7 I: is generous? conceded that the
at type or radio frequents en:-
- "her is that employing some form
' tuned trunstormerl; that in. in
hich each stage 0: ratio frequency
.cpl‘izication is separately tuned to
e incoming signal. A big disadvan-
ge be tuned amplifiers hovered :5
o tendency to ”dilate. when the
3-: armors are tuned exactly to
e incoming signal. unless special
ethods are adopted to stop. eucli-
non. each u in the mun-crime.
here we use special transformers
'«d smell condenser: usually refer-
. to as “neutraltn‘ng capacities."
In the radio frequency amplifier
< be described today, we make one
tuned stages of
us insuring mannium signal
’ ength, and yet we eliminate oe~
' lemon without resorting to any
eclal apparatus. nor to a potentio-
eter control, which is antitank-able.
The complete diagram for a. one-
p amplifier and tube detector m
cm above. The construction in of
simplest, and will present no
ciai ditticulties to the amateur
'- ider. The antenna tuning arrange
eat. ‘31" comprising calls “A" and
" is made by taking a three-inch
{rdboard tube and winding on ten
33 of No. 23 single silk covered
{£91.
. he. the brighten: of the
He entertains the whole
y with radio music, news,
- —di£ferent every day.
e helped him - told him
,, tthesets baringthemoxt
n
Norwalks’ Elec. Co.
9 11 No. Main St. a...
{Tel 2978 186.110“
1...»... Wm“ uwnl‘uqm melmmww
amplification.»
. tuning transformer "T"
wire. Then lease a space or ,
inch; no wind on 45 turns 01 the
some use wire or used tor them
winding. {The ten-turncoil is wed.
tor the primary 7A" and lo beckon
up to the aerial and ground. the end
of the primary nearest the 45 turn
coilbeinguned for the ground wire.
the 45 tin-noon. in conjunction with
a .9905 mid, (89-1)”) Sirigle coni-
tlensex- tom: the mostly, ad is
connected as shown. with the A far-
tlieet from the primary winding
being used for the. grid. connection.
No potentiometer is used.
We now come to the construc-
tion of the radio frequency trans-
former “RT" composed o: coils T—I
and 1-2. This trenatormer is of the
same general construction as the In-
itiai inning tmnstomer, and is
made by winding six turns of No 2;
single sin: covered wire on a. three»
inch tube for the primary, T—l. then
leaving 333.3: of about 8-18 or 1-4 or
mmcmandwlndlngonfiturnaof
wire for the secondary, '1‘ 3. Note
that in hooking up the transformer.
the end or the six turn winding near
eat the secondary goes to the pofl—
tivo “B” buttery connection. while
the tax-tile:- 4 end goes to the plate.
In the large winding. which is‘used
with a .0905 d. variable con-
denser as a. tuned secondary. the
end nearest the primary goes to
the filament. while the farther end
goes to the grid condenser.
:There is nothing else particular-'1']:
ly fllfilcult in hooking up the set.
I; might be well to place the initial
and me
1‘. t. transtormer “RT" at right anx-
les to each other. especially if they
are close to each other. UVzol-A
tubes will probably give best results.
but any other kinds may be used in
the set.
In the operation at the outfit. the
two variable condensers are tuned
simultaneously,’as in the neutrodyne
This may require a. little practice to
do Well. Thexnisnal strength should
be quite gown. but the experimenter
might try placing & variometer in
the plate circuit of the getector for
getting possible gain in signal re-
590%
I: desired. or come. another stage
of radio rmq’uency amplification, 0:!
the name construction as given, may
be used to advantage. while any
number 0! audio stages may be
added in the max manner. A'vew
good set for broadcast work would
incorporate two stage: or tuned ra-
dio amplification, a. detector, and
wastage: of audio amplification.
- In documents tn the treatment
or certain diseases patients in a
London hospital are‘kept in a sealed
gins room containing twice as
much ozygen as in ordinary air.
P-fiy-A-Children‘o Eon: by :1
Pm: Albion.
was r. 3:1.th our.
8: 0909- Inn—Son: Racial by n.
bert Solicitor-man.
berttone. g
3:15 p. Dir—5008 Recital by Eoee'
Polite. mom soprano.
8:39 p. m.-—— -——Piano Recital. r
8: 45 p. m.-—Concert or new
Music. '
9: 00]). xii.—~Song Recital by My
Shreve Heal-tam.
9:15 p. tor—Song Recital by Fren-
ces -P. Heartsill. content).
9: 30 p. etc—Concert by the Ariny‘
Basic school. ,
9: §5 p. m. Time signals and, woe.
tbre forecasts.
,~ 10: 09 p. xxx—Concert by the Anny
Mimic csbool.
WJZ, N. Y. 03”. v
(455 Meters.) ,
8: 00 p. rue—Wanamaker Goncoxt.
4: 09 13.13: m.-—Tee. Concert by the
Hotel Belmont Stringed Ensemble.
