SSTV Info - John Langner WB2OSZ The main focus of this file is on SSTV because information on this mode is so scarce. I keep trying to ignore WEFAX and ATV because they are even larger topics already well covered by various handbooks and magazines. However some WEFAX and ATV information sneaks in when it is closely related to SSTV, for instance some software that does both SSTV and WEFAX. I've tried to keep everything objective and resisted the temptation to add comments (mine or second hand) about the quality of the products. Someone flamed me for saying it was "sort of possible" to do SSTV with a certain multi-mode TNC. So all I'll say is get on the air and ask people what they are using how they like it. Detailed specifications and prices have been avoided because that could be considered advertising and this is going over the Internet and other places where advertising is not welcome. Please send additions and corrections to johnl@avs.com and I'll distribute a new version occasionally. A fairly recent version will always be available in /pub/ham-radio/sstv_wefax_info at ftp.cs.buffalo.edu. Let me know where you saw this file; I'd be interested in knowing how far it gets propagated. Version of mid October 1992. Background ---------- There are several different ways to send images over ham radio: 1. RTTY art - Remember when people were amused by making pictures out of characters? 2. FSTV (Fast Scan TV - Also called ATV) - Similar to broadcast TV. Full motion, color, sound, etc. Restricted to UHF and up because a signal requires several MHz of bandwidth. 3. WEFAX (weather facsimile) - Very high resolution gray scale images sent by audio tones over a period of minutes. 4. SSTV (Slow Scan TV) - Low to medium resolution still images sent through audio channels over a period of several seconds to a few minutes. Mostly color these days. 5. Digital SSTV - I haven't seen any proposals yet. You could always compress images using an international standard, such as JPEG, and send the files over existing packet radio networks. Transmission Modes ------------------ The original 8 second SSTV transmission mode (around 1958) had the following characteristics: black = 1500 Hz white = 2300 Hz gray levels in between 120 scan lines 15 lines per second 5 mS of 1200 Hz for horizontal sync 30 mS of 1200 Hz for vertical sync Since that time many more modes have been invented, sometimes to add new capabilities, sometimes the result of Not Invented Here syndrome. The major groups are: Robot - Introduced with the Robot scan converters (California). Wraase - Introduced with the Wraase scan converters (Germany). Martin - Developed by Martin Emmerson (England). First available as replacement PROMs for Robot 1200C. Scottie - Developed by Eddie Murphy (Scotland). First available as replacement PROMs for Robot 1200C. AVT - Developed by Ben Blish/Williams (Montana). First available in the AVT system. The Robot, Wraase, Martin, and Scottie modes are all closely related. They all use the tones above for black, white, and gray levels. They all have 1200 Hz horizontal sync, although some Martin and Scottie implementations rely on accurate crystal oscillators and ignore the horizontal sync once synchronized. Color is generally transmitted by sending each scan line 3 times, once each for red, green, and blue components. Robot is different from the rest in that it encodes colors with luminance (Y) and chrominance (R-Y and B-Y) instead of R,G,B. Each of these modes has a few different speeds, usually providing 120 or 240 scan lines and varying degrees of horizontal resolution. (Actually some send 128 or 256 lines but the top 8 or 16 are always a fixed gray scale, leaving 120 or 240 usable lines.) The Robot modes have a much longer vertical sync (called VIS) containing 7 bits of information and a parity