NEW 

EXCLUDED TRom '11-0MATI 

REGRADING. DOS DIR 5200.1 

%Q.. 

DOES NOT APPLY 

NRO APPROVED FOR RELEASE 

1 AUGUST 2015 

REPORT P40. 

DATE: 

';:... Lp ps 01 5 

HEMA'A 

Contrifi Sstr 

• 

Prepared by: 

S, ORAGIA / S. OROS 

Approved by: 

W. N. HARRIS 

1H5 bC','.ENT COiL,A!:•!; INFuRmAl tON AFILL,-.1• 

!NG •,T 0'1, I DO 2: /SE OF THE UNITED 

STATES Vi! E! !!;; :'! , ?.SEAE!ING OF 01 ESPIONAGE 

LAWS, WI r: Is SECTIONS 71a AND 774, ITS 

TItANSm1<;:0•-. : 7i P :YELATION OF OS CON. 

TEN TO AN UNAUTHORIZED • rEkSON 15 Bit CD BY LAW. 
NRO APPROVED FOR RELEASE 

1 AUGUST 2015 

A \iv 

Di 

( 

, 

. . . . 

.21 

1 1 1 1 '3() 

Peco:rdiag, — „ • * 

— . 31 

ESTIMATE OF ,TISTM PERFORMANCE 32 
NRO APPROVED FOR RELEASE 

1 AUGUST 2015 

A 

-;, 

o•ot carrier fn.,.1(111r.c1,..:zi. It will. 

•:••••.* 

be riem3sary to on.cifte.w the rncorded vtAii;,i4.tfrafac.- r..10.,,iwr•to 

oTk inc: 

Cor.:dany fcir 

.;,4,72.. ottaT1 0•11.':::1. 20 rt. eq.1.1.-iprz,r,,t. 
NRO APPROVED FOR RELEASE 

1 AUGUST 2015 
NRO APPROVED FOR RELEASE 

1 AUGUST 2015 

• 

I 

• 

a se7oT,...1 ,.2.,: 1aUtIle. 

a 

SECRET 
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1 AUGUST 2015 

7111. le ted 

• -4- 
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1 AUGUST 2015 

r . 

•4 

t.41, Ir‘s 
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1 AUGUST 2015 

Iv- 

• 

• , • 

• • - 1 

-6- 

, 
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1 AUGUST 2015 

III 

cr t 1 i irldAT,-16,e n t f r y 

froz,‘J 1D09 to 1,2C, p-1-ae:ti.c.ily a zoo 

o^17C)n 0 av rr.;ce 

1,_ntonnza tO 1.14-}Dly both chnnnc!.1s or -

iihrouEb m,tuprK. 
-3- 

NRO APPROVED FOR RELEASE 

1 AUGUST 2015 

S 

A V 

e tro • banc. for 

by Of f.i7e dief'ete a)ctio 

• 1 te, 6b sbc7c thc 

excee, tne .3./Jcsr is s':',oprey-1 

frnuencJ cdnt;:.1 in activated, 

cLrcitrs, an t,e• :)e:altor is tt 1 Joe 1.--Terd - La then 

;f1' toe. f'ncy u nts of the /amplitude modulated 

wiln a eiic band of frevenciee. If 

as sinal iLets tt:;.L; tef., the 5a54 o'er :Lo held in i:.he "Tfcek'' mode for an 

anotncr tet, is The signal is 

cecke to see if the detected frequency mrlponents of the amplitude 

5iodiated enveloo the carrier consists of discrete audio tones which fall 

within, epocific narrow hands of fregtvincy. If this last test Is net the 

receiver is retained in the "loo,c,, mode until the signal disappears or the 

tone content disappears. 

The "A" receiver provides the following ihformat onl 

Carrier frequency 

Carrier doppler frequency shift 

Audio tone identification 

Audio tone duration 

Signal level 

Short baud indication 

Temperature 

Power supply status voltages 

Clock 
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1 AUGUST 2015 

0 

tl:..o2h a. 

ot! 

(C,7mr). 

- a tel..cet7 poi'Lt 

Video o.G,t. :r,:oc,3 to demodulator 

3. A.FO Lop 

Threhold. loop 

The output of the :.scond ',F. to the tz-- sho1,.1. loop Dr.Krt. or.: in 

thc threhold b.;te to v - ,..rify that the carrier power is v,:rlter than 10dt 

aTrovo tie pverw noise level. If the carrier powr vet the thrshold 

requimmnt a millisecond. "shOrt hole 13 dQ--.,:ilopkA. and sent tx.) 

