|Media type||Magnetic Tape|
|Encoding||NTSC, PAL, SECAM|
|Capacity||Up to 2 hours (120 Min.)|
|Read mechanism||Helical scan|
|Write mechanism||Helical scan|
|Developed by||Bosch Fernseh|
|Dimensions||1 Inch reel to reel|
1–inch type B VTR (designated Type B by SMPTE) is a reel-to-reel analog recording video tape format developed by the Bosch Fernseh division of Bosch in Germany in 1976. The magnetic tape format became the broadcasting standard in continental Europe, but adoption was limited in the United States and United Kingdom, where the Type C videotape VTR met with greater success.
The tape speed allowed 96 minutes on a large reel (later 120 minutes), and used 2 record/playback (R/P) heads on the drum rotating at 9,000 RPM with a 190-degree wrap around a very small head drum, recording 52 video lines per head segment. A single video frame was recorded across 6 tracks in the tape. The format only allowed for play, rewind and fast forward. Video is recorded on an FM signal with a bandwidth of 5.5 MHz. Three longitudinal audio tracks are recorded on the tape as well: two audio and one Linear timecode (LTC) track. BCN 50 VTRs were used at the 1980 Summer Olympics in Moscow.
The format required an optional, and costly, digital framestore in addition to the normal analog timebase corrector to do any "trick-play" operations, such as slow motion/variable-speed playback, frame step play, and visible shuttle functions. This was because, unlike 1-inch type C which recorded one field per helical scan track on the tape, Type B segmented each field to 5 or 6 tracks per field according to whether it was a 525- (NTSC) or 625- (PAL) line machine.
The picture quality was excellent, and standard R/P machines, digital frame store machines, reel-to-reel portables, random access cart machines (for playback of short-form video material such as television commercials), and portable cart versions were marketed.
- BCR (BCR 40, BCR 50 and BCR 60)was a pre BCN VTR, made with Philips, the large scanner made it not useful,
- BCN40 (1976, record unit with no TBC playback)
- BCN50 (1976, recorder with TBC playback)
- BCN20 (1976, one hour, portable with no TBC playback)
- BCWQ ("L" Unit for BCN20/21, added TBC playback to the portable units)
- Effects control option for digital framestore, for freeze frame, quad split and mirror effects (early digital Special effects).
- BNC51 (recorder with TBC playback, optional Slow motion and visible shuttle)
- BCN5 (261⁄2 pound, portable cart recorder, 40 min.)
- BCN100 (random access 32 multicassette machine, up to 16 hours rec/playback-20 min per tape) Each unit had 3 tape desks with a 21 sec load time each cart. For on air playback and 3 deck editing system
- BCN52 (recorder with Digital TBC playback, with slow motion & visible shuttle)
- BCN21 (lightweight reel to reel portable with no TBC playback, first Composite material VTR)
- BCN53 (recorder with Digital TBC playback, with slow motion & visible shuttle)
- HR-400 : RCA also sold the BCN50 as an HR-400.
Special BCN units
- Ruxton Video in Burbank (1970–1980s) used modified BCNs for 24 Frame playback to TVs used on movie studio sets. Thus the TVs had no flicker when seen on film, due to the film-compatible frame rate. Bill Hogan of Ruxton Ltd received in 1981 an Academy Award for Technical Achievement for his 24frame TV work.
- Image Transform in Universal City, co-founded by Ken Holland, in 1970, used specially modified BCNs to record 24-frame video also, but for their "Image Vision" system. The BCN would record and play back 24-frame video at 10 MHz bandwidth, with twice the standard 525-line NTSC resolution. To record this the headwheel and capstan ran at twice normal speed. Modified 24 frame/s 10 MHz Bosch Fernseh KCK-40 professional video cameras were used on the set. This was a custom pre-HDTV video system. This Image Vision recording could then be recorded to film on a modified 3M Electron Beam film recorder (EBR). Image Transform had modified other gear for this process. At its peak, this system was used to make "Monty Python Live at the Hollywood Bowl" in 1982. This was the first major use of early electronic cinema technology (using wideband high-resolution analog video technology, predating IT-based DI (digital intermediate) post production for film nowadays) using a film recorder for Film out. Electronovision was also a pre-process like Image Vision. Merlin Engineering also worked on the BCN's wide bandwidth, 10 MHz, BCN modification.
