Jim Im just curious
using the mic input is a problem because of noise presumably because
you have to set the levels way to low so that the line output of the
K3 doesn't swamp the mic input and by this you drastically narrow the
dynamic range. would building some sort of attenuator at the mic
input help in a pinch? I know that having a good external usb device
with line level inputs is ideal but sometimes thats not so handy when
setting up field day and you forgot the good card or need many for all
the stations and doing it on a budget?
As for freeing up the serial port I use Virtual serial port emulator
as a data splitter to one serial port for multiple applications.
Its fast enough that using RTS and DTR for ptt and keying CW and it
works fine without timing issues even when multiple programs are
watching the same port.
well at least up to about 30WPM and probably well beyond but my
brain wont go faster than that for CW
David Moes
VE3DVY
On Wednesday 12/11/2014 at 2:00 pm, Jim Brown wrote:
On Wed,11/12/2014 10:06 AM, RIchard Williams via Elecraft wrote:
All I did was connect the line out on the K3 to the mic in on the
computer (using a stereo cable) and the line in on the K3 to the
headphone jack on the computer.
Yes, it works. The headphone out to the K3 is good enough for all ham
uses. The mic input is NOT good enough -- as has been noted, mic
inputs
tend to be very noisy, so they don't allow decoding of weaker signals.
The difference can easily be 10 dB (10x the power). THAT'S why anyone
serious about digital modes needs a dedicated USB I/O box. See the
link
I posted yesterday for recommendations of specific products. Or go to
k9yc.com/publish.htm
Only thing missing was a way to key the K3. This is easily solved by
using the RS-232 port on the K3;
It's also easily solved by using VOX, which doesn't tie up a serial
port. Just pay attention to Don Wilhelm's advice.
73, Jim K9YC
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