Atlanta tri-weekly journal. [volume] (Atlanta, Ga.) 1920-19??, 1922-04-27

II live AZ miles from Atlanta. Will
set consisting of one pair 1000
ohm receivers, one Turning coil,
fixed condenser and one detector
with antenna receive concerts from
WSB? How long and how high
should my antenna be; also what
number Of wire should I use?"-L.
S. Griffin, Ga.
Answer. You do not state whether
you are using crystal detector or
vacuum tube. If crystal detector,
the parts listed are all you will need.
Your aerial, for best results, should
be 200 feet long, including lead-in,
and about 40 feet high, using single
strand Of No. IA copper wire.
as there any other detector for a
powerful set other than the vacuum
tube?"-A. Meg, Decatur, Ga.
Answer. No.
what causes a loud singing noise
in the detector when I use two
stages of mplification?'-C. W. L.,
Eastman, Ga.
Answer. The noise probably is
caused by burning the tubes too
brightly. You should place thin
sheet of "stove-pipe" iron between
the first and second stage ampli-
fiers, and between the detector and
first stage; ground the frame of each
amplifier transformer and the sheet
iron partitions; also ground the neg
ative end Of the "a" battery.
81. Can controller to a small cleo
trio motor with six different contacts
be used in place Of a rheostat? 2.
Will it be as efficient as the rheo-
stat? 8. Which is better, vario-
coupler or loose coupler? 4. Must
I use a Variometer with a varlo-
coupler? How should I connect it?"
f. Med, Madison, Ga.
Answer. 1. Yes, if the resistance
is as high as six ohms. 2. 1t should
be as efficient as rheostat, but not
as neat in appearance. 3. Vario-
coupler is best for compact cabinet
work when using Armstrong regen-
erative circuit; the loose coupler is
preferable when straight tuning cir
cult is employed. 4. Yes, vario-
meter should be used in grid circuit;
efficiency of set will be improved If
another variometer is used in plat
circuit. The grid variometer should
be connected in series with wire to
grid connection of detector tube; the
plate variometer goes in series with
wire to the plate connection of lube.
(Which is better, indoor or out.
door aerial? If indoor, where would
be best place to put it'll. G..
| Marietta, Ga.
Answer. For ordinary purposes,
| with low powered set, the outdoor
aerial is better. The indoor aerial is
satisfactory when radio frequency
amplifier is used, or when the re-
ceiving set is located near a broad
casting station. One turn Of double
cotton covered copper wire around
the picture moulding, leaving one
| end free, will make a very good in
door aerial for short distance work.
Where can, I purchase aluminium
and lead electrodes? What will they
cost?'-S. P, Gainesville, Ga.
Answer Consult radio supply
dealers in Atlanta or aluminium man.
ufacturers advertising in reliable
radio magazines. Pure aluminium,
costing about 81 a pound, should be
used. You should be able to obtain
sheet lead 1-16 of an inch thick. for
electrodes from any plumging shop
at Is cents a pound.
els it possible for a radio set to
pick up wireless messages? I have
crystal detector set, using 500 ohm
receivers and aerial Is feet long and
So feet high. IA Bug" Atlanta.
Answer. A radio eceiving set re-
ceives both code and voice. You can
obtain better results with your set if
you will use 1000 ohm receivers and
lengthen your aerial.
IT live about twelve miles from
Atlanta. WouIu I be able to hear
your concerts with crystal detec-
tor set? What will a detector, con-
denser and phones cost? Will loose
coupler, condenser, detector and
phones be all I will need? My aerial
is single copper wire, 35 feet high
and IT'S feet long, with a lead-in
about 25 feet long. &c. M, Morrow,
Georgia.
Answer. Crystal detector sets
have an average radius Of about 10
miles for the reception of voice and
music. Galena for a detector will
cost ten cents, condenser fifty cents
and two phones Sc. This is all you
will need for the reception of con-
certs from WSB. Your areial is
high and long enough for ordinary
purposes. BY putting it ten to fiji
teen feet higher, however, you could
increase the strength of the incom-
ing signals.