BSTJ 40: 6. November 1961: Test Equipment for the TH Radio System. (Houghton, E.W.; Drazy, E.J.)

13.4 MB·English

Test Equipment for the TH Radio
System

iy E,W. HOUGHTON and E, 1. DRAZY

To maintain the high perfomance egetines of the TH radi atom,
ender operating comiiony ropaver te mya war nf acura fl tat
Caine. The wcrnary tod fueruments ane incarporated nto mobile
Tent cnet, ane foreach mor sultiivon of dhe TIL syxtom. The nf
Iie ure Aer In aoe deta tht ates £) the raid rai

lea al; 2) the PE trial te se and 31 he pe

1 hear eppacent carly the deyeopment program for the THE
in inns tig ha operate Tho ayatem i she el eto atin its
Tiel sarmanreajertives sal eequire the zgular we of wnat
Fivid test equipment. There, the pling god develounent a Geld
hnniviennine faites was dono eonexrentty ard capraivey ith,
‘il satin tang, ee develope of he et ofthe THysten

‘Ar the onset was desde soil mabe weno al of the
tose inetremente reel ta mk al tine ad sane rouble Leeson
Jews n each major subdivision of ae system. Prom this pilsophy,
tone esis a niaior of woe wt panes, each nar fo thal
pau ion of Fre ale bic ie riz eesighe to maintain Tas
Initey rv Tes ay salar i all pater tabene ed mal
Hawise conrers, aw dng to uesune pean peiormanne of te
Ioocdbunl tin eauizees ad revives aud rhe TRF ed TI prtione
lsc wasiary chanel" FAL terminal see ort, axons wherever
Thor ate FM teainals cad in mates caters ae dew goed
aja naan FM ermal ssn ad reervere? Patton
Sitcing tot xls, appearing at all setehing statin, mainte tae
Protection swith epson? Curewily under develypmient bea aux
firs wluanel cet sek for Lenting haasbaned pantions of the eusiary
she
TIN nee waa steno tuensteat ceuesat, SOE i)

‘Most of this paper i dees ta esesiption of he Bist Uw rt
ini deceriptions ure given of manenanee center testing fue,
fre tn pernit tonbleshooting, rypir wed adjustment of units
Mas hase een removed tzom ihe raven; and tet techniques for
Hevigh-mey video tranersson nnd TP delay distortion mse is
fo Fternaneett Hike the te

eaniterents on the pevarmanes fsbo TH eystom itate whet
‘uanttre som te mensiced, Ue Soqceney cc, anal th ease
ett aceuraen, Telly, tet a: rors should be very emal. ou an
Enbslute basis, Prassoai, they ms cy be small compared co ox
Drove ‘istailities inthe cusatiios binge meseure. This usualy =
Difleant ga Ketween possible ad proetieal accuracies in nuny este
ett in layge divides in rewsuring nveninee, compacts wid
Folchiity of the tet enuipment

est Signals

Just ws the apstem enplose analy transmission gnc ce
tint Toauenbans vo aevemyeh Les purpose, sore rninrsane
Srotrumenr req re for eels hee base, gals appa In x Me
fer tOsme boeebene. a Seve by Sane intrraediate-fecteney haul wed
feM925 eto 4-mne no essary ad. af tho sigvals rom aed
With tae Art tye stave nal in casueter, Digi eal sige
“de ond ples) ate momar in the protection svithing te

Monat Quavsior

Aide vavcty of quantities must be mean with he censor
receive ail ih tal fst eta: nips, amplitude tsnamison,
Inequency,Fespieney deviston, por, ee. Aag’ther, there are eluver,
dfecen: yan iis same of them tach of ee (hos de Ti

Dlfy operating ivatnatvn,simiar quantities are meas. by aimilar
Trethccs ithe revoral dierent bwes Ths yore, together with
Sani tae of emimen costo}, eelie hoe aes dsteetina et
uit, resus ina coradensble rednetion in she equipment sequin

‘eon tho tteicy of vessurenne,
While tho variety of waraities tn he measured bythe profession
rsteing teat oct is wot > eat, mecey 1OD0 dead fe terval cot
‘servations ean be le He 0 denote of he syste
‘A summary of The qugiltes meaeued in the tee signal bei
1m se zoctEsT mo

