[Elecraft] Isolating the KPA100 External Keying Line

[Roy Morris]

When keying my Alpha 99 via a shielded cable from the KPA100 J7 jack, there is a small amount of stray RF getting into the SSB signal.  This RF is not present when the amp is used with either my 756 PRO2 or 706MK2G, and it is not present when using the K2 at 100 watts barefooted regardless of band or mode.  The PA keying lines for the Icom rigs use external reed relays which isolate the keying lines from the amp.  The Icom rigs produce a transmit voltage to activate the reed relays.  The stray RF might be eliminated from the K2 if an external reed relay could be used in the keying line.  I do not see a transmit voltage available to accomplish this.  Any thoughts on how to isolate the keying line would be appreciated.  Thanks.  Roy Morris  W4WFB  
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