[Elecraft] K3 Tx audio ramp up with DATA-A mode

[Edward R. Cole]

Just providing some information that may help others that have 
experienced RF slow ramp up to full power when driving Tx audio from 
a soundcard (typ DATA-A application).  I

I had comments back at the time I asked for solutions to check for 
low audio level.  But it was the opposite, in fact!

I am using an external emu0202 soundcard (I/F to computer vis USB2.0) 
which has plenty of level controls for a sound input but none for 
output via the stereo phone jacks.  Going into the operating sw for 
the soundcard reveals no adjustment of the output audio (usually 
called playback).  I found reference to making adjustments as part of 
installation of the sw - but none after installation - huh?

Well not wanting to go thru all the process of un-installing then 
re-installinng I looked for an alternative.  There was one starring 
me in the face on the front panel.  There is a headphone jack with 
level control (volume) as part of the on-off control.  I unplugged my 
Tx audio line from the jack at the rear and into the headphone jack 
and adjusted the TX audio to 4-bar with 5th flickering.

I could not accomplish this using the mic level control on the K3 
(which doubles as line-in level).  Setting the mic=0 results in no 
audio; setting the mic=1 and it was overloading the K3.  The 
soundcard output was just too hot.  Using the headphone jack with 
headphone level control lets me set it just right.

Result.  First time I sent test tones form the sw the K3 went thru 
the gradual RF ramp up.  Next time I tried it K3 immediately went to 
full power with no ramp up...problem solved!


73, Ed - KL7UW, WD2XSH/45
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