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£63
the mistaken
wl regen-
. 1 the only
. and that
are not
1,’ 1'3". we do not
1io frequency
1 titliize re-
Regard-
ious 11131111:
rm‘y am-
regenera-
1'» r;
oscillating
..:rs_ and this
. the owner of
' s' should he just
w . set in a
as the own-
"tier.
ll-‘re ls
a tuned
I 1'10‘ coil. The
’ the second-
rr—i the plate
:(Iio F lequency Amplifiers
L filize Regeneration
fines ,..
tuning device ‘B' might take the
form of a variometcr. \ow we all
know that with such an nuance-
ment it is an easy matter to get rc-
generation and osci' ation because of
the fet‘d- hack xxhir-i talus place
through the tube itself. -:
The usual t"pe. of fixed radio-fre—
quency amplifier can he remesented
exactly the same -s }- ig. l. .. except
that the values of “A" and “B" are
fixed. They are hioadly tuned, so
as to eovex a hand of \xaxclcn"ths,
but they are tuned to each other
more or less. and in operation the
amplifier will usually oscillate and
regenerate quite easily.1n common
practice a potentiometer or “stabliz-
cr" is used to introduce losses in the
circuit to cut doxvn this regenerative
tendency sufficiently to keep the cir—
cuit from oscillating, but it is a. re-
generative circuit just the same.
litany of the. present day ampli-
fiers employ variably tuned trans-
formers. these often taking the form
of a tuned impedance, as represent-
or! by “A." in Fig. 2. A little study
will show the reader that the tuned
impedance “A" is nothing more or
less than a. variometer in the plate
of the amplifier tube. and we all
know that a variometer in the plate
circuit of a tube will tend to make
oscillation and regeneration. So: here
again our radio-frequency amplifier
is nothing more than a rcgeneartive
circuit. It you are using an ampli-
fier similar to that in Fig. 2. there-
fore, you must take care to keep it
below the oscillating point it you
don’t. want to annoy your neighbors.
Neutrodyne circuits are nothing
but regenerative tuned amplifier cir-
cuits in which the regenerative ten-
dency is subdued by the use of spe-
cial transformers and the neutraliz—
ing capacities. Some readers will
say that. most neutrodyne circuits
do not tune the plate circuit. but
the grid circuit only. Let us consid-
er Fig. 3. Here is a. radio-frequency
circuit in which the plate coil “X"
consists of twelve or fourteen turns
of wire, untuncd. but coupled close-
1 yto a tuned grid coil, “Z." This is
the form of construction usually fol-
lowed in neutrodyne transformers.
Now, although the plate coil “X"
is not directly tuned. it is coupled
so closely to the tuned grid coil “Z"
that when the grid is tuned the plate
will be tuned also. So here again
we have our tuned plate circuit,
with the attendant regenerative and
oscillating tendencies.‘
One way in which we can avoid
oscillation in the type of amplifier
shown in Fig. 3 is by making the
plate coil “X" of :1. very small num-
ber of turns—say from two to five
turns. This coil is then a) small
that it will not be tuned by the tun-
ing of “2." but do not think we have
eliminated regeneration. “'e have
only reduced the tendency, and we
have reduced the signal strength in
the process. In fact, it is safe to
say that. a, desirable radio-frequency
amplifier is one \vhich'takcs full ad-
vantage of regeneration, but in
which We have the regenerative ten—
dcney well under control.
Copyright, 1024. by The American
Radio Relay League, Inc.
Protected By A “'lndshicld
(Exchange)
Thomas Edison. when asked by a.
loquacious lady What his secret am-
bition was. replied: “\ladame, I
have alxxays had a. strong desire to:
throw an egg into an electric fan.‘ '
ZAYAS‘wms'SUPPORT IN STRUGGLE WITH r
CUBAN-REBELS WITH BRAVERY AND RADIO
L
-Pru!dent Alkodo Znyol broidcssfing on appeal from his oficc in (ht
presidential palace in Havana.
Where other executives have hidden themselves away while tlu
shooting was oin
WP
open way into which he is handling the situation. He is
mPresldent Alfredo Zayss of Cuba is winning
is a do in his battle with revolutionarydgilenients by tho
'ding his that
between revolt scenes. the first executive ever to do so, and the precl-
dentin!
where he has radio equipment in his ofiot
to bros cost appealzto toll“: people.
