The Bozeman courier. (Bozeman, Mont.) 1919-1954, 1925-01-28
Two Simple Rules
to Aid in Tuning
Methods Which VIII Pro-
duce Signals That Are
Clear and Louder.

0AkAG AAAC9 III kMA 1
-ng which II observed carefully will
surprisingly good results.
Not only will you hear more stations
stations you never heard before
but those you usually hear will come
in clearer and louder.
In the first place the object In tun-
lng is to get the circuit tor ~clrcuits)
of your set in resonance at some fire.
quency Tor length). When y0H
have done this. a signal should be
heard Il a station is brOadcasting on !
that wave length. If one IL not. then
you should hear faint artificial or at
mOspherlc noises. When searching for
stations, try TO maintain this cOndi-
ton OF resonance while yeu shift your
tuning controls throughout the range
Of your set. This Is Tuning Rule i.
Signals from distant stations are
usually so weak at FIRST that they are
dinicult to distinguish from the ever
present resonance noises As n re-
suit a great many distant stations are
passed by undecided. II you want
to hear these stations, It is Of para
mount importance, says Tuning Rule
2, that resonance positions in tune
with the wave length Of q distant sta
ton be approached very slowly and
carefully. .
Attachments Hsins Discarded.
When varlOmeteFs, eOuplers, con-
densers, pOtentiOmeters, or other
tuning instruments are controlled
merely by an ordinary knob or dial,
It is practically impossible to do this.
In trying to obtain proper tuning con-
troll, radio engineers first replaced the
original small knob with large dials
because Of the greater mechanical ad-
vantage derived. To increase this ad-
vantage a small knob with q rubber
disk was then placed tangent to the
edge Of the dial. Imperfect contact
producing uncertain control is causing
these attachments to be discarded.
The next step toward improved
tuning control was the addition Of
vernier plates to c~Ondensers. The
limited range Of the vernier plates,
however, practically forces you to tune
with the coarse adjustment. With the
latter it is almost impossible to fulfill
the conditions Of Tuning Rule 2. AS
a result many distant, stations are
missed.
Contact losses and the inconvenient
twO-knOb arrangement have further
proven vernier cOndensers ~unsatisfac
tory. Besides, the ~sO-called verniel
attachment is invariably controlled by
a very small knob. Because of fl
small size such a knob almost total!
cOunteracts the ratio intended by tn,
vernier.
.;e Solution Is Offered.
With these problems In mind, Their
has recently been designed a tunin
dial which offers a practical solution
By means of a simple geared mechar
Ism contained within the knob tn
/ conditions demanded by Tuning Rule
) 1 and ? (see abOve) are easily SAITH
fed. Such a dial has these additions
advantages:
1t may be attached readily to an
tuning unit, such as variOmeters, CO..
densers, ETC., by simply substitutin
it for the ordinary dial. Its sing
knob gives continuous vernier I
g rapid control throughout the entil
1 range Of the unit and eliminates Il
inconvenience Of the usual double q
rangement. There are no cOnta
losses through additional vernier g
tachments. Besides. a standard knC
, such as this improves the appearan,
o of a receiving set by emitting u
slightly additional knobs which a
h generally scattered unsymmetrical
about the panel.
If you are building a set, or wi
to improve your present one, you w
find it both economical and highly a
v~antageOus to buy good plain instr
l. ments and equip them with a SING
S, knob vernier dial such as that 4
scribed above. With such tuning CO
TO trolls 1t will be easy TO keep your $
v in resonance and approach resOnan
positions in tune with certain static
slowly and carefully. Distant q
local stations VIII then be tuned
~ with almost equal ease.