New-York tribune., 1922-06-11

aAiNNNN AiNNNttNf"Atht
Az one stroke the new system opens
up the urexplored territory In wave
lengths below 100 meters. which in
volve electrical currents alternating at
the stupendous rate Of more than
1000. 1000 cycles a second.
Il sweeps away from radio broad
cast entertainment all need for out
side wires or aerials completely, and
with il music can be reproduced wit'
the volume Of a talking machine IN any
sized room without any outside connee-
tons whatsoever. irrespective Of the
amount Of steel in the framework Of
the building.
Eliminates Interference
u removes the present bugbear Of
ratio hy completely rejecting all inter
ference from wireless telegraph sig
nails caused by sparks and 20 also wipes
out more than fifty per cent o. the in
tcrference caused by static.
An idea OF the remarkable character
q the new apparatus may be gathered
from the fact that 10 amplifes speech
and music 100000 times greater than
does the next most sensitive apparatus
known the regenerative receiver. with
two stages o. application, which was
also the product OF Armstrong; genius.
Used for the reception OF continuous
wave telegraph signals the new APP
paratu7 has even greater amplitcation
possibilities. ranging In the order or
100000 times greater than the re-
Eencrative circuit This means that
with i's aid 10 will be possible for
receiving station In this country 20 re-
ceive from any part Of the world so
far as continuous wave teigraphy Is
concerned
There is not the slightest doubt
about tho new apparatus being the
most important development in the his
tory of radio communication. 10 rs the
third epoch-making achievement that
the young wizard Of Columbia Univcr-
sity has produced but it Ear surpasses
ir Importance the other two. which
were the rcccnerative receiver and the
super-hetor0dyno receiver. although
the latter enabled Paul Goi'cv O. re-
ceive signals more than 5000 miles
from twc1ty-scvcn American amafcurs,
each with an output cf less than enc
horsepower O. electrical energy.
Is kedl hdQlO Ampllner
Armstrong calls his latest system the
supcr-rcgcncratifvc receiver. but 10 is
IN an reality the first true radio frc-
ogcncy amplfer. It's most astounding
Characteristic is the fact that 10 in
crcascs its power OF amphfcation in-
versclv as the square of tho wave
length Put 20 simpler language this
means chat the lower tho wavc-length
the greater tho application; thus n
the vave-lonrth is cut in half tho in-
coming signal is ampifcd four times
stronger than 10 would be IN the first
cl,c.
Perhaps another more forceful way
of stating this is by saying that the
new receiver opens up 20 Us the lower
wave length ranges. so that in tho i'm
mediate future 10 viii be quite possible
f0r hroadcast.ng stations % operate
ou wavc-lCugths as low as ten meters.
Sow when we have broadca Is as low
ae that 10 will mean that the two
stations close together can Broadcast
simultaneously without interference.
or. using "a wave length OF ten meters
a.I the other a wave-length OF eleven
motors.
This i- because Of the fact that a.
fho.e waEe-iongths thcre is differ
cnre .r Frequency between fhe Two
stations of 27--.00o cycles q second
a. .t I. tr.nnNrrN which Causes lnf af-
ference. 10 vlll be seen how great
fls nnr..n Of difference in frequency
ON che .oW wave-lcngfhs whom o f.fer.
enre of one meter M warc-lcncth makes
difference Of 2r27.Onl alienation
q second in tho electrical current
system Is Very Simple
Tho wordrous possibilities ~ the
reu apparatus are obtained in tho
y mq'c.f manner imaginable. The ter
rfc rm1Ilacation can he obtained WITH
two ordinary vacuum tubes connected
together with inductances and con
derttrs. huf. ~ course. better results
are obtained with three tubes. as shown
in the diagrams reproduced on this
page.
In on actual demonstration % his
now apparatus before the Institute of
Radio Engineers. Armstrong complete
iv flooded the large auditorium with
music and speech from Newark, eight
cen miles away. although hc only used
a small loon about one mcatcr diameter.
This was done despite the fact that
che Engineering Societies Building is
a mass ~ steel framework thoroughly
grounded.
Aiorr.iao ~ his demonstrating ap-
rsrstus was "a standard reccnerative
receiver with two stages Of audio-fre-
ouencv amplifcafion. Whom this was
attached 90 the loop aerial no one IN
fhc room could hear tho music from
Newark. although 70 could be heard
family IN the head telephones.
Receiver Eliminates Sparks
Ono ~ the astounding Characters
ties whch makes the new receiver
tho ideal broadcast apparatus, IS rs
ability 90 completely eliminate spark
signals. 70 wipes them out absolutely.
Ir ov-iairinr :his. Armstrong pointed
out that the incoming spark sets up
f~ec oscillations ir ~ recererafive CIR
r.i. which CONTINUE 1rti tho next
spark comes along. and the greater
pare of tnc energy is IN these free
vibrations.
The program which had been set
aside FOR Wednesday az WIZ consisted
~ Literary night wherein authors
read selected chapters from their
works. Realizing that this would not
give a complete all-around cemonstra-
fion Of the remarkable possibilities Of
his new apparatus, Armstrong asked
FOR an amplifcation ~ the program.
Miss Eva Leoni. a well-known soprano
who had sung 20 the radio audience
two days previously. volunteered again
- so facilitated the reproduction OF
q vei..roundcd program.
In the new system these free vibra-
tions arc completely wiped out because
every twenty-thousandth Of second
the resistance Of the circuit becomes