3 ms·
It's worth noting that during the American civil war many telegraph operators used something called dot code, which consisted of clusters of 1-3 taps that corre
by tdeck 3y ago
It's worth noting that during the American civil war many telegraph operators used something called dot code, which consisted of clusters of 1-3 taps that corresponded to a contemporary flag signal code. That could certainly be transmitted through a wall. Likewise, you could probably slow down morse and transmit long pulses as clusters of 2 quick taps if you wanted to reuse that code on a wall.
- Johnythree 3y agoYou don't have to "slow down Morse". That is exactly how Morse is sent on a telegraph system.
- tdeck 3y agoThat's not entirely correct. As the article describes, landline Morse with a sounder has two distinct sounds for every code element, a different sounding click at the beginning and the end. A quick dit ("dot") is likely to resolve as a single sound to the listener, but it's actually two sounds. What I'm suggesting is to replace a dah ("dash") with two short dits when tapping out a message. But in order to do that, you need to increase the inter-element spacing so you can tell the difference between a dah and a pair of dits. That's what I meant by "slow down". For the same dit timing, the time required to send a message is longer, as you can see here: original --- . --- . --- --- . --- 2 dots . . . . . . . . . . . . . Note: The top line is based on the standard timing: - Each dit is one unit - Each dah is 3 units - Inter-element space is one unit - Inter-letter space is 3 units