bit. This identifies the format of the following image so manual selection is not required on systems that recognize it. Everyone else has adopted the Robot VIS coding and assigned themselves unused codes in the original specification. The AVT mode is radically different from the rest. It has no horizontal sync at all; very accurate crystal oscillators are required to prevent slanted pictures. After the usual Robot VIS code, it has a digital header with 32 repetitions of the transmission mode, and a sequence number. It is only necessary to receive one of the 32 groups correctly to achieve synchronization. For more details see the AVT article in CQ-TV mentioned in the bibliography. Frequencies ----------- By convention, SSTV operation is generally found on only a few frequencies. >From a brochure from the International Visual Communication Association: 3.845 7.171 14.230 14.233 21.340 28.680 144.5 Nets ---- Two different Slow Scan nets meet on Saturdays at 15:00 and 18:00 UTC on 14.230 MHz. Scan Converters --------------- A couple years ago anyone who was serious about SSTV had a Robot 1200C. It is a complete system dedicated to SSTV. Just connect it to - Color TV camera (either NTSC or PAL). - Color TV set or monitor. - Speaker and Mic connectors of a transceiver. - Tape recorder for picture storage. It has 4 black & white modes (one compatible with original 8 second) and 4 color modes with different transmission times and resolutions. It displays images with 256 x 240 resolution with 18 bits per pixel. That's more than 250,000 colors. Robot Research 5636 Ruffin Road San Diego, CA 61927 It also has a parallel port for connection to a home computer. Several different programs for transferring images to/from the 1200C and for performing various other functions are available. (Combined list from Roland's column, IVCA brochure, etc.) Hi-Res (for IBM PC) Tom Jenkins N9AMR 5968 S. Keystone Ave. Indianapolis, IN 46227 SCAN, Version 6.0 (for IBM PC) Bert Beyt W5ZR 301 Tampico St. New Iberia, LA 70560 SSTV by KC5VC (for IBM PC) Garnet Bebermeyer WB0UNB 15 Almeda Ct. Fenton, MO 63026 IMAGE (for IBM PC) Dick Isely WD9GIG 736 Fellow St. St. Charles, IL 60174 name? (for Amiga) Tom Hibben KB9MC Mule Hollow Road Box 188 DeSoto, WI 54624 Replacement PROMs are available to give the 1200C other transmission modes such as Wraase, Martin, Scottie, and AVT. PROMs available from: Martin Emmerson G3OQD 6 Mount Hurst Rd. Hayes, Bromley Kent, England Robot Research has lost interest in the 1200C. It hasn't been enhanced or advertised for years. The last I heard it is still available from P.C. Electronics but they never mention it in their full page ads (need to dig up address...). Three clones of the 1200C are available: Ribbit Brian Summers VE3DUO 336 Goodram Drive Burlington, Ontario Canada L7L 2K1 LM9000 John Wilson VK3LM R.M.B. 4201A Tallangatta Valley 3701 Victoria Australia NS-88 Muneki Yamafuzi JF3GOH P.O. Box 670 Osaka Japan 531 I think the LM9000 is available only as blank PC boards. One magazine article warned readers not to be too hasty about purchasing boards because the other parts required are hard to find and more expensive than you would expect. But if you do build one it is compatible with the 1200C and can use the Martin Emmerson PROMs. The Wraase SC-1 and SC-2 scan converters are available from Germany. I know nothing at all about their capabilities. One magazine mentioned that they existed but went into no additional detail. Volker Wraase Elektronik Kronsberg 10 D-2300 Altenholz/Kiel Germany Tel.: 0431/32528 A new scan converter was just announced recently, the SUPERSCAN 2001. It is similar to the 1200C but a more modern design with several improvements. It can hold four 256x256 images with about 250,000 colors. New features include mouse support, titling without use of a