The Challis messenger. (Challis, Idaho) 1912-current, 1925-08-12


e on the circumference. wind ten turn
e for Ii and so turns for LIZ. The dl
n vision Of the two wlndlngs is denote,
8 by a tap. Both the ground and tn,
+ minus are connected to this tap
e This affords conductive coupling o.
e the aerial to the grid. For conduc
! tive coupling Ii Is wound separately
> and so is LIZ. The two other trans
formers L3L4 and L5L6 are wound
! with ten turns Of the same kind of
wire for the primary, and so turns Sec
ondary, tapped at the fifteenth turn for
the connection to the neutralizing con-
densers.
The single winding on the aerial coil
works very well, but little more Sc
lectivity Will be obtained by following
the diagram, with the two windings
| separate.
The coils are wound under two and
over two" When the winding is fin
ished the coll may be raised about
inch from the form and cord in
serted In wave form through the
inside length Of the winding and knot
ted for security, or the cord may be
employed In any other fashion for
support.
The coils are removed from the form
after this laclng is completed. L1L2
Is mounted on the Dashboard at least
2 inches in back of CT, the coils axes
parallel to the Dashboard (windings at
right angles to baseboard). For this |
purpose two dowel sticks may be used, |
relnserted at two adjacent holes In |
the winding, using two Pinch hard
rubber or brass right angles, secured
to the Dashboard and to the dowel
sticks. L5L6 Is mounted in the same
way. L3L4 Is mounted with its axis
perpendicular to the Dashboard, the
more conventional fashion. Thus adj
Joining coils are at right angles to each
'ther and magnetic interplay Is sue
,essfully avoided.
Place all the Instruments In their
respective places taking care that the
KIT are all near their own sockets,
10 as to have very short leads, and
hereby save some energy.
Tho Wiring Of the Set.
Bring the beginning of the wire of
j to the antenna post of the ter
linal strip and the end Of the coil
this being the ten-turn primary to
he ground. Connect the beginning of
ne secondary coil LIZ to the stationary p
lates of the condenser, CT, to the Il
rid post Of the socket, and to one Il
I'd or the neutralizing condenser, CT,
le end Of CT going to the fifteenth a
i'm tap on the coil, Ia. The beginning Ii
the coll, LIZ, goes to the plate post of pl
Re first tube socket, the end Of this =
III going to B plus post (671h volts) Ell
the strip The end Of LIZ goes to &C
e rotary plates Of the condenser b,
ID also to the negative side of the T.
battery, and to one end Of amperite. vC
you desire to obtain volume and a tn
less selectivity, connect the end ce
LII to LIZ. The beginning of LA to
es to the grid post of the second We
'e and also to the stationary plates Is
the condenser CO and also to one ne
OF the neutralizing condenser, CO
is Is the second one), the end of Is
going to the rotary plates Of CO and the
the end of the amperite which In
n goes to the A minus. The begin
6 OF L5 goes to the plate of the
ond tube and the end goes - the
ne place the end of L3 went to.
I Is the B plus 671a volts. Bring
end of the second neutralizing con-
ser to the fifteenth turn of 16, the
inning Of the coil goes to one post Of
and also to the stationary plates
CA. Bring the end of the coil to
rotary plates of CA and also to
post of the leak, and finally to the
lus and B-minus post of the ter /
al strip. The left-off terminal of
grid leak goes to the left-off ter
al OF the C5, which in turn goes
he grid post Of the detector socket &
third tube). Note that all the
critics are placed in the negative &
of the battery and the detec-
rheostat Is placed in the negative
to same, the only difference here 4
that the grid return is put to &,
positive side Of the low potential
instead of the negative as was
with all the grid returns of the Il
: tubes. rs
e G battery is inserted In the
Of the AFT, which 60 to the 81
$ side of the @ battery, the pos h
side of the @ battery going to Isl
switch. eventually to negative A 81
ry. =
set Is designed for earphone use RI
to facilitate tuning, otherwise al
for speaker use. If earphone
. on regular reception Is desired.
another switch between the
mt side Of 81 and the battery
II the audIo amperites.
How to NeutraIlxe the Set. q
is simple process Of
out, but 1t takes little time to
just right. Put z small piece of
between one Of the f1laments of
cond tube from left and the
on the socket. Push the fla
witch out and light the tubes, -
Inc In loud local station. II :
ar the least undertone of a sig. o,eu