'CLASSIFIED ADS give the
for the least.
-.
Mothers" Day
Titliers’ Day, which will be observed on Sunday, furnishes splendid proof of
'1' - x 1 mt of modern civilization. The utilization of latent energy in the air, in the
. .. and in rivers and oceans is proof of intellect alone, which of itself is but a one
I development.
ilwognition of the patience, the kindly spirit, the loving watchfulness and care
have protected us in youth and guided us in after years represents a develop—
' .lfl‘l‘lel': than that of cold intellect alone. It' 18 a development of sentiment that
t (L
1
:n (‘10 with the soul of mankind, without which there can be no true civilization.
1 11 Piggly lViggly we endeavor to maintain a spirit of courtesy and friendliness
’ appreciation. Whether or not such a policy adds to our business volume is en-
‘ secondary to the indisputable fact that it makes business much more pleasant
l to much more worth living.
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WWW
fielded aid
on W .-
Condensers and
Tubes at Fault
By CHARL'ION 1-1. BUTLER,
Radio Lnglncer.
It 3our iellex set \sorks poorly,
the fault may lie in your vacuum
tubes. ‘31 dci‘ccthc tube will allow
signals to come through but your
art will seem. to be without any
"rep." .
11' you have an extra tulle avail-
able, tiy ch.111;\1g it tor the tubes
you are using in the set. Shifting
the position or the tubes around.
Try the, lirstt uhe in the second
socket and so on. - A great many
times this is_:1.ll that is necessary to
improve ilic performance of your
set. a. great. deal.
The condensers of a radio set
should feelvo more attention than
is ordinarily paid to them. In the
case of variable condensers it is im-
portant to keep the plates free from
dust. Dust {arms a. poor electrical
insulator or dialeclric and will
greatly increase the losses of your
condenser. Clean between the plates
of your condenser frequently with
a thin strip of soft. clotn or a pipe
cleaner.
The fixed condensers should be of
' the Pretoria Museum.
.wagon. practically as sound today as
: one at these is now
resided
the mica. type. The use of waxed
paper or other forms of dialectric
is risky. The best, grades or. paper
have minute holes through their
surfaces that will allow small ’quan-
titles of current to leak through or
will allow the condenser to break
down under high voltages.
Avoid paper condensers that are
not sealed in wax or some other
medium to exclude air and moisture.
Ordinary paper will absorb moisture
and thus change the capacity of the
condenser.
Do not buy cheap condensers, for
they are usually nowhere near the
capacity tlu: are rated at. A .0005
M. F. condenser may be nearer .005
M. F. than .0005 M. F. If your cir-
cult. calls for certain capacity of
~condense! and you use condensers
of a. different capacity it is not
reasonable to expect that 3011 will
have satisfactory results.
Secure several extra. condenser:
and try interchanging them with the
ones in your circuit at the present
time. It may be poSsible to improve
your receiver in this manner.
Relic of South Africa.
An interesting relic of the Voor-
trekker days is to be presented to
It' is an ox
it was in the days of the Great Trek
and with the old fashioned applianc-
es. Many years ago a. Dutch farmer
bought the wagon at an auction.
took it to pieces and stored it away
in a loft. The old wagon brought a.
Voortrekker family from the Cape.
through the Free State. over the
Drakcnsberg and into Natal. After
the annexation or Natal to Great
Britain in 1843 it came back over
the 'Drakensberg and through the
Free State to the Transvaal, even-
tually coming to rest in the Wak-
werstroom district.
Some Record of Age.
The Grange at Dalton, Massachu-
setts, recently celebrated 50 years of.
continuous active existence and with
these noteworthy featuresz—Durin:
the entire halt century this Grange
has never missed holding a regular
meeting twice a month during tint
period; five or the original ~-
members are still living. In ..
good standing and acting
FRIDAY.
(Daylight Tlrné,
‘WEAF—V‘EW YORK CITY—402
11 A. M.—Ka.rlyn Wells Busett.
soprano.
11: 10 A. Ill—“American Musi-
cians." Oliver Lipplncott.
11:25 A. M.——James Stanley bu-
so.
11:35 A. M.— "Lessons in Swim-
mlng" Fred C. Mills.
11:50 A. M.——Market and weather
reports.
