The Washington times., 1923-03-04
FL|VVER RADIO
! CIRCUIT WINS
QUICK SUCCESS
Experimenter Gets Super-Re-
generative Effect Without
Using Large Inductances
CALLED SIMPLEST DEVICE
Small Set Carried in 'FIivver"
and Hears Stations as
Car Makes Ordinary Speed

WAKEFIELD, Mass, Mar. A.
What is claimed to be the simplest
circuit yet for obtaining super-re-
generation has been invented by
Edmund T. Flewelling, of Harris
Hill Park. Wakefield, an electrical
engineer. Dozens of tests Of this
new circuit have been made by Mr..
Flewelling, some of them in the
laboratory of DR.. Greenleaf w. Pick
ard, and none of them has yet failed
to do what was desired.
Many letters have been received
by Mr.. F'lewelling from those who
have tried out his circuit and from
radio engineers, who declare that it
Is not modification of the Arm
strong super-regenerative circuit
that he has obtained, but an entirely
new form Of hook-up. As to whether
this is so remains to be proven
through the United States Patent
Office, for Mr. F1ewelling has filed
q caveat, preparatory to applying for
q patent. The matter is now up to
the radio experts Of the United States
Patent Office.
SECURES SUPER-EFFECT.
Authorities on the subject express
the opinion that. anyway, Mr.. Fle-
welling's method is the simplest pos
sible arrangement for obtaining SUI
per-regenerative results with one
tube
mr.. Ls1axx,oI1;y,<~ .,s~c,,;& I5ors, o,r,r =,
with all large inductances, such as
are found with the Armstrong cir
cults, fixed capacities being used in
stead, which are not at all critical
as to values. Where an inductance
Is required in the plate circuit, the
1nductance of the telephone receivers
has been made use of.
ADJUSTMENTS TUNE CIRCUIT.
Only two adjustments are required
IN the circuit. The first is the tun-
ing OF the grid circuit through a
small variable capacity, and second
an electromagnetic feed-back to the
grid circuit from the plate circuit.
which he gets by the coupling to-
gether Of the two circuits with a
vario-coupler or other similar means,
such as honey-comb coil mounting.
apparatus called for by the regenera-
tive receiver. three small-siZed con-
densers and a resistance unit Only
one tube is used. This handles the
various functions necessary for SUI
per-regeneration. Signals and broad
casts are brought in better than with
Q two-tube set. For the local broad
casts and listening in, the set Is used
entirely without loop, aerial, or even
electric light socket connection.
Merely grounding on a radiator in
sufficient. The sounds are entirely
too loud with this circuit If loop or
aerial are used. However. for long
distance listening they can be used,
but have to be- graduated down, as
the reception Is very strong for a
considerable distance.
HAS SET IN AUTOMOBILES.
Mr.. Flewelling carries a email set
around with him I'm his "flivver''
and gets the Shepherd Stores and
Amrad stations easily while running
his car at an ordinary speed and
with the headset on. He can even
hear with the headset off, although
the sound is clearer and mellower
with it on, because of the outside
noises and the wind striking the
ears. he mas anoInef set on ms
desk in his office at the Edison
Electric Illuminating Company. He
frequently uses his office set at night
when not busy with his work.
He has been besieged by amateurs
to sell them circuits already made
up. but until he knows where he
stands on the patent question the
matter Of commercial production is
unsettled. He is, however, protect
ed by means of his caveat until the
Patent Office decides on the matter.
DIAGRAM AND STATEMENT.
By permission of Mr.. Flewelling a
diagram is given herewith, together
with statement from the inventor.
He says:
"I have been able finally to settle
the question as to how the low fire.
quently oscillations, on which oper
alton of the super-regeneration de,
ponds, can be secured without using
large coils or inductance, which are
Objectionable in many ways, being
both bulky and expensive.
LAS long as one handles the oscil
lations properly, it doesn't matter sc
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