The new FST4 mode has almost completely superseded JT9 on 630 and 2200m,
the only remaining JT9 signals being from those that missed the
announcement / release or are waiting on a general availability
release. The advantages over JT9 are numerous, including use of 'a
priori' (as used with FT8, etc.), and a user adjustable noise blanker
that many have found indispensable on LF/MF. While part of the beta
test group, we did a fair amount of testing on 160m as well.
Joe posted this graph comparing JT9 vs. FST4 performance:
https://physics.princeton.edu/pulsar/k1jt/jt9_vs_fst4.pdf
- Eric NO3M
On 10/9/20 5:44 PM, Jim Brown wrote:
I'd love to see Topbanders using JT9, which provides another 4 dB of
noise rejection. JT9 dominates on 630M for that reason.
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