PROJECT BLUE BOOK

1. DATE · TIME GROUP 2. LOCATION
Feb 53 12292 Finland, Hinn.
3. SOURCE 10. CONCLUSION
Radar RADAR INTERVERENCE
4. NUMBER OF OBJECTS ATIO eloctronics specialists view this is caused by iater-
One ference fron enother ridar stadi on.
5. LENGTH OF OBSE 11. BRIEP SUMMARY AND ANALYSIS
Obj et aipasrid on ridar scoje at a heulag of 155? ot 110
. TYPE OF OBSERVATION miles, Qbgoot apauared on soo,e ao brt d bide the sige of
onea7e.
Groudd-inder
7. COURSE
8. PHOTOS
0 Y. 0 Y..
No
7. PHYSI 7. PHYSI DENCE ENCE
a Yos D Yos
No
FORM FORM
FTD SEP63 0-329 (TDE) Provious esiti ene of this lorm mey be used. be used.
8

a
AUTH: CO.756tH_ACW
DATE: 12 Feb 53
Muttipt 756TH AECREET CONTMOLAND WARNING SQU
inland Minnesota
319.1 -
UNCLASSIFIED
SUBJECT: Radar Obsem tion Data Sheet
TO: Air Technical Intelli zence Center
Wright Patters Base
Chio
Under the provisions of ADCR 200-5, 20 October 1952, the
inclosed Radar Observation Data Sheet is submitted.
albert i wood, alber d Ccuff vsg
Inel ofVSAP
1 Inel BRUCE H KIRKPATRICK
ADC Form 123 Captain, USAF fCaptain, USAF
Commanding
DOWNGPADED AT S YEAR INTERVALS; DECI
ASSIFIED AFTER 12 YEARS. DOD DIR 5200.10
3
ONCCASSIFIED
T53-1992

HADAR 030 UNCLASSIFIED
I. IPNENS
I0
CPS - 3
2. las trere beon ony recent minteanace diifieultios? If so, degeribe.
No
3. Vhat Wie modlator (i.e., dpark ap, ard tube, ete.) is used ia tha radnr evtiroent?
THYRA TROME .
4. Nas the AFc (outorntie frepeacy control) circuit of tie recaiver epemtias properly?
YES YES
s. ins interierence from onotter rader set been observed recentl,, nnd are cereonnel ins interierence frod onotter rad:r sot been observed recentl;, nnd are cerconnel
familiar with the erfecto tamiliar with the erfect cauad hg an intertering si nal? cauad hg an interfering si nal?
NO
Lcators, "A Lcators, "A reone", "gncope", etc., cone", "gncone", etc., were were used to folloy the tar get? used to folloy the tar et?
P.P.I.
7. What vas the redar soan rate? What was the redar soan rate?
n
. That wes the ppproximte frequency of the trensmitter?
1278 NC DOWNGRADED AT 3 YEAR INTERVALS;
DECLASSIFIED AFTER 12
QUESTIONS DOD DIR 5200.10 YEARS.
II. ONNERAL
1. what were the gelera was observed?
GOOD
or detn fron taarby U... empern cure
bury. humidity ve altitde, and ad velooiay w altitudet
VISIBILIN -2 TEM. DEW POINT 6 #INS WEST NORS WEST 8
ot3r courbr n11s
the osfacts Lor(et-na
Y2S
3T53192

8
-
o
thooito, or Ment to -109
the ot geyvre?
NO
RAIN SHOWING CLOUDS NO EFFECTS ON LIGHTING.
NO
DE
NO NO
n/0 te
210
NO
. TEd C
YES, LT. KENPLELD, KENFLELD,
S/SGT. DUFFY A MD PPIPA OWN A SAUCER.
SAUCER.
mptast Itilono As t 10 on to
iniiertorol od, attn, to tiis roport. (let on 7OD
NO
15 stat peligo, aelut, oititale, and das wio t
ALTITUD3 ES TIE 12294
0
M BLIP NO(2) AIRCRAFT
3
COMSISTENT SIZ3 DOWNGRADED AT 3 YEAR INTERVALS DECLASSIT
IED AFTER
CONSISTEIT FIED
OLMR & SHARP

W E
135 135
1229Z 1229Z of INIELAL of INI VAL
12292 PLUS 48 SECONDS
RANGE - 140 MILES
ALIMUTH DEGRERS CONTROLLER - 1S
INSTRUCTIONS: PLOT TRACK OF ARGET, INDICAE RANGE AT SART
AND ND OF RACK.
T DOWNGRADED AT S YEAR INTERYALS; DECLASSIFIED AFTER
DOD DIR 5200.10 YEARS.
UNCLASSIFIED

S.R10
UNCLASSIFIED
Finland, Minnesota
i
I. Description of Incident
At 0629 CST an unknown object appeared on3. radar scope on a heading of
1550 at the $240}$ mile range. The object being twice
the size of an ordinary aircraft.
ncident
The radar station involved sent ArIc an Electronics Data Sheet covering
the sighting and from this, electronics specialists determined that interference
B from another radar station caused the presence of the unknown "blip". No visual
observation was made at any time.
III. Conclusion
interferenca. Interference.
.
).
DOWNGRADED AT 3 YEAR INTERV'TS:
DECLASSIFIED AFTER 12
DOD DIR 5200.10 YEARS.
3
3
T53-3695 UNCLASSIFIED
UNCLASSIFIER