separate computer, both parallel and serial interfaces, and a CMOS RAM with battery backup to save parameters. Now (or soon) available are: * Semi-kit with 3 printed circuit boards, an EPROM developed by Martin Emmerson, and instructions. * High stability crystal oscillator. * Cabinet. * Interface card for IBM PC. The builder must gather up all the other components which go on the boards. Jad Bashour 55 Hampton Road London N15 3SX England Tel. 011 44 81 (809 3991) Home Computers -------------- Now that most home computers have plenty of memory and acceptable color graphics, the most cost effective method is to use a computer with a suitable interface and software. Note that if you want to send a picture of anything real, you will also need a frame grabber which will add a few hundred more $ to the total system cost. Amiga ----- The AVT system has become quite popular during the last couple years for both SSTV and WEFAX. It is composed of an interface that attaches to the parallel port and software. It has images with up to 4096 colors, all the popular transmission modes, builtin graphics editor, text generation, image processing techniques to clean up noisy pictures, and loads of other features. Product review in July 1989 issue of 73 Amateur Radio. AVT Master AEA P.O. Box C2160 2006 196th St. S.W. Lynnwood, WA 98036-0918 Atari ST -------- Color SSTV, WEFAX, and other ham radio software are available from these user group program libraries: Atari Microcomputer Network John Adams KC5FW 17106 Happy Hollow San Antonio, TX 78232 ASTUR (Atari ST Users on Radio) GEERAERT Michel W. Elsschotlann 21 B-8460 Koksijde Belgium The WEFAX program requires a very simple interface containing an XR-2211. The "sSTv" program can use two different interfaces. In the low cost configuration, the internal sound generator is used for transmit and a simple two chip interface (total cost about $7 including perf board, connectors, etc.) is used for receive. Much better results can be obtained with an interface from: A&A Engineering 2521 W. LaPalma, Unit K Anaheim CA 92801 (714) 952-2114 See 73 Magazine, December 89 and January 90, for more details. The latest version of the software has all the popular modes (Robot, Wraase, Martin, Scottie, AVT), a graphical user interface, on-screen tuning indicator, and full screen images with dithering to give the appearance of hundreds of colors when viewed from a distance. Another Atari SSTV system is available from: Robert Gendron VE2BNC 315 6025 Croissant Brodeur Brossard, Longueuil Quebec J4Z 1Y8 Canada IBM PC ------ Several WEFAX systems are available: PC HF Facsimilie 4.0 PC GOES/WEFAX Software Systems Consulting 150 Avenida Cabrillo, "C" San Clemente, CA 92672 MULTIFAX Schwittek WEFAX Systems David E. Schittek NW2T 1659 Waterford Road Walworth, NY 14568 AEA-FAX AEA (address above) A & A Engineering (address above) There are surely others. I found these by flipping through a couple recent magazines. My current main interest is SSTV so I'm not familiar with the features of WEFAX systems. Several months ago, I started this paragraph with "The SSTV picture is dimmer" because there was only a limited B&W system available. The situation has changed rapidly. There are now three PC-based Color SSTV systems available and rumors of at least one more on the way. In order of appearance: ViewPort VGA (developed by KA2PYJ) A & A Engineering (address above) PC SSTV 5.0 Software Systems Consulting (address above) Pasokon TV John Langner WB2OSZ 115 Stedman St. #F Chelmsford, MA 01824-1823 (please send SASE for details) All systems use much different interfaces: a small module that plugs into the serial port, a more substantial interface that attaches to the printer port, and a board that fits into an expansion slot inside the computer. All send/receive a variety of