Hi Roelof,

...
On an other note, I have made a 4 hour PERSEUS recording and should
like to make some signal strength plots like yours. Is there a
suitable program available to do so. I am using Windows 7.
...
There is a lot more to look at, but I gather a decent graphic
program will make things much more clear.
...

See: http://sourceforge.net/projects/qtgrace/

I'm using XMgrace on unix/linux workstation since 15
years. QTgrace is based on the same grace-core. And
it's open source. On my servers I'm using DISLIN from
MPI for Solar System Research as a "headless" library:
https://www.mps.mpg.de/dislin/

73 de df3lp,
Peter