This thread is out of date, continue discussion in the sticked thread in this subforum.
Notes before you start speculating/reading:
:siren:THE BABEL SITE IS NOT AN OFFICIAL SOURCE, DON'T REFER TO IT. It is fan made:siren:
:siren:aperturescience.com HASN'T BEEN UPDATED SINCE '07, STOP USING IT!:siren:
:siren:Do not call the BBS numbers. All your doing is slowing the people who can actually connect to it down. So stop it.:siren:
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Okay so as we know or should know today valve released a sneaky update that added radio transmissions to the original Portal radios. The radios only appear after you've completed the campaign and have the heartbreaker achievement.
You can see it here :

Well there are 26 total radio transmissions codenamed "Dinosaur"
FP has been at work decoding these sounds as much as they could. We've learned that you must decode them using SSTV, a program used to turn sounds into images.
So far we have these :
ThisIsPain has translated the morse codes from Dinosaur 1, 5, 12, and 17.
Morse codes:
Dinosaur1: INTERIOR TRANSMISSION ACTIVE EXTERNAL DATA LINE ACTIVE MESSAGE DIGEST ACTIVE
Dinosaur5: 9E107D9D372BB6826BD81D3542A419D6
Dinosaur12: SYSTEM DATA DUMP ACTIVE USER BACKUP ACTIVE PASSWORD BACKUP ACTIVE
Dinosaur17: BEEP BEEEEP BEEP BEEP BEEEEP BEEEEP BEEEEP BEEP BEEEEP BEEP BEEP
Becomes .-.. --- .-.. Or...."LOL"
Images converted from sound by using SSTV :siren:Updated As Of 3/2/10 at 9:31 PM EST for reason : Higher Quality:siren:
dinosaur2

dinosaur3

dinosaur4

dinosaur6

dinosaur7

dinosaur8

dinosaur9

dinosaur10

dinosaur11

dinosaur13

dinosaur14

dinosaur15

dinosaur16

dinosaur18

dinosaur19

dinosaur20

dinosaur21

dinosaur22

dinosaur23

dinosaur24

dinosaur25

dinosaur26

On number 3 and 10 is a string of numbers, a BBS code. Or a phone number. Here, our fellow FP'er lilcheeselad has searched the phone number decoded by ZPR23 from steam forums
zpr23 posted:
From images: 9459C6CAC8C203B8128B7CC63068D4FD
Translates to BBS#: (425) 822-5251
425 is a Seattle area code.
Calling resulted in what sounded like a modem.
Someone translate that!
I'll update the OP when something new is discovered
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:siren:Update: 3/2/10 9:22 PM EST
The BBS was updated as it went back up today. We managed to snag a few images. See them below :
Update: 3/2/10 6:27 PM EST
shakadamus has found a nice colored version of the picture below. For comparison purposes both will be kept in the OP. You can see it here (Note : Updated old image) :

Update: 3/2/10 4:08 PM EST
Hooded sniper has cleaned up the infamous sound clip retrieved from calling the BBS code.
Much higher quality of the infamous clip with Thats Amazing in it, also listen around at 18 to the end, either alyx or judith is talking.
Update : 3/2/10 2:00 PM EST
People have been connecting to the phone number above with a modem and received results, here are the images compiled together:

Update: 3/1/10
ThisIsPain has translated the morse codes from Dinosaur 1, 5, 12, and 17.
Morse codes:
Dinosaur1: INTERIOR TRANSMISSION ACTIVE EXTERNAL DATA LINE ACTIVE MESSAGE DIGEST ACTIVE
Dinosaur5: 9E107D9D372BB6826BD81D3542A419D6
Dinosaur12: SYSTEM DATA DUMP ACTIVE USER BACKUP ACTIVE PASSWORD BACKUP ACTIVE
Dinosaur17: BEEP BEEEEP BEEP BEEP BEEEEP BEEEEP BEEEEP BEEP BEEEEP BEEP BEEP
Becomes .-.. --- .-.. Or...."LOL"