The Washington herald., 1922-04-15
Questions and Answers
Antenna-Lead.


o. l understand that where one
end of the antenna wire Is higher
than the other the lead-in wire
should lead from the shorter end.
also that the lead-in wire should
lead as direct as possible to the
switch. Please examine
the enclosed sketch and tell. me
what method of wiring should use?
F.. ]. s.
A. You are correct in your first
statement. therefore in your dia-
gram take your lead-,n from the
lower end of aerial.
Crystal Detector set-up.
Q. What stations would be able
to hear on a set containing one
variocouple.. one variable con-
denser, crystal detector. one fixed
condenser. one pair of 5000 ohm
phones? Three wire antenna 32
feet high. 100 feet long? c. X. c.
A. Local stations only, probably.
1t would be much better for you to
send in a diagram of your wiring.
Noises In Receiver.
Q. I have a set consisting of two
yeriometers, one veriocouple-, one
Western Electric tube and socket,
one rheostat. b battery. and S'~-
vClt Diamond battery. My aerials
are from 35 feet high and 45 ie-t
long, strand. 1t is grounded in the
cellar. also to a water pipe. | can
not receive plain enough to under
stand anything except. NOF. the rest
being a mumbling talk. What
would you suggest is the matter?
Do you think IL is the way | tune
it, | get plenty of whistling noise.
1 have never got anything outside
of Washington. How many miles
should my set receive. Should ]
receive Newark and Pittsburgh
plainly with an amplifier. When
hear tubes a noise comes which
sounds like a machine gun. What
IS that? 'have to turn my rheo-
stat down to get rid Of it.
a. Here also a diagram is needed
to give you a fair answer. A great
number of troubles might cause the
noise you mention. A defective
tube. grid leak shorted, tube oscil-
lating. filament current too strong.
Please include your name and ad-
dress in next inquiry.
Back Papers.
Q. Where can obtain back
copies of The Herald frequently
referred to in answers?-A. II.
A. Address Circulation Manager.
The Herald, or call at The Herald
office.
Loop Aerial Dircctionnl Effects.
Q. Is it true ,iiat nearby sta
tons can be tuned out and more
distant stations tuned in more eff
fectively with loop with an in
verted l. type antenna?
A. This Is true to an extent. more
appreciable because a loop antenna
has the advantage of a dIrectional
ERECT u that is, the coil may DC
turned until the vertical wires Of
the loop lie in the direction the
waves are sent from the distont
transmitter. This places the great
er area of the coil in the magnetic
field and at right angles to tina,
magnetic field which is the position
of the coil for maximum strength
of signals. It must be remembered
that the magnetic field about an
approaching wave is at right an
giles to the direction in which the
wave travels. This turning of the
loop is also convenient in eliminat-
ing Interference, because the in
interfering waves are often from a
direction different from that of the
signals desired.
Distant stations Heard.
Q. Can distant stations, as wGY
or KYW. be heard using a loop
aerial? NE.
A. Yes; provided the set is
equipped with sufficient amplifica-
tion. This is usually provided for
in sets especially designed for use
with a loop aerial.