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Dutch radio amateurs image far side of the Moon using Chinese satellite data

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Re: Dutch radio amateurs image far side of the Moon using Chinese satellite data

#61

Post by syntaxing » Wed, Feb 06, 2019, 7:30 PM UTC

howard941 wrote: post #57

syntaxing wrote: post #42

So interesting! How do you send "error-resistant digitally modulated transmissions"? Is that the same thing as a duplex signal? Is there other technology used nowadays?

Could be coding (Turbo coding is where it's at, while hamming (no relation) error correcting codes are purely digital and ubiquitous), could be simple double transmissions separated in the time domain as in FEC SITOR/AMTOR. My money's on Turbo coding. https://en.wikipedia.org/wiki/Turbo_code

Super interesting! Is this still the standard for this sort of communication nowadays or are there successors?

Re: Dutch radio amateurs image far side of the Moon using Chinese satellite data

#62

Post by TheSpiceIsLife » Wed, Feb 06, 2019, 9:42 PM UTC

Tor3 wrote: post #29

TheSpiceIsLife wrote: post #28

Earlier quoted context omitted.

I recently learn, and therefore want to tell everyone , the ham in Ham radio isn’t an acronym. It means ham as in ham fisted , as in amateurish or unskilled . See the Wikipedia entry for more info https://en.wikipedia.org/wiki/Amateur_radio

As per the linked wikipedia article.. it used to mean that (as a pejorative term coming from professional wired telegraphy in the 19th century). From the article " .. by the mid-20th century it had lost its pejorative meaning. " But yes, it's not an acronym.

It can still mean ham as in ham fisted while not being pejorative.

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