SSTV - Revision history

KJ7RRV at 19:08, 5 December 2023

2023-12-05T19:08:11Z

← Older revision		Revision as of 12:08, 5 December 2023
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	=== iOS and iPadOS ===		=== iOS and iPadOS ===

	An [https://apps.apple.com/us/app/sstv/id387910013 SSTV decoder/encoder app] is available for the iPhone and iPad, but ~~please note that~~ it is a paid app (it currently costs $2.99), and ~~that~~ no PBARC members currently use it, so it may be difficult to find help and it is not known how well it works.		An [https://apps.apple.com/us/app/sstv/id387910013 SSTV decoder/encoder app] is available for the iPhone and iPad, but it is a paid app (it currently costs $2.99), and no PBARC members currently use it, so it may be difficult to find help and it is not known how well it works.

	=== Windows ===		=== Windows ===
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	=== Linux ===		=== Linux ===

	QSSTV is an SSTV program for [[Linux]]. If you are familiar with the process for compiling and installing programs from source code, follow the instructions on [https://github.com/ON4QZ/QSSTV the GitHub repository]. Otherwise, search for "QSSTV' in your ~~distributions~~ software manager.		QSSTV is an SSTV program for [[Linux]]. If you are familiar with the process for compiling and installing programs from source code, follow the instructions on [https://github.com/ON4QZ/QSSTV the GitHub repository]. Otherwise, search for "QSSTV" in your distribution's software manager.

	So far, all PBARC members who have tried to use QSSTV have had various problems with it that made it unusable.		So far, all PBARC members who have tried to use QSSTV have had various problems with it that made it unusable.

	=== MacOS ===		=== MacOS ===

			[https://qsl.net/v/ve3elb/KD6CJI-MultiScan3B/ MultiScan3B] by KD6CJI is available as a free download. The European Space Agency has a [https://www.esa.int/ESA_Multimedia/Videos/2020/07/Mac_OSX_tutorial_How_to_receive_SSTV_pictures_from_the_International_Space_Station video tutorial] installation and use.

	[https://www.blackcatsystems.com/software/multimode.html MultiMode Cocoa] apparently supports several SSTV modes along with some digital modes such as [[PSK31]], but it costs $89 and is not used by any PBARC members, putting it in a similar situation as the iOS app.		[https://www.blackcatsystems.com/software/multimode.html MultiMode Cocoa] apparently supports several SSTV modes along with some digital modes such as [[PSK31]], but it costs $89 and is not used by any PBARC members, putting it in a similar situation as the iOS app.
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	{{Wikipedia\|Slow-scan television}}		{{Wikipedia\|Slow-scan television}}

			<p>This page contains content copied from or based on the OpenHam.Wiki article "[https://openham.wiki/index.php/Slow-scan_television Slow-scan television]." Copyright © OpenHam.Wiki contributors. Used under [https://creativecommons.org/licenses/by-sa/4.0/ CC BY-SA 4.0 International].<p>

KJ7RRV at 19:20, 18 November 2023

2023-11-18T19:20:31Z

← Older revision		Revision as of 12:20, 18 November 2023
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	290 seconds (4 minutes 50 seconds) per picture		290 seconds (4 minutes 50 seconds) per picture

	~~{{CC BY-SA}}~~		<hr>

	{{Wikipedia\|Slow-scan television}}		{{Wikipedia\|Slow-scan television}}

KJ7RRV at 23:05, 4 July 2023

2023-07-04T23:05:00Z

← Older revision		Revision as of 16:05, 4 July 2023
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	'''Slow-scan television (SSTV)''' ~~refers~~ to ~~any method of sending still pictures~~ over amateur radio. ~~Although~~ the ~~vast majority of SSTV activity today uses computers for modulation~~ and ~~demodulation (similar to many [[digital]] modes)~~, ~~most SSTV modes are technically analog~~.		'''Slow-scan television (SSTV)''' allows you to send photos and other images over amateur radio. A phone or computer converts the picture into sound waves, which are sent over a radio. When another operator's radio receives these signals and their phone or computer decodes them, the image appears on the recipient's screen.

