BSTJ 30: 4. October 1951: The TD-2 Microwave Radio Relay System. (Roetken, A.A.; Smith, K.D.; Friis, R.W.)

21.8 MB·English

‘The TD-2 Microwave Radio Kelay System

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USeatncgaots stow at a ies metic we

1. Ternonvemont

UPERAIIGH or mica fequenses began. to astaet ie interest of
fonmnucaton rescav engimrs during the ae 80s. The pete
syplcatin a coases to commensal coneuaieativn eutsne delaye
Yh outbreak of Wore War Ul the iowa techniques whe nl
ley een developed were rey advantage i the peosecton of
the eae, The conemteated develaoen wllrt asl rinse prouction af
nits sujet fr mieay application gray espabdes the eng
teen Knowledge and prodetion ski Chis rive ow comeenicn
tions Gok. Altes termi of thew, it as possble ain to eevate he
necrsury development efor ‘awa! sopcation of microwave techni
to cornmeral purposs, Inthe Bell Syssan thi elt waa apled 29 the
CGevelpmeat atl constacion of Tag hau! eno zelsy system
"A broaden ltrs nel ola tea syste now cover rg ans a
‘he sain cosannenton verter of the Cuited States, 2s shown n FR
reomsente the combi efforts 4 Bel Syste ter vine 1918: This
Gisino! eatore raring husceedsef mesenger lv pletane
foncach broad bona gibt 25 fo ile strtenacroas he count,
Isapenml ep 2 new ead, Theta lay wae che evelopaene of a9
xperienta sytets placed in servine in Never 147 betwcea New
‘York! Pron? Una the ects compltin this projet objectives
evr estblived for a eyter,whiey alle! the TD-? Radio System,
ple of exteason to at lene WO ales wil paid of 125 reenter
The TD-2 Kao System provides no new types af sere nt wil sup
plement existing tastes auch af the coexi! rystem. Theteore, TD2
oust provide comparable relly, cconomy and quality of service Ts
M2 mu you Sistex Tecra: JouRKAL, aeTORER 1951
ro miesowave ae Kota estat 01s

‘sontenplted that by tacend of 285 thet willbe ever 20009 bros Lad

‘hanna miles of radio ein operant el Ste. OF as, ast
two-cird wll be us for televvon sree ule thi prsice oer
an00 ‘of ephone cre

TL 12 Sessa teer i:

A selio relay system designed ot long stances nutes say pens
tote but not nee to long disneirs emite Tae problems are
(hey hae of eystems engineering t9

aa =e
“Tes
“t “ESS
ot Se

‘

eo te anay repeaters tande To nse ssisfstor ystems ope
tinny the incon chaaacterstiee mist rerun stable ave long perils
1 ine to pert urattened oper A rahe ower pla so ah alan
Stent ae wena pats ofthe radio sper.

A, Bevriptins
‘Tee TH 2 Rais Seaters wifey fuga tneltion ane prods
tees braubtnd eianrale, ec im each direction, se ll mueyen

hurtin se Sil-1200 regacyee common cenrier hire A eevee
fi sas ie sown it ig. 2 end syste bloce diagram ia Fig. 3. Toa
Draadkend hommes in ope Wrest pmniae a Exo way message
1 SYSTEM TECUBICAL JOURNAL, OCTOMEE 195%

owt

“yee sam Acta
system having « eapaity of hubs of ke mesznge cei, Alternately
ch of these bron! hard channcls ease uscd to prove n dmexoeyee
‘eo cut of the kind equiced for preset ay Bick and white teeison
fr they aay e used 9 pie er bultlsision czas ite nee
ie such souls develops,‘ video or mene int to ane! se
ceetey stollaed on Hbmegayele career, enslated to eke met
Weave band aniplfed trie wu Lic nowave ousput of etber
SSeane’s in the sime retin. The vn outpue is erred through 3
Single wovegice tn dictive transiting strana! far Leu the

ent eation, Ata matt poit the sechannel signa isrweives mange
Aveensa, separ! I seeana of chenne, seperation relnorks, ahd et
{lannel converted toa TOanegseyele LF bare or mpivaion. Aa throat
opener ort this Tornepacgle TF signal aguie mate he 00m

1 mere ate stn Baa
ee eeqereenrs -

cle carrey, sample asd to tae otker canna the ame ico
fel delvered to the tnssitigg antenna, ‘These aze the simpines fe
tions performel by the aue-way ano tepeser of 96 11-2 pte

onde ie stata vdeo of # mukichannel carer gal ino a
1D"? alo Sten, a nengdne transmitter ei Feeney
‘Rovalate these rigs amid a center seuercy of 10 Bogaeyles, This
it is known 86 the FM terra! ieunter Likswise, at & ccering
Fiat ao “atesmedinte wosiver i regan ty svat. the TOmegaeyce
‘Spal back tos den or easier syste sg, This unit ie now es the
TPM exminal river.

