As best I can tell, the Barrett 4050 uses digital signal processing only
on the receive end. Instead, modes like FT8 and FT4 use various forward
error correction techniques to pre-encode the transmitted signal. The
receive side then knows what to look for, and processes the received
signal using other techniques to get the superior signal to noise ratio
performance.
You need to have the processing on both ends of the path in order to
maximize the benefits, but that could be done mostly transparently to
the user if done properly.
73,
Dave AB7E
On 7/3/2021 2:25 PM, Henry Pollock - K4TMC wrote:
As a 69-year-old phone contester with limited time to devote to researching
all of the other aspects of the ever-changing ham radio hobby, I was
intrigued by the possibility of using the weak signal capabilities of FT8
to convert data to audible CW and voice.
About the same time this subject was being discussed here, I came across
another tidbit on a totally non-contest group about the Barrett 4050 which
uses a digital system to enhance HF weak signal voice communications. The
YouTube video example was very impressive. I now wonder if the Barrett
digital system is using something like FT8.
So, I am happy that this discussion has continued here.
73,
Henry - K4TMC
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