	A more general term for technologies including SSTV is narrowband television (NBTV). Analog broadcast television requires at least 6~~ ~~MHz wide channels, because it transmits 25 or 30 picture frames per second, but SSTV usually only takes up to a maximum of 3~~ ~~kHz of bandwidth. It is a much slower method of transmission than broadcast television, usually taking from about eight seconds to a couple of minutes, depending on the mode used, to transmit one image frame. Because of this, it is used for still images, not video. (Other NBTV systems, which are less commonly used, transmit video, but at very low resolution.)		A more general term for technologies including SSTV is narrowband television (NBTV). Analog broadcast television requires at least 6 MHz wide channels, because it transmits 25 or 30 picture frames per second, but SSTV usually only takes up to a maximum of 3 kHz of bandwidth. It is a much slower method of transmission than broadcast television, usually taking from about eight seconds to a couple of minutes, depending on the mode used, to transmit one image frame. Because of this, it is used for still images, not video. (Other NBTV systems, which are less commonly used, transmit video, but at very low resolution.)

	~~Since~~ SSTV ~~systems operate on~~ voice ~~frequencies~~, they can be used with most amateur transceivers, including on [[HF]], [[VHF]] and [[UHF]].		Because SSTV signals are comparable in [[Glossary#bandwidth\|bandwidth]] to voice signals, they can be used with most amateur transceivers, including on [[HF]], [[VHF]] and [[UHF]].

	Most SSTV operators today use a personal computer and special software in place of much of the custom equipment formerly necessary. The sound card of a PC, with special processing software, acts as a modem. The computer screen provides the output. A digital camera or saved digital photos provide the input. More recently, it is possible to use an [[Android]] smartphone or tablet for SSTV. This can be very convenient, because the camera is integrated into the device and can be easily moved and pointed. This could be especially useful for emergency communications; it is possible to send an image over several miles in only two or three minutes using nothing more than a smartphone and an [[HT]].		Most SSTV operators today use a personal computer and special software in place of much of the custom equipment formerly necessary. The sound card of a PC, with special processing software, acts as a modem. The computer screen provides the output. A digital camera or saved digital photos provide the input. More recently, it is possible to use an [[Android]] smartphone or tablet for SSTV. This can be very convenient, because the camera is integrated into the device and can be easily moved and pointed. This could be especially useful for emergency communications; it is possible to send an image over several miles in only two or three minutes using nothing more than a smartphone and an [[HT]].

KJ7RRV: KJ7RRV moved page Slow-scan Television to SSTV

2023-06-28T22:22:37Z

KJ7RRV moved page Slow-scan Television to SSTV

← Older revision	Revision as of 15:22, 28 June 2023
(No difference)

KJ7RRV-bot: License cleanup

2023-06-12T17:27:28Z

License cleanup

← Older revision		Revision as of 10:27, 12 June 2023
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	{{CC BY-SA}}{{Wikipedia\|Slow-scan television}}		{{CC BY-SA}}

			{{Wikipedia\|Slow-scan television}}

KJ7RRV-bot: Removing categories

2023-06-12T16:36:06Z

Removing categories

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	{{CC BY-SA}}{{Wikipedia\|Slow-scan television}}		{{CC BY-SA}}{{Wikipedia\|Slow-scan television}}
	~~[[Category:Digital]]~~
	~~[[Category:Training]]~~
	~~[[Category:SSTV]]~~

KJ7RRV at 23:46, 10 June 2023

2023-06-10T23:46:54Z

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	~~{{WikipediaCopyright\|Slow-scan_television\|Slow-scan television\|1076510879\|11 March 2022\|2002-2022\|2022-2023}}~~

			{{CC BY-SA}}{{Wikipedia\|Slow-scan television}}
	[[Category:Digital]]		[[Category:Digital]]
	[[Category:Training]]		[[Category:Training]]
	[[Category:SSTV]]		[[Category:SSTV]]

KJ7RRV: /* Linux */

2023-04-12T22:33:31Z

Linux

← Older revision		Revision as of 15:33, 12 April 2023
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	QSSTV is an SSTV program for [[Linux]]. If you are familiar with the process for compiling and installing programs from source code, follow the instructions on [https://github.com/ON4QZ/QSSTV the GitHub repository]. Otherwise, search for "QSSTV' in your distributions software manager.		QSSTV is an SSTV program for [[Linux]]. If you are familiar with the process for compiling and installing programs from source code, follow the instructions on [https://github.com/ON4QZ/QSSTV the GitHub repository]. Otherwise, search for "QSSTV' in your distributions software manager.