modes, read/write popular image file formats, and require a VGA. But there the similarities end. They vary quite a bit in number of transmission modes supported, maximum number of colors displayed, ease of setup, and other features. To avoid any unpleasant surprizes, tune into 14.230, and ask people about their experiences with the different systems before making any decisions about a purchase. Mac --- Many people have asked many times and there doesn't seem to be anything available. Others ------ There have been SSTV implementations for other machines such as the Radio Shack COCO and the old 8 bit Ataris. (See Bibliography, below.) CQ-TV also mentions SSTV for machines we never heard of in the USA. Multi-mode TNCs --------------- It is possible to do color SSTV with the MFJ-1278, a computer, and suitable software. John (??? callbook says Robert E.) Tuttle K1UTI Penny Ln Barrington, NH 03825 Software Avaiable by FTP over Internet -------------------------------------- If you don't have Internet access, consult the FAQ list for information on how to get these files by e-mail. SSTVFAX2.ZIP Hams: Send and Receive SSTV and FAX pictures JVFAX50.ZIP very good program to encode and decode FAX/SSTV/ASCII.. WEFAX.ARC ? NEWWEFAX.ARC ? AUTOFAX.LZH ? FAX40.LZH ? (Most of the jvfax50.zip locations from VE2IMS. Others from archie.) Host capella.eetech.mcgill.ca Location: /wuarchive/mirrors/msdos/hamradio FILE -rw-r--r-- 407934 Jun 28 20:00 jvfax50.zip Location: /wuarchive/mirrors3/garbo.uwasa.fi/ham FILE -r--r--r-- 408165 Jun 24 13:41 jvfax50.zip Host garbo.uwasa.fi Location: /pc/ham FILE -rw-rw-r-- 408165 Jun 24 17:41 jvfax50.zip Host isfs.kuis.kyoto-u.ac.jp Location: /mirrors/simtel20.msdos/hamradio FILE -rw-rw-r-- 407934 Jun 29 05:00 jvfax50.zip Host nic.switch.ch Location: /mirror/msdos/hamradio FILE -rw-rw-r-- 407934 Jun 28 22:00 jvfax50.zip Host pc.usl.edu Location: /pub/ham FILE -rw-r--r-- 407934 Jul 2 11:24 jvfax50.zip Host plaza.aarnet.edu.au Location: /micros/pc/garbo/pc/ham FILE -r--r--r-- 408165 Jun 24 17:41 jvfax50.zip Location: /micros/pc/oak/hamradio FILE -r--r--r-- 407934 Jun 28 20:00 jvfax50.zip Location: /micros/pc/simtel-20/hamradio FILE -r--r--r-- 407934 Jun 28 20:00 jvfax50.zip Host rigel.acs.oakland.edu Location: /pub/msdos/hamradio FILE -rw-r--r-- 407934 Jun 28 20:00 jvfax50.zip Host src.doc.ic.ac.uk Location: /ibmpc/wsmr-simtel20.army.mil/hamradio FILE -r--r--r-- 407934 Jun 28 21:00 jvfax50.zip Host sun0.urz.uni-heidelberg.de Location: /pub/msdos/simtel/hamradio FILE -rw-rw-r-- 407934 Jun 28 20:00 jvfax50.zip Host swdsrv.edvz.univie.ac.at Location: /pc/dos/hamradio FILE -rw-r--r-- 407934 Jun 28 19:00 jvfax50.zip Host wuarchive.wustl.edu Location: /mirrors/msdos/hamradio FILE -rw-r--r-- 407934 Jun 28 19:00 jvfax50.zip Location: /mirrors3/garbo.uwasa.fi/ham FILE -r--r--r-- 408165 Jun 24 12:41 jvfax50.zip Host garfield.catt.ncsu.edu (152.1.43.23) Last updated 06:01 9 Jul 1992 Location: /pub/hamradio/programs FILE rw-r--r-- 28323 Jun 18 12:00 sstvfax2.zip Host wuarchive.wustl.edu (128.252.135.4) Last updated 04:16 10 May 1992 Location: /mirrors/msdos/hamradio FILE rw-rw-r-- 28323 Apr 30 19:00 sstvfax2.zip Host gdr.bath.ac.uk (138.38.32.1) Last updated 07:03 9 Jul 1992 Location: /pdsoft/msdos/hamradio FILE rw-r--r-- 35968 Sep 7 1987 wefax.arc Host garfield.catt.ncsu.edu (152.1.43.23) Last updated 06:01 9 Jul 1992 Location: /pub/hamradio/programs FILE rw-r--r-- 35968 Jun 18 12:01 wefax.arc Host caticsuf.cati.csufresno.edu (129.8.100.15) Last updated 03:48 22 Jun 1992 Location: /pub/ham-radio/radio/progs FILE rw-r--r-- 35968 Nov 12 1991 wefax.arc Host wuarchive.wustl.edu (128.252.135.4) Last updated 04:16 10 May 1992 Location: /mirrors/msdos/hamradio FILE rw-rw-r-- 35968 Sep 6 1987 wefax.arc Host ucsd.edu (128.54.16.1) Last updated 03:39 8 May 1992 Location: /hamradio/dsp