[Amps] SB-200 QSK mod info

[k3it]

Paul,

I was surprised that the vacuum relay closed in just over 1ms, much better
than the 6ms specification.   I agree there is no problem for most rigs.
One exception is when the amp is controlled by a foot switch.  In this case
it's possible to have RF at the output relay too early.   I may be guilty
of doing this with an old Icom that had a broken PTT relay.

Some beautiful work on your QRZ page!   It would be fun to add
microprocessor control to an old Heathkit amp.

Vasiliy

On Wed, Mar 27, 2013 at 9:37 AM, Paul Christensen <w9ac at arrl.net> wrote:

> 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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