[Elecraft] K2/100 High Refl shutdown driving amp

Tue Oct 28 10:29:01 2003

Forgot to mention - T-R delay is currently set to .45 seconds.

K8AC
----- Original Message ----- 
From: "Floyd Sense" <[email protected]>
To: "Elecraft" <[email protected]>
Sent: Tuesday, October 28, 2003 9:18 AM
Subject: [Elecraft] K2/100 High Refl shutdown driving amp

> The K2 is sn#1987 with Rev B changes, latest firmware.  I recently built
the
> KPA100 and have been testing the setup while chasing DX with the AL-800H
> amplifier.  The 8R Hold feature is being used, and I can drive the amp to
> full legal output with 50-60 watts from the K2.  Over 6-8 hours of
> operation, I've had one situation occur three times now.  If I pause just
a
> bit too long between characters on CW, the amplifier relay drops out and
the
> problem occurs when the next character is sent.  The problem is a High
> Reflected power message, and complete loss of output power from the K2.  I
> suspect that the problem originates when the K2 output rises during the
> amplifier relay drop and reactivation, presenting the K2 with a momentary
> high SWR situation.
>
> When this occurs, there is NO output from the K2, and the only recovery is
> to run the K2 power control down to zero and then to reset it to the
proper
> value, or to power the K2 down and up again.  If I'm running with the
> headphones on and can't hear the amplifier, there's really no way to know
> that there was a problem as there's no audible difference in the K2, and
the
> High Refl message on the display disappears very quickly.  Has anyone else
> noted this problem, or have any suggestions?
>
> K8AC
>
>
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