OBSERVATION OF JAMMING

• Document Type: CREST
• Collection: General CIA Records
• Document Number (FOIA) /ESDN (CREST): CIA-RDP78-04864A000100040014-1
• Release Decision: RIPPUB
• Original Classification: C
• Document Page Count: 2
• Document Creation Date: November 11, 2016
• Document Release Date: December 15, 1998
• Sequence Number: 14
• Publication Date: March 16, 1948
• Content Type: REPORT

C.
A:mt4 01
el ASS*1 *AliC74
Approved For Releafiariaega=8-04864A000100040014-1
It4ronE PO
SU ECT Obzeivation of Jeaaing
pLA
K*1 iIRE
DATE
ACQUIREDU March 1944
y RV(
SOURCE
6f
UMW
DATE D TF 1 196
NO OF AC
NO C
tum.:D
SUPLE .qa 70
R2PC'
caLecioors PRELIMINARY 11RADING () CC :4TF:
Y PCS'73r ',V I PR, )"A 3 '::ANNO1
riuL
tleuF i CD
NF RMI
ufiCES
Oa
it
A
II Noy is
SOURCE
flAt100A MA%
118108111 A 1 SO
P. iNt REV . OOO
04 .11
FOIAb3b
4. 5
UNEVALUATED H\IFORVIATON FOR T D*:Cil
USE OF TRAINED IO:ELLIGHICE: ;It%1,..YSFS
1.
Purda tti1 observationS (rsPorted in 0C-2143 a3
seemed 'o indite herate jimaing of MU broadoe0;A:
Par lanall, *boozy Gus of all troascittore carrying tiAn 111704 %it t4
made for seven dirs during the period 1 - 7 Micah 1666,
0, All audible frequencies cf 'MA weirs found to to jAtmod Love:047
dor sic 4his perio6 (daily 06:00-00:30 NOT) with one excep4toa: r.r, HArch,
whoa TDUSIA seasonal frogman*, ohaages-hosece effeotive, the to cia
Ohman4a of 16260 and 16130 kiloarcles wore 'clear at 06:00, while ths two
disa010.a4od frogs:incise of 6060 and 6120 kilocycles tisro strn 16,,mail as ot..
pre40Ing doe: one ;ismer traced 1500 kilocycle, 104 and Interfered with
theroateg partite* of the broidcazt, and on all aummosding Awl 11$2W
(Nossoltita) was effeetivelv jammed. Owimg to poor propagationsl oitio
16130Jci1ocyclee (California) was nosily inaudible rod not jammed; but on
the darn it was audible, 54,1411 PromPt4 a4 offiultProtr PTInte,
The full lateasity of ell lotargerios sigaels bei 1 At 057/06 OC
and abates at 04:30/06:33 BS?. Most of the jawaers aro also blr.rd
nitteatly at rivinool power tuniag up oa YOUSA frequencies prior to thio
how.. Cloaltrilows all elm:mots of the palarke 41470619 Ottfat *0 r*ins
0*. to tell miculos after 06:30.
4, ./eterffireae* of similar character has teen otzervod At tho saae J.ue
Os a tow 'erring addition:1 free/acacia* act used by YOUSA but hear to thmlo
is us Thc Are hello:vet to be spurious radiations of the jolasimg equip-
ment,
6, ?b int.rsrenos a,prt.5cod oa each channel la lov
MI, WO or thrte troug et 1046 carrier waves, somr rather U,43%4
are umually haste added tbe is A 44607 widolUnd lm- frequency buzz lr
hash mod seawall, one Or *oreeulogise oectllstore tr two typo?, (1) 1.v.nctr4
S to lp kilcorelos, and (2) eosins Iasi than 100 cyttlss p.tr secohe., A.
Woos o/ahlo carrier with ?2 modulotioa, occasionAl morso siposi, And
liarrOrig. less dosoribable soimes have silo teen observed
z
Okm
Mir
MASSIF
X
TION 11191
OMTMEOPIDN
Approved For Release I 9(all1feliK0111**78-04864A000100040014-1
Approved For Release 199?0Ncimtetykt78-04864A000100040014-1
oo-,r-39
oaNnTOMAL
168549
6, unidirectional antennae adequato to fix the direction of tt
jamming scarce aro not avallftble at this post, bat existing facilitl
yield intcase interference vhen oriented to the north and south lutArant9.
and moderate interference when oriented to the east and we$t cluad.rne,se
7, No tha: nation is known to be using any combinatif;r. of fquexicis
resembling the VOUS* schedule to the Par Thlet at that hour.
Page 2
Approved For Release 14ONFIDENT-WiiP78-04864A000100040014-1