BSTJ 50: 7. September 1971: TH-3 Microwave Radio System: Microwave Transmitter and Receiver . (Hamori, A.; Jensen, R.M.)

9.2 MB·English

‘TH-3 Microwave Radio System:

Microwave ‘Transmitter and Rec

By A, HAMORI and I ML JENSEN
(ace essed Mera 187)

Ie features and performance of « O-GH travaniler ant recier are
Aeecrbed in this paper. Me syatom atectives of 41 ABrne) for $000 males
ft rivet lomo derive 2 the pein paper ave pal 10 the
tovign, Wil the exceplina vf he val toweling abe ta ep
cat ll ai eat

‘The microwave trsaamittor aul rvosivercorsitate the bese units of
fa mein avster. They ponvice she gain azesssary to compensete for
[be lcaeusaion lose of the staticztestation ai pat and. the
soleriity eeeuive® ta Koen the ratio cauoue.s propeey eepewe.
Sines mary af shew ties may be conaetes ia sazie, cath cast
eet cliagent Userinal noise, enoeeodnieion none, alerted
‘squairation requirsmetts im onGer to satinfy the overall syeen ob

‘All the cquipnont reqiced for teapemitting and reeciving ©
{requency-nedulaled 6GFe siya) is eantsined In one bay, ineluding
‘he ebsannel separate and coming tes as shorn in Fi. 1. The
radio bays gre mounted side-by-side with dee, wavexuide conmee-
‘ona at the tap of wich bythe wry wel (out WRe
158, With the esteption of the tcwvulingwave tube, all ieile are
lid ate; only a 24-velt upp is required for primary de power.

"Tro types of have, kin ston wad reponiny an rate, The main
station lng erteis infepeadert teanemiter asd receiver ute, The
eosos for (iis ie iuelratal Fig. 2. bv main etetion A the treme
tniter servee Tie WE destin whe tae roesiver in the aeme radio
buy serves KAW, Av tiem nung oF mgiatonave werk oh the
feaneiter re

fines lw une n? x pntactan chan! oy we WE,
DUR mp ance everest mpesTEAL JOUNMAL, saeraonie® IL

Gee Tehes
F* fron Sa

sauces
rosa 98) RRERIER aun

AFreeion without a

fe tie RAW sigection, Thi inmprorse the

fverall syotem reeblity unl wsnove rinceneaee robles. TH ase
wats rrvives on sraamattersly bye pestle. These buys wan
shen oe Fellysouipoed aha bart

“fs the repeat stations, however, he trenatter aru cecetee” 9°
sho ane np sive he auno dotior of Haramieses, Sve eve
fan aceaniage in idependence Eee, vom uf Lie eens taneons

sve cerned Lcding "04 shor sao by

‘A sporiel deezare uf the hay ie the wse of directional wavegide
filles for shane! sepacion win) cou binavier. The zac e Uvee
fillers vuily neineer the rnmaber 9: wavesaice ecxponeate tad
Glsincses thy nord foe Ayes or ivaalnm. Associated wth tho
Feeerowave flov'ng is enather new fv lve: niermwave delay quel
ation ‘The equlatio= of RUC Blers a RT 3 Tare accurate ne
Const cham she raconel LP equizabu

‘i mpdalatore rv us‘ilanowd Gage diede) aad wide ube exeape
‘tou uf Bits edjnetiene tes lain re “oning acysstmets. TWO
Tork access i gravid ip the nse of ser a liveeFonal Ber or
sivaulator

"Thee mitre ‘otegnetecccwuile are used im ouch nie by.
Witt she exuption of the madaliton, THVT, £ltere, mierowaer gow

itor and ne io} ull scree site ae reste Ue

aod iret, The rertribntce arealy ww Wie svupleiyy of the

dia bey
Aes is Zain el
amriee reauyly ted ia ule sielar systems. THs nporowh cox

std is inewnced ie pee of a

Chores comple mg impeos baby

‘he Iny een 3e equipaed wita eae upornl onmpeneats for a
nvquence inlesed ausily chanel wale leserbed i a later
oper

ig i ot oan ve
2100 uy wea werarun aunseay voce, S902 FT

1 AFbneoaee Praseniner
re black dingrum cf tke sigpsl pasion 2 the truism
fn Fig. 8. The inprs ea toquary-modulied 70-MITs dual et 7
AAR whic enswes Frwy ar FM teva tare or from a pe
fecding zai meses. hie signs ie apoliod to faa IF Tater spi=
fehiek removes eveenilly ull waglitacie moduli en Une ms
‘the tmaraite: modulate. ‘The limiter wnplider bus tnotker ou:pst
whica ls ues! 2y che njle itor unit The mecemitor enlator™
converts the TO-MILx IF signs! ino the teunemistee mucrontve sg
nal by modclecing che transmicter microwave ourcie: (TNC wes
sxalad by tie mleomave greretor ext accsinced cecaitry we coe
fevibeé Tater. The TMU power apatia co tae modslntor ie 118 di,

