Evening star., 1923-05-13

simpler than tho novice would i'm
agine. Control of volume. voltages.
etc. is taken care of by the opera
tors on duty In the transmitting room.
The only visible evidence of broad
casting equipment in the studio Is
small bird cage on q pedestal.
During the broadcasting OF any
particular number only the announcer
and the persons actually performing
are ollowed in the broadcasttng room.
The remainder OF the artists who may
their turns In the reception ROOM
To broadcast a number. the an
nouncer signals electrically to the
radio operator that he is ready. The
on the current and the microphones
and at the same times illuminates the
silence" lights Announcement of
the number is then made to the bird
cage" the announcer mods to the ar
tist to begin and the music Is being
broadcast. During the announcement
OF the following numbers. the artists
who have just performed leave the
room quietly, and those for the next
number take their places. Thus the
program proceeds with very little in
terruption.
In broadcasting an orchestra or
group of singers the procedure Is
similar except that arrangement of
instruments and voices have been
work out so as to give the prop
erIy blended effect in the mfcrophone.
Circulars Describe Receiving Sets.
Very simple radio receiving outfits
are described in a series of circulars
issued by the bureau Of standards
and published at the request Of the
states relation service Of the Depart
ment OF Agriculture. The circulars are
fully illustrated.
The first two. which are bureau Of
standards circuars Nos. 120 and 121
describe receiving sets using crystal
detectors. Circular 120 describes the
receiving antenna and ground con-
nection also.
Circular No. 133 describes an cleo
tron tube detector unit. which can be
substituted for the crystal detector
In either Of the two sets previously
Circular No. 1877 describes telephone
shunt and series antenna condensers
and loading coil for use with the
simple receiving sets.
The fifth circular of this series is
circular No. 141. 1t describes an
audio frequency amplifier unit Of
such proportions that in external ap-
pearance 1t matches the electron tube
detector unit. One or two of these
equipment previously described to
amplify the signals detected by the
electron tube detector unit, or the
detector unit may be omitted and one
or two amplifier units used with the
crystal detector. In either case the ad-
dition OF the amplif1er units results in a
considerable increase OF the volume
OF the receiving signal and increases
the receiving range somewhat.
Copies OF these circulars may be
obtained from the superintendent of
documents. government printing Of
flee. Washington. D. c. The price of
circular 141 is 10 cents. The others
are cents each.
Opposed to Quiet Period.
Enforcement Of a quiet period for
amateur radio operators between the
hours of 7:3o and 1890 pm, as pro-
posed by the Department of Com
merce. would prevent the valuable
assistance of amateur stations in
emergencies. such as storms. floods
and wrecks. arising during those
hours. according to the American
Eadio Relay League board Of direc-
ton, ion. ,;hi which has submitted recon-.
through its secretary. Kenneth B.
Warner. A special meeting of the
American Radio Relay League board
was held in New York recently to
consider amateur regulations origin
ally discussed by American Radio Re-
lay League representatives and the
chief supervisor of radio
Since the period Of quiet hours be-
tween 1880 and 10 pm. Is now being
adhered to voluntarily by amateur
operators throughout the country and
has been extended in some instances
to the hours between 1880 and 1880
through definite local agreement. the
board considers II unnecessary for
the department to enforce this regu-
lation. ut is our conviction" the
recommendations state. that II trans
mission is prohibited between certain
hours, it will destroy, rather than
create. amateur cooperation with
the department.: whereas IL voluntary
quiet hours arc permitted, the past
records show that we can count upon