS bN
Uncle Wilbert Robinson of the
Brooklyn Dodgers will call himself
a lot: of mean names if Ray French '
delivers at short for the “'hite Sax. .
last spring. while Robbie‘s infiud
problem was causing him'sleeples<
nights. he decided that French
wouldn't be of much assistance, due .
to a bum arm. Robbie hated to‘
part. with the youngster. The Brook-
lyn club had paid French 3. 310,000
bonus for signing a contract last‘
season after Judge Landis had de-
clared him a free agent. But
French's wing was ailing so Rob. .— ,
son cast him Lose. T -
Johnny Ever: took Frank l 6 Riv-I St‘ Fun.
Chance’s tip and signed the castoff. '
— and -
CAHILL
EISEMANN
SEE» AND PARlS
Sill
100 AMP. MARIO RADIO STORAGE .‘AT.
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SOUTH NORWALK
As the days roll by—tlw aniuwr-nl you 01*
lain “am the radio grows cream
There is no wonder—for there's “311‘
thing different on the air—always lalk. song
dance ’llen ."_
glue myrtle ATj‘g'ATIZB-RES' and RAPI-
OLAs—Ah‘ e latest word in radio.
BM sets that nuke psiblc 5118th
E! tunlns—thu tune out local sums—amph-
fY smart and clear the songs e' dam” "n'
annoyed with bothersome ilitcr’l‘nl.“‘. .
Come in today and examine much—tum .m
and hear-the ranks—you‘ll agrllhru tho .. I:
It DAN’S TIRE SHOP are the b« b"? 1“ to“?
today.
——-—SETS AS
some
LOW A5 51.0——
DAN’S TIRE {HQ}?
SOUTH NOR“‘ALK AI'TO 1‘le (0’
98 NORTH MAIN $15131
_ SOUTH NOB‘YAL]
in
Norwalk Chronicler