New-York tribune., 1922-09-03
First Aid for the Radio Fan
Marking Up Wave Length ON Tuner;
Type of Aerial for Transmission;
Testing Short Circuited Condenser

then follow ten taps OK ten turns each.
snen sn ono tap Of rs turns. then one tap Of
~ turns making Il total Of ISg turns.
lhe rotor Ia u inches in diameter and is
wound with 2S turns each winding of No.
- . copper wire. The vaTioneters
are inches outside diameter " inches
inside diameter atator tubes each, The
fotors are 3A inches outside diameter
each The varloTneter stators and rotors
ing with No. - ID G copper wire. Will
you kindly advise IL you think the yario-
coupler - wound alright as to turns and
taps.---W G. II,
Answer-Your apparatus is made all
right with the exception of the vario-
coupler. On the primary of this in
strument you have far too many turns
for the ordinary 360-meter stations.
However, if you desire to leave the
full 189 turns on it, it will be per-
fectly all right and should bring in
WVP on the 1850 meters. The secon-
Diary OF the vario-couplcr do not quite
understand, but if you have only
twenty-five turns altogether on it, !
would say that is not sufficient and
would suggest about fifty turns.
Tuning Variometer Set
Queston--will you kindly advise me
what TO do with my varioneter set J
cannot get any signals but a lot Of
screening and bowling. also vibrating
noises, when the instrument is tuned In
certain degree Now II / take the in
diyidual parts and hook up with my
"B7 battery and can tune out with the
rheostat. having tuned out to the highest
and lowest pitch of "howling' My serial
is a single wire 90 feet long. 65 feet high
near but none touching; also my aerial
is pointing nearly due east. favoring the
horth.--J. T. ~
Answer-The only change that | can
suggest in the diagram that you have
included in your letter is that of plac-
ing the rheostat in the positive side of
the "a" battery, and joining the two
battery together to the return lead
from the secondary Of the vario-
coupler In order to make this change
all that is necessary is to simply
change the connections of your storage
battery around, leaving the set wired
as it is at the present time. II you
have got the set wired up exactly in
accordance with the diagram, with this
one exception, there Is no reason why
you should not get excellent results
with it, Are you sure that you have
got the positive terminal of the "B''
battery Joined to the telephones? You
will find that the operation of this set
is extremely critical, particularly the
grid variometer and the secondary of
the vario-coupler. The slightest turn
of fraction of an inch will complete
ly throw out a station--consequently
it is necessary 10 tune very, very
closely, as you may go right over the
point where the music will be coming
in without actually knowing it, if you
turn these two instruments too rapidly
The plate variometer should be care
fully adjusted after the signals are
heard. IF you get bowling, screeching
or other noises, reduce the amount OF
coupling in the plate variometer. il
the signals are weak increase the
amount of coupling in the plate vario'
meter. / think that q little attention
to the tuning Of this apparatus will
greatly improve the results, but
would suggest that you go very care
fully over the connections. in order
that you may be sure YOU have them
correct. OF course, it is also neces-
sary to have the primary csfeult, con-
sisting of the primary of the yarlo-
coupler and 43 plate condenser, Sare..
fully adjusted to the wave length OF
the station YOU desire TO listen to.