			So far, all PBARC members who have tried to use QSSTV have had various problems with it that made it unusable.

	=== MacOS ===		=== MacOS ===

KJ7RRV: /* Android */

2023-03-07T19:27:13Z

Android

← Older revision		Revision as of 12:27, 7 March 2023
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	On Android, the transmit and receive functions are provided by separate apps. The encoder, simply called "SSTV Encoder," is available on the [https://play.google.com/store/apps/details?id=om.sstvencoder Google Play Store] and on [https://f-droid.org/packages/om.sstvencoder F-Droid]. (If you're not sure which link to use, use the Play Store.) The decoder is called "Robot36"; despite the name, it supports many different modes. It is also available from the [https://play.google.com/store/apps/details?id=xdsopl.robot36 Play Store] and from [https://f-droid.org/packages/xdsopl.robot36 F-Droid].		On Android, the transmit and receive functions are provided by separate apps. The encoder, simply called "SSTV Encoder," is available on the [https://play.google.com/store/apps/details?id=om.sstvencoder Google Play Store] and on [https://f-droid.org/packages/om.sstvencoder F-Droid]. (If you're not sure which link to use, use the Play Store.) The decoder is called "Robot36"; despite the name, it supports many different modes. It is also available from the [https://play.google.com/store/apps/details?id=xdsopl.robot36 Play Store] and from [https://f-droid.org/packages/xdsopl.robot36 F-Droid].

			Air link works fine with Android devices, and it is much more convenient than with a laptop or (especially) a desktop. However, with a "USB On-The-Go" adapter, many phones and tablets will work with the SignaLink.

	==== Sending pictures ====		==== Sending pictures ====

KJ7RRV: /* Android */

2023-03-07T19:18:40Z

Android

← Older revision		Revision as of 12:18, 7 March 2023
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	On Android, the transmit and receive functions are provided by separate apps. The encoder, simply called "SSTV Encoder," is available on the [https://play.google.com/store/apps/details?id=om.sstvencoder Google Play Store] and on [https://f-droid.org/packages/om.sstvencoder F-Droid]. (If you're not sure which link to use, use the Play Store.) The decoder is called "Robot36"; despite the name, it supports many different modes. It is also available from the [https://play.google.com/store/apps/details?id=xdsopl.robot36 Play Store] and from [https://f-droid.org/packages/xdsopl.robot36 F-Droid].		On Android, the transmit and receive functions are provided by separate apps. The encoder, simply called "SSTV Encoder," is available on the [https://play.google.com/store/apps/details?id=om.sstvencoder Google Play Store] and on [https://f-droid.org/packages/om.sstvencoder F-Droid]. (If you're not sure which link to use, use the Play Store.) The decoder is called "Robot36"; despite the name, it supports many different modes. It is also available from the [https://play.google.com/store/apps/details?id=xdsopl.robot36 Play Store] and from [https://f-droid.org/packages/xdsopl.robot36 F-Droid].

			==== Sending pictures ====

			To send a picture, use the "SSTV Encoder" app.

			First, tap the three-dot menu, then tap "Modes" and select a mode. PD90 is a good compromise between image quality and transmission time; it takes 90 seconds.

			Tap the photo frame button and select an image. (The camera button should allow pictures to be taken from within the app, but this feature is buggy. It is better to take a picture with the normal camera app first.) Zoom and drag the picture as desired; the part within the frame will be transmitted.

			Tap anywhere within the frame to add text at that location; an editor will open in which you can enter text and change the font size, style, and color. Click the check mark when you are done. If you want to edit text that is already on the image; tap the text, and the editor will open with that text pre-loaded. When you click the checkmark, it will save the edit. To remove text, simply edit it and remove all of the text; you can use the X icon to do this.

			To send the image, turn your media volume up and tap the "play" icon.

	=== iOS and iPadOS ===		=== iOS and iPadOS ===