For what it's worth ....
My TS-930 (which produces fairly good QSK barefoot) asserts a PTT signal 2
ms before the first RF. No way that's slow enough to protect my SB-220.
Last fall in CQWWCW, I used a TRLog setting of 20 (34 ms leadtime). For
the first time in years, I didn't have the amp apart during the contest to
burnish the TR relay contacts.
One of the projects on my list is to replace the input and output relays on
the SB-220 with fast ones. Even then, I probably won't attempt QRO QSK
during a major contest, because it wouldn't take very long to exceed the
maximum expected life (in switching cycles) of the replacement relays.
So I bless TRLog for having the programmable PTT function, even if it HAS
allowed me to procrastinate on the relay change.
73, Pete Smith N4ZR
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