Tun Stage Tuned Impedance Circuit
‘2 smote TUNED . lMPEDENCE CIRCUIT
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‘ distant
. hing
‘E\\’ith a two stage audio
are implified.
Signals are undistorted and free
from the hollowness of sound that
characterizes the operation of a re-
generative receiver near the oscilla-
tion point of the detector tube. The
squeals and howls that are so num-
crous with the regenerative type
of receiver will be greatly lessened.
Standard Parts Used
‘A great many of the three circuit
receivers are of the varicouplcr
two variometer type. To add radio
frequency to this type of tuner will
unduly complicate controls and use
more apparatus than is really neces-
sary. The circuit presented in this
article makes use of a variocouplcr
and two variometers in a two stage
;radio frequency and detector unit.
amplifier
the circuit becomes a five tube re—
0
02/: 1"}11‘ Will Your Radio
50! Receive?
”L ”A I'm: .
.x t \x;
. :i 1' used'
‘ Trig auto~
lzr pro-
ZthtUl‘C‘l'
Its tire
, *. etc.
: ‘ majority
,— :1: together
I 7‘". of mile-
arn industry
' ire-sent in
r! fits are
“.1 such a
if“) or 2.-
s are just as
C‘ 7' . iaze claims
‘ P take into
' ‘ factors
recep-
localities
-i i: would
1 -: the mileage
3‘: ~ * - ‘ regenerator
__ ' 's over dis-
~. ' id such rc-
en made. but
unwise tor
' -:ube regen-
sure such re-
e most ex-
ions as re-
- F fimfufieknfibmgfi'
if ‘— iARF’EER WlLL THE R.F.SET_RECENE-?
- a
ime of year. power of the transmit-
:ing station. ands thousand and one
other details that will vitally aflcct
the final result.
”For the same reasons it is not
certain that a. five-tube receiver us-
ing radio and audio amplification
will alwayp give better results than
a regenerative receiver and one-
stage audio amplifier. The five-tube
set. it operated in a. poor locality.
might have a range of but 400 or
500 miles. while the smaller set. in
a. good locality, might do consistent
reception at ‘twice'these distances.
"Dead 8 ts” are very common
over the exam; and will do much
toward cutting down the range. Re-
ception fro all directions may be
©19a AMLTKIJYND.
eeiver.
The coupling method used in oft~
en called "tuned impedance" in con-
trast. witlbresistance of transformer
coupling. In many cases the design
or radio frequency transformers is
such that they will not. Dl‘OVide ef-
ficient amplification over the wave
length range of 220 to 600 meters.
This is due to the fact that there
may be marked peaks and depres-
sions in the amplification range of
the transformer, with the result that
little. if any, increase of signal is
obtained in such depressions. Re-
ceiving with transformer radio fre-
quency coupling is usually unsatis-
factory due to this reason.
“’lth the tuned impedance meth-
od is is possible to tune each stage
in reasonance with incoming wave
so /that a, maximum of transfer of
made may vary widely from night
to night.
Individual construction plays an
important part. During the last few
months there has been a. consider-
able movement -' toward equipping
sets with low-loss coils. condensers.
sockets. etc.. and it is hoped this
tendency will spread. There is no-
arguing the fact that a. low-loss set
will reach out better than a similar
sctlof poor construction.
The proficiency of the operator
is not usually taken as so iousxy as
it. should be. A poor operator with
a. given set might be able to tune
in stations up to 500 miles where
an expert. operator with the same
set could do good work at 800 or
1,000 miles or further.
‘tl’EAF—Xew York City-402
i51:11:00 a.m.—Rita Rotermel. plan-
11:10 a.m.——"Legends of India."
Mrs. Helen Eldridge.
11:40 a.m.—Motion picture toro-
cast. Adele F. Woodard."
11:50 a.m.—Market and weather‘
reports.
4:00 p.m.~—Ethel L. Harrison. Io-
prano.’
4:15 p.nL—.Harry Sh'afran, violin-
ist. accompanied by . Mrs. Maud
Iv‘oote.
4:30 p.m.—-Francis E. Sims. bary-
tone. accompanied by Dwight Conn.
4:45 p.m.—Ralph Reichenthal,
pianist. ’ ‘ my”!
5:00 pun—Ethel Harrison. l0-
prano.
5:15 pan—Ralph Reichenthal.
pianist. '
5:80 p.m.—Children’s hour pro-
gram. .
6:00 p.m.——Dinner music.
7:00 p.m.——Manly Price Boone,
of energy takes place. The obvious
disadvantage is the addition of sev-
eral controls.
“'th Circuit. “111 Do
A decided advantage of radio
frequency amplification results from
the fact_that the effect produced
on the detector by incoming signals
is. in general, proportional to their
squartfthat is, of the strength of
the. signal is 'doubled. the resultant
effect on the detector is increasgd
approximately four times.
The actual gain in volume with
the use -of radio frequency will not
compare with that bbiained
with audio frequency but you should
find the strength of distant signals
increased by quite an amount.
