[Elecraft] Antenna comparisons, WSPRnet and timed serial port macros

[drewko]

I've been doing some performance comparison between two antennas I am
using. I'm compiling data of my WSPR transmissions and spots over
periods of many hours. I got a little carried away and made up a
spreadsheet  to compare reciprocal signal reports as well as the
performance differences between my two antennas...

Basically, I am manually switching from one antenna to the other on a
reqular basis, keeping track of which time periods each is in use.
What I'd like to do is automate the antenna switching on my K3 at
periodic intervals. 

The question is, what is the simplest solution for achieving this?
Don't really want to install some full-blown logging-control software.
I am wondering if there is perhaps some little generic utility
available that will send user specified commands over the serial port
at specified intervals. Is there anything like that available? (Years
ago there was a great telecom program called COMMO that could do
this.)

73,
Drew
AF2Z