BSTJ 50: 7. September 1971: TH-3 Microwave Radio System: System Considerations . (Jansen, R.M.; Prime, R.C.)

14.4 MB·English

PRINCETON, N. J.
THE BELL SYSTEM

TECHNICAL JOURNAL

TH- Microwave Radio System:

System Considerations

By RM. JANSUN and R. C. PRIME,

‘Mvowerit wisest Meszary 29, 190)

This paper piesa genset desert oiow of the TH Longe wicrawoue
ey the GH conte carver hard, Pere

ie ulate

foots objectives ove
rattan te dealoped. Particular tention 0
ln iteration nots an! tertiary anterferenec, Tw coches, de
relied performance i om pared ith nensurewente wea ms the igh

‘The THES mierowsve vaio relay aystem is ¢ new long-beul Hui
fesiges to provide tom co state ecuiomest wih aupeoved per
fost fer woe [1e8 Ge aval. When wosk began on the proj
fn 1660, most of the Dell Systeay ean trafic wan eatin che
FGHa'TD-2 seetixs, Also, ct that sce she feet TD.3' ral tours
‘ioe bring installed, siase LH-# aoutes en be ial mas owaoune
weal ae ap “overbulf" en existing TD-2 ard TD-2 (TD radio}
soules jt ws clear that TH-A must Be compat with TD-2 end us
Sov se the new TD-2 ae pessbe, The fescue of TH-8 which
Ufenntinte i From its predecessor ip the 6 CH band, the TH-L
2085 Ta my sroneae nacatmoaL suemit, SPREE Tt

zedio system? and make it more Tike TD radio ave te invidual
francwilierresiver lays ond Ile 70 MB TP. The Taller inerouee
‘contin difeues with interehannel ivenfereace bt allows THT to
tee the PM termins I svitelung systenns, and vome of the Tiree
developed fr TLS. his, by adopting *be 70 Mls Li, a combines
"TD in TH-8 feeiity wilt. crosbanc protection anieehing Looe
feo a ee tie

‘Aithoog’ ‘TIS was origically conceived n= 4 Tong-huul, multi
haniet lem with 40Q0-mils capability, the need to adapt it to
Shorier rove wich a stzaller sree sacion of siveuite wae qziekly
ecogh ned Tae so-called madiucoshau, TI-3 then came anto being
Teieisuseed in lates stile thi Seae.*

‘Many of the design toknigues wbick were ssimilated doing the
‘TD. development were divetly ppleable te TII-3. Ths the dasieners
of THS has hnadetert with regard to available eineuit designs anc
to vnderstincing how sneror trenerssion pexformanen could he
sehioved, Howes, TH Hil Ici ignieant evans Uo he aot
radio twoeater design, Tn partitulr nleowave intron cer,
rniomwvave envelope decy oquniters, and sactns of prcventicg
faljent share Setacerctes lle AW ase oh are key leah
Mie THA repemer

‘Dos sorting ecsebilites sad anvsis to's that wore available a
the Her of the orajext meres vultwsle weet, For extuple, the
rompulerapetcted sranemisson roeasing set? was invaluable foe fe
proeie mictnurenenls n) empiide and delay cxtorion, "hooey
sling detorions to interinosulaion noise was eeeady salable!
fxd compiier progrins develoeal foe [Da weer ase Tntially to
determine the cstortion resiremenes, However, these pron ool
fil couveaieutly hale some commonly ceeuring dlsinrlone seh
fe fourth and higher-order evel weny davon), Aen iene
Slap in the TH development, « teziputer proyrict we wrt Ie
fon nes wathstaica!fecbnicaes® whick ghva the desenerssloqoate
tute ty ole asters etion ta interpedalticn wai.

“the cient chjee'ves for noise, tones, end reliability are eousstet
with te curren ell System jentves for lagna ais,

8 “Wace sitesi” noe of 42 dnd for @ {000-nste syste sing
eves of oof iranssnan, ‘he noise roy mere 49 58
Brn cucng fig, alter whi the ehonnel will bo switahed
tonal to poet shane
cvsrea eavermamartoss 2087

{ii} Sinsletone intererove af 83 ti mavimuon tw any vie
out of 29M oe C5 Aone) aptem earng anf en
trissinn Suertioe ests ha shun ha i Ghent
Prnor rain in © meseage circuit 38 eozstant te tone loss
Gisersie wen the tsia power ingrown, The rel ie that
the reyuinment for those bascburd tous whieh ineroe a
fore ith Fading is ~17 lin hen t26 nose an te eres
je 38 dllined uring » 108 fae). Usider ntmal eoniions
this comespures ts “ST HB engine

