New-York tribune. [volume] (New York [N.Y.]) 1866-1924, 1922-08-06
On Aerial Construction

Ouestion-1 How far apart should two
wire antenna be at the spreaders NINE II, s.1 IS
be connected to each other at both ends.
or only at the lead-in end?. 8. How are the
four windings Of a variometer joined ID
also the high oo-1lo volt "B" q, e. NJ
Answer.-1. AS a matter Of fact, the
best aerial for receiving purposes is a
single wire aerial. This brings in just
as much energy for telephone purposes
as two-wire aerial will, while the
latter picks up a little more energy
from telegraph stations, as we'll as
static, and consequently causes little
more interference in telephone work.
There is no rule, so far as know, as
to the distance that should be followed
anything under three feet would, l
think, be inefficient. 2. Joining the
wires together at both ends or only at
the lead-in Is also optional and makes
but very little difference 8. The vari-
ometer windings are connected as fol-
lows: One wire of the stator is ter
minal of the variometer. The end of
that particular winding is joined to the
middle wire of the remaining section
of the stator, and then the final wire
of the stator is connected to the begin
ming of the rotor. The two middle
wires of the rotor are Joined together
and the final wire of the rotor is the
other terminal of the instrument. 4.
l may say that a very well-known
radio inventor is now at work on the
development Of system which will
use the lighting circuits of the fila
ment and plates of vacuum tubes,
which will at the same time eliminate
g frp
the lighting circuit itself In my con-
versations with this particular inven
tor I understand that r very fair
measure of success has already been
attained and the results look very
promising.
Notes on Single Tube Super r.
Question:. In the single tube super-re-
generative receiver you show condenser
did you mean 1t ,0O05? 2. Same applies to
condenser No. II. 8. You state that con-
denser No. IS and 16 may be combinations
of fixed condensers and yet you state that
the capacities of these two condensers
must be very carefully determined. If this
is so. what Is the maximum amount of
could be made and still get a proper con-
troll of values7 4. How could you place
the following four variable condensers to
best the positions in the diagram
No. 4-16-13 and 8; two 40 plate, one 20
plate and one IL plate? 1t Is, of course,
understood that these would have to be
supplemented by fixed condensers to pro-
duce the proper total values The idea is
to best take care of the maximum vara-
tion likely TO be necessary In each of the
circuit use only so volts on the plate while
the 3-tube circuit carries 200 volts? G. Is
there any particular way OF connecting the
they placed that the convolutions of
wire are in the same direction when they
are in inductive relationship? In the dia-
gram which end of coil No. IS and which
end of coil Nc. IA represent the inside
terminals of the honeycomb coils? Z.
What goes on in the so-called alter
properly?-C. G. X.
Answer. Condenser No. 16 should
be zoos. 2. Condenser No. 10 should
be .0005. @ Condenser No. IL is
.0o5. Both of these are large sized
condensers. 8. The ombination of
condensers, in order to be varied by
steps, should be made up of five .000ls
in case of the .0005s and five .O01s in
case of the .005s. 4. Use your 43-plate
condenser for condenser No. a. 1t
should have capacity of 0O1 mid.
capacity in itself. The 23-plate con-
denser can be used for No. ID. 1t has
in itself sufficient maximum capacity,
or at least it should have Use the IL
PiaLe coAueHser IN conjunction with
the necessary fixed condensers for con-
denser No. Is. 5. Eighty volts should be
used on the plate of this tube-zjust
the same as 80 volts is the correct value
on the three-tube circuit for the two
tubes that are performing the same
function as this particular tube. In
the three-tube circuit the 200 volts are
placed on the plates of the simplifying
tube only. In the single tube circuit
it is absolutely imperative to have an
inductive relationship between the
two large duo-lateral coils. The cur
rent must flow in the same direction
through both of them. You can deter
mine this by changing the leads in the
event Of not obtaining any success.
When the tube operates as an oscil-
lator in this particular system it pro-
duces oscillating currents. which ara