Radio frequency requires careful
workmanship to keep all leads short
and direct as possible as to avoid
a feedback of energy between the
grid and plate leads of the tubes.
This is important for best results.
Tubes May Block
Radio frequency circuits do not
always function at their best when
first connected up. They may require
a little adjusting until finally brought
up to the point of highest efficiency.
The feedback of energy between the
elements of the tubes or the wiring
in the set may cause the tubes to
block. V
The word block is used to express
what happens when the tubes break
into self oscillation and temporarily
p'rcvent signals from going through.
The program will come in fine for
an instant and then the tube. will ap-
pear to shut off and the signal will
cease. A moment later it will reap-
pear.
In this case it will be necessary
to use a. potentiometer in the cir-
cuit. Connect the two outside con-
tacts of the outside contacts of the
potentiometer to the positive and
negative filament leads respectively.
(“unncct the leads from the rotor
of the variocoupler to the center con
tact in place of its going to the "A—-"
lead as shown in the diagram.
This will impose a slight positive
potential on the grid of the first
tube which should prevent the cir-
cuit from oscillating.
Copyright 1024 by the E. N. L.
Technical Syndicate.
SCARLET FEVER :'
Thomas Silk. 13. of 6 Ohio ave-
nue. is ill with scarlet fever accord-
ing to a. report made today to Dr.
Ilobert E. I’erdue. health officer.
FORFEI‘I‘ T\\'O $40 BONDS
Failing to appear in court to an-
swer to charges of reckless driving.
Charles E. Selmik and Catherine
Fcalberg forfeited bonds of $40
each yesterday. The two accused
were arrested Sunday on the Post
’Road by State Policemen Bushby
and Gutman. '
lrlulallc Jensen is playing the role
of Eleanor Rom-(iman's mother in
“Mary. the Third."
v diflicu in such localities. or
itegay be that reception to the north
is poor. while to the south. east and
west it is good. The general loca-
tion is quite important. It you are
located in the dty the chances are
that your range will not. be as great
with a. given set as will that of a
person located many miles out in the
country; and “you are surrounded
by tallJmildlngs it Is certain tha
your range will be considerably low-
erg-enthu- conditions must be taken
into account. Summer; reception is
not as good as winter reception.
nishfreception ,is practically always!
much better than'daylight work. It
the summer. when static is bad,
northern W 1111b. less sleet—
ed than musicals «heme south.
> . antenm.
“6:15:11 operation.
mm
But in anylocotion...ftho, distance
{HOPES TO SET NEW STYLE BY TAKING -
HER PA AND MA ON HONEYMOON
-lice reports.
8 p.
Chorus.
tenor. accompanied by Edgar‘Pln-
chef. Crissmon.
7:10 p.m.—-“The Brownie Ice
Cream Man." Kenneth Bevier.
7:30 pan—Harry Reser.
ton Fisher.
~7:40 pun—Harry Reser.
player.
8:00 p.m.—Orchestral selections.
8:30 p.m.—”chkly Digest."
9:00 p.m.-——Gla.dys GavreaTu. vio—
linist. accompanied by Marjorie Par-
ker/Dahl. '
9:30 p.m.—-"Pla.ce ofeSalads in En-
tertainments? Sarah Field Splint.
9:30 p.m.—Gladys Gavreau, vio-
linist. .
9:40 nun—Myrtle Ashby Essex.
soprano.
10:00 p.m.—Dance program by
Adolph Snyder's Orchestra.
“VIZ—New York City—455
1:00 rum—Henri Van Der Zan-
den's Trio. .
3:00 p.m.—At'ternoon Concert.
4:00 p.m.—Eleanor Gunn's Fash-
ion Talk. '
4:10 pan—Daily menu.
4:25 prim—American
Rifle Team.
4:45 p.m.——‘Home Beautiful,’ Dor-
othy Ethel “'alsh.
5:00 p.m.—-Jaek Small’s Orchestra
5:30 p.m.—-\farket reports.
7:00 p.m.-—"Dogs—Old English
Sheep Dogs" Frank Dole of the New
York Herald Tribune.
7:20 gm.—-"Financial
ments."
7:30 p.m.—Paul Specht's Orches-
tra.
8:15 p.m.——"Pltfalls of
ship." It. “I. Barrett.
8:35 p.m.—-—"Credit~—-1ts Functions
and Application," by A. A. Alexan-
der.
10:30 p.m.—Dance orchestra sel-
ections.
“'RC—VVas 'ngton—MID.
5:15 p. m.—1ns'ruction in inter-
national code.
6:00 p. m.~storles and Songs for
children.
7:45 p. m.—-Radio talk by Dr. Al-
fred N. Goldsmith.
8:00 p. m.—Song recital by Louis
W. O'Leary.
8:15 p. m.—Piano recital by John
Victor “'alsh.
' 8:30 p. m.—-Song recital by Ver-
ona. Horen. “
8:45 p. m.——Duets on guitar. Er-
nest Dcale and William De “Filters.
