The Washington herald., 1922-04-12
Questions and Answers

could get any local points with an
aerial SO feet at one end. Is feet
high at the station end. 20 feet
long! The set consists of a crys-
tai detector. fixed condenser. Brown
phones, tuning coil and variable
condenser.-M. V. II.
\. Please send in diagram OF
your hook-up.
Baseball Reports.
Q. Will. you please publish the
time the baseball reports will be
broadcasted. wave length. and ii
they are sent daiIy?-L II. 10,
A. Sent following 10 p. m. Ar
lington schedule each night, 2,65C
meters
Transmitting Range.
Q. Would you kindly give me
the transmitting range of the fol-
lowing stations. Arlington, Pitts.
burgh. Schenectady, Chicago. San
Diego, San Francisco. Berlin, Ger
many and Eiffel Tower. PARISH
Z. w.
A. This question cannot be an
swered definitely. Transmitting
stations have definite wave
length en- which they usually work
but range is dependent on the sea-
son OF the year, the power of the
transmitting station. the operator
on watch and the receiving appar-
atus. We may give the following
approximations gathered from re =
liable sources. together with data
which might be used for reference !:
Arlington (NAA). 1850 meters.
range 1900 miles; San Diego (NPL).
$4,000 and $500 meters. range 3,OeO
miles: San Francisco (NPG). $500
and $500 meters, range 1000 miles
Berlin, Germany UP). $500 meters,
range not known; Nauen, Germany
tPOZ), 1850 meters. range 5000
miles; Eiffel Tower. Paris CID.
10000 meters, range undetermined !;
Chicago. Great Lakes (NAD, 500
meters. range undetermined. Pitts
burGh and Schenectady have radio
phone transmitting stations which
you undoubtedly refer to. On &C.
casion these have been received
over several thousand miles, but not
as regular thing. In the Herald
or April was given a map show
ing the points on the globe re-
ported received from KDKA. As
rule $50 miles Is fair range for
these sets. NOF radiOphone trans
hitting was heard on one occasion
On the Hawaiian Islands. and is
regularly received throughout the
middle west. But no station can he
received without fail. at its MAY
imum experimental range.
Receiver Possibilities.
Q. Is 1t possible to hear WIZ or
kDkA with S0-foot aerial, AZ feet
high at one end. 25 feet at IN.
other: four strand. 1O-foot lead-in
loading coil: loose coupler (navv
type) two variable condensers. grid
leak. grid condenser, Radiotron
vacuum tube, 1000 ohm phones, Ii
not. what addition will I need tn
hear them. I hear all Washington
stations broadcasting very loud
what is the approximate wave
length of this set?-F. F. d.
A. 1t is possible. that you will
hear WIZ and KDKA but not very
likely. I can best suggest that Won
refer to The Herald of April ., in
which was given a complete up-to-
date regenerative receiver diagram
with the aid of this diagram ana
the material you now have You
should be able to make a satisfac-
tory hook-up. n not, will be GLAD
to give you further assistance.
A Battery Circuit.
Q. In the A hook-up inclosed e.,
Fig. 1 or 2. the best way of ar
ranging the A battery.
b. Would a. variable condenser
shunted across the phones and b
battery as indicated make the re-
ceiver more efficient?-J. T.
a. Use hook-up No. 2.
b. Yes. You would need this con-
denser for successful operation of
the set.
TOMORROW, DETECTOR CIR