Richmond times-dispatch. [volume] (Richmond, Va.) 1914-current, 1922-04-30

hcient results. he must applv the
rudlments OF scientific operation To
his tuning. This simply means that
ne must exercise almost a. much care
IN bringing In the big broadcasting
signals as he does to run his car.
This does not always apply. how
ever. for. in the case Of the radio
erola. Tor fnstance enc has merely
TO push button, rotate dial and
listen. But. as this outfit is quite
Now and difficult TO obtain. and as
the price il we'll outside Of tho aver
age pocketbook the ordinary radio
ran is not concerned.
Four Fundamentals.
There are four fundamental things
to be done on the average receiv-
ing set. !. G.. the apparatus itself,
exclusive OF antcnna, batteries; etc.
First, coupling between the primary
ana secondary circuits; second. re-
generation: third. tuning (antenna
circuit and secondary circuiu. and.
fourth iilament rhcustats adjusted to
proper current values
In one of the most popular sets
on the market. the single circuit.
capacity fecd-back tuner. the first and
third major operations are combined
IN single operation. made by means
OF single. large dial and knob
marked tuner" This controls both
49, N"p"Si'y anu lnuuClanCG or the
primary md secondary circuits
y number OF the elementary and
Inexpensive sets are designed with
out secondary circuit. eliminating
not only Il deal OF trouble, but also
deal Of efficiency and usefulness
by way of selectivity.
Before attempting to tune a set.
the operator should assure himself
that the antenna switch Is placed cor
rectiy. the iilament tubes are lit and
! the rhcostat is turned up until
slight Kissing sound is heard and the
dial rotated to the slightest frac-
ton of an inch below this kissing
point, and that his phones and bat
/ teries are in operation.
Move the ''rirkIcr" Dial.
Then the "tickler" dial is moved
back to minimum. or few points
above. AS this regulates the re-
generation and, In the case OF the
single circuit tuner. needs very crit
zeal adjustment. the best values of
initial reception are found by ex-
pcrience. However. they should not
be too high.
The tuner dial is next brought into
| movement until the desired signal is
brought in as loud as possible. max
ing certain that the rheostat Is lust
below the Kissing point Then turn
with one-until maximum strength is
obtained. In the case OF separate
primary and secondary tuning, both
inductances should be tuned individ-
ually. beginning with the former. set
roughly at onc-third or one-half
maXimum--if the signal desired is
not known In terms OF wave length
and the secondary circuit adjusted
| until the signal is heard. Then re-
tune the primary 10 maximum signal
strength and the secondary In n Xix
manner. In the initial step. the cou-
ping between the two should he
! maximum: later adjust to maximum
signal strength
The next operation is tho movement
or the regeneration knob towards
maximum until the loudest signals
are obtained. LoudeSt signals should
ne sacrificed to pure tonai values and
maximum nudibility. Too much re-
generation destroys this. l"ilament
Driiliancy should be the least possi-
Die consistent with desired signal
strength. y dull red flament causes
! crystali1ation: white hot filament
causes too rapid vanorization; both
are uisastcrous to the life OF the
tube. y happy medium is the sine
qua non. With these simple rules
Il novice may expect to obtain the
pest possible results. regardless OF
the coInplcNity of the set.