Evening star., 1923-03-04
RADIO GOSSIP AND NEWS

RADIO COSS]
Marked improvement noted by the
listeners in the reception of the pro-
grams Of station WAY Of Woodward
& Lothlop since it resumed broad
casting Friday after nearly two
weeks OF silence has been due to the
complete reconstruction of the trans
hitting apparatus and the addition
of special pickup device. All gen.
orator and microphone noises have
been eliminated. making the signals
clearer and stronger.
Another improvement was made in
the station by the transfer of it's
broadcasting studio from the fourth
to the eighth floor. The transmitting
apparatus also was moved from the
fourth floor to a specially construct
ed radio shack" on the roof of the
department store.
The hum of the generator. one of
the bad features in all radiophone
broadcasting. was wiped out from
WAYS station by the elimination of
the generator and the substitution of
storage batteries for the fllament
current.
Further improvements in the sta
tion are planned with view to max
ing 1t one of the best in the country.
according to c. o. Fischer, manager
Of the radio department. The next
will be the erection of a new antenna
system.
The transmitting set was recon-
structed by William NJ Uhler. jr, one
of Mr.. Fischers assistants and tech
nical adviser in the radio department
Explains Different Circuits.
What are the relative capabilities
OF the double circuit and single
circuit receiver?
BY skillful distortion of certain
fundamental technical facts. the pub
lie, as well as the jobber and dealer
have been informed and. in some
cases. led to believe that the two
circuit tuner enables one to obtain
unusual results which cannot pos
sibly be secured with the single
circuit tuner, according to f. r..
Bucher. manager of the sales de-
partment of the Radio Corporation
OF America, who has taken the trou-
BILE to answer the Introductory ques
tion.
There are certain outstanding facts
in the situation. Mr.. Bucher says
which no amount of propaganda can
contravene. As outlined by him
they are:
l. The interference sometimes en-
countered in radio bI IoadcaSting re-
ception is primarily a problem of
broadcasting transmission, which can
be fully eliminated only by the en-
actment of suitable government
legislation that will enable wave
lengths other than $50 and 400 meters
to be assigned to broadcasting sta
tions.
=. No receiving tuner. whether it
be of the single or double circuit
type. will prevent two broadcast
ing transmitting stations operating
identically on the same wave length
from setting up interference in the
receiving set unless the signals of
one station are Of sufficient inten-
sity 10 drown out those OF the other
station.
3. Two broadcasting stations op-
Grating on nearly the same wave
lengths will produce an audible note
or whistle in receiving apparatus.
which no tuner of either the single
The cure for this problem is the as
slgnment of wave lengths to the
transmitting stations of sufficient
separation so as not to produce an
audible note.
The single circuit tuner will en-
able the listener to differentiate be-
tween two local broadcasting sta
ttons by one of two ways (a) by
connecting .0O1MF condenser across
the antenna and ground binding
antenna fifteen to forty feet in, length
and not of too great height. 1t has
been conclusively demonstrated that
a low antenna gives greater selec-
tivity than a high antenna-
Selectivity in regenerative receiv-
ing sets is primarily dependent on
the amount of regeneration Two
local broadcasting stations on differ
ent wave lengths will often inter
fere with one another on either the
single or double circuit receiver but
this Is due to the overwhelming pow
er of the transmitter, which causes
the apparatus to respond, even when
not accurately tuned to the trans
mitter. 1t has been demonstrated
beyond all cavil that interference set
mated on the single-circuit receiver
by. an antenna not exceeding forty
feet in length.
The originary regenerative set with
the double-circuit tuner gives from
90 TO 80 per cent less signal than the
single circuit with the same number
of tubes and the same general cir
cult. In other words, stronger sig
nails will be obtained in long distance
reception from single circuit set
than from a double circuit set.
For those who have interest in
long-distance reception as we'll as
local reception. 1t is sometimes ad-
visable to erect two single wire
aerials-one for long distance recep-
tion. which may be of any length up
to $50 feet. and the other for local
reception, which may be of any length
up to 40 feet. depending upon the
sensitiveness of the receiving instru-
ment. The small antenna enables
one to differentiate between local sig
nails, while the larger antenna can
be used for long-distance work after
the local stations have discontinued
Many users of broadcasting sets
are now installing two antennae-a
long one for ng-distance reception
after the local stations have closed
down and a small one or an indoor
aerial for local reception. The in
door aerial may consist of twenty five
to fifty feet of lamp cord concealed
behind> the picture moIding or h
piece of inconspicuous No. % wire
stretched across the corners of the
room. Listeners located up to fifteen
or twenty miles from broadcasting
station can often obtain all the sig
nal audibility necessary for local
work by concealing the antenna un-
der the carpet Of the living room or
the library of the home.
comparing collectively the advan-
tages of the two types of tuners
said Mr.. Bucher, it is clear that
the single-circuit tuner is by far the
most useful to the average member
of the family. as it enables picking
up far distance or local broadcasting