The Washington herald., 1922-10-08
Questions and Answers
Calls for Honeycombed Set.

Quest on-I should like very
much to obtain information as to
the use of honeycomb coils in con-
nection with an electron tube de-
tector set. should like the in
formation to contain the number
of turns required in the primary.
secondary and tickler coils to give
range of 200 to 800 meters. Also
whether wv 200 tube can be used
in this circuit? II not, what type
OF tube must be used and the volt
age required on both the "A" and
''B' batteries?-E. J. L.
Answer-The size OF the coils
used on the primary will depend a
great deal upon the length of the
aerial that you use. but / would
suggest a so turn coil each in the
primary and the secondary. and a
IS turn coil in the tickler. You can
use a wv 200 tube in this circuit:
and IL you do so, you will need a
volt storage battery for the fla
ment and a 22ls volt "B" battery
for the plate. l would suggest the
-use of a .00O5 variable air condenser
in series with the primary col. and
another condenser for the same
capacity across the secondary coil.
This condenser is the conventional
% plate type. You will have to
make quite sure that the coils are
connected up correctly in their re-
lation to each other and IL may be
necessary to reverse the leads on
the tickler to make sure OF this.
Tuned Il. r. AmpIihca ton.
Question:. Would you advise
the purchase of a tuned transform
er circuit? What does this tuned
circuit mean? Does II mean that
the r. +. transformers are tuned
to the broadcasting 360-meter wave
SO that nothing above that can be
tuned in? 2. Is the transformer
coupled r. F. more eficient and
easier to tune y. J. Med.
Answer The radio-frequency
transformers do not operate in the
same way that audio frequency
transformers function. The latter
not only transform the output OF
one tube to the input OF the other,
but they also amplify at the same
time in ratios anywhere from 81
to Ill Radio-frequency transform
ers. however, merely transform the
output OF one tube to the input OF
the other, relying on the amplify
ing characteristics of the tube il
self to build up the strength of the
received signal. Most of these
transformers are of a fixed value.
arranged to cover a certain wave
length band. A tuned transformer
is generally an arrangement to en-
able you to put your radio-frequency
amplifying circuits into closer reso-
nance with the incom ng wave and.
of course. adds more adjustments
to your circuit.
EIectroIytic Detector and AmpIiner,
Question-Would not an electro
lytic detectOr give less noise in the
receivers than a tube when using
both radio and sudio amplificaticn ?
p. W. NJ.
Answer have never had any
experience with an electrolytic de =
tectOr hook-up in conjunction with
you advice on that question at the
present time.
How Long Can Phones be Used.
Question: have a pair of Bran les
phones with my Aeriola Senior AMI
/ should like to know if using the
set for four or five hours continu-
ously would damage the set or tie
phones? IL there is any maximum
time limit on using the phones,
please inform me.-A. +. S. jr.
Answer-There p no time limit on
the continuous use Of telephones.
In fact. some operators have them
in operation twenty-four hours of
the day without any bad effects.
The same is true OF the set