"Tim sure ine206 "vomivare noise in a name soe a0 SE BLL
Wher tht mole. apyreaniye Ie mise level correponding to <n open
ancl Cromtcml soe wn s@ Wy Hi fu! gelm af dhe eee)
fan ose! volage fx applied 2a the tromsnitler muna dike bin
[Atthianer operating [rant the eBsieaey of the mesllator e dosreweed
do cht the trawler outgel hops 29 ub, eulliaone Co provanc
acjarsnr ehancal ‘ateriecence, Tia squeleh fatietor aap procuces
Telay conse elgute, delayed ty 4 arcends, to indionte the operation
Of the ani for emoce obeaerstion, Tae dey i ntanded to adzinate
‘ye eation hich igh he associate. with normal fading satiety,
ave op fines ane 0" lt: dn

‘he trunemstter modular vutput passer through & portion o? the
riecoxine distrisulion miyork! whieh oma. am iolatar 'y the
Sgnal pat before & eoureits ta fe susbrler snieromave eebwork
Stee the TLL microwave surcce e alway loewced 70 lls Below
the signs, the czeui tunction of thiv networks lo ps che sper
Slshardl othe medsiator etd velo the lower adelaide all other
Shurione ontonrs, Lsia zatwock contrane ha? 239 tas taaoamicr
faletines. The not aecive eect ig tz sigod pact ie the TWP
Shorv ye PWT oan eoatebe tn she repeatr irtarten by cenaring,
Taplituce sunllaon int eve metals, voy ira 0

Seine ea pr cnc ce gl Fee
SEP URI Couto aie Mladars leet
sagas an ance 221

imines #°Vsontees of ADM froma he sual? "The signal pte this
nist 'aq regliginte ABE because of the Hinitar ard the inepaiionn
Vonks af che wansite” nleln or. The Bandpses Slke-* hu-
tour, Iam vsly Arriah Gao: inline AYE inte ths eal.
"To clonoa nH, tl dlay cistron 6° the tanemiter mierownre
Srhatie is saad by oan Rb blag roualars whick fe factory
vel

‘The TW inpt-acuwork oe 4 witewaee fntegrata iro whieh
pevlirns a srien of fimetioue. Mist proves a aned masta forse
Framanister wieuwave network ty cee ul om ila. [ala con
laine en atteatar fur e lng, 'e pt gover of the TWT to ~7
Bim, This tenuatcr coms’ 6° a cimolatar wie ots axe yw
Iooninated in em adjustnble swan irh end an exerraal suvowids
leyvina ion, Tae istnien Ines 0 ne wlencalor te the return lace
tule caljascble tara, Wh He extemal teminaion erence
ford to mismacet l-ninatel, oe Havaineee Tacealetor tpt
invilale at that pert fr esing, Fal y, Lhe signa! levee tke network.
thoual # roluceleseght were pore wih mates wtb ema
Sayul gout wi the TWT, A. buen delerlu nerces an 2 meaitor for
the cameniter malubeor nts and is tanned by Un hey ete
ie srl
2202 am nena svete anearvtedt sem, SAPS 71

‘The sewvuling ways tao iw peso, Reena packaged cube
‘The tube ovtnut Bs w nemine! 340.5 Bm with « siniwun gait of
BRE AB. Tae ule '3 Well. conalant gin by sejuatng tho asi
Dovtage Shove Hs aynehonmass alae. hie merating paint provides
Tawar Pert) nyu i lest AMeluePM orvvtson Hou af Tae ie
syece oporated c+ marin gui, ws syrchroouus voles. The tars
rusien ebpe, bowover, is ant Ht, Ihe [soar slope omponent i
typieclly ~001 aB/Mlie. This ie eclerchle since Inear slope does
{nk movil th esgssnevdlasion snertion® ‘The pezeholie and
fie epee ate ght hat te Say Saal would be iveled $3
Tautsaing Hs Unpsiicion saspe wauld ‘parse tho faezmal edke
ions then i sla ines she age “nonmleton. Canaeneenti, the
cal, impedance ef thy Labe is melee: Dy a tuner ie Le ENT
Chulgw sverk tn rosie enon stg pee. Thy alr ese
siren ler

