The Washington herald., 1922-07-12
Questions and Answers.

1
twenty feet of insulated copper wire
for lead-in. seven-foot rod for
ground connection. one dry battery.
When the battery Is connected to
ground and aerial plugs hear a roar.
Can you tell me why 1t Is can't hear
Washington fifty-hve miles away. or
what I can do to hear the distant
| stations? - T. f. s.
A. / do not understand why you
have a dry cell In the circuit: none
was required In the diagram referred
to, and would be Of advantage in
such a hook-up. Otherwise your con-
nections are apparently correct. An
| other diagram of this set Is being
forwarded to you for comparison. 1t
is unlikely that you will hear Wash
ington at such a distance, particu-
larly the radiophone stations. Con-
nections sent may enable you to hear
| NOF. By making a loading coil of
No. "a double cotton-covered wire
| similar to the coil you now use for
| tuner. and connecting this. one end
to aerial. the other to your present
| coil, may enable you to reach 1850
meters. NAA darlington night)
transmits on this wave length. spark
code. You may then hear WWX.
Washington Postoffice. on 1,16o
meters. radiophone. At your dis
tance from large broadcasting sta
tions a vacuum tube set would
prove much more satisfactory.
Receiver for Long Distance.
Q. Please let me know the best
H.,
nearest broadcasting station to Ship
ton.-R. Z. S.
A. In addition to the broadcasting
stations in Washington. you are sit
ua.ed almost between WSN. Norfolk
| Shipowners' Radio Station: WAAO,
Charleston, W. Va. and VIVID. Nor
gantown, w. Va. Directly north and
this side of Lake Erie from you are
no less than twelve radiophone broad
casting stations. within a compare
| lively few miles OF one another. The
nearest of these stations is approx
mately the same distance as Wash
| ington, namely. 142 miles. You
| should therefore have a vacuum tube
set with one or more stages of am
plification to insure any regularity
Of reception of radiophone messages.
No recommendation of particular sets
on the market can be given, but il
| you desire TO purchase parts and con-
struct a homemade set the wiring
diagram being forwarded is suggested
station Call.
| Q. Who is 3ZI? N. NJ.
A. Roy c. Corderman. Hagers-
town, Md.
Loud Speaker Eject.
| Q. Can a galena set be made any
| way to use without phones and hear
| loud signals. that is with a loud
speaker? II. ].
A. An amplifier may be used In
| connection with a crystal detector.
although in all respects 1t is vacuum
tube hook-up. requiring A and B
| batteries. rheostat and other parts
| as for the usual tube circuit. To
avoid this the experiment has been
made with some success of pacing
one side of the phone receivers
into the mouth of a large phono-
graph horn. from which tn. sound
would appea: TO be smrli6cd. This
would, of course. he satisfactory
only when signals through the
phones were exceptionally loud.
observation-disclosures Regeneratfve.
Q. Please send me a diagram of
| Armstrong Regenerative Receiver
Patent No. 1.113,149. using a vario-
coupler and two variometers. On
| the diagram please mark the pri-
mary and secondary of the vario-
coupler and variometers l have a
blue print OF the circuit mentioned
| above but the primaries and sec
| ondarles are not marked. so before
l start wiring the set l better make
sure of the connections. S. w.
"A. A diagram of a standard re-
generative circuit embodying the
Armstrong principle is being for
| warded. The original Armstrong
circuits have been varied to suit
| particular hook-ups and are salts
| factory. The originals used by
! Armstrong may be obtained only ny
| application to the Patent Office.
For distinguishing the primary
| from the secondary. on ~ariometers
or variocouplers. the stationary
part called the stator is practically
always the primary: the rotating
coil called the rotor. is the Sec
| ondary.
Special Messages Picked Up.
Q. who were transmitting 'Tn-
structions in making a receiving
set" about 3 p. m. July Z, and a
concert from 1920 to 1850 p. m.
July Z. E. A. X.
A. Any reader who was trans
mitting at the above hours will
please answer the question for E.
A. X.
Receiver-Limitatio tons.
Q. 1 have a crystal set which /
made from directions published by
the Bureau of Standards. l receive
the following stations: NOF, wMU,
VIII. WPM and the Church of the
Covenant. The latter receive
family. Can you tell me why I cam
not receive NAA, WWX and WEAS.
| (b) Please advise me through
your columns who NSF, HUA and
3XZ are. L. NJ. c.
A. The only schedule Of NAA you
could possibly hear is their IL noon
and 10 p. m. time and weather re-
ports on 1850 meters. 1t would be
necessary for you to add a coil OF
several turns of wire to the primary
of your tuning coil. and insert a
variable condenser across the sec
ondary to reach this higher wave
length. These signals are spark
code. This may also enable you to
receive wwX on 1850 meters radio
phone. Both stations transmit on
wavelengths far beyond the range
tof your set WEAS is of lower
power than other stations you men
ition; IL you will forward a stamped
envelope a diagram will be for
warded for increasing the sensi-