San Antonio light. [volume] (San Antonio, Tex.) 1911-1993, 1926-01-24
Lights Radio Expert Gives
Detailed Instruction for
! Benefit Of Beginners.
By D. M. STATIC

III Last week The Light described
Briefly some Of the features Of the new
4 kegenerative, neutralized, radio fire.
Inusney radio receiver which il has
khristcned the @Regenodyne," and
printed the schematic drawing Of the
jet for the benefit Of radio fans who
bike to construct their own receivers.
1t is the purpose of the present
Article to give more detailed instruc-
sions for those who are not so sccus-
eomed to following out the diagrams
commonly used in radio work.
Accompanying this article Is the
Diagram of the Dashboard layout of in
Btruments, arranged 50 that all wiring
will be as short as possible, with as
little interference between the various
circuits as can be arranged for.
+ ABOUT THE PANEL.
[ The panel, is inches long and seven
inches wide, is arranged systematic
ally, with two COOS variable conden-
sers mounted "a inches from either
md, and two and one-haf inches from
che top Of the panel.
Two rheostats are mounted on line
n "a inches from the bottom Of the
. panel, 6 Is inches from each end Of
! 5the panel. The variable resistance
with which regeneration is controlled
Sc mounted in the center Of the panel
between the condenser dials, and 3-S
inches from the top edge. A jack at
the right and filament switch at the
left are mounted beneath the base
Board.
The dashboard is attached TO the
panel "a inches up from the bot
tofn, on the same line as the rheostats.
The wood Of the Dashboard is cut
away in the center to allow for them,
however, and for clearance Of the
tvsrisble condensers, as shown in the
fHiagram.
\ MOUNTING COILS.
K Mount the antenna coil and tuned
''impedance (detector) coil, described in
last Sundays Light at opposite ends
of the Dashboard, as shown In the dia-
gram. This will separate them by
more than 10 inches, and will prevent
, any possibility Of undesirable feed
back.
1 The binding post strip, which is
. NEARLY as long as the Dashboard, is
mounted along the rear edge, acting
as a support for the radio set.
Begin the wiring of the set with the
filament circuit. First, connect to-
gether all the positive terminals on the
tube sockets, and connect this lead 10
one side of the filament switch. The
o. - .x..s~n1 q al. 1...ss,h L.
nected directly TO the A plus post of
the strip. In wiring most Of the A,
b and G battery leads may be placed
underneath the Dashboard and out OF
sight. Bore small holes in the base
board when necessary 70 get lead ont
of the way.
The wires carrying radio and audio
Frequency current. however, should BE-
>sred in the air above the Dashboard
- sar away from other sires and
from the instruments as is possible
without unduly lengtheniue them.
Tile a minus connects 10 ground d.
rect: 20 one terminal OF each Of the
shecstnts. and 10 one end Of the fila
ment cartridges mounted at the rear
If the DASHBOARD.
Now connect the other terminal Of
thr first rheoStst 70 the minus ter
ninal of the radio frequency socket /;
connect the other rheOstat In the same
way b. the detector tube socket; con
acct the filament cartridges similarly
% the audio frequency tubes which
,hey are beside.
TUBES SHOULD LIGHT.
The filament circuit now is com
piete and the tubes should light when
the A battery is connected to the
proper binding posts, the switch snap
ped on and the rheOstats turned.
Connect ground TO one end OF the
antenna coil primary. Connect aerial
90 the other. That completes the an
tenna circuit Now connect one end
Of the antenna coil secondary 10 the
stntor plates Of the first variable con
deu6rr and 20 the grid ~ the radio