[Elecraft] Serial Port on K3

[Jim Rhodes]

Actually you don't know if the problem is with the rig or the serial port
on the computer. One or the other is out of spec as IIRC an rs232 port
should respond at +/- 9 volts. If you have a scope handy you might sniff
out the signal voltages on the data lines and see what the swing is.

Jim K0XU Sent from my Xoom tablet
On Feb 27, 2012 11:04 PM, <N4CW at aol.com> wrote:

> Saturday, I was preparing my mobile station for the NCQP on Sunday. I was
> using external power
> to my K3 from a fully charged AGM battery. Running 50 watts into a good
> antenna, everything seemed
> okay; I made a lengthy 40M CW contact and next hooked up my laptop for
> logging. That's where I ran
> into trouble. I use N1MM Logger (ver 12.2.2), the serial port for rig
> control, and the parallel port for
> keying. However, I couldn't get the frequency to display, yet I could key
> the rig using N1MM. To make
> a long story short, I found that (using the K3's metering), my supply
> voltage was 12.3 volts. I substituted an AC supply (receive mode only
> because my
>  inverter/converter was only rated for 75 watts!!!) that puts out 13.8 VDC,
> and  VOILA! I got my frequency displayed.
>
> I didn't have time to figure out a solution, so I wound up operating
> without rig control...single band, "rover"
> class, CW only, and would type in my run frequency to set the logger.
>
> So, is the K3 serial port supposed to crap out when the rig's voltage
> supply isn't optimum?
>
> Bert, N4CW
>
>
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