What are trade-offs between special purpose scan converters and PC-based systems?
Dedicated scan converters offer some advantages: You plug in the cables, turn on the power, and they work. You don’t need a computer. They are expensive. Most people with scan converters use a computer anyhow, to store images, so why not use a low cost interface and let the computer do most of the work? This is also more flexible, new features are distributed by floppy disk instead of hardware changes. There are two major disadvantages. First, none of the current systems allow you to run SSTV concurrently with other applications. Second, there are occasional conflicts or incompatibilities when adding new hardware and software to a computer system. Although the single op-amp receive interface is popular due to its extremely low cost, results aren’t that good under noisy conditions. Those who have run other systems, such as VGA TV, side-by-side with the cheap interfaces consistently report that the systems with more filtering and hardware demodulation perform much better with poor signal
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