Sip 0) 0 paral per a fr a taotoyy 400S.RAle
is nsuit hy ovaten yorly ete

“The following alnlar dss: abeotives for TIE

fe) tae
{8} 10 MIs bea Me band

sao vceite por channel

is adequate ta trons 1800
Imesstee eieeate oi higaedaisition
Fwton vega of 9.25 a Renae ae vi mene inet
Jura 4 kdta to 85 31Ts fe waeh vaio chewed oe ae TF
aia etki rn 3 dagne pase
Aiderenee {ct brelman) hivacn thx va chenaela of @ proctio
fiehing aptinn, Thos abvatives prevent hiss on dita tran
Iriston distant LY bon the vgn! Unsere
etinecn cozulur al poetertan channel. To scet tie above
poms objective, the alaulate ey all maha chara fv
Cnitehing seeing ast Be aq. so wihin 1 m, whe
fescona ih fort of AY eae
fig) TF IO Opwention Fempenice Rava Tu lngetal reo
atin che comperstae ish visi wt he THE 2ado bess
willbe tosinsinel wit Cw Tinie, Ata safeguard against
Tees of semperature cout, the ssstem souls unin 10
gwaate with ile Soyrastion at ambiers temperatures be
freee °F and 120°P. The Inter emperstune venge epee
Fiat the operating tenner range far rst hast TH,

esis the nelual TER hase. tho component ofthe TH ate) TD
sostems at olmowe Mant, Figite Tis s Mla dageats of 2 TIE
syste, The sinber and squgieo nf dhe sions enmpenents in the
cansnisson pt of ele system haa a stsedes eect on the
Terfornaner. Thaneore to make syste enleatins, a system model
Js eunstnictd which 2 the best Fudement wf Tie desiguers would
2088 ome Hons sin TEOMTENE suRaL, SETINUER Tt
10 opxorormamions 2089

represpat the wing] TH-3 agate. "Toe peincpe sumptions madein
the modst were based on th enudtions wietng in te Fle

(60) 150 tops. 4000 mie
2) 1 main stations il HP ssihing, an 10 rer tations
3) 17 of the SL ewitehing ain naira lave LXE

terminals ‘Thess stations oalod terminal main stations, tare
by necewty WAI lesnisae ad site ie enteence Ens, “Lhe
the mode! 000 rik yer i divide foto 1G paste nd tan
fie assumes tu be conorted at the esl, fou, oF super
soup vel

te pet les of moi hap 8158-2 AP from the bows
feet moves ns ae THIs} UI bey to the reoiver test ton

(hve Tomtiens ef tse aotes peieos ia the TA bar aco
lar the tolling ale"

During the ewurse wf the devotopent cho AL ABne alocatad <0 chy

Tote spoten. bas d'vhlal be mre the stom anions fa sera

Al-vnt aye, The Ea lout‘ ahows iu Big. 2

0 Mbps

AMIR mstensnwyp wlliph aul LMES2 aniplex sermil
vide the 18UDenessnge ole Inu. "The Imerhased gual tend
Frou Sbt ls to 8321 Ms

sua Wee Line Batrons 1

The 84 enter Bek was exseibes fm Ref 1, Sines Cou, iting
the Fak fue Soon “mpreved te hae 1800 creme. Als, the nasi
Teneth of thocnsaner bine hee heen iesetetd fo cgi wos by smote
fngan icerineiave pear

aa Fat Pesminale
Before (eau of the 4 EMC snnneniteen, 38 AP Tal oe
noeatos in Piston 2AM tonsestee-4A FM aoecver a, The
20 Tre seu avrine THeaToay JouUNAL, seen ETL

48M terse” ase proved wine performaney and sinteen pais
ane alieated nly 29 ene

1s Ponttion Seithing

‘Moe 2004 protesion eviehing sysben poles the PM tansinals
snd WLELe but neva ne ddionté o THA. Tho twelve marking
fhanaele may oe eivided petweon D2, TDs, an THA systems
fund the single proseton elamael i provided with swe pods Lo
trates ite twauetsation levee to those of tho spatom i 3 peoectng
Tho 100A protien swithing eyster protects three hape on ie
veri, -llhewght Ietahon swltening sections are rat uncommon
Minor tsceatinne wore wade io dhe 1008 eystem to edapt 32 #0
‘PH ws expe 1a Section 4

