[Amps] SB-200 QSK mod info

Paul Christensen w9ac at arrl.net
Wed Mar 27 09:37:09 EDT 2013


> From past measurements, transceivers like the Icom 7700/7800, and K3 all 
> supply RF > 9 ms after amp key line closure.

That should have read "...supply RF > 9 ms after the transceiver's *input* 
key line closure."  The time delay between RF output and the *amp* key line 
on these three transceivers measures between 6-8 ms.  Still, Vasily's 
measured switch times are well more than fast enough even if the timing 
sequence is not optimum.  Just to be clear, this is not a fault of the W7RY 
board, but is due to each relay's inherent electromechanical delay.

Paul, W9AC 



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