New-York tribune., 1922-12-10
Alsa.urinr A.risl Capacity

Measuring AERIAL Capacity
clsltl6n- Thoss % - 'rho ha~e ga.
es;si from On. sssina.rr' class n radi7
iion % rsansia.u,s 80 can uslsriaiiv iai-
prove 80 III c'sn - @ rpr rs'r Ore cf
ihe poinia irTrsaa.l on % g. tie correct
bl!tne. bsi~ssa eafae.i. ara lndgs;snes.
suf have Esrsr resa fo-muiR for deter
uiinias THE. Fo- srsmpls; lir srtsnna n
ito t-si' my issl-in ard grouni % f,st
y M -, formula 'A- wave i'as'A e about
ef5 meters Tev AT 70 agur, ria,
sAouli be Tie proper iaGuc,aaes cf ~ vari-
coupler end ths capacity % ny ecntsrs-r.
The very hishes; salelsas.7 Arsia. rrs ars
tod that a rsFiss oondsastr cuts doEn ths
strength of the current rhsFsfore con
c'ude ~ Uoa.d =. BE- 30 20 HHur- the IN
eonasnssr scr,s, ~, coupler. iis- an 7
g. nEur, ih,si q arr no. scared - ioGs.
ne one cuotsi ab8vs. fof q seTlalf =.
uisr, - 'h0 cogc.arf can fs' rca-sct
fry acr;t. 20 th- ssGiuning OF ny finris
isr4, ih@ naA.s "t thsif eTiteh % tAs sA.f,
OF tht "a i.tso tr'ssh And the cad q ths
sa r-si'J mESirS M '0ritchea oY-Dtth
fc-oFs ths iaierrslirg cci'A Wh'rh cor'iaua
- conduct acc9rdiag = ths -sutnsi -.
20 To- ihan of ,hs arr, sTiie,i sal ,ss
g-ognd 30 ths rhsn n the rsc5rd. lot
in thie case I get dsa1 ends. which.
ain tolc. r-fp,, efieisrc". iior ean I
avo'c thi@l a. r. - yru have earger.-f
zone urae sC3 the r,atc rsri0mt't- -
rsrrr efficient 2. itH rotor hss fVltr q .
tg. .4lFr or iIrlf O. the rfif rarior.stef.
would 3; 81 psfmissib.s % unHla1 ihis r5to-
fn1 uas riaa'!ar wirc, - ~ % SET 'r'c1
49, uur - ~ tr-ar, or you'd tniT rlhsi-
sree fhr circsii 0w'ag 4 fnf Increased rg.
ffNanrc Z rrie 90 al tLs 4he.4i tha'
o; me , battery. -, ia ~. heos-gp given
Ngrcmoe- &; 1 !oias1 90 iaq rainu' sfd
I .af tha- mc~t q your coafrcrcn seem 20
prefer io'n'as % 70 no minus rheorei-
icaiig. OF courre. you- conttntieu ihaf tha
negative e.ecirce. would hs attracted end
lasr@iorc leak OK more readily 10 q Pie u
correct. electro rta'rhiig. lu' would 70 hn'f
with = etrarl'- eiren,i ~ go. er?ec'a r.
D. ta'f-ry ins--sslaz . negative tis1 o.
sAo sTii ~. =. l..
-cr-The formgla that you eve
dettT;aires The natural wave length %
your autcnnn onlv. In order 90 de-
and capacity Fh3ull % used "a circuit
With THE for ;he grsstest efficiency n
receiving any particular 7are length
you would have - know .Ae exact
capacity % -ou- aerial, ard there is
no AWAsa kAANH aAtaH
would give ven thif Nth CNsctitute,
as there are 70 many variable cone.-
tons that have % be taken irto cons
liberation.
As matter of fact, TIE efficiency 10
.his ride OF tie receiver "a not nearly
70 important as u Is IN other part'-
such, for inatsEce. 90 the vacuum tube
itsc.i, and tho Dlsts circuit oi tss'
tube or the feeshack coil. The aeeef'
cary thing. Of course, % 90 is % hay
thc current rclstionah.o of esfaeit'
and inductAncc IN The aerial tuning
Circuit, in ordcr % place = into reso-
nance With the trauSmitting station
4 but In practice. who're more ,apeeity y
usca, /. viii be found that elightll
| less inductancr 50 needed, and vie'
The mo-. efficient method Of con
meeting uD the primary of vAI,o
c0uplor a. a. follows: Connect ~
/ aerial % one cad OF tAc coil and INC
I Ground % tho other. Then take . leae
from The point where tAe eeT'al ~
connected 20 the chaft of the mrs, q.
tho tvo ,witchcs. Take another !eac
s,o-, tie noin, where The ground j.
ro-rcc.ed 70 tSc coil % the shsft o'
,he second group of rT'iteh .pointt' d, lI lI
/ mis- manner you viii Re dssd-eaei ns
III - no uru, ed t.rrr % the coupler
arl thus eliminating any Foesi'ie
iosscs due 60 open turnr. ,,,
DO not remember having as;d ~
the grid variolnete- should so ,iaa!,e,, y,
,San tAe plate vGr.ozetsr, but y eid e,,d
b v,gs entirely IN error, as, siteF a''i
.As 1mour. cf sadue.Anee In q raf.'
o,.o,e- ,s determined ~ its rettlng
wi,h regard 70 the srli lesk beine
( ,sised 20 the positive side Of The -
! b,,..T~. this is sbsoiuseiy correct and
80 Slszrsra shoT.,a Il otherEise =
ire,rrect. and am AFRAID tha. l Hi1s'
riead ruilty 70 having printed d'''
gr~-. incorrectly Ia this case.