FILE r--r--r-- 41110 Aug 10 1988 wefax.arc Host sun0.urz.uni-heidelberg.de (129.206.100.126) Last updated 17:54 5 May 1992 Location: /pub/msdos/simtel/hamradio FILE rw-rw-r-- 35968 Sep 6 1987 wefax.arc Host src.doc.ic.ac.uk (146.169.2.1) Last updated 17:24 5 May 1992 Location: /ibmpc/wsmr-simtel20.army.mil/hamradio FILE r-xr-xr-x 35968 Sep 6 1987 wefax.arc Host rigel.acs.oakland.edu (141.210.10.117) Last updated 16:46 5 May 1992 Location: /pub/msdos/hamradio FILE rw-r--r-- 35968 Sep 6 1987 wefax.arc Host plaza.aarnet.edu.au (139.130.4.6) Last updated 16:16 5 May 1992 Location: /micros/pc/simtel-20/hamradio FILE rw-r--r-- 35968 Sep 6 1987 wefax.arc Location: /micros/pc/oak/hamradio FILE rw-r--r-- 35968 Sep 6 1987 wefax.arc Host nic.funet.fi (128.214.6.100) Last updated 15:36 5 May 1992 Location: /pub/ham/dsp/dsp4 FILE rw-rw-r-- 41110 Mar 1 1990 wefax.arc Host ucsd.edu (128.54.16.1) Last updated 03:39 8 May 1992 Location: /hamradio/dsp FILE r--r--r-- 70742 Aug 10 1988 newwefax.arc Host nic.funet.fi (128.214.6.100) Last updated 15:36 5 May 1992 Location: /pub/ham/dsp/dsp12 FILE rw-rw-r-- 70742 Mar 1 1990 newwefax.arc Location: /pub/msdos/communications/hamradio FILE rw-r--r-- 10500 Sep 21 1990 autofax.lzh FILE rw-r--r-- 202198 Jan 16 09:22 fax40.lzh Host garfield.catt.ncsu.edu (152.1.43.23) Last updated 06:01 9 Jul 1992 Location: /pub/hamradio/programs FILE rw-r--r-- 208740 Jun 18 11:56 fax40.zip Host wuarchive.wustl.edu (128.252.135.4) Last updated 04:16 10 May 1992 Location: /mirrors/msdos/hamradio FILE rw-rw-r-- 208740 Jan 10 18:00 fax40.zip Host sun0.urz.uni-heidelberg.de (129.206.100.126) Last updated 17:54 5 May 1992 Location: /pub/msdos/simtel/hamradio FILE rw-rw-r-- 208768 Jan 11 12:00 fax40.zip Host src.doc.ic.ac.uk (146.169.2.1) Last updated 17:24 5 May 1992 Location: /ibmpc/wsmr-simtel20.army.mil/hamradio FILE r--r--r-- 208740 Jan 10 19:00 fax40.zip Host rigel.acs.oakland.edu (141.210.10.117) Last updated 16:46 5 May 1992 Location: /pub/msdos/hamradio FILE rw-r--r-- 208740 Jan 10 19:00 fax40.zip Host plaza.aarnet.edu.au (139.130.4.6) Last updated 16:16 5 May 1992 Location: /micros/pc/simtel-20/hamradio FILE rw-r--r-- 208740 Jan 10 19:00 fax40.zip Location: /micros/pc/oak/hamradio FILE rw-r--r-- 208740 Jan 10 19:00 fax40.zip Host nic.funet.fi (128.214.6.100) Last updated 15:36 5 May 1992 Location: /pub/msdos/communications/hamradio FILE rw-r--r-- 208740 Jan 16 07:36 fax40.zip FILE rw-r--r-- 30628 Sep 21 1990 wefax.lzh Host garfield.catt.ncsu.edu (152.1.43.23) Last updated 06:01 9 Jul 1992 Location: /pub/hamradio/programs FILE rw-r--r-- 28323 Jun 18 12:00 sstvfax2.zip Host wuarchive.wustl.edu (128.252.135.4) Last updated 04:16 10 May 1992 Location: /mirrors/msdos/hamradio FILE rw-rw-r-- 28323 Apr 30 19:00 sstvfax2.zip Host garbo.uwasa.fi (128.214.87.1) Last updated 05:54 9 Jul 1992 Location: /pc/ham FILE rw-rw-r-- 408165 Jun 24 17:41 jvfax50.zip Software Available from phone BBSs ---------------------------------- ??? Publications ------------ Modern information on SSTV is very scarce. The only SSTV handbook, that I know about, was written by Don Miller W9NTP and Ralph Taggart WB8DQT about 15 years ago. The British Amateur Television Club has a book, The Slow Scan Companion (?), but it's not really a handbook with organized chapters on different topics. It's more like a random collection of magazine articles. It is missing very fundamental information such as how color images are conveyed by audio tones. There are a few magazines that specialize in Amateur Television. These are mostly oriented toward fast scan TV but SSTV and WEFAX are mentioned occasionally. (Regular column on 'Satellites, Facsimile & Slow-Scan TV Imaging' by Fred Sharp W8ASF) The SPEC-COM Journal P.O. Box 1002 Dubuque, IA 52004-1002 (Frequent column 'SSTV Revisited' by Roland Humphries