It appears that the Tiny2 TNC is broken at G0ROZ-3. The lights are flashing to show that it is transmitting and receiving, but nothing is getting to the COM port.
I do not have a spare TNC at Eggardon, so I have had to come back to base to dig another TNC out of the supply cupboard and set it up.
I expect it will be tomorrow (Friday) before I go back and replace the TNC