HERB KEATON N2GEW
I don't know if your experience with the Tigertronics jumper block will be the same as mine but I have checked
both the 6-pin DIN cable and the 8-pin DIN cable and the optional "pre-wired" blocks that Tigertronics sells
as options for the SignaLink USB.
In both cases, those blocks work inserted "opposite" from the markings on the block receiver.
There is a "notch" etched into both the block and the receiver and I noted those at opposite
ends in order complete the correct circuit.
Seems like quite a coincidence but confirmed.
N2GEW / herbk@...