sa TH Poth ast Aes Bos
The terminal sain sions bove we TP patch an access by. This
Dey’ i eormion #0 all overuyne wiy syns i> th sation hich
Pave 4 7 Mx TF to tepieal lay saves, the TP uruuks ‘rom
several TH-8, 7-2, ard TD-3 rasta snes wll fen isto cho LP pave
fod avcoss hay were tall be aasigzad to FOL ternal equ
ther) wii one af several WA. otersion seeing spetems co, i tke
diel, roused ho oalesing rae inc. The purpose
Of she say fate prove an ey treats be Paxeegn LF teank and to
fuse 4 rower Incaior 1 csi all the TF ens inthe station,
IE tronks sucsing PW along! asaugh sho patch bay aad
There ncsemny. suneretiges ase made to the cely!sion e202 ng
fencer through ae UML tend acl spe'<T WORT

2.0 Adan Sptoe

‘The Cx when ays: mey ail be wees with TH, act the Beye
ict raw wurime nnd. The Fo ean nee zagzed cietal godine
fod as the poten x7 sonia semis the wcter seedings on the
Tele bags,

‘Mas: of Die oubsyateme whiee compose TLL8 ae oporned rom

Devel pene plu Hive hots fe a ned for + 1AOW and 24
fn some alum nud svilebing vies, Ta parteulo, bol) —24V ant
124 lance ser ued wih the 1ODA croleetion switahing syatam,
DOcher aukepetems neeiig | TAOW onal 20 nay be supplied ro
the ZV eupoly hy wars af deto-de converte
vszae eossunrneninne 2001

as Ratio Line

"The rudy Tins is Wak pant of the system from the frst migowave
race transtniter to the let sucha eevee ieliter. Phase inolades
fll of the ip T-R base an tke ance spate, Ab, sli eon
Sicering the tote wae elleation fa ao sao Line, interfere pike
fof the air by she reeiving antennas mt Lk nso meeoun. The
tise allestions for the vvlio Tae av shown in Pig. 3 snd ae
seca Below

© Co-chanwa inerfeere 6 te sagee g tor EE and ows oo
deat ith sade

(6) Tatorayton toteirvre he een ineluced boeause of the hi
teago ef the W GBda tad, The lastname nedee a8
felianedSntsforeces

{8 RP ean te antorna sate wore alla eal 6 Brac
pot op. Phe allocation is ev eeiles etalintio as result of the
knenen inypronemnent. program which wis starts ie 1984
This fort sr divest tin y ae rosing ekees de to male

(G0) ehver so J coma wore ylvon entialy the same leeston
eri TDS.

ey Tearp mre wt wie fo the ieee PR Bays 70
lac thf Vv Bllovgg swetins,

HARA ASERETE FHA THE HR
4 Genero

“The Fost ste nosing the spsiam was bs cone He se
aes. Fe TF, a psobae, an bie, the TTY eg as ourded
‘Toe actos favalvel in the seein moiking proerss are inetd
the following serge

1s, Nae lation for Tin
202 ue saLa averune reemsToaL soURNA, SROTOIEEA. Ln?

aaa RPC
‘The TH system was designe initially to porate on siteen chan

fae! anipemente

rel foquencice. ‘These Sheplensee ate content i te "TH-L
channel tssigamestet beeanee of the obvious neeé to coordinste with
STH and aes users of le 8 CH conn crovier bal * However

the TH-1 ouainy chun! iroqucssie ane nos used since for mas!
long-asol applications 4 Hs susilary cancels wil be availble foe
fonder wis, sshingy ail glare junaes. Taisen the PH-3 delay
Inet the te for THA un Ue suealndskvazeredSreaueneios Chih
tre incerlowve with the CCT reeonamensdea freeweneea) ae seo08=
nis, avd the design was aiaesto 4 sino terme leaned
eases, The» spelen wT ese nt oes where
ie aevceeary bp rouotiraye wish wirie sealy poring on he
jegered “ques pon Bu. Ihe A fray pune ae shown i
ig 4. Tho use of che stoxgered “raqueuvee is wot wihect some
finadventogs, Chavos) 286 etn he sessed in the comtean
orien base ea? consequently the route may grew te on seven
inst eight enlio ssuaes Tei sama orsslaon Ut Hef
Fatal 208 ch, huge with 18S, fe uit for wher
shane: the erent ha thie wher shanti Bode, Caforsanatey a
‘nel want a? wale ye Foe ule enn Ings uF A88 wl MS be
fs toy eae sme keg Teun al Ue aa ae