G4UKL) CQ-TV British Amateur Television Club Dave Lawton G0ANO Grenehurst, Pinewood Road High Wycombe, Bucks HP12 4DD England (U.S. subscriptions may be obtained by making payment through Wyman Research or ATVQ.) Amateur Television Quarterly (ATVQ) 1545 Lee St. Suite 73 Des Plaines, IL 60018 Booklets of old ATVQ and A5 articles are available from: ESF Copy Service 4011 Clearview Dr. Cedar Falls, IA 50613 A newsletter devoted to SSTV: VISION International Visual Communication Association (IVCA) 101 Oenoke Lane New Canaan, CT 06840 The 1993 ARRL Radio Amateur's Handbook will have a completely new and expanded section on SSTV. It's not out yet because this is the middle of 1992. Bibliography ------------ It will take some time to track down more old articles for this section. But it won't take long to type them in because there aren't many! I've purposely excluded the scores of articles describing modifications to the Robot 400 (an old Black & White only system) because they're all in the booklets from ESF and of little interest to someone without a Robot 400. Abrams, Clay K6AEP & Taggart, Ralph WB8DQT, "Color Computer SSTV", 73, Nov 84, p. 10 & Dec 84, p. 18. Cameroni, Giuseppe I2CAB & Morellato, Giancarla I2AED (translated by Jim Grubbs K9EI), "get on SSTV - with the C-64", ham radio, Oct. 86, p 43. Churchfield, Terry K3HKR, "Amiga AVT System", 73 Amateur Radio, Jul 89, p. 29. Goodman, Dick WA3USG, "SSTV with the Robot 1200C Scan Converter and the Martin Emmerson EPROM Version 4.0", 73 Amateur Radio Today, Jul 91, p. 46. Langner, John WB2OSZ, "Color SSTV for the Atari ST", 73 Amateur Radio, Dec 89, p. 38, Jan 90, p. 41. Langner, John WB2OSZ, "SSTV - The AVT System Secrets Revealed", CQ-TV 149 (Feb 90), p. 79. Montalbano, John KA2PYJ, "The ViewPort VGA Color SSTV System", 73, Aug 92, p. 8. Rogers, Buck K4ABT (???) - I heard that the August (?) 92 issue of CQ had a product review of PC SSTV 5.0 but the next issue was already out by the time I had a chance to make a trip to a big book store. Schick, Martin K. KA4IWG, "Color SSTV and the Atari Computer", QST, Aug 85. Taggart. Dr. Ralph E. WB8DQT, "The Romscanner", QST, Mar 86. p. 21. ARRL Bibliography on Image Communications ----------------------------------------- The following was provided by Ed Hare at ARRL: The ARRL Handbook and the Operating Manual each have a chapter devoted to amateur television. These books are available from ARRL Headquarters or your local amateur dealer. There are two periodicals devoted to amateur television: ATV Quarterly 1545 Lee St Suite 73 Des Plaines IL 60018 SPEC-COM POB 1002 Dubuque IA 52004-1002 Contact these publishers directly for susbscription information. ARRL Bibliography on Image Communications: 1925 May Visible Radio Communication p. 15 (Wilkerson) 4 pages July Television Arrives p. 9 (Bidwell) 6 pages Picture Transmission Permitted p. 37 (Experimenters' Section) 2 pages August Jenkins Experimenters p. 59 1 page November Henkins Machine p. 59 (Hints & Kinks) 1 page December Practical Picture Transmission p. 12 (Dewhirst) 6 pages 1926 January Voss (German) System p. 29 2 pages 1927 November Weather Map Transmission and p. 9 Reception 7 pages (Dewhirst) 1928 May Amateur Television p. 17 (Thomsen) 2 pages August Some More about Amateur Television p. 30 (Westman) 2 pages September Radiovision p. 15 (Dewhirst) 4 pages Synchronism p. 30 (Jenkins) 1 page October Amateur Television Waves p. 8 1 page 1929 March What Price Television p. 48 (Sleeper) 3 pages June Photo-Electric Cells & Methods p. 17 of Coupling to Vacuum Tubes 6 pages (Dewhirst) 1937 December Radio Amateurs in the Television p. 8 Picture 4 pages (Lamb) December Introduction to Modern Television p. 11 (Wilder) 6 pages 1938 January Circuit Elements in Modern p. 31 Television Reception 5 pages (Wilder) February Sweep Circuit