The Filer record. (Filer, Idaho) 1919-1930, 1922-04-27
THINGS BEGINNERS
MUST LEARN FIRST
Explanation OF Terms Used in
Radio and OF It's Basic
Principles.

Due 20 the great Interest taken ln m
do since broadcasting stations hay.
been started. many radio terms mr.,
seen and heard that may be unfamiliar
90 The novice. Some OF the most com
monty used terms are explained and
defined below
Like light heat and sound radio
energy L. propagated Ia the form of a
wave motion Every one h familiar
with the wave motion set up on the
surface Of "a sin body of water by the
dropping ~ a stone into H.
Every time point on the surface
OF the waves goes through complete
set of motions and starts To- repeat
those motions the wave IL said 10 have
gone through n cycle.
The number Of complete cycles gone
through per second II the frequency.
The human ear Is responsive to
sound frequencies up to few thousand
I cycles per second bur II not capable Of
responding 10 the higher frequencies
/ encountered In radio Arbitrarily a
/ Frequency Of less than 10000 cycles
T has been called an audible frequency
-one which can be heard and fre4
quencies above 10000 cycles. radio or
inaudibie frequeucles because they
cannot be heard D., the human ear
The particular type OF wnpe which
propagates radio energy IL an electro
magnetic wave An of us have seen
bits Of iron and steel attracted by the
little toy magnets made 40 Ia the form
Of horseshoes. This attraction ~ the
magnet for the bits ~ iron aud steel I
showed the existence Of magnetic 4
field about the tips of the magnet and
this same kind ~ field propagafes
the electromagnetic force. except that
unlike the toy magnet. ~ power comes
on In the form Of wayy motions. This
electro magnetic force propagaies ra-
do energy IN all directions
The medium that transmits the cleo
trouagneflc waves j. the same me-
dinm that transmits Light the ether.
This medium Il supposed to on all
space even that occupied by fluids and
solids Little H. known shout its prop
critics.
IN radio Il "a more common 10 speak
u wave length than frequency The
wave length ~ any wave motion IL the
distance between any two successive
crests 10 the same direction. The
wave length depends upon the fire.
quensy n the frequency IL high the
wave length u shnrt ON ihe other
hand n The frequency II low The wase
length j. long Numerically the wave !
length a equal 10 the distance fras- !
Filed bi the wave ~ sar Second divided :
By the frequency suppose for ~. 4
ample that Il were desired ~ know 4
he wave iengfh n an electro magnetic :
wave having y frequency ~ Sise1 q
'ycies Els,fro-maKnetic wives travel 9.
n the same .i,eed 81 d. iixhf waves r.
hat O.. 5000 miles PER -eftmd ID a
.iding the ~ fsU bs Si1vD ne Nare d
eugfh would be- 223 miles or rsB I,
ards IN radin uurk h q measured
D meters a meter IL equal % ap- a.
.roxlmsfeif ~ yards Converting so In
ards into meters the waye length r.
rould b. n8 divided ~ M Or 80 &,
lefers. This j. the wave length on 70
.hirl kDkA operates II ais0 means In
bat the electr,, ma gnefic wsyes sen Al
ui from this station have n frequency -
Z $4,000 cycles Ne
FUNDAMENTAL PRINCIPLES
IN rndiophene fransniifer there
- two requirements fhat must b.
iifiIee First there mnsf be- source Ia,
hiEis-f requpnrt current. Say between III,
ipyi and f-fslfso cycles 20 fsiu -,
-cfed 10 an antenna and ground sys ia
% fhaf energy in the form ~ electro lat
agnefic waves will b. radiafed Sec so
"a there must b. some method ~ the
nfr"liinx fhls high frequency eurren; a I
moduiafing Il ~ fhsf the variations ne,
the amplitude ~ -. hlgh-frequency cel
trent will be- directly proportional zen