There is a really nice spectrum analyzer out there written by Colin Campbell called: Spectrum Analyzer GM. It's was written for the Icom PCR-1000, and some other radios, but I found it works just fine with the PCR-100 also! Best part is, it's FREE, and can be downloaded here:
blueyonder Webmail
Screen Print:
This link no longer works and really need this software. Does anyone have it who is willing to share or post somewhere for download? Thanks.