Radar Observers' Bombardment Information File (ROBIF)

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Published: July 1945

In the fall of 1943, the British debuted the H2S radar, nicknamed Home Sweet Home. This technology was a means for bombardiers to find their targets at night or through overcast clouds. Up until that point, bombardiers generally had to see their targets to hit them. The United States developed its own version of the radar, named H2X. It was nicknamed Mickey for Mickey Mouse, which was not intended to belittle it.

Although radar had been invented, it was still a crude and mistrusted technology early in the war. H2X radar would have been the latest modern technology in 1945. In actuality H2X was not very precise. It was better suited to area bombing than to precision bombing.

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Item: 000023

Viewed: 6275 times

Comments: 9 (see below)





  • Private Collection

Related Items:

  • 000022: Bombardiers' Information File (BIF)
  • 000021: Navigators' Information File (NIF)
  • 000145: Radar Photography
    AAF Manual 95-101-1
  • 000146: Radar Photographs
    From the Photograph Album of John E. Voisin
  • 000148: Pilots' Information File (PIF)


Added: January 31, 2007

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Army Air Forces Collection, "Radar Observers' Bombardment Information File (ROBIF)" (item 000023), AAF Collection, (accessed 17 January 2018).

Image View Description

Judging by the cover, there is no doubt this training manual targeted Tokyo, Japan.

This is the complete document. Due to its large size, you can view/download this document in the following separate sections, depending on your interests.

196 pages; PDF (.pdf)
Original item: Book; 8.5 x 11 inches
Viewed: 1582 times


Table of contents and front matter.

10 pages; PDF (.pdf)
Original item: Book; 8.5 x 11 inches
Viewed: 850 times


Section 1: General

Crew Coordination; Security Measures; AAF Form 38;

10 pages; PDF (.pdf)
Original item: Book; 8.5 x 11 inches
Viewed: 397 times


Section 2: Radar Equipment

AN/APQ-13 Radar System; Control Box; Computer Box; Azimuth Control Box; Synchronizer Unit; Range Unit; Antenna Equipment; Range Unit Calibration; Tuning; Operation; Maintenance; Block Diagram; Circuit Diagram; AN/APS-15A Radar System; Receiver-Indicator; Control Unit; Range Unit; Comuter Box; Calibration; Tuning; Operation; Beacon Operation; Maintenance; AN/APQ-5B Auxiliary Radar System; Control Box; Tracking Unit; Indicator; Operation; Maintenance; Operational Differences APS-15, APS-15A, APQ-13;

46 pages; PDF (.pdf)
Original item: Book; 8.5 x 11 inches
Viewed: 701 times


Section 3: Auxiliary Radar Equipment

Loran; AN/APN-4 Radio Set; AN/APN-9 Radar Set; AN/APN-1 Radar Altimeter; SCR-718 High-Altitude Absolute Altimeter; SCR-695A Mark III IFF Airborne Transponder; SRC-729A Radar Set; AN/APN-2 Radar Set; AN/APS-13 Tail Warning Radar; Flux Gate Compass;

18 pages; PDF (.pdf)
Original item: Book; 8.5 x 11 inches
Viewed: 606 times


Section 4: Radar Navigation

PPI Scope; Radar Fixes; E-6B Computer Method; Form Method; Computer-Drum Chart Method; Determining Groundspeed, Wind and Drift; Target Timing; Racon Navigation; Radio Navigation Aids;

28 pages; PDF (.pdf)
Original item: Book; 8.5 x 11 inches
Viewed: 451 times


Section 5: Radar Bombing

The Bombing Problem; Radar Bombing Equipment; AN/APQ-13 Computer; AN/APS-15A Computer Box; AN/APQ-5B Tracking Unit; Direct Bombing; Coordinated Bombing; Inherent Errors; Bombing Tables;

