Amateur radio, also known as ham radio, has long been a vibrant community of radio enthusiasts who experiment with various modes of communication. One such mode that has captured the imagination of ham radio operators worldwide is Slow Scan Television (SSTV). SSTV allows amateur radio operators to transmit and receive images over the airwaves, adding a visual dimension to their communication. In this article, we explore the world of SSTV in ham radio, its benefits, techniques, and how it fosters a sense of camaraderie among operators, including the exciting transmissions from the International Space Station (ISS).
The Appeal of SSTV in Ham Radio
Amateur radio operators are always seeking new ways to connect and communicate. While voice communication has been the primary mode, SSTV brings an exciting visual element to ham radio. It enables operators to share images, photographs, and even hand-drawn sketches across vast distances, sparking curiosity and creativity within the community.
SSTV facilitates a sense of personalization and individuality in ham radio. Operators can transmit images of their radio setups, antennas, or even snapshots of their surroundings, allowing others to get a glimpse into their world. This visual aspect creates a stronger bond among operators, fostering a sense of community and camaraderie.
Operating SSTV in Ham Radio
To engage in SSTV, ham radio operators needed specialized equipment, and an HF or VHF transceiver capable of transmitting and receiving SSTV signals. Today, a computer or smartphone with SSTV software, along with your radio, is all that is required to process the received audio signals and display the images.
SSTV transmissions typically occur on specific frequencies allocated for the mode. Popular SSTV frequencies include 14.230 MHz, 7.171 MHz, and 3.730 MHz in the HF bands, while 144.500 MHz is commonly used in the VHF band. Ham radio operators tune their radios to these frequencies during designated SSTV events or when they wish to engage in SSTV communication.
Modes and Protocols in SSTV
Various SSTV modes and protocols are employed in ham radio, each with its own characteristics and advantages. The most common modes include Martin 1, Scottie 2, Robot 36, and PD 120. These modes differ in terms of resolution, color depth, and transmission speed.
Amateur radio operators typically select the appropriate mode based on their equipment, signal conditions, and personal preferences. They can experiment with different modes to find the one that best suits their needs and achieves the desired image quality and transmission speed.
SSTV Events, Awards, and ISS Transmissions
The ham radio community organizes SSTV events and contests to encourage participation and celebrate the art of visual communication. During these events, operators strive to exchange SSTV images with as many stations as possible within a specific time frame. These contests enhance the competitive spirit among operators, inspiring them to improve their skills and equipment.
Furthermore, many amateur radio societies and clubs issue awards and certificates to operators who demonstrate proficiency in SSTV. These awards recognize achievements such as transmitting or receiving a certain number of SSTV images, engaging in international SSTV exchanges, or participating in specific SSTV events.
One of the most exciting aspects of SSTV in ham radio is the opportunity to receive transmissions from the International Space Station (ISS). Periodically, the ISS conducts SSTV transmissions, allowing ham radio operators around the world to receive images directly from space. These transmissions create a sense of awe and excitement, as operators capture images of Earth taken from the ISS, showcasing our planet’s beauty from a unique perspective.
The ARISS Program and SSTV from Space
The ARISS (Amateur Radio on the International Space Station) program provides a unique opportunity for ham radio operators to communicate with astronauts aboard the International Space Station (ISS). Periodically, the ISS conducts SSTV transmissions as part of ARISS events. During these events, astronauts capture images of Earth from space using special SSTV equipment onboard the ISS.
The SSTV images transmitted from the ISS are eagerly awaited by ham radio operators worldwide. They provide a rare glimpse of our planet as seen from space, showcasing stunning landscapes, coastlines, and weather patterns. Receiving SSTV images directly from the ISS is a thrilling experience for operators, strengthening their passion for ham radio and space exploration. Follow ARISS for a list events and frequencies.
Software Today
To decode and display SSTV images received over the airwaves, ham radio operators use specialized software. There are several popular SSTV software applications available, both free and commercial, that support different operating systems.
Some well-known SSTV software includes MMSSTV, QSSTV, and RX-SSTV*. These programs offer a user-friendly interface for processing audio signals and displaying received images. Additionally, they often support various SSTV modes and allow operators to adjust settings for optimal image quality and decoding performance. *RX-SSTV only receives images.
There is also a full list of Android and iPhone apps that send and receive SSTV images as well. With acoustic coupling (mic -> speaker / speaker -> mic) you can send decent images with little effort.
Slow Scan Television (SSTV) provides a captivating visual dimension to communication in amateur radio. Through SSTV, hams can transmit and receive images, fostering a sense of community and allowing for personal expression. The diverse modes, events, and awards associated with SSTV in ham radio make it an engaging and rewarding aspect of the hobby. Additionally, the opportunity to receive SSTV transmissions from the International Space Station adds a thrilling element, connecting operators to the wonders of space. As technology continues to evolve, SSTV remains an enduring and cherished part of the amateur radio landscape, connecting operators through the power of images over the airwaves, including those captured from the ISS.