3 P. M.—Concert in behalf of the
New York Music “’eek. American
compositions will be sung by the
following artists: Louise Hubbard,
Alice Godlllot, Mary Potter, Charles
Stratton. Everett; Clark and. Lewis
W‘llliarnson. These composers will
be at the piano: Robert Bralne,
Frank La Forge. Charles Fonteyn
Manney, Harriet. “'aro and Mrs. Ed-
ward MacDowell.
5 P. M.—Irving Klase, violinist.
7:20 P. 11:—Florence Balmanno.
contralto. ,
7:30 P. NIL—Dally sport talk.
7:40 P. M.—-Florcnce Balmanno,
contralto. f
7:50 P. M.—~“Tho Much Abused
Doughnut." Olive S. Allen.
8 P. M.——“The Happiness Boys.“
Billy Jones and Ernest “’are.
8:40 P. M.——Talk by Major A. A.
Stewart.
8:50 P. M.-—Muslc.
' 9 P. M.~Orchestra’selectlons.
10 P. M.—“Secrets of the silver
Shops." George E. Fahys.
‘“‘JZ—XEW YORK CITY—455
1 P. M.—Henry Van Der Zanden‘s
Trio.
2 P. M.—_—New York Board of
Education program.
3 P. M.-—0rgan recital.
4 P. M.-——‘Baseball scores every
fifteen minutes.
4:05 P. M.-Eleanor Gunn's ta-
shion talk.
4:10 P. M.—"Concernlng the
Young Child." Mrs. Adeline Rois.
4:25 P. M.—Cora Moore, "Fa-
shions of the Stage."
4:40 P. M.—“Kandy Kiddies,"
Sarita MacLeary.
4:50 P. M.——Arts and decorations.
5:15 P. M.~——"Systematic Psycho-
logy." Dean James E. Lough.
5:45 P. M.-—Market reports.
7 P. M.——-Thorton Burgess.
7:10 I’. M.-—Motor Camping.
7:20 P. lit—Financial develop-
ments -ot the day.
7:30 P. ILL—French lesson.
8:15 P. M.-—Fordham University
Glee club.
9:15 P. M.—-—American Legion
night.
10:45 P. M.—Poul Spccht’s or-
chestra.
‘WJY—‘NEW YORK CITY—405
7:30 P. M.——Income taxes.
7:45 P. ISL—Ruth Warburton, so-
prano.
8 P. M.—Current topics.
8:20 P. M.—Coli1mbia. University
Instrumental club concert.
10 P. ILL—Joint recital.
10:30 P. M.-—-Talk.
‘\VHN—.\'E\V YORK CITYAOO
2:15 to 4:30 P. M.——Songs and
piano selections.
4:30 P. M.——Popular music.
5 P. M.—Ed “'inston's orchestra.
9:30 P. M.—- Terrace orchestra
selections.
11 P. M.——K. I. K. entertainers.
11:10 P. M.—-—Fred Whitehouso in
songs.
11:20 P. M.—Stcamship City or
Scatlle Orchestra.
11:50 P. M.—Jsck Malone, sing-
ins.-
11:55 P. M.——Alex Cantor. singing.
'WOR—NEWARK—dos
2:30 P. M.—Raymond G. Parker.
tenor.
2:45 P. M.——Joint program by
Gitta Rapoch, soprano; Eleanor
Freeman, contrnlto.
3:10 P. M.-—Famous women series.
3:20 P. M.—Henor solos.
3:30 P. M.——-Joi:it program.
6:15 P. M.—Songs tor children.
6:30 P. M.——“Man in the Moon
Stories."
7 P. M.——Kraoutzer String Trio.
7:25 P. M.-—-Resume o: the day's
sports.
‘WAAM—N’EWARK—Bzo
11 A. .——Progra.m of instrumen—
tal and vocal numbers.
12 M.—-Luncheon concert.
'WOO—PEILA‘DELPEIA—dol
11 A. M.—Organ recital.
11:30 A. M.—Woather forecast.
12 M.-—-Luncheon music.
12:55 P.’ M.-——Tirne signal.
4:45 P. M.—Grand organ and
trumpets. -
7: 30 P. M.—Pollco reports and
sports results: dinner music.
8: 30 P. 11:—Special theatre pro-
gram.
9:10 P. M.—Artlsts’ program.
9:80 P. M.-—-Grsnd organ recital.
MaryE. Vogt. ,
10 P. M. Dance prom-tn! by
Earl Gresch’s orchestra.