16 pages; PDF (.pdf)
Original item: Book; 8.5 x 11 inches
Viewed: 487 times


Section 6: Radar Bombing Procedures

Preparation for the Bombing Run; Drift Correction Methods; Maximum Scope Defintion; Procedure Turns; The Bombing Run; Low-altitude Bombing (LAB); H2X; Computer-out Bombing Procedure; High-altitude Bombing (HAB);

20 pages; PDF (.pdf)
Original item: Book; 8.5 x 11 inches
Viewed: 405 times


Section 7: Radar Intelligence

Mission Planning; Radar Intelligence Procedures; Radar Reconnaissance; Pathfinder Charts; Negative Relief Maps; Relief Maps; Supersonic Predictor; Bombing Assessment;

30 pages; PDF (.pdf)
Original item: Book; 8.5 x 11 inches
Viewed: 384 times


Section 8: Radar Photography

General Principles; Procedures; O-6, O-7 and O-8 Radar Cameras; O-5 and O-11 Automatic-recording Cameras; O-9 and O-10 Radar Cameras;

10 pages; PDF (.pdf)
Original item: Book; 8.5 x 11 inches
Viewed: 412 times


Index and back matter.

8 pages; PDF (.pdf)
Original item: Book; 8.5 x 11 inches
Viewed: 0 times

Comments (Add a Comment)

[1] Mike Voisin (12-Jul-2008 05:40 PM)

This book belonged to my father, John E. Voisin. He was being trained as a Radar Observer (Bombardment) at Yuma, Arizona as the war ended. This was no doubt in preparation for the planned invasion of Japan.

[2] felipe (14-Dec-2008 12:40 PM)

I fan of radar

[3] G Dale Cartwright (12-Sep-2009 07:20 PM)

I took my training at Boca Raton and Morrison Field in Florida. I flew as a Radar Observer with the 53rd. Weather Recon. Sqdn. USAAC and later the 373rd. Long Range Weather Sqdn. This Radar Equipment was very good, but in the early days the Pilots didn't have much faith in it.

[4] Peter Boczar (27-Sep-2009 12:17 AM)

I've been researching my missing uncle Larry Grasha whose unit, 3rd Sea Search Attack Squadron, was testing a lot of radar equipment. He was reassigned to something called project AQ7 located at Morrison Field. However, his plane went missing enroute to Belem, Brazil. There were two radar techinicians on board named Benjamin Evans and Louis Enderle. Can anyone tell me what was AQ7. Did anyone serve with these men? Many thanks.

[5] Robert Langille (14-Feb-2010 09:31 PM)

Hi Mike,
Nice site. Would you have any docs related to ECM (Electronic Countermeasures)? Looking for info on DBM-1 and TDY-1 along with other types of jammers or EW equipment.
Any assistance would be greatly appreciated.
Kind Regards
Ottawa, Ontario, Canada

[6] Mike Voisin (15-Feb-2010 08:55 AM)

Hi Robert, I do not have any documents that reference electronic countermeasure equipment yet. Perhaps someone will contribute such material to the collection in the future.

[7] THOMAS G HARRISON (07-Aug-2012 04:41 PM)


[8] caesar BINGO benigno (24-Jan-2013 02:01 AM)

hi if you are interested i was a graduate of the UK ECM school at chedddington air base dec 1944 i flew 20 odd missions in a B 17 assg to 452nd bm gp. the equipment i used was a APR 4 and a APT 1. my last assignment, was a Boeing test team member at Edwards AFB 1986=1989, on the B-1 evalating the ecm capabilities of the B-1. caesar benigno Col USAF/ ret

[9] Mike (22-Jan-2014 10:35 AM)

My farther was a radar observer-mechanic Bombardment 2867. Does anyone know what he would have done in the position. Would he have been a crew member on a bomber or what? Thanks

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Curator: Mike Voisin

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Army Air Forces Collection Item 000023 is licensed by Mike Voisin under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.

Revised: September 15, 2017
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