9:00 p. m.-—-"The Political Situa-
tion in “‘ashington Tonight." by
Frederick \V‘illiam “’lle.
0:20 p. in.—-—Concert by a trio.
9:40 p. m.——Song recital. ,. j
0:55 p. m. —- Time signals and.
weather forecasts. _. --
10:00 p. m.—Bon Levin in point-
lar songs. I 4‘
'WOO—Pluhdelphh—SOO j,"
11 a. XXL—Grand organ reclta’l.; »
12 noon-Luncheon music.
4:45 p. m.——Grand organ and
trumpets. .
7:30 p. m.——-Sports results and po~
Olympic
Develop-
Partner-
11:02 p. m.—Wca.ther forecast.
' \vu Y~Sclienectady—380
8 p. m.—Novelty program.
8:45 p. m.—"'1‘he American Lan-
guage," Prof. George Dwight Kel-
iogg. -
the l’ittsfield \Vorks.
' \VG R—-—Bufla.lo—8 12
1: noon—“feather. produce and
market reports. .
12:30 p. m.——0rgan recital.
2:30-4 p. m.-—-Concert by
dealers.
6:v0 p. m.—Dinner music. Vincent
Lopez Orchestra.
7:30 p. m.—-—Digest of day's news:
baseball scores. '
11:45 p. m.——Weather forecast.
‘\\‘BZ—Sprlngfleld, Mass—337
6 p. m.——-Dinner concert.
6:30 p. m.—Dance program by
Leo Reisman's orchestra.
7 p. m.—-Baseball results.
7:30 p. m.——Bedtime story for the
kiddies.
8:30 p. m.—'—Musical concert.
11 p. m.—-—Sumrnary of events.
General Conference of the Methodist
Episcopal Church.
WJY—NE\V YORK CITY
(405 meters)
7:30 p. m Anna. Jute, soprano;
s p.‘ m.——- roadcasting Broadway.
M. Griffith. byytone; joint recital.
Bertha. Brainard.
9 p. m.—“Na.vajo Indians." Dr. P11-
ney E. Goddard.
0.15 p. m.——.’ew York College of
Music Concert. ,
10 p. m.—"When Touring in Eng-
land." Frederick E. Emmons.
10:30 :1. m —‘Jolnt recital—Rose
Gabriel Tabib. pianist: Ruth C;
Bolder. soprano; Mme. Strelova. so—
prano. ‘ .
“'HN—NElV YORK CITY ..
(300 meters)
2:15 p. m. to 3:15 p. m.—Overture
and vaudeville acts.
3:45 p. m.——Bob schaefer's enter-
tainers. _
4:30 p. m.Bob Ward. and children
in popular songs.
4:50 p. m.—_Ja.ck Lanna: tenor.
radio
banjo 3
player. i
7:30 p.m.—-Sport talk by Thorn-g
banjo {
9 p. m.—Program by talent from '
. BUSINESS IS. GREA ;_
at our- .
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, If You’ll Come In Yourself—
- You’ll Know Why!
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- ROTON POINT PARK
SOUTH NORWALK, CONNECTICUT
NOW OPEN FOR THE
‘ - SEASON 1924 :
DANCING EVERY NIGHT
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Come in to See the New
OLDSMOBILE. SIX
DELIVERED
n ............$894._00
Auto Supplies and Repairing;
'A'ARQN KOHN
0 Railroad Avenue.
hm
5 p. m.—Loule Cohen's orchestra.
9:80 p. m.—-Lisa. Bickman. so-
prano. I .
7 9:40 p. m.—Ace Brigade} Virgin-
ians. ‘
10 p. nib—Selma. Alexander in poems.
10:10 1). urn—Classical program by
all Nations’ Association.
10:45 1!. m.-—Bertram J, Goodman’s
orchestra. ’
'J1:15 p. m.~—Fio Williams. so-
primo.‘ ‘ ‘
11:30 p. m.—Buddy Baldwin’s or-
chestra. .
' won—NEWARK
. ('405 meters)
12:30 1". Inc—Natalie Crane, “The
Janitor-‘5 Boy.” , ,
-..‘ 2:45 p. run—To be announced.
‘9 6:15 p. Ins—"Han. in theta-icon"
eateries-tor the children. '
7 mime—“Music While!o'u;pine."
m.'-'— Caldwell women's '
among 08 mm
Largest Stock of Refrigerat-
ing Machinery» and Supplies
in the East. . ,
POLLEY‘ .
Refrigerating sndSupply Oo.
‘ mm sums »
ARCTIC 10!. moms
1:20 p. uni—Rm at the day’s
r l
WEDEMWM
Shoes of f 1 860- l 8695’
Loaned Berounsbury-Mathewson '& Co. 7
On exhibition in our windows is shown some very:
interesting shoes of the Civil War period. Note? .
the comfortable difference in the shoes of today
with those of yesterday. '
MILTON ELWOOD
South Net-wall:
122 Washington fittest
a
A
Norwalk Chronicler