Topband: Good Conditions, Little Activity

[Eric NO3M]

The new FST4 mode has almost completely superseded JT9 on 630 and 2200m, 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.
>