10:55 P. BIL—Time signal.
11:02 P. M.—Weather forecast.
11:03 P. EAL—Continuation or
dance program.
‘WGY—SCBENECTADY—sso
8:45 P. M.—Plny.r "Dangerous
People, " by Oliver White, presented
by WGY players.
11: 30 P. m—WGY Quintet. Jo-
seph Derrick. piano, and Ida Mao
Paul. soprano. ,1
Will—SPRINGFIELD W7
12: 55 A. M.—Tlmo signals.
6:00 P. M. —- Baseball results:
dinner concert by the WBZ Orches-
M.—"Pep Smith, Pinch
Club meeting.
7:30 P. LIL—Selected
Charles L. H. “'agner.
7:50 P. M.-Health talk.
8:00 P. Ill.—Muslcale.
9:00 P. M.—Populnr songf hits.
KDKA—PITI‘SBURGH—azo
2:15 P. M.—Concert by Brandy’s
orchestra.
12:55 P. M.—Time signals.
3:30 P. M.—Baseball scores.
6:30 P. M.——Organ recital.
7:00 P. M.—Baseball scores.
' 1:30 P. M.——“thtle Red Riding
Hoo‘ ."
8:00 P. M.—Baseball scores.
9:00 P. ILL—Concert by
Ladies' Chorus.
Vi C AE—MPI'I‘TSBERGH—462
12: 30 P.M .—News.
3: 30 P.M .—Latest news bulletins.‘
4:30 P. M.—Spcclai children’s
program.
6:30 P. lit—Dinner concert.
7:30 P. M.—Unclo “Kaybee.”
8:30 P. M.—Musical program.
“'RG—WASHINGTON—ddfl
5:15 P. M.—Time signals
weather forecasts.
6:00 P. M.—-Stories and songs for
children.
\VCAP—WASHJNGTON—dOO
8:00 P. It .—“Sparks From the
Political “'heel," Frank R. Kent.
8:20 to 10:00 P. M.—Concert pro-
gram.
10:00
verses by
the
and
to 12:00 P. ISL—Dance
music.
8:80 P.
Anne
O'Connor. soprano.
WDAF—KANSAS CITY—411';
9:
concert.
12:45 A.
with Coon-Sander's Serenade”. ,
8:
of American Pen “omen.
\\ OC—DAVENPORT,
1:
3:
4:
musical numbers.
6:
500:1“.
10:00 P. M.—Tourists' road bul-
letin. n .
WGX—CHJCAGO—Sfll a“ :
8: 00 to 11:00 P. M—Songn ml
Dell Lampe‘s Orchestra. .1; ,
8:
igan banquet proceedings.
9:
Propoeius School.
8:
Ensemble and quintet.
11:00 P. M. —Ja.ck Chapman's 011-: '
rchestra
9: 30 P. 111. ——\aried program.
“'3 AP—FORT \VORTH—47c
8:
Dreys Choral Club. .
10:30 P. ILL—Program by artists
6:
7:
WWJ—DEI'BOIHI!
M.—0rchestrl. ”ism
Campbell and
I
mm
M.—Barstow Glee (HEEL;
M.—Nixhthnwk troll-33' 1
00 P.
WEB—KANSAS CITY—411 v.6
00 P. M. —Program by It!“
. 3? v
IOWA—3‘
725‘:
00 P. M.——Chlmes concert.
00 P. M. —Stocks and mum“? ,
so P. M.-—Educational process:
45 P. M.—-Chlmes concert.
:30 P. M .—Sa.ndman's visit. a},
:50 P. M. —Sport news. '14" '
:00 P M. -—E__ducationa.l tectuFG.
:00 P. M.—Muslcal program.
a;
‘5 RLAQ—CHIC- AGO—448
30 P. M.—Unlversity of lilo-TE“!w
50 P. lit—Orchestra. from 95'
WDAP—cmcsoo—uo ’:
00 P. M.—Dinner concert, Drag! 1
WFAA—D ALLAH? O
30 P. M.—(10ncert
RGO——OAKLAND—312 . ‘
00 P. M—Short musical 515;;
gram: 3. discussion of art. ’ ' *
00 P. M. —Concert orchestrl. ”l
45 P. M—Stock Exchange“ ' i
9:
USE YOUR
STOCK
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Store
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Norwalk Chronicler