- Bell and Howell (later Rank Video Services) used special BCNs for mass VHS duplication. These specially-modified BCN VTRs could play back movies at two times the normal speed. In addition, the sync signals were also were at two times speed as well. For proper playback, the headwheel and capstan also ran at twice normal speed. Specially modified VHS recorders could record this video. In doing this, the duplication plant could output twice the product than normal videocassette duplicating systems.
- Bell and Howell's Data Tape division in Pasadena, California modified BCNs to record high speed data for instrumentation purposes. These instrumentation recordings were mostly used by US government agencies, such as for NASA on the Space Shuttle. This unit could record data from up to 800 sensors.
- Because of the small scanner, BCNs could record even at high g-forces. Hand picked BCN20 VTRs could record at low temperatures, down to -40 °C (-40 °F). This was done at the Olympic Winter Games in Lake Placid (1980) and in Sarajevo (1984).
- Some users modified BCNs to fit 2-hour reels of tape on the BCN, so complete 2-hour movies could fit on one reel of tape. Bosch later made this a factory option, and was designated as BCN LP.
- Bosch also offered SLP BCN, a "long-play" variant of the format. It moved the tape at 1/3 speed so that up to 6 hours could be recorded one reel. The unit has a special head wheel with azimuth head. This was mostly used for time zone tape delay by television networks. With a head wheel change and a switch the unit could be returned to normal play.
- Between 1977 and 1980 the UK Independent Broadcasting Authority (IBA) experimented with a B format machine as part of their researches into digital video broadcasting standards. In April 1980 a machine was exhibited at a meeting of the EBU Technical Committee in London as part of a complete digital studio system based on a proposed video standard based on YUV 12.4.4. The machine is described in a paper in the IBA Technical Review of March 1982 which can be found here  by scrolling down to the item IBA_TechnicalReviews1-24""
- One of the first Digital SDTV VTRs was a non-production prototype BCN deck that could record and play back early type of CCIR 601 digital signals. These three Bosch VTRs paved the way for the later SMPTE D1 VTR standard. In 1985 and 1986 in a Rennes experimental digital studio in France, an experimental all-digital television center was made, it used the two all digital BCN units.
- The BCH 1000 is an analog high-definition television VTR that records and playbacks HD-MAC at 50 frames per second, each at a resolution of 2048×1152. The BCH 1000 was used in the 1992 Summer Olympic Games in Barcelona and 1992 Winter Olympics in Albertville. It used 8 video heads to handle the increased bandwidth requirements of HD-MAC, due to its high resolution.
- 1 Inch open reel to reel analog video system.
- Video scanner rotation 9600 rpm, 150 rps.
- 52 horizontal lines per head.
- Video FM signal at a bandwidth of 5,5 MHz
- Three analog audio tracks: 2 audio tracks and 1 linear timecode track, 0.8mm wide - 30 mils
- One analog control track 0.4mm wide - 15 mils, built into video scanner head.
- Magnetic tape coating on the outside of the videotape reel.
- Studio reel 96 minutes, later 120 minutes
- Portable reel 60 minutes
- Cart reel 20 minutes (BCN5 - BCN100)
- Video scanner wrap 190 deg.
- Video scanner dia. 50.3mm, 2 inches
- Video track length 3.1 inches, 80mm
- Video track gap 40 um, 1.5 mils
- Tape speed 24 cm/sec - 9.5 ips.