Ferezee weal be isaerchie

ae Aerowoe Carver Paguaosiee
All of ti mieroware cares froquenses is TIL uce asnereted
osiow the RI igsal Feqney nbs notin we Unk Ue aoi t=
bi peoblema with the lower videbund useonvertr, Wits ths gwen
sieromave exiver caramgeciont iy rae eumputed that the IP seloe-
tivity was salogonts so provunt image Sn creme Ire al ue
‘the comson calor boss Anothtr amiter -ceuirng wltvtign 9s Sie
tl <0 aisle eompanests eficently #0 thet petra immogeinter=
roses at igh lowe gevoacer sarices wonld abe be eanaed by KF
Teakage levers ays

AOE peed th aan sete sade ine td tie
cif om ia tw TB fy hte canes eee TR to RE fe the auelee
Siar tad HF Ua FW ite ties smd
sven ommmariss 2009

aa Se ae ae
so lag = wae

~~ os

ie, TTS rp aed sce fogchoy gon igh eatin)

‘Tin sland arta sequence for tl engular ehannele is 479 ST,
27, G7, BT, FE, PT, 5T. The seyunes ie the sane 9 for TH, Ae wo
‘lnsen feat the prefer! ner of growth for TA] isthe reeerse
OT Hat for THCL ated therfuw roaliels with shoréhaul system rt
mnore sel toe peered, The rvs chame's are on one poleseation,
with "FP nearest the atten, on (heel ehanrele are on the
ihre poltization wth chewed 87 newest che askeosa, Four antexnse
fs tenuived ta aepeatersletion, and cach anienna je eunreote
feclusivey co eihen mevivers np trainers, Nensually eaaonels ST
hw IT il be the qroterlign camels, altzeugh ary’ tvs €
Fan be ues If tte taggenel feeoueney hve sae,
rows sequvnoe wil be TS, 8, 88, 7,28, 68, 48 The even channels
fre esqinped last because ere ee shan! $8

i Seynence uf sin

Tika £1 or for 17 oe ae
2084 ann wis, AYSTR HEAT SOMA, SRNR WL

4414 Suiehing Syste Pacunatern

‘The oviginal 100A designed for TD ayateme ee proteetion pilot
ALT MHly unl e noise mujtoring «lot wt 9 MLLz. Both of theca fee-
‘quences were change! in TH} hecaute the TH-3 bassanal extol
lo 10 NIH, The woiee elas wan moved cw 102 ME to be ubuve the
Spa ut wel, Indow 107 MHL (ae which wil be prseene om set
‘TIES channels, The proceetien plot was planed at 1138 Ml, ell
hove t3e zane, Tis poe tremeney wee chown a thet “he eeran=
fndoteidebcnde of the pilet would fell netcina dy etwees. the ean,
fxd find mustegretas on the acjucere esannele, Homer, he le
fof tho eicemvs te es fiat it should not mettas san dean 0
fell iuto mastergroup 2 oF 3

ue Maula Pocainetere

In tho prclininary enlelutions of themal noize it was essumed
thst TUL would use che same peak frequency deviation as TD.
[Egpecienco withthe ystems hor shown wa reson a cheng Leo
ter

fever ney hour spect Jos prestcee an rns foecuaney
on of 7S kllz ex the por eirait rs requeney deviation fe 178
I Hell Syrter tervinaogy the equivaleet eine wave poste
lespicined in Ref, 18 ofthe {8i-rceseage eit fad is 427.6 dBm,

Ty TD peciplesis tans Fhe def Re, Tess wilely tee. 3
‘TD-2 saw shut the tooweity ut chut system hs been expanded 10
900 snd 120) mceeage events, The same ebarneteristic wan chnern
for 111-4 to smplity the 2008 pesteetion tunes, (The preemie
fed do-emphars networcs are located wichin tho 2004 emtehingeyae
fem, and « particular 2003 systema mish include 'D-2, TD, and
“THLE ehonnels within tho asi avsteking group) This pe-emaphasia
hase 3B aearcaye atthe top messuge circuit (3.524 Mile} reltive
Go Pie46 Mita nceronce (en emeenves) tems,

42 Pharsl Wosee
‘The oeation for the 150 microwave sennemiten and sseivers

som orally “water Cha sperified in Pig, Ase devel
Droziewsa He crane evident at ibe therail vase woul eer is
portion of the eliaation,yrineipally broans en optimise view hed

brew takin of the lees in wave networks and antonne eye
Reet came from tye directions Filly, the improved performance
fof the 41 PIT penmitted the buy alleeation 20 be raced to 384
‘Bemon, Secondly, the improvewencs inthe LF fits design mane po
sikie ty esse the sliration for termodlation noise, and as a