New-York tribune., 1922-06-18
Expert Describes Best Way
OfTuningV VariousReceiyers

tuning coil can be adjusted. This col
is called the ticker coil. or the irtcn-
si;y coil. or the regeneration coil. Con-
slider single circuit receiver using
vacuum tube and regeneration. We
have three controls. the whyc-lcngth
tuning, the regcnerativc coil and the
iilament rheOstat. Tne proper method
OF procedure m operation 's as follows.
Set the flamcnt 90 as near proper
brilliancy as II is possible 10 estimate.
the ticker coil being set 40 zero during
this adjustment.
Tho next step IS 20 vary tho wave
length control over It's range very
slowly, listening carefully for the de-
sired signals. When they arc heard
adjust The wave-lcncih control and the
flamcnt control 10 best results. and
then increase the rcgcncratiyc or
tickler control until signals arc best,
possibly slightly rcadjusting tho wave
length control. which may be affected
by the change OF the tickler. n the
ticker IS increased too far telephone
signals will be spoiled. speech and
music sounding mushy instead Of be-
ing clear.
Don't Let Tube OsciIlate
Always take pains not 10 increase the
tickler too far. because when this is
done the vacuum tube oscillaics or be-
comes a small generator OF high fire.
qucncv current. and this current goes
out on the aerial and causes waves just
like a sending stations. only not as
powerful. and other receiving stations
within a distance Of one or two miles
can hear il and will te interfcred with
by IL. Whenever you hear on your set
some whistl.ng sound which come and
90. varying In pitch. ~nu may know
that some receiving stations near you
arc radiatlng in this way because their
ticklers are turned UP too far.
The single circuit receiver. with its
few controls. is quite simple 10 operate.
and n little experience enables one 20
get results easily. This type Of re-
ceiver is sensitive. but Is not as selee-
tive as the two-circuit type-;hat is. u
is more likely 20 let through undesired
signals. thereby interfering with the
desired signals. on the other hand.
the two-circuit rcccirer. especially II
provided with regeneration. is much
more difficult 20 adjust. The major
controls on two-ciTcuit receiver are
the lerial circuit called primary
tuning, the secondary circuit tuning,
the coupling between these two, the
ticker and the tube flament rhcostai.
In short. there are FIVE controls 20 ad-
just.
The most important and most criii-
cal one OF these b. the secondary tun-
ing. To pick up signals. set the
coupling az or near maximum. the de-
tector flament brilliancy properly. the
primary tuning control and the ticker
az or near their lowest value. Then
very slowly vary the secondary wave
length control from zero 20 maximum.
II signals are not heard. change the
primary setting or 10 degrees and
vary the secondary through It's range
again. This should be continued until
signals are heard II they are not
heard. increase the ticker some and
repeat.
After a signal is once located adjust
all controls 70 best results. remember
ing that Il u Is desired 20 obtain free
dom from interference the Coupling
must be decreased toward zero consid-
erably. Do u in small steps. 50 as not
70 lose the signal at any time.