Cemdulator to enable,the "modium hold" test ciruitry, the sweep circuit 

is disablcA, the MO loop is enabled and causes the voltage controlled 

oncillator to trri.c!x the signal carrier at; it unei..ergoe a doppler frequencyshift. Tha threshold circuit alga enables the cire,Aitry vhice gives a 

iceaenre of the rate of•change of the doppier frql.,ency 
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1 AUGUST 2015 

e 6 lo 

^ WI; r The 

tOr „ 

in 

i•,-; 'H. .2 

of 25 (•-po 
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1 AUGUST 2015 

A \ 

fAlt put futhe 

aq 

output of thc.:.: 

a 9.nd full. wave rt:!-.ctifie. 

1:1tra aro t.1:4 o1 t1a five c[ii.:.3cn,:te -

TUOi LC1-a filter ..i114:,puts "R" 0.7.td, and 

rr the "abort outp:A 

by the ".1.1Drt hold' tegf::-ur.,:nate:-2 a 

40xiL1 inc.= hold" gat, vhir!h maintrAns the receiver in the 

• ');1001J'r, twai. of the inters, reed2 a ceperote theshOld. (:;ate. The 

five Gat,.?:F: outputs. are "OR' gat,:k1 to give 

aitaiy.Ce the recc:Iver in a locked mode for an 

output OF each threshold gs.te is also fed into f:.1 diffrcntiatIng .

Th :.7 five differentiating, circuit outputs are OR a!atcd into circuitry 

vhich measures the duration of each audio tone and gives a "short bit" 

indication when a tone is less than the prescribed. length. The output of 

this OR gate also initiates an eight second timer which. keeps the 

receiver in the "lock' mode during signal fades. 

SEcrET 
NRO APPROVED FOR RELEASE 

1 AUGUST 2015 

a 

for t111::: in±'4t.rntity, 

VCO, Th pin-22 <

r c VCD and the R.F. enplifl.er„ 

coatin:Qe: to ;:zw-,2ep RE longo tMr IOp clock is 

fren gunnia. _;tnpped to lock onto a signn.i by r, sweep 

eloe lhhibit circuit In order to provide frequency information wheo 

thQ :weep stopo the eight binnry aountern of too staircase generator are 

orrared in throe groups, consisting of two groups of three binaries 

and. one group of two r,,,nich, with toe digital to analog conversion, provide 

two eight-step and one four-step frequency readout; in. quantized stop of 

195kc, 1.5mc had 12,5mc,respect1vely. 

-12— 
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1 AUGUST 2015 

C,7 o ne of 

1 lo6.co onto 

f,Jo/ :Thieve ?S hei he 

thr€,:7:hof.1 le exce ,64. the :';,?eop is otow.:,ed 

The zsto,AD'Ac frequncy (A.Fr loop aetivat.d and the hold 

i cnableh, The encheolced to 

if i.he def.ecte3 freohencv c:cmponents of the amolitude modulated 

eltviAope of the .Ler dicrete tones 1,4hih fall within 

specific nerrovbandel of frequency- . If the lest tet is net the receiver 

in rteinod e inn loce mono until the receiver output data have been 

read out; the reoeiveir then rturns to; the search mode. 

he "O'c receiver provides the following output data 

Carrier frequency 

Signal level 

Temperature 

Power supply status voltages 

Clock 

A highly accurate crystal clock provides part of the output of both 

the "A" and "B" receiverc. The clock output consists of three octally 

coded readouts in quantized time steps of 0.5, 11.0, and 32.0 seconds. 

The clock provides a four minute, 16 second (256 sec.) time vernier for 

the vehicle time. 

SLCRET 
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1 AUGUST 2015 

tr coqtroJlud 

Tto.„: :.:J9tp.2t firt pass:-.L 

frertiAnc!yar I Ii 70m,O. T17, outpu 

AJ.; - ttic cu.ltput 

00„1'Inc) in 0.QtWit 01 

a 10kr crystal tA;:„Ia.J,pas --

file output the logarithmic 

intprIvu7d0„ - ,- - ar:y1751ifj,,c:% -

iF arnliflr fm.x output; 

1- Video - to dlerliodulator 

2. levol tolmetry point 

AFC loop 

4.. Threshold loop 

The output of the log IF n'amlifier is operated upon in the threshold 

gate to verify tht the carrier power is 10db above the average noise. 

If the carrier power meets the threshold requirements a 20 millisecond 

"short hold" is developed- The "short hold" dIsnUes the sweep, enables 

the automatic frequency control (APO loop and enables test circuitry 

in the demodulator. 

