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5

A7RW would be the call sign of a ham in Qatar, rather than the United States. The prefixes AA – AL are allocated to the United States. So AA7RW, AB7RW, AC7RW, etc. up to AL7RW would be valid US call signs. The FCC have certain call signs that they won't issue, like a call sign with a three-letter suffix starting with X (so I heard, can't find a source), ...


4

There are lots of proprietary codecs used in amateur radio. They are allowed in most countries for amateur use simply because they have not been made illegal. But I don't think that's what you're asking. I think most of us would agree that proprietary codecs are generally against the spirit of amateur radio; we prefer open protocols that anyone can use, ...


9

The requirement on the FCC side of this is that transmissions may not be encrypted in order to hide their content. In the case of C4FM (or the other protocol mentioned in another answer, DMR, or as well in JT8/JT4) anyone can either obtain software or buy a device that supports these protocols and listen to the transmission. There would only be a violation ...


2

There is a legal corner of StackExchange, but the basic answer you seek is not very complicated. I am not a lawyer, but I am the inventor of a number of patented ideas, so I have experience in this area. DMR is another proprietary CODEC used by hams, so C4FM is not unique. "Proprietary" in this context simply means that it embodies intellectual ...


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