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
======================================
BP40IQ 500 KHz - 10-GHz www.kl7uw.com
EME: 50-1.1kw?, 144-1.4kw, 432-QRT, 1296-?, 3400-?
DUBUS Magazine USA Rep
[hidden email]
"Kits made by KL7UW"
http://www.kl7uw.com/kits.htm======================================
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