Question: Since the DHD on the Antarctica gate would still have to have the symbol for Earth as the point of origin, why couldn't they just take that DHD and attach it to the gate in SGC it would make dialing out faster and they could beat a Goa'uld attack by dialing out faster than the Goa'uld could dial in.

Stargate SG-1 (1997)
1 question in Solitudes
Revelations - S5-E22
Revealing mistake: Just before Teal'c and O'Neill get to the engine room door, Carter can be seen hiding around the corner. (00:27:40)
Coombs: I knew I should have updated my will before agreeing to off-world assignments.
Felger: You are not going to die, Coombs.
Coombs: Oh, come on, Felger. We might as well be wearing red shirts.
Felger: I don't get that.
Trivia: Dom DeLuise and his three sons Peter DeLuise (who has written, directed and produced a number of episodes), Michael DeLuise and David DeLuise have all appeared on the show at least once. Peter DeLuise has appeared many times.
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Answer: In "48 Hours", it was revealed that the Antarctic gate stopped working shortly after it was discovered. As one of the oldest DHDs in the galaxy, it simply ran out of power. Also note that the Antarctic gate and the Giza gate have different symbols for their points of origin, so their DHDs might not have been interchangable, anyway.