Gary,
As Damien suggests (that's what I current have set-up)
Connect the observatory PC to the Cat6 cable
Run the cable (with or without the sacrificial youngster) from the observatory to the home office and connect it to one of the cable network ports on the WIFI modem.
The observatory PC with then appear as a WIFI connected PC.
This means you can then use any home device connected to the WIFI to connect to the observatory PC.
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