New-York tribune., 1922-05-28
Weird Noises
In Receiver
Unnecessary
-s,calls. Squealing, Frying
and Other Noises Can Be
Removed if Small Details
Are Carefully Observed
hue to Simple Causes
I,ue Is Trying to Make Horn
on Phone a Loud Speaker
When Volume Isn't There

a result sounds like ton OF coal be
a, dro7ped down & chute into +be
Il IT,. % ,-e.;oa
fli"' ''i" ~ IN
4 ances by scrleS' OF noises that in
- -espects correspond 10 the uiCb+.
= ,-.s-.e Of tho folire 4rih, ~
z e''>>' ..,...-. ''0V''
y !. 'aeSe eoaa'''o'lS are d0e 10 perfectly
B ss'detned causes and can be clint
3 .,;sd. q a. leaS' SO completely modi-
& 4 as . make them neE,ig BILE
= the fret place they are cbfoa,,
- 4.c. .,a+ -
= ~ AIS really
r*seye I'm norm attached to & tele-
4 .,ore receiver makes loud speaker
/ - ,ba, i amDlifcs sound Tb;a
ms -
&' 'Ae sa'''' p.'0'S O. aircraft
iFsc mag He theE can hold the ma
j.,ine up IN tho ar with their hands
iGte- the engine has died out. You
daanet get ioud-speaklng results with
4 IN horn alone, any more than you
H., hold an alrplane up IN the air
ri your hands.
4 J, is quite possible, Of course, TO
4 1lI,s TN horn attached TO q tele-
ss,s receiver for the purpose of get
IL loud-spfaklng results, but the
ashe hiUst DC mere IN the telephone
sewer oeiore TINS can be done. The
| err merely directs the volume of sound
4 gEard in the same manner that a
1 agaphohe attached to the mouth di-
's;s the speech IN one direction and
aAoleS Ire sound waves to travel
.Ither IN one particular direction.
Il Caused by Too Much Current
q have ,.;,.er +b;s v,loa.:
5.r "a ,~ovoro ~, W. III
L., - d.. o.1,sa 80 4to "t'U nov 3
a. rslisr in +ba ooiio'5 ..,.I H'l>'
l,s,ker" J.. j. no,,go4 b., ,0V w. i4uo taa4
Lar tbe onera+or - ordor '',e a.
,+s on+ - bis >, 30 IL. aL;ft ~ seo -
H., TOO ,,,,,l, o,,,,. q" py'.' =" ~ :
-ss. j., &c eo+ Ia 49, ~, oi 'i'e Naouun.
.sv re+ roai CIV, ~r,u ''ae 49, f - ina
III Tba+ s'S e. ~''u ~ elo"i aIu
,ssos - ko,-o r,a+boroa S,.o,,, 'a--,si .aa,
81 ~ .ha E,s,,Gre en l oii d sle"t
an radio fa1s Apotber co.,so "a ;n
D.. desigr of +bo an,ora+,s i.soIe o,,a
a.. annlies nar,ic,7ia,l4, ~ so+s 49,
4 we heer asssn,biod or oors+rnctod Nv.
- themselves
q Ehen using the vacuum tube detec
3s alone these noises viii not be
Swy so apparent. particularly if the
@Tum tube IS not in regenerative
felii. 1t Is when we come to the
suoh OF alnphhcauon that TINS
@ pace 10 must oe understood
Z. win aualo-'lequency am plinca-
-@W are increasing the volume OF
''i-'@c1e N1s' correspond Ilth
h.1s audible TO the human ear 4hat
tq Gehcles "h!Gh 90 not range
--'I I,ah o'ooV Nlora''ohs d SecoIlo, a.
wv 'he ira'lSI oIiilers lilat are $50
s"etH eacn oI the am u7ii1S Ine Vacuum
nga or arnlifv froGuencv bands hat
pond to the rapidity OF vibra-
is which are audible. Therefore, if
-Ge s any noise from the detector
1 RON the first amphfying bulb which
i 1es within this range, it Will tc
iapiied and reproduced in the tele-
oHeFreceivers.
y IN this connection it is imperative
aaat all wires which connect the vari
9i pieces Of apparatus togethe. should
sN short as possible This Is par
@lAfly true Of the leads to the grlnds
4 he amp ing tubes.
Connections Must Be Tight
| sro.bo- VOW, ;,,,,or.a.,+ ,ti,,c, f. tho
is-rec,;cr. .I,ey,.so1,I,s Tbn,. n''.s+ be
jssolr,el,. .;,.t4 aod eLoull b0 s.i5orod
- cav L.I- @,'lo;'-I' Is +G,,+
lonsa e.. l'0,9'D., ,to
nnfir. any ,' 10 u ooo o',o
viii y;5rs4o 'Ttt';s Tb; v.;% ,bra+ir t'io 0o co
H. esn.ss h., o,,. '.,9 a7r;,'g u- s,1rb
Irrset tram ~. 8S ag, 'a1 one * .bn bnn7
t,od .nd any IN. ol'e ~ ,'s, ,,'',
ard every & ,;o 80 yG'.o ; yo ;bratcs ,,0[,e :,
snporar,ly 5;.ronUoo.s q, 'oDo +ba so+ and
earAcfs ~ 7(ol'i.oO - ,.rq t,no +ha
ssas frrc+ ~ "Ea'n' li,.e,i ,,d p,'i's '.'
] IuHcl'Oh oil the CIRCUIT ana cauS-