[K2] K6XX zero beat indicator and the "Spot" function

Posted by Chris Kimball on Jul 01, 2011; 2:52pm
URL: http://elecraft.85.s1.nabble.com/K2-K6XX-zero-beat-indicator-and-the-Spot-function-tp6538059.html



Thanks for all that have responded.

I've installed a 100 K series resistor in the audio input as suggested.  
The problem continues, however.

In messing around with the unit, I attached an EZhook cliplead to the
audio input at the board-connector.  The cliplead is attached to a wire
about 1 ft long with another EZhook at the end.  Nothing is attached to
the other end, however.  When this is done, the indicator works
correctly, with no-signal responses to very few noise bursts and correct
operation on signals, at full RF gain.

The cliplead seems to be injecting noise into the audio line.  If the
other end is connected to a 1 M resistor to ground, the needless
blinking resumes.

This suggests that the K6XX board may be defective. Further ideas would
be appreciated.

Chris Kimball
WB4WZR
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