- Video head write speed: 24m /sec - 950 ips
- Video track angle 14.3 deg.
- Video track width 160 um - 6.3 mils
- Two video record/play heads at 180 deg. (rotary transformer)
- Two video erase head for insert edits at 180 deg. (rotary transformer)
Some BCN users
The examples and perspective in this article deal primarily with the United States and do not represent a worldwide view of the subject. (December 2010)
- ABC-TV at MCF 
- AME – Hollywood, California
- Aquarius Theater –Hollywood, California
- Astin Moore, Los Angeles, California; see John Astin
- ATC–Buenos Aires, Argentina
- Audio Plus Video – Los Angeles, California and Northvale, New York
- Australian Film & Television School, Sydney (now Australian Film, Television & Radio School)
- Bell and Howell, (Rank Video Services) – Oak Brook, Illinois
- Bell and Howell Data Tape – Pasadena, California
- Cinema Video Processors – Chicago, Illinois
- Complete Post – Hollywood, California
- Cossey Studios – Santa Cruz, California
- Dash Motorcars – Santa Cruz, California
- DC Video – current user – Burbank, California
- Editel – Hollywood, California
- Eesti Televisioon
- Glendale Studios (Outpost Video) – Glendale, California
- Image Transform – Universal City, California
- KCPT – Kansas City, Missouri
- KPAZ-TV – Phoenix, Arizona
- KTBN-TV – Costa Mesa, California
- KTBO-TV – Oklahoma, Oklahoma
- KTBW-TV Tacoma, Washington
- Laser Pacific – Hollywood, California
- Leon Russell – Burbank, California and Tulsa, Oklahoma
- 4MC – Burbank, California
- Measurement Analysis – Torrance, California
- Merlin – Palo Alto, California
- Modern Video Film – Hollywood, California
- National Institutes of Health- Bethesda, Maryland
- Oral Roberts University – Tulsa, Oklahoma
- ORF-Austrian Broadcasting Corporation – Vienna, Austria
- Premore (see Solo Cup Company) – Culver City, California
- Ruxton – Burbank, California
- Spin Physics – San Diego, California
- Starfax – Burbank, California
- STW Channel 9 - Perth, Western Australia
- Technicolor – Newberry Park, California
- The Video Tape Company – North Hollywood, California
- The Videography Studios – West Los Angeles, California
- TV2 in Framersheim, Germany
- Tyne Tees Television, Newcastle UK used the BCN100 cart system for commercial playout
- VDI – Hollywood, California
- Video Business – New York, New York
- Video Pack – New York, New York
- Video Tape Company – Burbank, California
- Vidtronics – Hollywood, California
- WHFT-TV – Pembroke Park, Florida
- WJYL-CD – Louisville, Kentucky
- WTVY – Dothan, Alabama
- Yorkshire Television, Leeds UK used the BCN100 cart system for commercial playout
- ZDF in Mainz, Germany
- Ampex 2 inch helical VTR
- D6 HDTV VTR
- 1 inch type A videotape
- 1 inch type C videotape
- IVC videotape format
- SMPTE Motion Imaging Journal page 289-299, 1981
- watvhistory.com, Shane Nugent Videotape Operations 1974-2004, by ken On April - 8 - 2009
- inkedin.com/ BCN 51 Videotape Recorders, September 20, 2017, Jan Plomp
- inn-archive.com, Bosch BCN 1 inch
- "Videotape | NFSA". Archived from the original on 2019-04-06.
