BSTJ 30: 2. April 1951: Some Design Features of the N-1 Carrier Telephone System. (Kahl, W.E.; Pedersen, L.)

21.7 MB·English

‘Some Design Features of the N-1 Carrier Telephone System,
By W. B RABE wad L, PEDERSEN
stmooecrios

“The comoaiaswhica teal fru: saring the ent af Tine altos am,
fe tumber of ehearsl, and the racamsin aévarcages of eam eeuite
GG the form of high spond teisission which minimis delay ne echo
fii, lor nel. laes al high ally}, have combined to bring about
{romiton in long diate irony. Whereas teen years ago only 99
fhe leet mileage of dhe Hal Syne as ariel iy aera
‘uve Greil comprise about tviril of the total mileage. The min
‘rum datance, however, for whien carrier can economically replace voice
frequency tminsmisson his been Iited by che cot of the caver eat
‘ent, the cost of line trenment, tho expeae af installation and soins
Sub engineering, and the rsinanenes ert quite. Aa eeu, the sorter
toll cies atively lage fa numer thou tie cect mileage, have
‘int to pen 2 wise Gracey. The ue deve Tyee Ne
Cartie Telephone Syst s ined prinasly at expanding the appleacon
for carer ito ts rb of short Fae saree A expla skewer it
is dened ca obtain the advantage of career fr to aad exchange eable
‘deci for lengths small ction ef the previous esynoa'e rina,

‘Meny efetem and ret fentares contribute to thi end ‘Tee ere 12
cannes por system sith & ke peng Heween ease ‘The cami wl
both sdebonds are transmitted, Al of the pais in a single cable can be
sel for Type N without special cable treaineat. Repeaters ate spaced
(6108 miles apar depending upon the gauge ofthe cable conductor. Power
isd over the cle pts tro out of every thee cepeates, whieh can be
pele mounted. Different ‘tequensy funds on ditfeens pets in the sme
able gee wae for oppose diteiaw vf aan, (1-10 be iy ne
luca, end 16L 2 ke the otee. The equcary bandvane inteschnyed
flict at exc reponter rae portant yes of ost hye 20
Tovide eutorcatis equifzaton of actentaticn slope. Comparer, built

Into the exzre: tera, mize he lve specch alums pir to tansy
ow sed estore Chom after section, ete minimizing the severity af
fanssalk nd noise problem on the ine a inthe trminas. An out of
Teun sigaaing chaanel immediacly abuve Che sch band povided by
en squipmens
sof cannes risinaae sesret 19

Important ns Vee sem nel a, hey could oe
in thamseivesacomplich the objectives af sal maractring cy in
Thum engicering by the castomes ewe of intlaten, eal sata
anion of maintenance efor Cntrating im linge reset the
vel uci ofthe Type N Stor ae en teapot fates
iSite conporenta nal einen, wi i conto et ct
btext fom the past Minit capone sad pone
Seely tecmiguey yh ne redo se ead weight, United
Construction ih packaged sobs at only simp inealio,
bat grey facltses the nding ad coestion of tbl, pening
shipment of deictive uit to » ena it for oretaling wl Sheree
‘aaking i pout to msitsin the working eam tht personne
‘ot highly tne cane tecigue. A fren contibtin to ese of
‘ountnance aa bs mde tn ato stacey eatnion ofthe lo
GE componcnss in oni to avd te secre fo fngnt repeat
“Tose sk ee fate of the Tye Neri ae secre Ut
reper, whic decree Get the wnat aa ee acer, 2
ithe den of the eqapaene ace

Tnswirons, Coescmrons, ss Isotetons

The evel ereagements of the NU Systems have been designed ih
alegeate earns to permit eros ne a he ow cos ama apa,
lstre an! potentiometers commercial avstacane, Dest enebor
east fet appcation where high sini yest x mente, we
Tittoousenarel cate ess ss ed nary higher ewer sgn ia
pied