-16- 
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1 AUGUST 2015 

fo3- it 

'1 .ijd the holrl frm he .rc.,i:Aver are 

to r..A.ruAt whIch the -long 

in to 'lock" ma. e, The, outpilt of t-IT:2 threci 

th:Y, lieit.iote two bir:tFls 2.'s the and 

fgurlo 

'Zvery ion wilIA:secondE a "read control" pP'se ie dev lapeci in 

cont,o1 circuitry by having F-1 eennoo to commutatr mgeente 

approximately every 100 milliseconds apart. If these 'read control' 

puleas a.re not inhibited they will reset the "long hold." gate' ah,C permit 

the receiver to return to the smept 'frequency search mode, The 'chart 

hold." trigger5 a 155 millisQcond monoatable that activatefs', an inhibit 

gate to keep the "read control" pulses from resetting the "long bold" 

gate for 155 milliseeondc. The phase between the "short hold" gate and 

the "read control' pulse is random. Consequently, the receiver can remain 

locked in frequency for between 115 - 200 milllseconds, 
NRO APPROVED FOR RELEASE 

1 AUGUST 2015 

;•li'lry• th,T.; 

• 

to an,;.11,.. 
NRO APPROVED FOR RELEASE 

1 AUGUST 2015 

A \A 

of 

with wit L',Kat liv/.21-61- 

11A;i1oz.v."J. nui,;:,t.ituLe0. for tilt: 

r;.Trirt. A c_.orre,1!.Ltin, and. 

tho p:ppropriate grc,up r-H17-afir&L 

The other portion of the calibration consitE of a t&Yu.:LIioe (or 

nnalog aurw) of thc voltacc ovtput - -c- r116 thc: eitum parlmer. variatio,q, 

Irlluried for reference purPose8 are the tstr,ilated calibrations fc.). Oblt -

Ne.. 4. Thene are typ:ical to 2how the IT;eneral ti..;naN'ior of th,e recivers, 

For analysis prposcf;, specific curves should be nsed for each mlssion, 

and sl.:)ch curves are snpplied after the final calibrntios prior to 1Burwh. 
NRO APPROVED FOR RELEASE 

1 AUGUST 2015 
NRO APPROVED FOR RELEASE 

1 AUGUST 2015 

A W : 

i CC (..310ek 

19 

O :aucic 

3 - 

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22 

23 

214 

25 

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tLis, 

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,148 

,149 

5o CL 3 

,.) 
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1 AUGUST 2015 

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NRO APPROVED FOR RELEASE 

1 AUGUST 2015 

AW- 

• 

•-• ' 1-, 

15 ‘ ' 2 )_o 17 - 3 

16 , 

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22 4.7 CAL Z 

+ 6 48 .1 

2)4 49 ri 

25 F, 
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1 AUGUST 2015 

• 

41, 

2 

6 

'4.05 

2 „ 

7 .° 
NRO APPROVED FOR RELEASE 

1 AUGUST 2015 

A 

rr: 

1?. ;•! 

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14, ?

1 

-t 2 7 

6 3.45 .3 

7 3.95 

8 .6 
NRO APPROVED FOR RELEASE 

1 AUGUST 2015 
19:_t.:?: l '-‘;-, 

NRO APPROVED FOR RELEASE 

1 AUGUST 2015 

\ A ; 

L.:7, L.) 

-2:: ,.:, '," ,.,, 4 - , . i ::): ' t 'i":::;f4T: :;7;-.4 ' 4. . , • '. ''' 

1 .: l 1 1 

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NRO APPROVED FOR RELEASE 

1 AUGUST 2015 

• 

rconri both 

unit is re.,3(..1ing oht OrM.;:; tbe 

r26.cPA cyc1c,r6:fmov1ng th rcproduce commn.'J. v1.11 allow nzAt t,) 

.)de of opration, 

hcn th.e end of the timpe is reached. 1J el-thf:!r the. 

reprodhcE,. modAsn3 2f oporation the unit atttomnt!).mily 
NRO APPROVED FOR RELEASE 

1 AUGUST 2015 

.?••••:. 

1•:1J. 

• ror6 of tl:errp1c f,AA -

reo0ily d:tinguiz;hable y viced 

it :1 11 to utiliy:e fo

urt 

): onginec,,rint of 

performnce. ,74loo L-rACIF; It 

from which rlignal analy3is may be Tn-formed. 
NRO APPROVED FOR RELEASE 

1 AUGUST 2015 

• 

• "s"." ' ' 

tC It 

cc 5pecifl.c psz F;hc„.r:.t 5c1gmnt of .

ocrw:d .on ccteh)metry traamitter turn,),J off. prici: to ,,M1c27. 

t,rkt,::mitti.h. New je7- ey inform8tion.„ The c=311:on,itior. cat: cc 

re,vjed to wir)id tb15 difriculty 

The scond mi,a5ion ci'rlowed both receivers and opsrting tc, 

conciesin 4-q" the mission., No obvious traffic woo roc. d ok! these 1--,1:evirdp. 

examined, Recorder and telemetry link operation waa onmC,.„, These recorth.t 

are st.1,11 being examined in detail, and it is no'ir, possible to place a 

relative figure of merit on the equipment„ 

The quality of the data retrieved fro:f, thee two missions ww,., good e 

and a high degree of confidence can be placed on the liealArQd value ci 

th dpta point6„