New-York tribune., 1922-03-19

1
yo" live in tho country give xo,,r
distance from New York.
eron' rheostat, grid condenser and o-;5
''"A' large loop aerial Whv don,t =
near Arlington? Is it the aerial or +ho
tuningo VI inc
At is combination of both ~
I '"e nrst place you can't hear Ar,;ro4o,,
"''" loop aerial unless you use two
stages of amplfcation at least " a.
second place You should shunt var.
ao.e condenser of approximately oo5
ma capacity across the secondary of
your loose coupler. l would adv;ss
you TO erect an outdoor aerial.
W. ~ B., Easton, Pa:
Q.-I would like to know +bo
'c"e'h Tor onc-wire aerial 35 feet
above the ground. The lead j., ;s
fve feet long and the ground sft,on.
feet long.
A.-Thc fiat top of this aerial sbonld
be 1875 feet long.
r. K, New York.
Q.-l have vario-coupler. n,co.o
tell me If | can use it the Same no
loose coupler? A.-Yes, it will be moro
efficient.
D. K. NJ, Peru, Vt.
Q'-i wish you would explain to me
why often get KDKA and WIZ as
WE'LL or better, in the daytime as
do in the evening?
Al cannot explain this. # is CON.
trary to all usual experience. Signals
are invariably much stronger in tho
evening than during the day, and this
is supposed to be due to the fact that
during the day an ionization of the
ether is caused by the light waves from
the sun.
Q-Ihsy recommend 221a volts on
the detector bulb, but have to use 45
most of the time, though some times
get good results between 80 and 40
volts.
A.-This is probably due to the fact
that you happen to have an extraor-
dinarily hard bulb. The normal de-
tector bulbs are usually very "soft"
| and they will not stand more than 22H
volts
l.. II. NJ. New London, Conn.
Q.-ln taking a portable wireless
outfit to camp would a big tin can tull
of ordinary water with copper strip
in it make a good ground? If not, can
you tell me what would be salts
factory method?
Alt would be best to bury sneet
OF copper or copper mesh four or five
feet square. The mesh would be best,
IS you could roll it uD for transporta-
ton. Bury it in good soft, moist earth
A better way would be to attach your
ground wire to a metal picket fence
if you can find one, or better still, if
you are near d railroad, or urban troll
! ley line, connect the ground TO the
rails.
Only Two Coils with Crystal
Miss l. G., Brooklyn.
o. have honeycomb coil mount
ing with three coils, 90 turns, 80 turns
and so turns; one pair of 22O0 ohm re-
j., ceivers, one crystal dctcctor and rs feet
Of wire in one line 10 feet high on top
Of four-story house. I'd like to know
what kind Of variable condensers I
need to make the set receive music
from Newark and how 10 put every
thing together
A.-You will not be able to use three
coils with crystal detector Two
will be the limit, one for the primary
and one for the secondary. You will
have to join vour aerial to one end Of
the primary coil, then attach .0015
mid variable condenser to the other
end of the primary and a ground con-
nection on the other terminal of the
condenser. You will have to put &
.0O1 mid variable condenser across the
ends of the secondary coil. Then from
one end Of the secondary coil Join one
side of your crystal detector; the other
side of the detcctor should be joined
to orc of the telephone terminals and
the remaining telephone terminal
should be Joined up TO the other end
OF the secondary coil Your set will
then be ready to operate
". S., Providence. r. l.
O.-I have regencrative receiver
employing a detcctor and two stages Of
qualifications What plate voltage is
best for my set?
A.-22A volts on the detcctor tube
and 45 volts on the ampliier tubes.
Tho same 45-volt battery can be used
for both amplifcr tubes.