RADCAT Case Directory
  Category 9, RADAR  
Rating: 5  


RADCAT is a revitalized special project now being conducted jointly by NICAP & Project 1947 with the help and cooperation of the original compiler of RADCAT, Martin Shough, to create a comprehensive listing of radar cases with detailed documentation from all previous catalogues, including UFOCAT and original RADCAT.

Coded IFF Signal From UFO
June 21, 1954
NW Washington State

Brad Sparks:
June 21, 1954.  NW Washington State & Vancouver Island
8:14 p.m. (PDT).  3 ground radars at 2 ADC sites 
tracked unidentified target at Georef LE 1604 [49°16N, 124°56W, central Vancouver Island] traveling at 200 knots (230 mph) at 15,000 ft intermittently until 8:24 p.m. and picked up coded IFF Mode 1 transponder signal from UFO in response to radar transponder interrogations from Naselle AFS’s [TPX-22?] interrogation set [possibly using KY-95 or KY-97 encrypted signal generator] which appeared to be emitted by an [APX-6] transponder or something simulating it on the UFO.  (Radars were: FPS-3 search radar and FPS-5 height-finder radar at USAF ADC radar GCI site Naselle AFS, Wash. (ADC 759th AC&W Sq 46°25'20" N, 123°47'53" W, elev. 1,926 ft) and ADC Direction Center [search and height-finder CPS-6B] radar at 25th Air Division, ADC, McChord AFB [47°07'23.37" N, 122°29'32.73" W], Tacoma, Wash)
McChord AFB ADDC vectored 2 F-86D jet interceptors on an existing Combat Air Patrol [CAP mission unknown, possible earlier UFO intercept?] at 9:00 p.m.  F-86D callsign Pronto Blue #2 picked up target at 28 miles at 25,000 ft, then UFO target split into two “clear distinct” blips at 9:35 p.m. [does not necessarily mean object physically split into two; two objects in close formation within about 1 to 1/2 mile separation would appear as single blip, then moving apart would make separate targets resolvable].  F-86D turned 30° left to attempt to center the blip on his airborne radar scope [APG-30?] and descended from 25,000 to 6,000 ft to put target high [out of sea clutter apparently], increasing speed from Mach 0.85 to 0.9 (560 to 590 mph), closed distance to 6 miles but unable to identify.  UFO outmaneuvered F-86D and moved downscope from 30° to 60° on left side. F-86D callsign Pronto Blue #1 picked up target at about 9:36 p.m. at 20,000 ft and tracked the multiple blips on parallel downscoping from 30° to 60° left on his airborne radar scope in 20 secs or 3 sweeps of radar [possibly 6 g velocity reversal if it approx. 6 miles nominal distance].  25th Air Division ADC pilot in T-33 heard ground-air communications between all sites and aircraft.  Case sent to ATIC but not in BB files.   Possible visual sightings in NW Washington reported to sheriff's offices and news media.  (Sparks;  NICAP website; Jan Aldrich;  CUFOS/Mary Castner)  1 hr 22+ mins    8+ witnesses

Fran Ridge:
I discovered this document on 4 Nov 2016 in a box of docs I'm sure came from Jan Aldrich a long time ago.

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