[Elecraft] K2 + SignalLink: Setting gains for digital modes

[Bill Coleman]

On Apr 14, 2013, at 12:25 PM, Chris Kimball <mail at cvkimball.com> wrote:

> I operate digital modes with the K2/KPA with a SignalLink computer interface. 
> The SignalLink drives the microphone input to the K2.  The K2 has
> compression turned off (1:1) and a mike gain of 3.  The SignalLink computer
> interface is at 100% gains on both sides and the SignalLink has the default
> internal gain jumpers.
> 
> I get occasional comments that I'm splattering, a very serious concern. 
> Unfortunately I lack instrumentation to study the problem.

You have to adjust the gain as you change bands. Unfortunately the K2 gain profile varies wildly from band to band. Either adjust until you just barely get any ALC indication, or adjust until you just barely get the requested power out.

>  How should I set the audio (SignalLink) drive gain and the RF (K2 Power)
> drive? My normal operation is not smoke-producing, so this is not a
> duty-cycle question.

Set the K2 power level at whatever power you desire. Then increase the audio level until you just barely make that power level. You should be pretty close to just barely having ALC action.

When you change bands, do it again.

Bill Coleman, AA4LR, PP-ASEL        Mail: aa4lr at arrl.net
Web: http://boringhamradiopart.blogspot.com
Quote: "Not within a thousand years will man ever fly!"
           -- Wilbur Wright, 1901