‘perspective of the system maybe lana fon typi vote section
sown in Fig 4, long syst ie booket into aeetion by aeeane of main
epeter ations every fw hured sks. Ausiary ston interconnect,
1016 re mene erstua nuewens wuIKst, demHOH 19ST

‘he in sation Poa opting standpoint, main stations le rot
suai tts pinay in that exch hanel termite IF tl
Ingesrite This pennts thermal a earl for maintenance, the
Feplicement of sess whi sll hy wa eeu, by pati OF
Fervoteconinol othe IP switching cate, A slarm centr mayne
‘elie is Fig ae aa attended efce £0 wich a mavimum of Tele
‘etait latina are onaeste iy nize ato far the pure of rept
‘oraal conditions that exist, Maino persone! are gute to
luettees stacons fom tae point, ot all TD-2 uit ave ried and
Insite atthe aio stacon,Mintenonce center ertabshel soa
{he rote to sensor these nite wich rire mae lore et Julies
than ate povided ot she satone, The equi he forishog af eaten
sa unite ae the inv cept stale

sels vate prseate dean new problems in pla’ engineering Peele
{ hunlss w oattais sop ites to eta Une of ih ten ai Te
lest salu alle nlc eye eerceahle toon and power Ham, tes
{Vo portsesimsle ter teins ad eich are an sb lance
MT Mhese sad wes ets yes a 3¢w catlenge 20 che pom ergnersing
Foose! bey Uc sexe acco ence ret hy nets stad of topo
sari and 09d nap, inept of site rete al Falls the ease
dots of te ume lore af th

The canstrortion of nce steer: hdr Soe high 3 vulval net
Lhinkirg hy tt Illy cnginoseat Te e7pe of stecctare ned ve the
[Nev Ver ays wetan athe TD-2 System wes somesha: influenced
by tos avalaihty of materials dating 1918 gee 1949 Conere stricta
ere need forthe ty Liege ae in Hig Swit steel owe
$ppecring om the fab Sr rewound, Whete steel towers ate
i comveatoral type stl $28 Dupe a0 tho vs ual nae
fel eap orvnt aaa Fig & Double sstenna decks ate provi
Towers li el sade toutes are rogue:

A, The Ramo Romer

A. Repeater tinea
“The design ofthe Th.2 miennwsve myer fils nine tht of
telersne fa the SowYorklestoy sytem.” Rapid avaucumer i ce

flvelooment of irewase oui Ins alr reper components
‘hs the petod oem 1945 To 194 lel lo x meena “pmetiea ut 22
ever cmponents or the TLD 2 System, The zebeation In Ete 1947 of

108 rae neue seeraa nuceaL JOURNAL, O:TOBER 1951
‘oD vorrowase eanio matay sesmix m9

praia trode arp for mieraoave apliacon’ was instrumental in
Motes ining a acter for rede, for it suggssed the posit of eel
sirpliiyiy Eeseeater tle at the sara ane pevvding wider ansision
Tnudecitte st greatly Prove ficiency. By replcing the high valle
Betia (vlocey vacation yu wpe ofthe ely repent wit the
sk ogee bec pct to design tho ayster ne haar
operation. ev imperial sap tan inctensing the Mer welaly
{2 removed regi rete tale fers the vlnerble potion of he
yvctn ane edmiented the plan ofits durvg stchover from orm
tpevcaltostandhy primary power Inthe TD-2 Syste, wc tbe ters
toe goneclly operied from 1-clt battery theeigh droping esha

them siovimating cnscant neler ower operation to increase te
Vien seca.

1, Hepower Desi

Ablbck igaa ofa TD-2repewerishwn ik Fig 3. An incoming ism
conve sisal tnt ceeiing entewa fev! y a shannel partion
retro shows iv ig 7. Tae el then oombined in the reonver mine
vor aren em a beating eel reser provideas intermediate
Feeyenny sige centered at Himegvevels. Awe icain, delay ecual-
ienton salsa’ const te pee athe iscemadice freuen
line cat esiver, Tn the tranmiie use gral is combine in te ans
fuller uindulacar with 1 lenonave souese tw provize as it 40
Scgacyels fom tre ceived requener band. This sign one aad
fenrbined bri teaarviter elaazel separation elie ei Signal
Ws uy mn. sate

fom otter chonnels for tmarsmiction
{Sgn srw en, Ts dag
cele IL Fo vent rai
Irequesies i rtradosl inde Us aust
Aneel cesta tern Hei

‘sino aur sao reseaters RE
foe tae tli cet 2 Bs sa
rmowstersinply re eivess pe ale sl
Penal, urobieearal raiteiest,
fuce for the wenebitts: and .eziver
togete with tah ¢megaeycte a ie
reste neyo aoney tity
txncy sitions «ore, which ie ceseodert
nly go omit oe oven n
the sepenters of = main stasion since eich

Irouepmist flier srtinn ori
tating purpears "Here it 1 necceny t=
prove anirdepsedentccilasar source for
ach mocuaten prose. Ip atsh an
‘axgenan, crete it eequcee add throug
ful Cre spans aad, Cciehse, ie wll
tel staal teguinans ts or tes iis
ave severe Tp "he TD-2 Systen ie re-
(quency sblity is ebscned by the ase of
{erste sont lo: agelhone a Eamon
fenton Tosa reac vrai

Weil aryeratane elle oy ae
Use nea apuatr ay at mat ations,
oie ie ane gots ac A
foes wed wl ier wa ane
Sea nee siny abr repeater.
ng ter yea eva ha

luge fare alin f4 Pigs 8 The
top al of the boy sensing oh cams
ents whi sorprie she signa ah
‘through tkesepenter. Tees are tl lan
sepnnon fle jn-e euppsession i

sriacat yormext, nerowER 1981

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