The TIT pose” supp's? ie 8 de-ode eosvevter uperusing frou
the Bievul: eapely Th pavembioe wT Uke suthagee nae yr Hee
tbs, The cube voller current ie aumllune! ssternally os the bey
ereving paral

‘The THT crspat network’ br mene intgoueed eine ater
lw HecTWPP inpat network; 3 etommn the ane fonetioss th“
recat of privlirg attenuation and ter. eset, Allein on
pee ter in she nietwor fy used to snopes harmonic of the ontput
Up ne eu 30 IR, The nye ctx ala onane te Bowes
iter boone i pet ul sheen hing, ni eorve eo nein,
there Tho expat power tnaitos 9 stnected to hath the meter aaa
slam peels Lue gine al aac ami,

he (ee totter pork in soe jl when: eo highe
ever aticnuator van be wltecked ser tol supees, This to He pint
‘ehrae the autpat power ie TO mace | 140 dino, The egal then enters
the enn consbining ter? Ths ea deena sitar eosaisting of
a veamolemen'ary benipass ane kardstap filer. The owpt signal
Pacts tag the stloase selon lbts enooualating Le Ral vl
ivy: equinal iv de Suncmitien, The other sadio-ehanre signee
fms throu Uke ards seclins ily a tye he FR 2nd
ombine rich the buy watp x hs eormun apa ut Tae voramon
foninue port poseen’s a goed sons la eal Toquenete nem
the whore erin and ae ena be eomaeeter im tances with uther
simile Titers tured ty olie~ sas slave or comet! ly lhe
spteraa aysten. The delay dicurtion of vhess Utes is eouelized in
the aazveeding ceoevers,
‘nossa 989 AEERIVER is

2 Afiorncase Revwitr

“Wun slaves te bck diagram of the seeiver. ‘The signal ents
le reviver from: ae anteena warnevite a from the proeedig bay
eons: the ehwnol eeparating actvecl.’ hie network conse of
ttirsetional flier, sila tothe clare eombining ler, and a ware-
fzide clay susiner, This iter kus more selectivity than che ene
in the trans oe to paotet the reeiver Irom isarference caused by
bor channel. The delay equsliner tix the delay ehape of bth
he ebuncel xeparating Alice sa the proveng tranemitter chenael
combining files. The equlizer F azcaced withthe channel seat
ing filter hossuse this flr bee ahout eign az mach delay sbepe ns
the hanael esbining Aker. The test rovtes port (@ remevable
‘wavugidh mvt) Je the reformer poirt where the seceive sizml
over on = aoninal leg path ie —28 dBi,

The reciver madulaos! eosives the izput signal ehrovgh an
isolator aod another dzeetonil Mlle=* ‘The purpose of fis filter
fo combine Uw reeived signal gd Ie seelser microwave eartie.
"The very narcow bandpass filter is lve to the RIC, thus sprees
fg the noice idcbunls ant other epee signals The complementary
pandereject Alter in the egnal peta ertenuetce Ue RMIC bul dove
‘ob interfere wi th eesivedeigaal, The reeiver adulhcue eomsers

ff Bae | ss lm men es
o) wee
fam __

ig, |-Mrersve rier Bk sar.
2124 sy anu evArR SEOMSCAL JOURNAL,

the mica signa inte a 70-MHe UY signal. ‘The maerersve tage
signet 2 30 Me oe he is gh quate Tae mod
Tnlor te ebsucbed hy the ‘salar aber 0° the filler, To eeLeve a
Tow woe dure, the motulater uses Gas Seholsky bussir dic
‘The TUM untprt of the low-noise preanphfon ix —13 Bon with
the sins) RF spat sod vacies withthe recived szaal puwer, The
IP bandpase fiver’ that follows the preamphiior provides eddtionel
fuettivity st the adjacent ebeanel Srequeneies wl at the IE har-
mmoring. Two filter designe cre availble for chis papese, the 1014A
Fer Ter segue woe ad te T0089 filler whieh hae weseterseletivie
ts fhe adhucens ctanncle Tae lator Alter centaibuse more to iaior-
moda wise ene 12 Wel wy when “he signaltoalerrt
iaarcbsigoarabg ie Ie [aw 22-6. ste lay input Te may
becur when both chentele are on the smo polétiektion ot on oon
verging routes,

