How can the identification code be received before the wormhole is created?

Question

I started watching Stargate SG1 and I noticed something odd:
The Stargate starts spinning, they say incoming wormhole and right away after this they receive the identification code from SG1 to open the iris.

How can this code be received before the connection is created?

I looked it up, it at least happened in S01E08 Cold Lazarus. In the middle of the episode there is an offworld-activation, everyone is running into the control room and they have this conversation while the chevrons are still encoding:

• Sam: "Where's the iris?"
• Hammond: "Someone used a remote."
• Daniel: "But who? We're all here."
• Hammond: "Well, whoever it is has our codes."

And only during the last sentence you hear and see the wormhole opening. So clearly the signal was sent before the wormhole was opened.

Another occurance is right in the beginning of S02E08. You hear the Stargate activating, and there's this conversation:

• Woman: "Unscheduled incoming traveler."
• Hammond: "There's no one scheduled to return. Did you get an iris code?"
• Woman: "Yes Sir, we did. From SG-1."

Right after this you hear the wormhole opening.

Answer 1

The short answer is that these are foley/editing errors. Both are mentioned on the Stargate Wiki (under the goofs section). There is no in- or out-of universe explanation offered by the writers for these kinds of mistakes other than that these things do occasionally creep into a sci-fi series. If they ever remaster these episodes for future release, they'll probably be corrected.

http://stargate.wikia.com/wiki/Cold_Lazarus#

http://stargate.wikia.com/wiki/Family#

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When these sorts of things happen, it's best just to remember the MSt3K Mantra;

It's just a show; I should really just relax. (la la la).

Ultimately you need to recognise that the story is being told by a small production team that (due to the limitations of the medium) has to work quickly, with limited budget and tight deadlines.

Answer 2

Without written evidence to back this up, all we have is how the Stargates react to dialing. Dialing initiated from one gate powers the receiving gate, and causes it to start spinning, even before the worm hole is initiated. This indicates there is communication between the gates. From SGA and SGU, we know there is subspace communication, but we also know that the dialing gate provides the power to both gates.

That suggest that the kawoosh that you call the wormhole opening is just relative to our and the characters point of view. We know the event horizon of the stargate isn't really the event horizon of the worm hole, as the stargate has a digitizing buffer, so you can stick your hand in, and pull it back out, without a problem. So this all implies that the worm hole formed by the kawoosh is the portal for physical matter, not energy, to be able to get through. Before that is formed, there is still an active worm hole created that allows radio signals/energy to get through.

Remember, different types of matter/energy react differently though the worm hole. Matter is only allowed one way, while radio signals are bi-directional.

Answer 3

The gates establish a wormhole first, then simulate event horizons and beam travelers through the wormhole as energy so they do not spontaneously decompress in the vacuum of the wormhole. Radio signals are already energy and therefore do not require the simulated event horizons to travel through an active wormhole.

In either the season finale of season 1 or the season premier of season 2, or maybe both, we see a Goa'uld framastazzle (Long range visual communication device) interface with a stargate without simulating an event horizon. This demonstrates the stargates are capable of establishing a wormhole without simulating the event horizon, and frankly, I'm surprised Sam Carter never thought to use stargates in this manor to covertly send radio signals off world, or back to Earth. For instance, the original gas powered 6 wheel drive MALP would probably produce enough power to send messages through the gate. I'm actually surprised they never thought to install a portable DHD into a MALP, too.