New-York tribune. [volume] (New York [N.Y.]) 1866-1924, 1922-07-02
variable condensers shown as CT anc
C-3.
Loop Aerial Must Be Used

1t should be borne in mind that this
system must be used with loop aerial
| If an outdoor antenna is attached to 1T
the signals will be so strong that the
vacuum tubes will be paralyzed. An
other disadvantage in using an outdoor
antenna is the fact that the set will
radiate from the aerial and cause in
reference to nearby sets.
With this three tube super-regen-
erative system it is possible to operate
a loud speaker up to fifty miles from
any broadcasting station using a power
output equivalent to that of Newark.
under any and all conditions with a
loop aerial. The music will be clear
and free from all distortion provided
all the connections and adjustments
are properly made.
Club, after having been presented by
George z. Burghard, president of the
club, Major Armstrong said that the re
suits he had obtained with this system
during experiments were better than a
six vacuum tube super-heterodyne re
ceiver. They were equal to the latter
plus Western Electric power ampi-
fer--or the equivalent Of nine vacuum
tubes.
Set IL Demonstrated
The young radio wizard demonstrated
for the audience the working of his
system for the purposes of the recep-
ton of continuous wave telegraphy,
damped wireless telegraphy and radio
telephony. In the first demonstration
he used the super regenerative re-
ceiver without the third vacuum tube
A buzzer set specially rugged up to rep
resent continuous waves of a certain
strength was used for the demonstra-
al
clear on the loud speaker and filled the
room with their volume.
Before proceeding further, the loop
aerial was disconnected and then con-
nected to the regenerative receiver
with two stages of audio frequency
application. The resulting signals,
given under identically the same con-
ditions, could scarcely be heard
After this demonstration was
given with the system used for the
reception of ordinary spark signals.
The experiment utilized the sending of
the famous why, the commercial wire
less telegraph station on the Bush
Terminal in Brooklyn. In this test
Major Armstrong showed the manner
in which the characteristic tone of a
spark station could be changed at will
to any other tone by means of his
latest system.
Greatest Interest in Radiophone
1t was in the set used for the radio
, phone receiving demonstration that
the greatest interest was displayed by
the audience. The tests showed be-
You'd any question that it was the ideal
receiver for radiophone entertain
vantages: the complete elimination of
spark telegraph signals; the produc-
I ton of full volume with a minimum
number of expensive vacuum tubes,
and the fact that no outdoor antenna
is needed for it. There is further
advantage that is bound up with the
ability to eliminate spark signals, and
that is the fact that more than 80
? per cent of static interference is also
eliminated.
The unprecedented simplifying pow
ers Of the superregenerative system
were clearly and forcibly demonstrated
during these reception tests of wireless
telephone broadcasting. When the
loop aerial used with the super-gener-
ative receiver was switched over to the
regenerative and two stage audio am
plification set, there was absolutely no
response in the loud speaker.
In other words, the new system
using three vacuum tubes was able to
fill large room with solid volume Of
clear and distinct speech and music,
where the other set using the same
number Of tubes completely failed.
Amplifies More on Short Waves
Another remarkable fact concerning
!. the new system brought out by the in
ventor is that the lower the wave
length on which it is operating the
greater is the application. He ex-
planned in that reception on waves of
100 meters the amplifcation is four
times as great as on waves of 200
meters and SO on.
AS pointed out in the first descrip-
ton of the set printed exclu in
this department, this means that some
time in the near future broadcasting
stations will be able to operate on
waves as low as ten meters. The only
thing that has prohibited this hitherto
IS the lack Of receiver which would
respond economically and efficiently to
these low wave lengths.
Ihelmportance of this Is not appar-
ent from the above, but it will be bet
Ter understood when we explain it IN
ohe terms OF frequencies; namely, the
speed with which an electric current
changes from positive to negative. At
ten meters an electro magnetic wave
is alternating at the terrific frequency
or 50,oO0,O0O times per second. A wave
length OF eleven meters alternatcs at
the rate of 27,272,270 times per second.
Frequency Causes Interference
Therefore, in range of one meter
only In those low waves there is p
frequency difference of 1927 900 times
per second, ana as it is frequency
which causes interference in radio i
Will be quite possible for two broad
casting stations situated quite close to
each other to operate with difference
OF only a quarter of a meter between
them without causing any interference.
inns becomes more forcble when We
take into consideration waves in the
nelghorhood of 5000 meters. A wave
OF the latter length has frequency of
10000 cycles per second. A wave
OF 5000 meters has a frequency
OF 10000 cycles per second; therefore,
In those ranges q difference of 1000
meters means a frequency difference
of only 10000 cycles, as compared viii
the almost 100000 cycles which a diff
terence of one meter makes in the
ranges about ten meters.
This thing alone makes the super-re-
generative system revolutionary. he.
cause it opens UP those wave lengths to
US on an economic basis.
Paris to London Radiophon~
Rediophone service between De-.