The watchman and southron. [volume] (Sumter, S.C.) 1881-1930, 1922-04-26
Two Kinds Of Noises
Mar Radio Concerts

New York, April 222-With the re-
cent spectacular development OF the
radiotclcphonc rs i means Of COM
munication and cntcrtainment and
it.: amazing popularity with the
American public, experts are now
nuSy deNising methods OF elimin-
ating the interfering noises that
often mar radio concerts.
One OF the latest methods l.. the
scouting detective automobile.
equipped with Il sensitive wireless
set and a loop antcnna, and en-
ployed 10 ferret out interfering rl-
aio stations.
The problems OF static and other
:nterferences that constantly inter-
rupt lectures by series OF strange
noises are discussed in the May IS
sue OF Popular Science Monthly,
which says:
These radio interferences may
come form one or TWO sources.
Many OF them are due TO ameburs
with powerful regenerative set:
who operate without understand
ing their stations. The remainder
come from the Most uncomfortable
force in the ra6io universe-static.
Collision In the Receiver
The real cause Of trouble can
usually be discovered by ar cXpe-
rienccd radio man. but the blame
should not be attached to any one
until it is definitely located. In a
locality which where there are
many transmitting stations. signals
from them may break up Il concert.
The allotment OF different wave
lengths TO their respective classes
Of transmitting stations thereorcti-
cally permits the concert and vari-
Gus messages to go out at the same
time with as little interference as
three trains would create for each
other ii they We're all cnroute from
New York TO Buffalo. but :-oing
via the Erie, Lackawanna and New
York Central respectively. In prae-
tice, however. collisions occur in
the receiver that sound like three
trains meeting at 4 common point
while running 4 mile 4 minute.
The remedy. when signals clash,
is TO find out where they come
rrom. after all efforts to tune out
the intruders have failed Every
sending station is required by law
10 sign its call letters TO each mes
sage by transmitting them in code
or repeating them with the voice
so that all who hear the station
may identify il. II the interrup-
ting stations does not give its call
letters. the district radio Inspector
may be asked To focus direction
finders on it and bring the owner to
justice.
BuzZcs from Power Lines.
"A very efficient receiver will also
bring in all sorts Of huns and buZ-
yes from cletric light and power
lines, trolley car motors, and ac-
;omobiie niaSnetos. Violet ray
apparatus may be heard at work III
boudoirs as may N-rays
boring their paths into troubled
human interiors, and lightning-rol
agents producing miniature elec-
trio storms. AN antenna that runs
parallel 10 wires near by Will pick
up current from them and produce
noises in the receiver.
The worst disturber OF the ether
is static Listen in while a thun-
der-storm is approaching and at
the same time watch with the eyes
for the lightning flashes. DO not
watch TOO long! Pull the lightning
switch and ground the aerial be-
fore the storm is overhead.
The instant You see The flash
YOU hear q grumhlc, srowl. or crash
in the telephone. This seems TO
prove the assertion Of the scientists
that radio and light waves travel IT
the same rate of speed.