New-York tribune., 1922-06-11

tween the general pubic snc the gen
cfal body Of amateurs.
The future possibilities OF the nev
T system are limitless. One Of the most
/ important Of them Is bound up IN The
ability Of the apparatus 10 operate eco
nomically and efficiently upon shor'
waves. Il will be possible in the near
future 20 utilize the receiver with th'
system now being developed OF shor'
wave wireless telephony, using a re-
fected wave which will give the utmost
degree Of secrecy attsinable.
Armstrong Very Modest
Although Armstrong has steadfastly
refused 20 talk about any OF the re-
markablo inventions, he did say 20 me
yesterday during a conversation that
he had succeeded in getting down "a
hfty-meter wave-lengths with the new
system. and that this experiment had
confirmed the fact that the apparatus
amplifed four times greater on the
short waves.
on waves Of this length, using re-
feetors shooting q beam Of waves IN
one direction, wireless telephone con-
versation has already been accom-
plished by Franklin IN Europe over a
distance of 200 miles with the older
types Of receivers With Armstrong;
latest receiver this distance could be
greatly increased with the same amount
o. transmitting power.
Despite the fact that Armstrong, who
BE- naturally modest. ~ retieent about
the value OF his inventions, his friends
have 70 hesitation about pointing out
their value. In this connection Louis
G. Paceni. a member Of the Institute
and ore Of the co-workers, IN discuss
ing it with nc. said:
when we take into consideration
tho fact that the super-regenerative
system is 100000 times more sensi-
tive than the regenerative circuit, II
is well 20 point out that the regenera-
tive circuit itself is several hundred
thousand times better than the ordi-
nary circuit.
Extreme Ampllfeation Obtained
ITO make this point clear 20 the lay
man. u should be pointed out that
with the regenerative circuit using a
dctcctor and two-stage smpliher. with
careful adjustment with the zero beat,
so that you get signal which you
can barely hear in the telephone. II
YOU switch over 10 super-regener-
tive circuit using practically the
same equipment and the same number
Of vacuum tubes, the same signals can
be heard in a loud speaker over the
entire room. This gives an idea OF
the extreme amplihcation.
Another important point rs the fact
that with multi-stage radio fre-
e ~ n
change wave-leng;hs, but by using the
supcr-regenerativc method the wave
length range can be very easily
changed. Such a change does not
REQUIRE more than two adjustments.
one in the secondary circuit, and the
other on the feed back or regenera-
tion.
with fixed induetsnces g wave
length range from $50 70 800 meters
can be covered without difficulty or
changing the inductances or capacities.
ln other words. you get a wave-lcngth
ratio Of four 10 one; say, starting at
900 meters you would get 400 meters,
and starting al 25 you would get 100
meters Ofcoursc. II the inductsnces
are made adjustable the difference in
tlc wavo-length range can be greatly
increased.
Opens Up a New Field
"lt seems that Armstrong. in addi
zion 20 giving the radio world an in
vention which is capable Of reception
on short wave-lengths in a tremcn-
dously efficient manner heretofore un-
known. has opened Up new field,
using extreme frequencies and ampli-
fying them without difficulty.
Practically speaking. using the
Armstrong supcr-regcncrative circuit
10 IS possible 10 use only two vacuum
tubes and a small loop about one meter
In diameter and hear any Of the broad
casting stations like WIZ with tele-
phones lying on the table at a distance
~ forty 20 fifty miles from the sta
tion With the addition Of another
vacuum tube as an ampliher IL is pos
sihe with the same equipment 10 hear
the same station az the same distance
ever an entire room by means of
loud speaker. Irrespective % whether
or not the loop is in a steel building
"lts possibilities on short waves are
also very important With three tubes
10 does the work Of the super-hetero-
dvne receiver which used nine vacuum
tubes, but II goes lower in the wave
length scale than the supeT-hetero-
dyne Its importance can be further
emphasized when IL is pointed out that
40 the present time there are no wave
lengths between zero and so meters in
use. and. as matter Of fact, very
little below $50 meters"