5: 00 p. m.——George Leech. barb
tone. . ‘
5: to p. m—F‘ederal and State
Agricultural reports:-
Home reports; closing quotations 0!
the New York Stock Exchange: tor-
eign exchange quotations: Brad-
street's financial report; Evening
Post News. .
, 7:00 p. m. —- Bowen-d Garls'
"Uncle Wiggily Stories."
7:20 p. m.—-Mrs. E. E. Buchar,
"Be Kind to Animals," ".A True Dog
story it .
8:15 p. m. —— Vincent neuritis.
violinist.
9. 00 p. m.—-Mrs. E. E.~
"Progress of Humane
ughout the World."
0 p. m.—A.11ce Ketculf. sopra-
Bub”.
Forces
no.
10: 00 p. m. —- Fairchfid Chapel
Quartette Concert.
11: 00 'p. m.--John O'Proy. tenor.
KDKA, East Pittsburgh, Pa.
(328 Motors.)
9: 45 a. m.-—Union Lire Stock ro~
ports
11:65 a. art—Arlington time yet:-
nels.
12:99 noon—Weather For“;
“12:20 1:. art-Lenten oervicee or
the Trinity Church. Pittsbur 1’3.
1: 30 p. m.—Concert by uglier-
ty 5 Orchestra. -
6: 15 p. m.—~Dlnner Concert by
the Westinghouse Band.
7: 20 p. to. “Sport:
James L. Long. 7
story by Dr.
7: so 1). m.—-The
David Lang. .
7:46 p. m.-—“Lost Minute Helps
to Teachers, 01 Adult and Secondary
Classes " Carmen Cover Johnson.
8: 00 p. m.—Feature. “
8: 15 p. m.-- "Inter-nation“ Rela-
tions, in the Light of History." Prat.
W. A. Clown.
- 8:30 p. m.——Chamber
merce Dinner.
9: 55 p. m.—-Arllngton time siz-
naia. Weather torecant.
WBZ, Springfield, ms.
(887 Metal.) - ’
11:55 a. m—Arlinzton. time eig-
nais: weather reports; Elston ma:-
,1"
Rm“...
0: , Com-
Fez-mend:
_' or Chicago Sunday inverting club.
W
1 the Smith comm
: aerobic.
9:21;!“ mum LN "
1r tux on W: m
Tosfihefi mom." ,
’ 0 ’. m. —=- Geno Installing
Boll Record Orchestra.
55:; eldvo 3°»!qu *
cinnam‘ o: Teeter: mm;
0:49 1:. m.-— outta! by Edith
nukeldey. soprano. , .
10:00 9. an. —- “Stake W
(Ronni!) presented by n choir
60- voices or St. {Joseph church '
Newark.
.
)
1: 45 9. m—Foreign Policy m- >
elation Luncheon. ‘
'400p.m.——DenceProxrombytbu»
Mount Royal Orchestra. '
5:00 p. inn-Elinbe'th Plenum.
Soprano. .
7.30 1;. Wu! Whitemu uni!"
8:30 p. Ian—Special prom by
the Broom Industrial Expo-men. -
9: 80 p. m.——-Bophio Irene Look.
well-known writer.
9:40 p. Ins—Ron, amount can»
trulto.
8:55 puma-Fremo- Ohm
Cellini;
19:10 1!.
Tenor.
10: 25 p. nip-altos: Hamilton Con?-
treito. .. .
10: 35 p. m—B‘nnces Chi-Minor.
Celiist.
19: 59 p.
Tenor: , ,
11:00 9. m.-—Vlneent Lopes on;
His Orchextre. ’
m.--—Almndor Janice,
m.——Alennd'er «an; -
sum:
we: More, than .
(no W) . ‘
4: 001:. ~"Adventure Hour.” _
Concert“ arranged by In. 1K. P. Gin
tor. Soprano. »
8: 80 1:. Ina—Talk. Mannie.
3:19.33. in.-—-The e: .
menus! the Boomerang-Lori
Jesus Christ. Raul by 84?. m
F. Guerra. ' .'
4; 00 p. inn—Organ recital. _. ,
4: 45 p. m.-—Vesper more at the
Shadyside Presbyterian came.
6: 30 p. law—Dinner concert.
7:45 p. new—Service. o! the m :
Baptist Chilton... . ,_
Km chic-co, Illinois
(539 Meters)
11: 00 a. m.—-—Centrai Church oer-
vice. ,
7:00 p. m—Preilminm" ‘
8: 00 p. lit—Rein!“
the Chicago. Sunday
mos: Hotness: ' T V L
10: 56 a. nit—Chum: mm 1
e:
5'00 9- lib—Leo W'l
7:80 mm. m I
3: 00 n. m.-_-Fore Housman:
‘ isle.
9: 80 p. now—mm '
Siobhan: Orchestre.
7:89 ‘p. mewsuvico or
Chin-ch.
Norwalk Chronicler