Belt Valley times. [volume] (Armington, Mont.) 1894-1977, 1925-12-17

/ essary to remove the fixed condenser
/ (C) mentioned In connection with
Fig. /, since this would bypass
r.. F. energy needed for regeneration.
The result is an improvement In both
volume and tonal qualities. apart
from the gain by using regeneration.
The ticker coil itself consists OF from
10 to 80 turns Of wire OF most any
convenient size. preferably small.
wound on a short piece Of tubing
slightly smaller than the tuned R. F.
coll.
Care must be taken that In insert
ing the ticker It's wire cannot come
into contact with any OF the binding
posts, soldering Tugs or wire already
on the coll. and. moreover, II Is to be
situated at the flament end OF the
coil (N).
This can readily be determined by
noting which end OF the coil is con-
nected to the unmovabie plates Of the
variable condenser and also to the grid
condenser. shown between the coil tfJ1
and the (G) post on the socket.
II the ticker (T) Is wound In the
same direction as IND the ends Of IT'D
will be connected as Indicated. In
case of doubt TT can be inserted
one way and, II no regeneration re-
suits. It can be taken out. turned
around and inserted the other way.
The variable condenser (C) is prefer
ably an instrument already mounted
and located outside the set.
Later on. If you like the results,
you may install this extra condenser
on the panel, with an external knob or
dial. The size OF the condenser (C)
is not Of especial Importance. since.
II It is too small, more turns can be
used on coll (T) and, II too large.
some taken of.
The regular 23-plate condenser is
One OF It's terminals is con-
neeted to the ticker (T), while the
other goes to one Of the "A battery |
binding posts or to any convenient
point on the fiIament circuit. The
wire used should be Insulated to avoid /
contacts and the connec-
tons ought not to be too lengthy.
Operation.
Making the detector regenerative in
this way permits you to employ the
whistle to tune for DIX stations The
set must be carefully neutralized to
prevent radiation. but even then It is
better not to allow the detector to os-
cillate when you are on the wave
ength Of any local station simply be-
'ause there Is q chance that you
night interfere with some one
When the whistle" has been heard
md the r. F. dials accurately set. the
of condenser (C) Is reduced
Until the whistle ceases. A slight
ouch Of the tuning condenser for coli
M, the detector coil VIII bring in
Toice or music On long wave lengths
{ will be found necessary to increase
he capacity of tG1.
And on short wave lengths Il may
e necessary to set (C) at zero.
Where the natural period Of the an
emma interferes with reception around
20 meters, as It so often does. the
sgeneration control win onset this
rouble.
Where Il Is never necessary to use
aore than a quarter or a third of the
apacity OF (Cl TO produce regenera-
lon the ticker should either have
ever turns or should be moved par
Ially out OF coil (Nl. In case re-
eneration cannot be obtained on the
Ugh wave lengths 1t follows that the
Ickler should have more turns.
On account Of the two stages OF
uned radlo-freQuency In such 3 set
he added 'sfeedbackn for making the
etectOr oscillate viii be very slight I
nd much less than the amount OF re- !
sneratlve action required where there 4
only one stage OF tuned radio-fre- Z
uency. The difference in sensitive I
ess on waves formerly sort of dead" s
truly astonishing Ii