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RADIO NOTES
By."CONDENSER"
The actual power of the cur
rent picked up by a receiving
Saerial, in respect to our low pow-m :
er transmitters;, is less. thtii that
Utilised by a house-fly wialking.
1upl the wvall.
The valves in your set amplify this
power millions of times. Oswiig to
the low power transmissions yoil re
quire nlulti-valve receivers, which not
only multiply the. signal strength, but
also the sources of interferenc and
back-ground noises. A powerful re
lay station would mntean less valves
rcquired, less costly receivers, a less
noises,and improved reproditction.
The human ear is responsive to
sound -vibrations friom about 15 to
12,000 cycles per second. V'ery few
receivers reproduce sounds above
6000 cycles per secbnd, tlius thie bril
liancy of the .high.notes is lost: The
reason for this is that. Receivers
must be super-selective .'to separate
the various stations. on: the . wave
band. ... Recently, variabile selectivity
has come into. use, whlch means that
with a Local Relay Statitn you can
lessen the selectivity and increase
the brilliancy.of reproduction.
Sound waves traivel at thle ,ate of
1087 feet per seconid; ltadio waves
travel at thie rate of 186,000 miles, or
approximately eight times round the
world per second..
In thile. event of a' local thundcr
storm it is advisable to disconnect
the power plug from tthe wall socket,
as the power'mains inity recelve a vio
lent electrical charge from a lightn
ing flash, which can damage your re
ceiver. All aerial lead-in wires should
be connected to a lightning arrrestetr,
thie other side of which should have
a good earth connection.
Owners of superhet, receivore
should not try to adjust trimming
condensers or intermediate trans
former adjusters. Without propler
instruments it is impossible to adjust
these correctly, . Let your mechanic
attend to this.
If yrou want 100 pet' cent rcopilon
of national programmes, j in the
Listeners Leaute anid blelk i t the
efforts of, the League t?o this purp se.
$