[tracker2] Tactical Callsigns and T2-135

[nj2e]

I am trying use the "HFEST-18J" tactical call sign to announce our
hamfest on RF, using my DR-135 and T2-135. When I attempt to write
to the T2, I get "Invalid callsign" error. I put my callsign in the 
text box for proper identification. So can I write a tactical call to
a T2-135 or not? In advance thanks for the replies. 73s Don NJ2E