Cayuctanses of several microtaraés oF mos must be compreseed Sato a
‘al volume for mini aedeysipmeat_ Aluninun dectroyte capacitor,
hick Eve been ated fr this puzpose, hve lint fe due tote suscepi-
Toy of amin to eins by sonminn ieagsats and coutanizante
In he Type N Syne, high eayahy, nage tatalun leat capa
‘ore ofboth pole ant en-pote types ie det Hell Speer ap
Plienton’. Thee tanta caparitne are rider salle tah the
Euminam type, Two lypes of fant capacitors are wed, In the sstred
Iype these made by pessing yo deved tantalum into «compact shape
fl then sintering im an esau weld i ple patie This
Creates porous tes tn which a atively Inge steace ates ie ecoaed
for orle Gly lovato, aul ee «lng caeitae pet ut vlute a
uteri f ota Tr the fol tsp, tm fn ssn ane wound in the
‘conventional manta invos esadeéal nit wih < paper sparstor. Size
0 rma aan soto teem corm, APA I9SL

reduction is reise this type since se heh tone strength of tantalum,
Povmitsmeaafactre wig, vy thin fi, Tron the oasured stability of
the tantalum ode fim, and frm the rowu imnwuniy of tantalum ta
tack by acid regents it cudeladed that he He atlam deetatic
itr wil I spveralLues tht of the cozesponding shuminnms eeteo-
Iyer espacio. Tove enpactaney calle ae in preduction for use in the

1

1-4 Syste: one of the simered construction, 4/0 vols pola; a two
tthe fail constuction, 1/150 vit pla und 1 mi/SU volts non-polar.
‘Examples ofthese capacitors sr ilstrated in. 1

“The inductors emplayed in the Type N System are of sever (yp
“Two tidal type inductors, cach wound over 6 srl ow cst molybdename
permaley dit core aren in The wee frqueey fillers wl in allery
Supply lede. Individually mated dao-laterl wind etore Sed ap
‘lction i interstage network, Tro duo lteal type inductors wound
{common mala penal rar te

‘ae ui in ese frequeney Hes,
vel esanmee seEErRae syBceA 1

Adjustable magnetic ates are used with these later inductors to faciieate
Drei tuning with asain’ capacitors. The mutual inductance inhoren,
between induscone woud inthis manne edie a he eae ofthe chanel
Bart iers. Tr the sigh are ow pose exer Frequency filters, whece the
fet of baal inductance is detriment! to filler perfomance, «sma

4. pusel pir dees! sinding on wslenet rum elas ome Pigs 2
traces sme ofthe tors sel Cie stem,

“Taassronirss

In the éransorme designs won he ysves Dols nina ae
lowcost are attained threngh the nee of fer aes al earn porte she:
ter posi, improved marinus eps allering Ee use mach
$ner wits thom Reewfore penta, a) elplessting mb's fr al
design. hor the vole a sgscling cee eaters where there 20
‘apenas eet curveat Towing Linas the singe, ta coe suc
ate consis of Tnteeaved “Band “1” pesmelos lnninasions. For ae

el cane exceenon svar as

‘The caver fegnency transformers algo eseuplify sl sie ‘They ace
alike ia nimctor, employing acetate fled windings assailed over sal
toroidal mlyhdenur permallay dust enree which are broken i al ba
serep the winding assembly ahd cama! agriber agin, ‘Te winding
and ote aesmbly is sappated fom Ue lennale which are mole Sa
the cover plate, This constreton methad forter sips ‘abrcation by.
climinetng the vee of intermtiate len! wire rom the winding ase
the fw of he winings being conneted. ditcety tothe traserme=

AL teers ae bowed fn sown aliaum cass and ate cig
Js Cea mealies inthe covers for mounting, Coraturtn fae
eons ofthe various stators ate toe in ig. 3

gt Gooner ea ney aelior l

cxvseats

‘The 12 channel exits Irsquensiee rogue fur te system are supped

guarteciys} ttl verter covering the rage of Me
256 hein B ke nage. Toew crys are 45° X cut guste las operant
tna fundamental exteronal mee, with old eesides pated on the
naj sna, wire mounted and heretical ele i metal ses wh,
‘mening le The ees! ued to cot Se 3 keener sup cele
Tet forthe pry randalntr ea DY quant capt lav operating in tae
Sear mode, sicrvise iar to the esa fr Ch sel Ie,
The to ceigas ae shown in Fig

vVanasrons

Nealy cit hurl sll germanium vaitore are uaa at cn ele
ments in he ternal of ap N-1 system, Egy mare han alo his
404 rn oc apt cumrweas. ora, APE 1951

rmamber ane weal single keats to pecform suc fy
Tes bias conto, rele, vtanne emit, key for sigan, fr
ftvemy, voltage dviler shy igang ees nd eunrens divider in the
‘Bre vai. The remainder are sesmbled int three gros of are

fully elected units, for wo he channel mot

oct unl the expcador varies respect

Unit shown atthe lve night of Bg 5.
‘The comprar loser srsons are of special interes because of the