Tame T— Quivers Messen uy 1 aot ‘ese Equine

hee hs) oa [ele
utter i Fe

ing tat 2a iG otetng se arsed vision eautpment
SUS peo ac eP Sa

vn 4 Table 1. Through Px pew wa ie 60 p10 mh
THF 130-100 me RE 9025-4125 yt Yo designe te ener: equa
go nw est prin

a deeneeey

Ths keeping wh che mre casting sjesives of the TELL aplom wor
1 vtcecersn, she T1h2 system” menstntent acrarasnsare rel
lo be higher, For example, aecurusies iv he 1.02 to ONE slase are
szeverulyeecuied in trossnrennents ot tnenitsion charters, gai,
FAT deviation and U3 sensitivity, eet ‘Three ate laboracory-erare
wuraeies ad They set be cv sel oe x routine basis inthe field
Mihov ime ie oh wvalale for the patie soul satel stttion
rin evoted to tassuement in ths Labor

2 Concyniongs, Specs, Reig

Operating conceninesae se have been ineeased by peckagine
ine tive canola of the iernien’s oud forgoing tet on
nyo stbaivsionse fh syste, hymna eabbration adustnents,
hi wLecever posible hy using soileh gnitoisinetead of puting
Stotione to cha test uur tum, Convenionen and mpd awe al
PTO) na use sverme Teomwest soumest, NARI IMT

In inser mein foyueney vein arhniques for transmiaion,
itnpedace and nearer researc Ta alo ioeeaes the accuracy
tnt eompteeusivenoss 3! Ue menayee eeu. In fect, eerais system
fdjuctments requize Wis simultairous pecctation of performence
ata frequencies in the applicable band, asl, lost time de to
toe: equipment eur or lute has bern imi design: approacbhee
Teading to rasan calileation scabity and component reliably,
Sind by: providing rary ovese for “muaiaining tw rainvenan esp

"The tranemitter-escver Wn ov i Wad to mossare RP and TP nolan
fizae, power, transuicion, we Teleton ceetieent in the broedand
feo. tanenittere an rerevers and an che saiiary chunael. Swen
Trequeney techssques ane raployed Lor tronsriein and rellertion
Contisent mewsursess in Eas Salah vidal eannels af
the 5925-4825.14¢ RF ld

su Prawamsonic ome eftion Cais?

‘The bloek dlagoass ia Hig, 1-ahuunten how RP excep frequency
teansrisin ekamerasties are nena, The fequeney of the JE
filyero) svilion ie antantiea!'s aad eominuavely aeepe up to
TEM me abot a ening heh i eset anya the 325

Jir25.me and, The ontpnl yoo ek roestant ky acme ved
Cont The signal Ive alsa ipa of che enspament indore ik
ntl Uy tie = Laut variable RP atonaatr, wi eomnesng

the cies anew “est fie Snake” so she appropriate divetona
inpler cuiputy Allee sami Yineyh the unko%en, the signal ie
tected in wieowave detector (TE terior 3} eonseced to thew
Tnown nip h This reetiied ontput, iolaged on the oselloseope
siven, gives usasite of transmission deviations through the unkown,
IN fren taking elvis pvr sniale Trequeney identification
hrark on the dapleved slterntie. The compacing srcuit (relay)
pie a reference Ine on He eeilhsrape sere ain hire se
Tite intervals RI TP niegsorereats(¢hroagh networks containing
Frequency afters) re saad hy eplaeing the TP detertoe with an TF

‘The block diagous of Fig. 2 luststes how cletion ovelcient ve.
hrequeney chueacteries are stceuned at KI. The mirowave hybrid
junction sented by the ence wig yeoraton,drseibed above,
rac mes uu 72

(Ouae

ERR

Pig kek dag for RP ea

‘whose ouipat level ions atmpiinde modulated at g 97-ke ome, I
Prrlince mimatch of the cin ander tet, conectd to the bbe
Jivction, unbalance i, Ths realint unbalance signal appears i the

earn of the bybrid jncion, whene it demodtatst Ry the RI Me
Ieotot The desert np Sea ke signed having a arpa

Intional to she refleeien erlTeiot of the impedance mismatch, This
Whe sigral 3 amplifed, eebiiee ard dipleged on the sells pe

