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Java in the browser ("Java Applets") have been deprecated since at least 2009, and since latest 2017, no browser supports them anymore (and that's not something that was disabled. The interfaces for t …

Is it correct to say that with digital modes, that is impractical, and you should just listen (over the bandwidth you plan to use) and if you hear nothing, just go? Well, that really depends; "liste …

Carson's rule doesn't apply to (low-order) FSK; it makes a statement about frequency-modulated continuous-spectrum signals, not about signals that jump (pulse-shaped) between a small set of frequencie …

Yes, it's possible. The physics and the math don't care what the legal assignment of some RF band is - so you can do any working modulation method on a ham band. Nothing is special about ham bands.

Table of contents But what exactly generally is a Gold code? How exactly are they implemented in order to differentiate multiple signals on the same frequency? What Gold Codes are and aren't How th …

There's large AIS observer networks (think MaritimeTraffic.com and consorts), and chances are that Edinburgh station just feeds data from the internet into the system. Furthermore, theres official and …

You're asking exactly the right question – my receiver can't know this property of the transmission, how do I figure it out reliably – and that way of thinking makes for good receiver designs :) There …

That was just added by someone who's primary language probably isn't English. What they meant to say is "QPSK31, a mode that is related to PSK31, uses..." Other than that, the claim "it uses more cons …

What SNR should I expect? Wrong question! You need to ask yourself: What's the SNR I need to still achieve my desired performance. "Desired performance" here is How much data do I need to tran …

It seems that FreeDV encodes the input audio signal in both the frequency and time domains, which means that the output signal amplitude doesn't follow the input signal amplitude, but rather the ou …

You're confusing the transceiver implementation with mode as is. Every single mode, as long as it's not used to transported to transport graphics, can be operated without a GUI. Whether or not an im …

Complexity of your question It's hard to make general statements here, because computational complexity is a property of the implementation of a receiver, which usually is a choice given the propertie …

Fully agreeing with Brian! Just to answer your formal question: From a strict definition (what is it?), is Morse code (CW) a binary mode? and, from your title, Is Morse code a digital, bin …

Yes, that's mathematically and technologically possible. Because Mike already said the latter, let me elaborate on the math side: Remember that SSB is really just AM, with one half of the transmit sp …

I know there's actually people working on a system for that band. It'll be SDR-based. There's no technical restriction that says you can't have a couple hundred kilobits per second in a couple hundre …