important fancion they perform al the way in which the dice clase
set cxnmmen reurran se 25

limit nowtncer Garactetie& odined, At the left a Hig. Sis a view of
the compessor vain ler asembly unl extending to the right the cts
Dpnents Tra which i comsruced, Snr construction i ase foe the
fxpandor al chaenel modulator units, The vats wis Ganon hy
‘itu ofthe fact Liat Lire irpelane cm be varied and sey co
‘rolled by a de bia, Consent, wen mle» por of saute neck
and eanta lat hy es Be pectin te asl evel the compo,
‘elie rmpries one varstoreements, 0 Bese inseam
Tis asthe signal eres; wie i fret wes, the expan
whith compra pe verstor element, cau be nade lo decreace it tema
Vion eth eereasog sigal. The clase deer ta which the compressor and
cxpunor characteris complet each ther makes it neceisty br
Tse avetor eles ial ane vere prevely cone ato Ui en
ce at specie values of bisseuerert. Thief aceomplichec by ent
eenion of elements whies comprise only Lion f theta detbrion
ft characteristics pratierd ad osen avupng tae slete wit 9 o-
Seoblis ae asus’. Tse sleet roi must Be pass eso oon
eucemants whi are ney eee to tae conpsaor porn,

“The channel mda ele compote ofall german vatstars
Tut, unice the variodoses, the madelstors do all have ee ube
Tne. Hig suicest tka the four elanenta camprixing say one mec
tor he alike to tol the ears ik One mocuator rey Cis dee
osidersbly fst aretl in iene,

(Copper exe stead of tani vacbvons ace wee in the group ae
aunt at teres rl pore hose tht lower iyestane level aid
Sema ner mie gure give beter perfraee Uh iy

A shecstr wih nlm lange change of esto: with temper
ue, [2 wie to regulate the gain ef the reps ard gmap anne
Tha Cetmaoe element ic ny polot of temsondueling ones stich ie
quipped dh ee wine, gs eming and an inate ester TH
‘sholenssemblage, which ie Heag han a tenth of a tis nmr, fe
foveal wit a bright galdeostzg aad eae is wa weasels ube
te muluce Beat loses A petork consti of Vhermisor ese aad ta
‘see wauad resins sd lalemnce onthe basi of precio measure
rents the livia termite aad heater, sna i the ween
fa serve 65 a coutacles taenbostat for lhe power sensitive theron
Ile sa tha tne vsetnce of the laser ia woly under the eonl f
Union corns. The thermostat newt alan serves hvala he
pele to slandsed characteris, thus avoid impesclicae ele toe
vets on he bace dies wal es! Inalment procestes duty man
4260 oer, sete raeusueas Joost, Ara 1951

clare, The cosletetheristoriltrated in Fig. 6 bas less then one
‘hil tie volume of the corespancingUnerminor use ia che enver K2
‘atic system abd as a enult of en reaemen's wil operate om Test

Fuxeas ase Fquscumas

Flier and scuntver seers raped in any sytem uruaiy exe the
longest ajaaata ere a they vary omsiorabln se due to tho dit-
feyenos i he type ad aaraber creat components nee to provi
‘hedesiteeperormencescaceratcs Aithough sabe components shin.
the disustas of thew asembliee erepoadingy, they ar sil ncampat-
‘he wid the cmensors of other apparatas fers, wns dei aller
Study of he diferent eck coadgurations sot chet elke eel
forthe Nel System, to divide up tho mace complied nebrors for 38
sel camamne rerstose sverme an

emi into overlie which could be connected together in the eqi-
rest ascembzs, The mote complicated fers aud ates thos are com
ris of tro of mote auch unite. Except forthe sigalg Fequenry Titer
Ther nemo fora ites and oginers in ke ape ave the me
Teasing art he sme mont cles, T's division of tere ard ogee
Ja ints vombinatinny of exteally ideas unite permits more eficent

vow of sane neque seems and fe inesamontl in wet manufac:
Caring cts Ty wilalion af eons ase tas

‘apt sembly etic of aaa stun shield eas equ
swith mocoting fags wow cage Loe Srameantk romps Iw srk
{heal end pines eld gether Ip four earner mide sic bu serve a
fou othe vekt avaiable tssinl i Ce eal se ee plate Ty the
‘etter Secvensy tte, eo delat ype inductors one on enon
Ftenlc cere tbe are hes n leer iy means of Keyed recess inte ent
plates. A threaded inset in a of the end ples sapporia tse magnetic