Hi,
> So how does it work "off-air"? I'll need a shielded cable and attach it
> on to the antenna pads of the handset?
You need to use a RF 50 ohm coax cable. The Racal has a N connector and the phone should have one has well. I don't remember the exact reference of the C123 connector but I know digikey has adapter to SMA for it, so I use a N to SMA then an adaptor that depends on the phone.
Sylvain