Evening star. [volume] (Washington, D.C.) 1854-1972, 1924-06-30
new RADIO DEVICE
HELD BIG ADVANCE
Multiple Work on Single An
tenna to RevoIutionize
Household Receiving.
BY CARL H. BUTMAN,

NEW YORK. June 3o.-The radio
Invention of DR.. A. H. Taylor and L.
C. Young. permitting multiple recep-
ton on q single antenna, may prove
as revolutionary in ordinary house
hold and apartment reception as 1t has
In the Navy aboard fighting craft.
Naval warships, by employing this
principle Of receiving on one antenna,
are able to receive and transmit sew
eral messages at once. With its ap-
plication to ordinary broadcast re-
oeption. 1t will be possible for each
city block or suburban neighborhood
to erect a community antenna for the
use Of all fans in that section with
out Interference. Any number OF sets
may be tuned to special stations on
the same or different wave lengths.
new name has been given this de-
vice. known in the Navy as the coup
Is ''unitenna," according to Edward
II. Loftin Of New York. who Is hand
ing the device for the inventors.
several radio fans, using these de-
vices and a community antenna, can
twist their tuning knobs at will with
reception. il more than one receiver
Is connectee to the same antenna
whenever one set owner twists his
knobs to hunt for a station, he upsets
the others adjustments, and it is
easy to appreciate the pandimonium
that would exist II twenty-five re-
ceivers were connected to the same
antenna, each owner trying to satisfy
his own searchings. With the uni
tenna device, this difficulty Is over
come.
No Vacuum Tubes or Batteries.
the present device does not en-
ploy any vacuum tubes or batteries.
properly adjusted electrical con.
StantS, and can be built as a unit
attachable to any commercial re-
.ceiver and be built into any design of
receiver.
The Navy has had the device in
use FOR some time. the necessity hav-
| ing arisen for receiving a large num-
! Der OF communications on short wave
| lengths at the same time. 1t is i'm
! possible aboard ship to rig up all
the separate antennae that would be
| necessary to give each receiver a
| collecting agency. The Navy. realiz-
ing that this feature is undoubtedly
valuable to broadcast receiving con-
| ditions, has consented to the disclos-
| ure Of the arrangement for CONNER
I
| are found, but as yet no arrange
ment has been made with any one
| for manufacturing. For this reason
1t is not desired to publish in detail
the circuit arrangements. but paten,
! applications have been filed.
The "unitenna" unit should meet
with great favor by apartment houses
| and hotels, as we'll as in community
blocks. for it permits the construc-
ton Of one good efficient antenna &c
Dc
, sire to use IT. All of the receivers
| connected to the one antenna must be
! provided with the "unitenna" unit. in
order that the system as whole may
| be a success. This, of course. would
! be a matter of regulation by the
| apartment house or hotel. or a mat
| ter of understanding among neigh
| bors in a community block employing
! a single antenna-
| Held Extremely Selective.
| Besides its unique value in multiple
| recep tion, "unitenna' is said to DC
| extremely .selective. bringing stations
| in on an exact setting Of the tuning
/ condenser and cutting out all other
! stations Strangely enough. the set
! ting of the dial is always the same
| the device is connected. In other
| words, the dial may be marked by
| the manufacturer with the names Of
stations and no matter under what
| conditions 1t is used the settings re-
| main the same. except when the trans
| hitting stations change their wave
! lengths or power.
| a model of the device. set up ir
| Washington with a reflex receiver
| showed WCAP at 59.4 degrees on thu
| tuning condenser dial, and the setting
| is exactly the same for WCAP in New
| York city on radio frequency re
| ceiver. This setting is SO sharp tina
If il is turned to 50 or 60 degree;
the station is gone. This makes tn
unit most valuable. even when no
used in multiple reception work. bu
as a selective device to cut out nearb,
| interfering stations. 1t is PARTICULAR,
! useful on radio frequency sets whlcl
are broad and are not selective wit
ordinary tuning devices
Reduces Effect OF Radiation.
"Unitenna" is also said to be
great aid IN reducing the effect o
| radiation from q receiver OF the re
generative type. which "Squeals" whe
, improperly operated. Its selectivit
also helps to reduce static trouble,
as the static is by-passed to GROUND
| except on the very narrow band
which the unit is tuned. BY a simpl
connection 1t may be converted int
an effective wave trap, Selectivel
trapping out nearby bothersom
Copyright, 1924
AS an added safety measure it