Re: SSTV NBTV ?
Posted: Thu Oct 25, 2018 3:07 pm
...and afterthought...
I have some FTDI USB-TTL/RS232/422/485 'cables...
https://www.ftdichip.com/Products/Cables.htm
...they unfortunately cost a bit more than one dollar!
These go up to 3Mb/s, including start/stop bits that's 300kB/s. Two bytes/sample = 150k-samples/s, a bandwidth of 75kHz. Add your own DC-coupled A-D/D-A and you're in business...for NBTV you probably want to put in an anti-aliasing filter at about 20 or so kHz.
I'm sure there's software 'out there' that will dump the data into a file and spit it out again, or some clever bod to create some. Even Hyperterminal or RealTerm should handle it.
Steve A.
I've just remembered, Hyperterminal doesn't like values like 0x19 that are control codes in ASCII, RealTerm has no issue as long as you specify it's a binary file, not text. I'm sure there are others, maybe TerraTerm? All three are freebies...
I have some FTDI USB-TTL/RS232/422/485 'cables...
https://www.ftdichip.com/Products/Cables.htm
...they unfortunately cost a bit more than one dollar!
These go up to 3Mb/s, including start/stop bits that's 300kB/s. Two bytes/sample = 150k-samples/s, a bandwidth of 75kHz. Add your own DC-coupled A-D/D-A and you're in business...for NBTV you probably want to put in an anti-aliasing filter at about 20 or so kHz.
I'm sure there's software 'out there' that will dump the data into a file and spit it out again, or some clever bod to create some. Even Hyperterminal or RealTerm should handle it.
Steve A.
I've just remembered, Hyperterminal doesn't like values like 0x19 that are control codes in ASCII, RealTerm has no issue as long as you specify it's a binary file, not text. I'm sure there are others, maybe TerraTerm? All three are freebies...