The Washington times., 1923-04-15
FLENELL|NG SET
USES SINGLE TUBE
Proves Successful in Use, Re-
producing Loudly on Long
Distances.
HAS NO AERIAL OR GROUND
Chicago Fan Receives From
WGY, WHB and WGM
Distinctly.

This is the seventh and last in
OtalIment describing the Flewelling
One-tube circuit radio receiving set
that has proved one Of the most
successful in use. The earlier artl-
cles and illustrations have appear
ed in previous issues OF the SUNDAY
Times-H Herald.
For the benefit of the many read
Nrs who have missed the previous
articles of this series, the hook-up
is again repeated, with some slight
improvements and comments. The
values of all the pieces OF appar-
atus are given in the illustration
go that the drawing Is completely
self explanatory.
II has been found from exper-
fence that but very loose coupling
Is necessary. For this reason the
use of tl1ree-coil mounting is sug-
gested, leaving the center mount
empty. This will permit looser
coupling, as it allows the angle be-
tween the coils to he Increased.
some of the diagrams show the
phones between the "A and B bat
feries. while others show the phones
between the B battery and the plate
coil. This is immaterial, as both
methods will operate successfully.
A Chicago fan reports that his
Flewelling set will receive WGY,
WIG and WGM as loud as local
broadcasting plants heard on a
single tube regeneratlve set. FIe
uses VT-2 or "E'' tube with 100
volts on the plate, but NEITHER
AERIAL NOR, GROUND.
In order to reduce body capacity
effects to minimum the maker
is cautioned to connect the variable
condenser as directed in the dia-
gram.
Copyright. 1922. Radio Digest
Pub. Co. Chicago).
CONDENSER BANK.
In making super-regenerative
ret using the Flewelling circuit de-
scribed in this series of articles, the
amateur may be undecided as to
Just what condensers to use, and
how to arrange them, Tor there
are three .006 mid. condensers,
which appear in the illustration as
C3. ca and C5, and also the grid
leak RI, which is shunted across
the condenser C5. The condenser
bank is made up as shown.
The materials needed are as fol-
lows: "A small piece Of insulating
material approximately AZ by 81
inches, which in my case was cut
from an old storage battery cell.
Seventeen tested fixed condensers1
of .OO1 MID. capacity each and ,1ne
combination leak condenser iar Of
which may be bought cheaply) three
binding posts and six brass bolts
III inches long and of size l2-32
should dol to pass through the holes
In the fixed condensers.
PERFORMANCE OF SET.
It may interest you to know that
/ built a F'lewelling super-regener-
alive circuit as given in RADIO
DIGEST and / have been getting
some remarkable results. am
using the set without any real
antenna. For receiving purposes !
attach z wire to the heating
system of the house or simply drop
fifteen or twenty feet Of ordinary
annunciator wire out of the window
and not touching the ground. In
either of these methods of receiv-
ing I-have been able to receive up
to distance of one thousand miles.
1t remains to be seen what / can
do with real antenna.
Now comes the strangest thing
VI dlls w III lIllS SGT dHO WtIHDuL
any receiving wire of any kind ]
can pick up stations as far away
as Pittsburgh and bring the voices
and music loud and clear I can
pick up Pittsburgh in this manner
almost at will. have demon.
strated this fact to several people
who have been skeptical and / have
done 1t with the set inside of a
brick building in the heart of
Asheville, N. c., among all of the
trolley and lighting wires. If you
can devote the space in your paper
] wish you would give the theory
of the reception in this instance.
The set itself is picking up the
signals and regenerating them Of
course, but just what part of it is
probably doing 1t?
A good many Of the Radiophans
here are interested in this and so
far as I know I am the only person