The circuit diagram above is quite low resolution and difficult to read, if there is any chance of a higher resolution one?
I've seen the annotated photo, also noted not to attempt to open the housing, and the warning about the -5V.
I'm guessing the connection board from SP1GQC is the one referred to in the eBay.pl listing as being developed?
In which case, perhaps there will also be an eBay listing to order one!
73 Steve G4KNZ.