The Ely miner. [volume] (Ely, Minn.) 1895-1986, 1922-08-18

mat most small or cheap selS IAN
not tune out local interferences.
That grid-leaks are not used on
crystal detector sets, but only on
| vacuum-tube sets.
That q large tunlng-coil with wires
! spaced closely will give better results
than short coil or one with wires
far apart.
That a vario-condenser and loose
coupler gives finer tuning.
That a vacuum-tube is about thirty
times as efficient as a crystal detector
That a wave length has little to do
with the distance you can receive.
| That 5000 ohm receivers will often
raise q cheap set from inefficiency to
excellency.
That a loading coil is not needed
with a loose-coupler and variable-con-
| denser.
That If two or more crystal sets are
used on one aerial only one can be
used at one time and a switch must
be provided to throw sets out and in.
That a loose-coupler is better than
tuning-coil.
| That a loose-coupler should be
placed between aerial and ground.
I That money saved in buying cheap
head phones or receivers is really
thrown away and that great deal
depends upon the phones.
That aerials and lead-ins should be
shunted across head-set.
That in setting up an aerial one long
wire is better than many shorter ones.
That the lead-in counts and long
lead-in is an advantage.
| That aerials and lead-ins should be
insulated from everything else.
That aerials should be placed as
high as possible.
That when placing aerial near ele-
waited structures, wires, bridges, or
steel buildings it should be placed at
right angles to them and as far away
as possible.
That 7 strand, phosphor-bronze wire
is the best for aerials, but ordinary
No. IA copper wire will do.
That continuous waves penetrate
everything.
That the lead-in from aerial should
be at end of aerial which is towards
the sending station you most often
wish to hear.
That aerial does not have to be
horizontal.
That for sending, many-wire
aerial is far better than single wire.
That a counterpoise is better than
ground, particularly in sending.
That an indoor wire will serve for
an aerial, but is not so good.
That an iron bedstead or springfield
will do for an aerial in case of neces-
sity.
That the simplest and cheapest
vacuum-tube receiving set Is better
than the best crystal set.
That the best form of receiving set
Is the regenerative set.
That a vacuum-tube or regenerative
set may be amplifed to almost any
extent.
That an ordinary photograph horn
attached to a head telephone receiver
will increase the sounds somewhat
and will act as loud speaker.
That a variable-condenser helps fine
tuning.
That the filament battery of a
vacuum-tube set may be dry bat
terry, but that it is more expensive
in the end than storage battery.
That the Ultra AudiOn circuit has
the plate circuit led back to the honey
comb-coil and amounts to a regenera-
tive set.
That the best type of vacuum-bulb
receiving set is the regenerative with
amplifiers.
That each step Of amplification re-
quires another tube.
That If there are too many turns
on the inductance they may be taken
off to secure tuning.
That the distance you can receive
depends upon various climatic and
other conditions.
That the filament lighting does not
always mean the set is operating prom
erly.
That If filament rheostat is turned
on suddenly the filament may be
paralyzed and must be left to recuper-
ate before it will glow.
That burning the filament too bright
~ merely wastes the filament and
shortens the life of the tube without
adding anything to the efficiency of
set.
That variable grid-leak can be
made with pencil marks on paper
and may be altered by erasing or add
ing lines.
That some tubes are best for de-
tectors, others for amplification and
others for transmitting or. as oscil-
lators.
That IL is often cheaper to buy
ready-made accessories than to make
them.
That all joints in wires Except in
binding-posts) should be soldered
That the ground connection should
be soldered to water, gas or similar
pipe or to large copper plate buried
In the ground.
That the steel girder or frame Of a
building makes a good ground.
That sending or transmitting sets
must have license to comply with
the law.
That the fire departments have spe-
cial regulations regarding the installa-
tion OF aerials.
That an aerial cannot be placed
across street without permission.