‘lover ater on wells, lesen ebaracserete, Cast
isetecred by aj the gan ol the -ke aperture ele
Fine othe eilloseapr mike Kins ues mist, eeerencs
lal cps onthe mesures dhe hybrid junction. Sabaequent
stent of the absetved lana tevsties to thi rferenen we th
the calibrated Sse amas gives the soicton cole i berm
Of devibels, Refetion eoerens expressed db is ealled return ls;
ley rhann hes = 20 og teu ecient)
‘ez same emenpfeegeney mietheds ase employed in mang Grane
mien ane seer surest winsurronts b te TF Inns Wa

flora: Mlk igruee fr TP von aired lia vee
rouuuremente woud Lok were aller to Figs. I and 2, repective
Df rours, istrumentation of there functional blocks requires diferent
Cortes and reeute in components thet lok guite diferent from
their RI countemparts, Hewuves, she sI-ope fine hae eet, the
fecilwcape, the 7-ke amplier-rctiger ntl other lorsreuueney
feral and idesting componenss sre ae in eormor for HP aad RL
reasounenente,

{2 Noise Figuce ad Paver

lula in te mebileconcelo ate unis gare tee et ard a power
moter. There are independent af sho see of se st

"The oie igure test set meaautes the aver oie Fire of radio
ectiver by comparing st intrrally generated noise with white”
‘ae of iEown magnitude. A gaseous discharge tube,’ matched to a
‘warrgnide, furnishes the standard “white” noise. Noise figure is reed
ou 4 eaibvaed sitenuator ‘when ifs adjusted to make the eum of re-
ou res Equuemsr 13

vor noiat and disguise Al igor han chat of te £6

‘The power meter miastins TO pal TP power in Hae age of —10
Alb to Fa sing Tris nasal larga bee ie
Originally desi! for aoe withthe T12 Spon the pene meter i
tdapled or TH by thing s aew RE poweseamaring head which
Ihave over the 5925 G425-me harlot TL 159 reotungular ware
foie inside ditensiomy of 0.78 31.58 itched) wl Te TH

4.8 Phsion Arrangement

A front peas view of the Iounenliee eeivor bist et eo
ig 3. Idersifod chit pocosph are she eeep gecraate, power
FOL ee maa susnioe auoUMest JOURRAT, SFOS It

rncter and orclosone. The mete figure tes sel shale a the nea
her supplies ane located ix Lota res The Ue ae here extnior
Intel sate ne conteos isnot usc

‘Conteetae betwen th list bay and equipment under test are
established by Toh ena ables for LF, and by Seible wuveysie
for RE measuremnte. Bemis of the slative rigidity of Rei wae
ide, all savewuiegnesions are made a the rou of the se, ing
he front ele for re ai peraon.

“A easiderble dex eoplarx as plaosd on eas of sorse and main.
tengsee, Unite vmsstraton, eahle eters, removable peed

‘ratty sunting fr the Beas AR” gentra or it alow ek
teats fir muisonance lets, gjntments al replacment of dactive

4 Sie Geral Detign

nee

Full acizaion a the spt and aeomaey advantegee inerent in
seroptssqueney netsumsmen mvatunin demands thatthe esac
Alipay sepresns oly the tanemins of reesion ens ent tho
tire ances ssid esi sa comestion fr forte hare ice
1 saul ure we detersion eomponents, Aceon rajor earphaeis
fae placed nthe welizcise uf hey como sch TE end TF
Aeiecvom, allemaars, Exbrig.jusevone, nove beige, and ee
Aeetion vist eadbeation standart, wll u eevee couttant over
toy 32 me eqgaeut of she RP bend wal ver Ue ale IB bas. Cone
unt rveponae a9 rayuivos Hak ew omens present, =o ier
feneing tanamcyic Tne, wll uted Lapedances over the eatiro
TP ar RE ar
ens davies ities due ta zapedeceeantrassons ever
yy eft be retuals Taug waveguide ress lines comer 1
Me sone vbr test ane mini uy vin ing welled
ftp imposters in tke HI" and TF svar peneraere. Additional
Cansisivn line evoee are provinded by atabing dieotly wo the
Ss fe eons: ter seo Uh inp conneetne of se LF and
ARM detec and the measuring enirion of Ue TF reatacee bre
sul Ue RE nynd josesion. Save, the RP thermistar powcr head
ie exeangnd for dinel alaebines. 19 wavemude output. Information
fs brought Inch tv the tre cousole thrush nenertce trnemisson
Ives nhs fv of ee mete