"Vine TF lay sian rstaes the cela ehape of ehanzel separat-
ing aul combining necnorks of her channels orate between thie
acho bay aod the antevis The delay elope equaliser ie Bel srlsled
after overal ayer meamueeenls sve own prone. Thin eal
inee ie svalable with fe dierent slopes main, frm 05 40
“04 ny bills

‘The TR rain amplifer® oporutss at « nomical 22D goin with
10-6Rim outont, ‘Te buslein AGC envi votes the guia to fellow
S0a1K Sales or IN4IB uptedas withont output power reriation. ‘The
‘iferencal absolute delay bovween tae zalio ehunaele em the same
te cam be equated by the wie of appsuocate Tenge uf IF eable at
the outout of che TF main amnlifien, A pod tlds out the euble Loss
ta obtain —7-lBin TF outa,

a sasee Carter Bisson

Dod tie microwtys miciver a! Stausnitter modulator nase
lovally-evercted nierowaveeaeree, The THA frequorey plum plscee
the mocsver an trite tryocroios 2520 WH mpi wy
toioes ta easier te alg’s 10 MH below Ue sig. Ax explant
tarlir x eoniunelion with Py, 2, the main station aaniene and
Teecivers operate independently snd thenskom require independent
Iniewivave ariay gevonatars, Iv the repeaters, however, a single
Iniecowave geneotor js shared boowcen the teenemitler ema receiver
of she suaue buy, Beene of thexesienenese the oro tyes of bay
Srodlsenssu wopssitly,
smascntrren AND MRO a5

at Repeater Boy

‘The speater bay iinnnsave dstibucion eens i obo in Fig 6
“The mierowave generate” i eryrtal-portolled ab about 125 METe
sud prosncee « nominal LGH ontnat ae 120 dm, ‘his onal i
‘ivltiplieg by the &GHs vararor raukiplicr* to obtain the dered
onstritter mnioromave eon feequeney. The microwave eueier Slvr
tecked “othe output of rhe ruinier 3 2equirec dor removing
npventod 300 a IOND-MéLlaeicesnels around che TMC waist are
trverated es harmonies oF {se ‘ower iveney portions ete multe
per einin

"The output of the misrowve eavier illor may pe shrough the
towiliary hone) sedulstor which plseonodsles the TMC os
Aeseribed inn follow’ pape”

The reciver woremave carrie unis. be wlsinal from tho TMC
singe theee ie only we miconers gexerstr in reper ay. The
feieney difrrren eueen tLe TAIC ape RMIC ic 252.01 MB (Ue
difezenee between the trasmister ung ereever sgaale). Whether the
TTMO or the RMC ic higher depends on the bay being a low-high oF
Iighcinw revester ‘Thi irequeney shift is aeeomplicied by «sbi

modulator

Sb eres

sini f cee
a

J Stee

2, eee Flca

ig SMisoosss cari btn (opal bo,
2128 ne wen averox OMEN. JOURNAL, STEERER 71

‘The distribusion of che TMC ts performed by the miowsve se
tuition nouns ‘The TMC tar the teanemicer modular ix
‘adjuied or +18 GB, and the omalning earrine power fs appt
to the shift modultor. Deth the tranemitter and bide moduletar ane
single-diede modulators whieh regu w vireulnlor to eepaewte the
Ticronave input and output signals Ix addition, other sieulators
fry eel ition Ho prove waletion bee thw trensniti a
SHR neditatne wid to tarninale tho unwanted sidebascs odo
Imodulstrs rubseled rm Uhei> Uaupase ors AL Tae ennsnier
Imoduletor thie fer i fi trusamitier microwave aetwork, on ab
the eile modultor the sleonvity i provided y the bandpass serion
ofthe rvceiver microwave fle

Detorcrs ave provided in both the wironave we
twierowave aistriaution retworks for power reonterirg.

or aod in the

baa Main Sition Bay

‘Aa elated above, the ‘TMU andl RMC for the rosin station trans:
mites ane reeves are generat independently. Buch soureo eoniets
Sita 1-GHa generator and « Gills muitipher wih the associated
tnicroceve caries Hlter, a3 sbown ia Wig 6

TREE a Re

Kame Pepe

fa Qa Bi
QP

ig, (-Miooneve ean dates Cnn sain ay