- Magnetic recording: the first 100 years, page 174-175, By Eric D. Daniel, C. Denis Mee, Mark H. Clark
- BNC recorders
- freepatentsonline.com, BCN Patent
- SMPTE, Aug. 25, 2008 Issue, page 2, BCNs at the 1980 Moscow Summer Olympics Moscow
- Society of Motion Picture and Television Engineers, The BCN System for Magnetic Recording of Television Programs by Heinrich L. Zahn1
- The History of Television, 1942 to 2000, page 196, By Albert Abramson, Christopher H. Sterling
- Charles Bensinger, 1981, The Video Guide, page 101
- labguysworld.com Arvin/Echo
- fernsehmuseum.info 1975 – Bosch-Fernseh BCN 20 / BCN 40/50 1" tape
- Echo Science Corp., located in Mountain View, California was a subsidiary of Arvin Industries, Inc., based in Columbus, Indiana, from 1974 to 1981. It was also known as "Arvin/Echo" for short. http://www.referenceforbusiness.com/history2/15/Arvin-Industries-Inc.html
- vtoldboys.com The Bosch/Philips BCR 1" helical scan TVR that was shown in 1973 and preceded the BCN.
- broadcasting101.w BCN 40 (right side) and BCN 50 (left side)
- broadcasting101.ws BCN 50 deck
- broadcasting101.ws Prototype BCN 20 with a Bosch KCR camera
- The history of television, 1942 to 2000 By Albert Abramson, page 183
- adsausage.com BCN 5 and BCN 20 add
- fernsehmuseum.info, BCN-5 photo
- journal.smpte.org .SMPTE, journal page 744, The BCN 100,Oct 1979
- fernsehmuseum.info, BCN-100 photo
- adiomuseum.org BCN 21, with specs
- dyndns.org, Reel To Reel COLLsite BOSCH BCN 21 Gallery
- German page on BCN53,
- Eng. translation by google on BCN53
- RCA TV Equipment Section of The Broadcast Archive, Maintained by: Barry Mishkind, a RCA HR-400
- Oscar Technical Achievement Award, Bill Hogan (II) (Ruxton, Ltd); Richard J. Stumpf (Universal City Studios' Production Sound Department); Daniel R. Brewer (Universal City Studios' Production Sound Department)- For the engineering of a 24-frame color video system.
- imdb.com Academy Awards, Technical Achievement Award, Bill Hogan (II) (Ruxton, Ltd), March 29, 1982, Los Angeles, California
- NewBay Media The Top Guns of Digital Intermediate, January 28, 2004, Ken Holland
- mdb.com Monty Python Live at the Hollywood Bowl
- Tech Review with Al Sturm, April 2011
- 24frame dave.zfx.com BCN history at Image Transform
- Billboard Nov 17, 1979 VHS duplication
- epatents.gov SYSTEM FOR DUPLICATING INFORMATION RECORDED IN SLANTED TRACKS, RANK VIDEO SERVICES AMERICA
- audiosystemsgroup.com Page 129, CONSUMER VIDEO TAPE DUPLICATION TECHNIQUES, A TUTORIAL, by Jim Brown, SOUND ENGINEERING ASSOCIATES CHICAGO, ILL., CONSULTANTS TO BELL AND HOWELL/COLUMBIA PICTURES VIDEO SERVICES
- Sypris Company on Bell and Howell's Data Tape division
- Computerworld Nov. 12, 1975 on Bell and Howell's Data Tape division
- Computerworld May 7, 1975 on Bell and Howell's Data Tape division
- SMPTE Page two on the Lake Placid (1980)
- "NTLPA Gallery - Shared with pCloud".
- journal.smpte.org An Experimental All-Digital Television Center, by D. Nasse1, J. L. Grimaldi2 and A. Cayet3
- The History of Television, 1942 to 2000, By Albert Abramson, Christopher H., page 209.
- journal.smpte.org The World's First All-Digital Television Production,by Michel Oudin, Jan 1, 1987
- Live Production, A Brief Review on HDTV in Europe in the early 90s
- tech.ebu.ch HDTV at 1992 Expo
- tech.ebu.ch Analog HDTV
- journal.smpte.org https://ieeexplore.ieee.org/document/7259044 The World's First All-Digital Television Production, by Michel Oudin, 1987
- BCN specs, chart
- BCNN Specs