Hi Ed,

The KX3 specification rates the key line at: "Accessory I/O (ACC2 Jack)
KEYLINE: 30 V, 100 mA max, open drain;" on page 54.

The amplifier should also have a specification. As long as the amp is
under 30V and 100 ma, all will be OK with a direct connection. If the
amp does not have a specification, amp key input measurements can be
performed with a voltmeter and an amp-meter.

John KN5L

On 03/12/2018 10:30 AM, Eddy Avila wrote:
> Greetings, can anyone suggest how to connect a KX3 to a non-Elecraft amp
> keying circuit? I'm thinking I should use a small reed relay to do the
> keying. The amp uses the typical grounding a pin on the amp to key up
> amplifier.
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