Considerations in p. 38 the Television Receiver 5 pages (Wilder) March A Universal Test Unit for the Study p. 37 of Television Images 3 pages (Wilder) April Construction of Television Receivers p. 23 Part I 5 pages (Wilder) May Construction of Television Receivers p. 39 Part II 4 pages (Wilder) October Building Television Receivers with p. 21 Standard Cathode-Ray Tubes 5 pages (Sherman) December A Practical Television Receiver for p. 21 the Amateur 6 pages (Shumard) 1939 January Construction and Alignment of the p. 45 Television Receiver 9 pages (Shumard) February Using Electro-Magnetic Deflection p. 40 Cathode-Ray Tubes in the Television 6 pages Receiver (Sherman) March An Electrostatic-Deflection p. 52 Kinescope Unit for the Television 4 pages Receiver (Sherman) 1940 February A Deflection and Video Chassis for p. 29 Television Reception 3 pages (Lawrence) March A Design for Living -- With p. 44 Television 4 pages (Rosenblatt) May A New Electronic Television p. 30 Transmitting System for the Amateur 7 pages (Sherman) June A Receiver for the New Amateur p. 38 Television System 6 pages (Sherman) July An Efficient U.H.F. Unit for the p. 32 Amateur Television Transmitter 5 pages (Waller) October Television Camera-Modulator Design p. 11 for Practical Amateur Operation 13 pages (Lamb) Simplifying Television Defection and p. 74 Video Chassis 1 page (Experimenters Section) November Two-Way Television Communication p. 36 Inaugurated 3 pages December New Amateur Television Records p. 53 on 112 Mc. 1 page 1944 May Television in K6 Land p. 42 (Souza) 3 pages December Video Amplifier Design p. 24 (Merritt) 5 pages 1945 November Extended Range Television Reception p. 18 (Wilder) 6 pages 1946 March Military Television Cameras -- and p. 41 the Amateur 4 pages (Middleton) June I.F. Amplifiers in Television p. 62 Receivers 4 pages (Kronenberg) 1950 June Amateur Television -- A Progress p. 11 Report 5 pages (Tilton) 1953 November An Amateur Television Camera p. 10 (Keller) 6 pages 1958 August A Narrow-Band Image Transmission p. 11 System, Part I 7 pages (Macdonald) September A Narrow-Band Image Transmission p. 31 System, Part II 7 pages (Macdonald) 1960 March First Amateur Transatlantic Picture p. 75 Transmission 1 page April Slow-Scan Image Transmission p. 36 (Macdonald) 5 pages May Slow-Scan Tests Coming Up p. 52 (Macdonald) (TC) 2 pages September Amateur Color Transmission p. 13 (Shadbolt) 3 pages 1961 January S.C.F.M. -- Improved System for p. 28 Slow-Scan Image Transmission Part I 5 pages (Macdonald) February S.C.F.M. -- Improved System for p. 32 Slow-Scan Image Transmission Part II 4 pages (Macdonald) August League Seeks "Slow-Scan TV" p. 63 (Happenings) 2 pages 1962 November Amateur TV -- The Easy Way p. 33 (Cambell) 10 pages 1964 March A Compact Slow-Scan TV Monitor p. 43 (Macdonald) 6 pages 1965 February Slow-Scan Via OSCAR III p. 20 (Miller) 1 page June A Slow-Scan Vidicon Camera Part I: p. 11 Performance and Electrical Design 5 pages (Macdonald) July A Slow-Scan Vidicon Camera Part II: p. 15 Mechanical Design 4 pages (Macdonald) August A Slow-Scan Vidicon Camera Part III: p. 24 Setup and Operating Procedures 3 pages (McDonald) 1966 September Twenty-Meter Slow-Scan Tests p. 38 (Report on pictures) 1 page (Macdonald) October Narrow-Band TV Using Pseudo-Random p. 46 Dot Scan 2 pages (Simpson) (TC) (Also see 1/67 TC) 1967 January Pseudo-Random Scanning p. 47 (Macdonald) (TC) 1 page February First Slow-Scan Pictures From p. 77 Antarctica! 1 page November Slow-Scan TV Proposed p. 78 (Happenings) 2 pages 1968 February ARRL Comments on Slow-Scan TV p. 72 (Happenings) 3 pages September Slow-Scan TV Pictures Exchanged p. 71 Between Canada and Sweden 1 page Slow-Scan in the U.S. and Canada p. 80 (Happenings) 1 page Slow-Scan Report p. 84 (FCC Report and Order) 3 pages December Slow-Scan with Regular Vidicons p. 48 (Refers to 1965 series) 1 page (Taggart) (TC) 1969 May U.S.