28953095.pdf

|  1. DATE - TIME GROUP | 2. LOCATION  |
| --- | --- |
|  Feb 53 1229Z | Finland, Minn.  |
|  3. SOURCE | 10. CONCLUSION  |
|  Radar | RADAR INTERFERENCE  |
|  4. NUMBER OF OBJECTS | ATIC electronics specialists view this is caused by interference from another radar station.  |
|  One |   |
|  5. LENGTH OF OBSERVATION | 11. BRIEF SUMMARY AND ANALYSIS  |
|  Object appeared on radar scope at a heading of 155° at 140 miles. Object appeared on scope as being twice the size of one a/c. |   |
|  6. TYPE OF OBSERVATION | Ground-Radar  |
|  7. COURSE |   |
|  8. PHOTOS | ☐ Yes ☑ No  |
|  9. PHYSICAL E…

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AUTH: CO 756th AC&W Sq
DATE: 12 Feb 53
INITIALS: JHW

756TH AIRWAY CONTROL AND WARNING SQUADRON
Airland, Minnesota

319.1
12 February 1953

SUBJECT: Radar Observation Data Sheet

TO: Air Technical Intelligence Center
Wright Patterson Air Force Base
Ohio

Under the provisions of ADCR 200-5, 20 October 1952, the
inclosed Radar Observation Data Sheet is submitted.

1 Incl
ADC Form 123

BRUCE H KIRKPATRICK
for Captain, USAF
Commanding

DOWNGRADED AT 3 YEAR INTERVALS:
DECLASSIFIED AFTER 12 YEARS.
DOD DIR 5200.10

UNCLASSIFIED

T53-1992

RADAR OBSERVATION
UNCLASSIFIED

I. QUESTIONS REGARDING EXECUTION REQUEST EQUIPMENT

1. What type radar equipment is involved?
CPS - 3

2. Has there been any recent maintenance difficulties? If so, describe.
No

3. What type modulator (i.e., spark gap, hard tube, etc.) is used in the radar equipment?
THYRATHONE

4. Was the AFC (automatic frequency control) circuit of the receiver operating properly?
YES

5. Has interference from another radar set been observed recently, and are personnel familiar with the effects caused by an interfering signal?
NO

6. What type indicators, "A scope", "Escape",…

UNCLASSIFIED

NO

RAIN SHOWING CLOUDS NO EFFECTS ON LIGHTING.

NO

NO

NO

1. Did any two local personnel observe the unknown target on the lower level? YES, LT. KENFIELD, S/SGT. DUFFY AND OPERATOR A/2c CLINE. OPINION UNKNOWN OR A FLYING SAUCER.

NO

155 DEGREES AT 140 MILES ALTITUDE UNK. ESTIMATED 15 ANGELS - TIME 1229Z

THE SLIP OF TWO (2) AIRCRAFT

DOWNGRADED AT 3 YEAR INTERVALS
DECLASSIFIED AFTER 12 YEARS
DOD DIR 5200.10

CONSISTENT SIZE

UNCLASSIFIED

CLEAR & SHARP

UNCLASSIFIED

8. What other (aircraft) targets were observed in the same general area, altitude, and time as that of the unknown targets? None.

1229Z of INITIAL
1229Z PLUS 48 SECONDS

RANGE - 140 MILES
AZIMUTH 155 DEGREES CONTROLLER - 1ST LT. KENFIELD

INSTRUCTIONS: PLOT TRACK OF TARGET, INDICATE RANGE AND AZIMUTH. GIVE TIME AT START AND END OF TRACK.

DOWNGRADED AT 3 YEAR INTERVALS; DECLASSIFIED AFTER 12 YEARS. DOD DIR 5200.10

UNCLASSIFIED

UNCLASSIFIED
S.R. 10
UNCLASSIFIED
Finland, Minnesota
February 1953

I. Description of Incident
At 0629 CST an unknown object appeared on a radar scope on a heading of 155° at the 140° mile range. The object appeared on the scope as being twice the size of an ordinary aircraft.

II. Discussion of Incident
The radar station involved sent ATIC an Electronics Data Sheet covering the sighting and from this, electronics specialists determined that interference from another radar station caused the presence of the unknown "blip". No visual observation was made at any time.

III. Conclusion
Interferen…