On Sat, Oct 20, 2018 at 11:48 AM Jim Garland <4cx250b@miamioh.edu> wrote:
> The other mode is "full break-in" which routes the keying line through the
> amplifier's QSK-IN and QSK-OUT jacks before it reaches the transceiver. In
> this mode, the amplifier is ready to receive RF before the transceiver
> begins to transmit. In both modes, however, the amplifier will not key up
> if RF is prematurely present at its input, and all internal amplifier relay
> and bias sequencing is done properly.
>
Sounds good, but it does force you to use an external keyer for QSK instead
of the keyer built into the radio. It also won't work with
computer-generated CW keying conveniently sent over a rig's "CAT" port
(CONFIG:PTT-KEY option in K3; similar "USB KEYING (CW)" option available in
newer Icom rigs).
The "Sametime" keying circuit
<https://www.kkn.net/~n6tv/S-BOX/Features.html#SametimeKeying> of the S-BOX
or S-BOX-USB can key an amp's relay and the rig's KEY input at the same
time. This works great for computer-generated CW over a serial or USB
port, but still doesn't work with the internal keyer of the radio.
73,
Bob, N6TV
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