-Europe Two-Way Slow-Scan TV QSO p. 75 (Taggart) 1 page 1970 June Slow-Scan TV Viewing Adapter for p. 46 Oscilloscopes 5 pages (Briles & Gervenack) (Also see 3/72, p. 56 TC) 1971 March A Solid State SSTV Monitor p. 35 (Tschannen) (Feedback 8/71, p.41) 5 pages November Robot Research Model 70 SSTV p. 48 Monitor and Model 80 Camera 4 pages (Recent Equipment) 1972 January What You Always Wanted to Know p. 61 About SSTV 5 pages (Hastings) March More On The SSTV Viewing Adaptor p. 56 For Oscilloscopes 1 page (Refers to 6/70 articles) (Briles & Gervenack) (TC) July A Storage-Tube Monitor for SSTV p. 34 (Smith) 3 pages September Questions and Their Answers on the p. 56 Solid-State SSTV Monitor 2 pages (Tschannen) (TC) (Refers to 3/71) December ATV with Motorola T44 UHF p. 28 Transmitter, Part I 5 pages* (McLeod) 1973 January SSTV Video Inversion and Short Scan p. 42 (Stavrou) (TC) 2 pages February ATV with Motorola T44 UHF p. 36 Transmitter, Part II 8 pages* (McLeod) March A Solid-State SSTV Monitor -- p. 27 Mark II 7 pages (Tschannen) (Feedback 5/73, p. 40) August SSTV Calling Frequencies p. 47 (Macdonald) (TC) 2 pages October A Tuner for ATV Applications p. 34 (Bertini) 3 pages* 1974 April Venue Slo-Scan TV Monitor p. 46 (Recent Equipment) 2 pages (Feedback 5/73, p. 64) July A Character Generator for ATV p. 11 (Ellison) 8 pages 1975 January Practical Ideas for the ATV p. 11 Enthusiast, Part I 5 pages* (O'Hara) February Practical Ideas for the ATV p. 30 Enthusiast, Part II 7 pages* (O'Hara) March SSTV to Fact-Scan Converter, Part I p. 33 (Steber) 8 pages May Slow-Scan to Fast-Scan Converter, p. 28 Part II 10 pages (Steber) _____ * Condensed in Specialized Communications Techniques for the Radio Amateur July A Crystal-Controlled SSTV Sync p. 22 System 5 pages (Tschannen) November TV Backdrop p. 42 (H&K) 1 page December A Tuning Aid for SSTV p. 38 (Hall) 3 pages 1976 May 450 MHz ATV Repeaters p. 45 (FM Repeater News) 1 page November SSTV Image Processing p. 13 (Steber) 4 pages 1977 February Using Still-Camera Lenses on SSTV p. 44 Cameras 1 page (H&K) 1978 April QST p. 22 Go ATV with This Transceiver 5 pages October QST p. 30 Medium-Scan Television -- A New Frontier October QST p. 25 SSTV Pictures from Your Microcomputer 1980 January QST p. 36 The Microprocessor and Slow-Scan Television (Feedback: Feb., p. 17) February QST p. 27 Medium-Scan Television Update November QST p. 11 SSTV in Colour 1981 January QST p. 11 Low-Cost Conversion of the Robot 5 pages 400 to Color June QST p. 11 All About Amateur Television 4 pages (Feedback: Sept 1981, p. 51) 1982 March QST p. 59 FAX and TV Permitted in Additional Frequency Bands June QST p. 15 A Compatible Slow-Scan Color Television System August QST p. 24 Care and Feeding of Linear 5 pages Amplifiers for ATV December QST p. 53 PAL SSTV? (color SSTV compatibility) 1983 June QST p. 11 SSTV Today August QST p. 11 High-Resolution SSTV 1984 April QST p. 44 Computerized ATV 1985 August QST p. 13 Color SSTV and the Atari Computer 4 pages QST p. 25 The VIP: A VIC Image Processor 7 pages QST p. 32 The ATV'ers Amazing Little Grey Box 2 pages December QST p. 14 In Search of the Perfect Picture 4 pages 1986 January QST p. 18 In Search of the Perfect Picture 7 pages March QST p. 21 The ROM Scanner (SSTV) 7 pages Summary ------- Most people are scared away from trying SSTV because they think it HAS TO be expensive. That WAS true but it's not anymore. With 3 or 4 new color SSTV systems for use with the IBM PC, 1992 will be the year that SSTV really takes off. The members and HQ staff would like to thank the following people for their contributions to this information file: John Langner WB2OSZ Send any additional information or changes to mtracy@arrl.org. 73 from ARRL HQ.