ae heisinn tase sweep repetition rsqcney of ep wae mace
tu dlminalorm taaiinnalemasee of enor in etep frequency measure
monte This fequaney provides slight effet trom mnlkples af the
are Dnata
i OS REAERMARE

i. 4 An of state Lv eum

wor apy eee aay “ama” whic sale tr ra be

Tinney rewg iy rh ot mata ater a xt
jn itarrisan chacucttie." ter fase peering his sete:
fo the sie ssqieey wore evoidance uf Teker ut re hand

shed ote} nerve for He Eatoeting somatic Ine! ees
‘noite on the oli

Ss BF Banohe

‘Ties RF peur hn nary Room dovenbe Tielly jn Seen BL

shave and shown fvna’ iy ig, The BP soon i Wenlern
eetie tape L198 ystaes nee wbtion ‘accomplishes
snpleatiea of a S-cpe wate ln Bee emer eleebude, Ast Tostrata
ints, bre ample modshen bdensal ro te prosas sr
thuved by tho sina ie fos" poste sh The loop i hin

face is fens ta rain gc th nto evasteat evn =u
Une we st-P11 han thnaaghout ssn avers evap The
Sowehuce 1 Pig. 1 ince to ave a emaodh ee ling
fro lmourfevie, At is anteresting thoes Uli hie ricult, by
Frat only he Ferteaeinveting ergs, e-em ee hybrid
Jnccon, provides exellent steel, fy maar aaalogo
fothat ofa Hebi fertals euplifer. he cha of eltetonl empl
W726 con wnua stenene maCRNGcan JOLRNAE, SORENNE tt

liye ails ube sui smisly vette peeing acteosata, provides
utpal lve elton oer the cage | Lecbeates 71 dba,
Who ty TF sito With ose tn te gpaerst exp,

the Cosa Fougnenry cheese fvists fer any divessoeal emaplez and
sce outing tee tha LOT dh oer tay Ware agent of the
TY bend; 1 tsacambsfontseyiongy shuneteseiey ae mire
sac with thie accuracy,

‘Singl-on-ro getting fh lor firey pd yma
cal coupling of she hile cory tating ad wepllenlage eet
Froqurney es sdeuied he the rexel easily Tienes meet,

Alte oki sn ta mrter pedi. ied pulse Ue vuuput
‘Jopieney al die bys Iveta rhe tosonenssroqannes. Le pale,
alters aifeatas au slipping, fe added cnet to the oselsecpe
quale, The frome leaf pe ek Lai hms
There nder teat. Taceefere, “ripping” 0 Uke pe we ssa
ig tvagh listers i awocded loa lant aranraee tat tho FF
seaecuter i opanatirg reperly ie presided whet, eet 8 trouble ren

tition ina circu under fs) we ter igen ev Tot i The
Shanary meter, « Ty ede neater baving a leaded i e023 of
000, is inet ly oalfneted roe invests, Without arertim

for ital vy" lon ornaty no, temaperatane ed. unis
ge fregmrucy fens S880 ste co b8O0 esi he metre i Ia
vara af —2 aie, CE mone sir‘ ve ering, Tc
Tose 07 BP-II and AU-LE eaeuite #4 Te aleny requam
feveneos un en 125 ace ace eal wll aw aenaey 0° 5

10 10 Gonertor

"The TP grasa a fanotovalle anlage EP pene ily
bo Hee koe cpmoacing traqreney, enphoee wrypedataea wid
iV ig gente hy bo

‘setae eeeaitre he AL se

wefeedbaek vor ine." tenet ia ep ever the LE range

ihe
bp sunying Ie ures Loonyh a satzzable indsetor fa ho “tale
creat A Tian, fis anti stomarie el roan, hich ate
fn e anode sopn'y vel ge of ts aro eaes, mits he slp
EL }20 2 O03 dv asthe ellatcr serps ever Rs fesquones ree
‘A selene saueen ingle (havin grzanator roscta sor.

evion resigns nt 1 abmae wich i ithe conte euadietor of he
fceisial ly beyone the aamp-ng poir: Zor emerrarie level ei
Fileirg ate aclence reuintacn the Taronin ootpe: 1 dh mere
bow te feet fri Seva attemeto aban i. Fi. 3
retusts cc utp poser iu Dy db rleps betwen 130 ebm and 71